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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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// INITIALIZATION
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this.refreshPageForChanges = false;
this.showRefreshNotifications = true;
// view controls
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this.lastModifiedLabel = null;
this.supportsPopState = false; // window.history.pushState!=null;
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this.refreshInterval = null;
this.refreshContent = null;
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self.collectViews();
self.collectOverlays();
self.collectMediaQueries();
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self.setViewVariables(view);
self.centerView(view);
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window.addEventListener("keyup", self.keypressHandler);
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self.syncronizeViewToURL();
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if (self.refreshPageForChanges) {
self.setupRefreshForChanges();
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self.viewScale = self.scaleViewToFit(view);
if (self.viewScale<0) {
setTimeout(self.scaleViewToFit, 500, view);
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self.viewScale = self.getViewScaleValue(view);
self.centerView(view);
self.updateSliderValue(self.viewScale);
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else {
// no view found
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if (self.showUpdateNotification) {
self.showNotification();
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//"addEventListener" in window ? null : window.addEventListener = window.attachEvent;
//"addEventListener" in document ? null : document.addEventListener = document.attachEvent;
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// AUTO REFRESH
///////////////////////////////////////
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// get document start values immediately
self.requestRefreshUpdate();
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* Attempt to check the last modified date by the headers
* or the last modified property from the byte array (experimental)
**/
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var url = document.location.href;
var protocol = window.location.protocol;
var method;
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if (self.refreshCheckContentSize) {
self.refreshRequest.open('HEAD', url, true);
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else if (self.refreshCheckContent) {
self.refreshContent = document.documentElement.outerHTML;
self.refreshRequest.open('GET', url, true);
self.refreshRequest.responseType = "text";
}
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// File system does not send headers in FF so get blob if possible
if (protocol=="file:") {
self.refreshRequest.open("GET", url, true);
self.refreshRequest.responseType = "blob";
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else {
self.refreshRequest.open("HEAD", url, true);
self.refreshRequest.responseType = "blob";
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self.refreshRequest.onload = self.refreshOnLoadOnceHandler;
// In some browsers (Chrome & Safari) this error occurs at send:
//
// Chrome - Access to XMLHttpRequest at 'file:///index.html' from origin 'null'
// has been blocked by CORS policy:
// Cross origin requests are only supported for protocol schemes:
// http, data, chrome, chrome-extension, https.
//
// Safari - XMLHttpRequest cannot load file:///Users/user/Public/index.html. Cross origin requests are only supported for HTTP.
//
// Solution is to run a local server, set local permissions or test in another browser
self.refreshRequest.send(null);
// In MS browsers the following behavior occurs possibly due to an AJAX call to check last modified date:
//
// DOM7011: The code on this page disabled back and forward caching.
// In Brave (Chrome) error when on the server
// index.js:221 HEAD https://www.example.com/ net::ERR_INSUFFICIENT_RESOURCES
// self.refreshRequest.send(null);
}
else {
self.refreshRequest = new XMLHttpRequest();
self.refreshRequest.onreadystatechange = self.refreshHandler;
self.refreshRequest.ontimeout = function() {
self.log("Couldn't find page to check for updates");
}
var method;
if (protocol=="file:") {
method = "GET";
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else {
method = "HEAD";
}
//refreshRequest.open('HEAD', url, true);
self.refreshRequest.open(method, url, true);
self.refreshRequest.responseType = "blob";
self.refreshRequest.send(null);
}
}
}
catch (error) {
self.log("Refresh failed for the following reason:")
self.log(error);
}
}
self.refreshHandler = function() {
var contentSize;
try {
if (self.refreshRequest.readyState === XMLHttpRequest.DONE) {
if (self.refreshRequest.status === 2 ||
self.refreshRequest.status === 200) {
var pageChanged = false;
self.updateLastModifiedLabel();
if (self.refreshCheckContentSize) {
var lastModifiedHeader = self.refreshRequest.getResponseHeader("Last-Modified");
contentSize = self.refreshRequest.getResponseHeader("Content-Length");
//lastModifiedDate = refreshRequest.getResponseHeader("Last-Modified");
var headers = self.refreshRequest.getAllResponseHeaders();
var hasContentHeader = headers.indexOf("Content-Length")!=-1;
if (hasContentHeader) {
contentSize = self.refreshRequest.getResponseHeader("Content-Length");
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self.refreshContentSize = contentSize;
// exit and let interval call this method again
return;
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else if (self.refreshCheckContent) {
if (self.refreshRequest.responseText!=self.refreshContent) {
pageChanged = true;
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else {
lastModifiedHeader = self.getLastModified(self.refreshRequest);
if (self.lastModifiedDate!=lastModifiedHeader) {
self.log("lastModifiedDate:" + self.lastModifiedDate + ",lastModifiedHeader:" +lastModifiedHeader);
pageChanged = true;
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if (pageChanged) {
clearInterval(self.refreshInterval);
self.refreshUpdatedPage();
return;
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else {
self.log('There was a problem with the request.');
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catch( error ) {
//console.log('Caught Exception: ' + error);
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self.refreshInterval = setInterval(self.requestRefreshUpdate, self.refreshDuration);
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else {
self.log("Could not get last modified date from the server");
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var date = new Date().setTime((new Date().getTime()+10000));
document.cookie = encodeURIComponent(self.pageRefreshedName) + "=true" + "; max-age=6000;" + " path=/";
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document.location.reload(true);
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self.showNotification = function(duration) {
var notificationID = self.pageRefreshedName+"ID";
var notification = document.getElementById(notificationID);
if (duration==null) duration = 4000;
if (notification!=null) {return;}
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notification.id = notificationID;
notification.textContent = "PAGE UPDATED";
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notification.setAttribute("style", styleRule);
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notification.addEventListener("click", function() {
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setTimeout(function() {
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notification.style.filter = "drop-shadow( 0px 0px 0px rgba(0,0,0, .5))";
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}, duration);
document.cookie = encodeURIComponent(self.pageRefreshedName) + "=; max-age=1; path=/";
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* Get the last modified date from the header
* or file object after request has been received
**/
self.getLastModified = function(request) {
var date;
// file protocol - FILE object with last modified property
if (request.response && request.response.lastModified) {
date = request.response.lastModified;
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// http protocol - check headers
if (date==null) {
date = request.getResponseHeader("Last-Modified");
}
return date;
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self.updateLastModifiedLabel = function() {
var labelValue = "";
if (self.lastModifiedLabel==null) {
self.lastModifiedLabel = document.getElementById("LastModifiedLabel");
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if (self.lastModifiedLabel) {
var seconds = parseInt(((new Date().getTime() - Date.parse(document.lastModified)) / 1000 / 60) * 100 + "");
var minutes = 0;
var hours = 0;
if (seconds < 60) {
seconds = Math.floor(seconds/10)*10;
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minutes = parseInt((seconds/60) + "");
if (minutes>60) {
hours = parseInt((seconds/60/60) +"");
labelValue += hours==1 ? " hour" : " hours";
}
else {
labelValue = minutes+"";
labelValue += minutes==1 ? " minute" : " minutes";
}
}
if (seconds<10) {
labelValue = "Updated now";
}
else {
labelValue = "Updated " + labelValue + " ago";
}
if (self.lastModifiedLabel.firstElementChild) {
self.lastModifiedLabel.firstElementChild.textContent = labelValue;
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else if ("textContent" in self.lastModifiedLabel) {
self.lastModifiedLabel.textContent = labelValue;
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}
self.getShortString = function(string, length) {
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self.getShortNumber = function(value, places) {
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value = Math.round(value * Math.pow(10,places)) / Math.pow(10, places);
return value;
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///////////////////////////////////////
// NAVIGATION CONTROLS
///////////////////////////////////////
self.updateViewLabel = function() {
var viewNavigationLabel = document.getElementById("ViewNavigationLabel");
var view = self.getVisibleView();
var viewIndex = view ? self.getViewIndex(view) : -1;
var viewName = view ? self.getViewPreferenceValue(view, self.prefix + "view-name") : null;
var viewId = view ? view.id : null;
if (viewNavigationLabel && view) {
if (viewName && viewName.indexOf('"')!=-1) {
viewName = viewName.replace(/"/g, "");
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if (self.showViewName) {
viewNavigationLabel.textContent = viewName;
self.setTooltip(viewNavigationLabel, viewIndex + 1 + " of " + self.numberOfViews);
}
else {
viewNavigationLabel.textContent = viewIndex + 1 + " of " + self.numberOfViews;
self.setTooltip(viewNavigationLabel, viewName);
}
}
}
self.updateURL = function(view) {
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var viewFragment = view ? "#"+ viewId : null;
if (viewId && self.viewIds.length>1 && self.enableDeepLinking) {
if (self.supportsPopState==false) {
self.setFragment(viewId);
}
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if (viewFragment!=window.location.hash) {
if (window.location.hash==null) {
window.history.replaceState({name:viewId}, null, viewFragment);
}
else {
window.history.pushState({name:viewId}, null, viewFragment);
}
}
}
}
}
self.updateURLState = function(view, stateName) {
stateName = view && (stateName=="" || stateName==null) ? self.getStateNameByViewId(view.id) : stateName;
if (self.supportsPopState==false) {
self.setFragment(stateName);
}
else {
if (stateName!=window.location.hash) {
if (window.location.hash==null) {
window.history.replaceState({name:view.viewId}, null, stateName);
}
else {
window.history.pushState({name:view.viewId}, null, stateName);
}
}
}
}
self.setFragment = function(value) {
window.location.hash = "#" + value;
}
self.setTooltip = function(element, value) {
// setting the tooltip in edge causes a page crash on hover
if (/Edge/.test(navigator.userAgent)) { return; }
if ("title" in element) {
element.title = value;
}
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self.getStylesheetRules = function(styleSheet) {
try {
if (styleSheet) return styleSheet.cssRules || styleSheet.rules;
return document.styleSheets[0]["cssRules"] || document.styleSheets[0]["rules"];
}
catch (error) {
// ERRORS:
// SecurityError: The operation is insecure.
// Errors happen when script loads before stylesheet or loading an external css locally
// InvalidAccessError: A parameter or an operation is not supported by the underlying object
// Place script after stylesheet
console.log(error);
if (error.toString().indexOf("The operation is insecure")!=-1) {
console.log("Load the stylesheet before the script or load the stylesheet inline until it can be loaded on a server")
}
return [];
}
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* If single page application hide all of the views.
* @param {Number} selectedIndex if provided shows the view at index provided
**/
self.hideViews = function(selectedIndex, animation) {
var rules = self.getStylesheetRules();
var queryIndex = 0;
var numberOfRules = rules!=null ? rules.length : 0;
// loop through rules and hide media queries except selected
for (var i=0;i<numberOfRules;i++) {
var rule = rules[i];
var cssText = rule && rule.cssText;
if (rule.media!=null && cssText.match("--web-view-name:")) {
if (queryIndex==selectedIndex) {
self.currentQuery.mediaText = rule.conditionText;
self.currentQuery.index = selectedIndex;
self.currentQuery.rule = rule;
self.enableMediaQuery(rule);
}
else {
if (animation) {
self.fadeOut(rule)
}
else {
self.disableMediaQuery(rule);
}
}
queryIndex++;
}
}
self.numberOfViews = queryIndex;
self.updateViewLabel();
self.updateURL();
self.dispatchViewChange();
var view = self.getVisibleView();
var viewIndex = view ? self.getViewIndex(view) : -1;
return viewIndex==selectedIndex ? view : null;
}
/**
* If single page application hide all of the views.
* @param {HTMLElement} selectedView if provided shows the view passed in
**/
self.hideAllViews = function(selectedView, animation) {
var views = self.views;
var queryIndex = 0;
var numberOfViews = views!=null ? views.length : 0;
// loop through rules and hide media queries except selected
for (var i=0;i<numberOfViews;i++) {
var viewData = views[i];
var view = viewData && viewData.view;
var mediaRule = viewData && viewData.mediaRule;
if (view==selectedView) {
self.currentQuery.mediaText = mediaRule.conditionText;
self.currentQuery.index = queryIndex;
self.currentQuery.rule = mediaRule;
self.enableMediaQuery(mediaRule);
}
else {
if (animation) {
self.fadeOut(mediaRule)
}
else {
self.disableMediaQuery(mediaRule);
}
}
queryIndex++;
}
self.numberOfViews = queryIndex;
self.updateViewLabel();
self.updateURL();
self.dispatchViewChange();
var visibleView = self.getVisibleView();
return visibleView==selectedView ? selectedView : null;
}
/**
* Hide view
* @param {Object} view element to hide
**/
self.hideView = function(view) {
var rule = view ? self.mediaQueryDictionary[view.id] : null;
if (rule) {
self.disableMediaQuery(rule);
}
}
/**
* Hide overlay
* @param {Object} overlay element to hide
**/
self.hideOverlay = function(overlay) {
var rule = overlay ? self.mediaQueryDictionary[overlay.id] : null;
if (rule) {
self.disableMediaQuery(rule);
//if (self.showByMediaQuery) {
overlay.style.display = "none";
//}
}
}
/**
* Show the view by media query. Does not hide current views
* Sets view options by default
* @param {Object} view element to show
* @param {Boolean} setViewOptions sets view options if null or true
*/
self.showViewByMediaQuery = function(view, setViewOptions) {
var id = view ? view.id : null;
var query = id ? self.mediaQueryDictionary[id] : null;
var isOverlay = view ? self.isOverlay(view) : false;
setViewOptions = setViewOptions==null ? true : setViewOptions;
if (query) {
self.enableMediaQuery(query);
if (isOverlay && view && setViewOptions) {
self.setViewVariables(null, view);
}
else {
if (view && setViewOptions) self.setViewOptions(view);
if (view && setViewOptions) self.setViewVariables(view);
}
}
}
/**
* Show the view. Does not hide current views
*/
self.showView = function(view, setViewOptions) {
var id = view ? view.id : null;
var query = id ? self.mediaQueryDictionary[id] : null;
var display = null;
setViewOptions = setViewOptions==null ? true : setViewOptions;
if (query) {
self.enableMediaQuery(query);
if (view==null) view =self.getVisibleView();
if (view && setViewOptions) self.setViewOptions(view);
}
else if (id) {
display = window.getComputedStyle(view).getPropertyValue("display");
if (display=="" || display=="none") {
view.style.display = "block";
}
}
if (view) {
if (self.currentView!=null) {
self.lastView = self.currentView;
}
self.currentView = view;
}
}
self.showViewById = function(id, setViewOptions) {
var view = id ? self.getViewById(id) : null;
if (view) {
self.showView(view);
return;
}
self.log("View not found '" + id + "'");
}
self.getElementView = function(element) {
var view = element;
var viewFound = false;
while (viewFound==false || view==null) {
if (view && self.viewsDictionary[view.id]) {
return view;
}
view = view.parentNode;
}
}
/**
* Show overlay over view
* @param {Event | HTMLElement} event event or html element with styles applied
* @param {String} id id of view or view reference
* @param {Number} x x location
* @param {Number} y y location
*/
self.showOverlay = function(event, id, x, y) {
var overlay = id && typeof id === 'string' ? self.getViewById(id) : id ? id : null;
var query = overlay ? self.mediaQueryDictionary[overlay.id] : null;
var centerHorizontally = false;
var centerVertically = false;
var anchorLeft = false;
var anchorTop = false;
var anchorRight = false;
var anchorBottom = false;
var display = null;
var reparent = true;
var view = null;
if (overlay==null || overlay==false) {
self.log("Overlay not found, '"+ id + "'");
return;
}
// get enter animation - event target must have css variables declared
if (event) {
var button = event.currentTarget || event; // can be event or htmlelement
var buttonComputedStyles = getComputedStyle(button);
var actionTargetValue = buttonComputedStyles.getPropertyValue(self.prefix+"action-target").trim();
var animation = buttonComputedStyles.getPropertyValue(self.prefix+"animation").trim();
var isAnimated = animation!="";
var targetType = buttonComputedStyles.getPropertyValue(self.prefix+"action-type").trim();
var actionTarget = self.application ? null : self.getElement(actionTargetValue);
var actionTargetStyles = actionTarget ? actionTarget.style : null;
if (actionTargetStyles) {
actionTargetStyles.setProperty("animation", animation);
}
if ("stopImmediatePropagation" in event) {
event.stopImmediatePropagation();
}
}
if (self.application==false || targetType=="page") {
document.location.href = "./" + actionTargetValue;
return;
}
// remove any current overlays
if (self.currentOverlay) {
// act as switch if same button
if (self.currentOverlay==actionTarget || self.currentOverlay==null) {
if (self.lastTrigger==button) {
self.removeOverlay(isAnimated);
return;
}
}
else {
self.removeOverlay(isAnimated);
}
}
if (reparent) {
view = self.getElementView(button);
if (view) {
view.appendChild(overlay);
}
}
if (query) {
//self.setElementAnimation(overlay, null);
//overlay.style.animation = animation;
self.enableMediaQuery(query);
var display = overlay && overlay.style.display;
if (overlay && display=="" || display=="none") {
overlay.style.display = "block";
//self.setViewOptions(overlay);
}
// add animation defined in event target style declaration
if (animation && self.supportAnimations) {
self.fadeIn(overlay, false, animation);
}
}
else if (id) {
display = window.getComputedStyle(overlay).getPropertyValue("display");
if (display=="" || display=="none") {
overlay.style.display = "block";
}
// add animation defined in event target style declaration
if (animation && self.supportAnimations) {
self.fadeIn(overlay, false, animation);
}
}
// do not set x or y position if centering
var horizontal = self.prefix + "center-horizontally";
var vertical = self.prefix + "center-vertically";
var style = overlay.style;
var transform = [];
centerHorizontally = self.getIsStyleDefined(id, horizontal) ? self.getViewPreferenceBoolean(overlay, horizontal) : false;
centerVertically = self.getIsStyleDefined(id, vertical) ? self.getViewPreferenceBoolean(overlay, vertical) : false;
anchorLeft = self.getIsStyleDefined(id, "left");
anchorRight = self.getIsStyleDefined(id, "right");
anchorTop = self.getIsStyleDefined(id, "top");
anchorBottom = self.getIsStyleDefined(id, "bottom");
if (self.viewsDictionary[overlay.id] && self.viewsDictionary[overlay.id].styleDeclaration) {
style = self.viewsDictionary[overlay.id].styleDeclaration.style;
}
if (centerHorizontally) {
style.left = "50%";
style.transformOrigin = "0 0";
transform.push("translateX(-50%)");
}
else if (anchorRight && anchorLeft) {
style.left = x + "px";
}
else if (anchorRight) {
//style.right = x + "px";
}
else {
style.left = x + "px";
}
if (centerVertically) {
style.top = "50%";
transform.push("translateY(-50%)");
style.transformOrigin = "0 0";
}
else if (anchorTop && anchorBottom) {
style.top = y + "px";
}
else if (anchorBottom) {
//style.bottom = y + "px";
}
else {
style.top = y + "px";
}
if (transform.length) {
style.transform = transform.join(" ");
}
self.currentOverlay = overlay;
self.lastTrigger = button;
}
self.goBack = function() {
if (self.currentOverlay) {
self.removeOverlay();
}
else if (self.lastView) {
self.goToView(self.lastView.id);
}
}
self.removeOverlay = function(animate) {
var overlay = self.currentOverlay;
animate = animate===false ? false : true;
if (overlay) {
var style = overlay.style;
if (style.animation && self.supportAnimations && animate) {
self.reverseAnimation(overlay, true);
var duration = self.getAnimationDuration(style.animation, true);
setTimeout(function() {
self.setElementAnimation(overlay, null);
self.hideOverlay(overlay);
self.currentOverlay = null;
}, duration);
}
else {
self.setElementAnimation(overlay, null);
self.hideOverlay(overlay);
self.currentOverlay = null;
}
}
}
/**
* Reverse the animation and hide after
* @param {Object} target element with animation
* @param {Boolean} hide hide after animation ends
*/
self.reverseAnimation = function(target, hide) {
var lastAnimation = null;
var style = target.style;
style.animationPlayState = "paused";
lastAnimation = style.animation;
style.animation = null;
style.animationPlayState = "paused";
if (hide) {
//target.addEventListener("animationend", self.animationEndHideHandler);
var duration = self.getAnimationDuration(lastAnimation, true);
var isOverlay = self.isOverlay(target);
setTimeout(function() {
self.setElementAnimation(target, null);
if (isOverlay) {
self.hideOverlay(target);
}
else {
self.hideView(target);
}
}, duration);
}
setTimeout(function() {
style.animation = lastAnimation;
style.animationPlayState = "paused";
style.animationDirection = "reverse";
style.animationPlayState = "running";
}, 30);
}
self.animationEndHandler = function(event) {
var target = event.currentTarget;
self.dispatchEvent(new Event(event.type));
}
self.isOverlay = function(view) {
var result = view ? self.getViewPreferenceBoolean(view, self.prefix + "is-overlay") : false;
return result;
}
self.animationEndHideHandler = function(event) {
var target = event.currentTarget;
self.setViewVariables(null, target);
self.hideView(target);
target.removeEventListener("animationend", self.animationEndHideHandler);
}
self.animationEndShowHandler = function(event) {
var target = event.currentTarget;
target.removeEventListener("animationend", self.animationEndShowHandler);
}
self.setViewOptions = function(view) {
if (view) {
self.minimumScale = self.getViewPreferenceValue(view, self.prefix + "minimum-scale");
self.maximumScale = self.getViewPreferenceValue(view, self.prefix + "maximum-scale");
self.scaleViewsToFit = self.getViewPreferenceBoolean(view, self.prefix + "scale-to-fit");
self.scaleToFitType = self.getViewPreferenceValue(view, self.prefix + "scale-to-fit-type");
self.scaleToFitOnDoubleClick = self.getViewPreferenceBoolean(view, self.prefix + "scale-on-double-click");
self.actualSizeOnDoubleClick = self.getViewPreferenceBoolean(view, self.prefix + "actual-size-on-double-click");
self.scaleViewsOnResize = self.getViewPreferenceBoolean(view, self.prefix + "scale-on-resize");
self.enableScaleUp = self.getViewPreferenceBoolean(view, self.prefix + "enable-scale-up");
self.centerHorizontally = self.getViewPreferenceBoolean(view, self.prefix + "center-horizontally");
self.centerVertically = self.getViewPreferenceBoolean(view, self.prefix + "center-vertically");
self.navigationOnKeypress = self.getViewPreferenceBoolean(view, self.prefix + "navigate-on-keypress");
self.showViewName = self.getViewPreferenceBoolean(view, self.prefix + "show-view-name");
self.refreshPageForChanges = self.getViewPreferenceBoolean(view, self.prefix + "refresh-for-changes");
self.refreshPageForChangesInterval = self.getViewPreferenceValue(view, self.prefix + "refresh-interval");
self.showNavigationControls = self.getViewPreferenceBoolean(view, self.prefix + "show-navigation-controls");
self.scaleViewSlider = self.getViewPreferenceBoolean(view, self.prefix + "show-scale-controls");
self.enableDeepLinking = self.getViewPreferenceBoolean(view, self.prefix + "enable-deep-linking");
self.singlePageApplication = self.getViewPreferenceBoolean(view, self.prefix + "application");
self.showByMediaQuery = self.getViewPreferenceBoolean(view, self.prefix + "show-by-media-query");
self.showUpdateNotification = document.cookie!="" ? document.cookie.indexOf(self.pageRefreshedName)!=-1 : false;
self.imageComparisonDuration = self.getViewPreferenceValue(view, self.prefix + "image-comparison-duration");
self.supportAnimations = self.getViewPreferenceBoolean(view, self.prefix + "enable-animations", true);
if (self.scaleViewsToFit) {
var newScaleValue = self.scaleViewToFit(view);
if (newScaleValue<0) {
setTimeout(self.scaleViewToFit, 500, view);
}
}
else {
self.viewScale = self.getViewScaleValue(view);
self.viewToFitWidthScale = self.getViewFitToViewportWidthScale(view, self.enableScaleUp)
self.viewToFitHeightScale = self.getViewFitToViewportScale(view, self.enableScaleUp);
self.updateSliderValue(self.viewScale);
}
if (self.imageComparisonDuration!=null) {
// todo
}
if (self.refreshPageForChangesInterval!=null) {
self.refreshDuration = Number(self.refreshPageForChangesInterval);
}
}
}
self.previousView = function(event) {
var rules = self.getStylesheetRules();
var view = self.getVisibleView()
var index = view ? self.getViewIndex(view) : -1;
var prevQueryIndex = index!=-1 ? index-1 : self.currentQuery.index-1;
var queryIndex = 0;
var numberOfRules = rules!=null ? rules.length : 0;
if (event) {
event.stopImmediatePropagation();
}
if (prevQueryIndex<0) {
return;
}
// loop through rules and hide media queries except selected
for (var i=0;i<numberOfRules;i++) {
var rule = rules[i];
if (rule.media!=null) {
if (queryIndex==prevQueryIndex) {
self.currentQuery.mediaText = rule.conditionText;
self.currentQuery.index = prevQueryIndex;
self.currentQuery.rule = rule;
self.enableMediaQuery(rule);
self.updateViewLabel();
self.updateURL();
self.dispatchViewChange();
}
else {
self.disableMediaQuery(rule);
}
queryIndex++;
}
}
}
self.nextView = function(event) {
var rules = self.getStylesheetRules();
var view = self.getVisibleView();
var index = view ? self.getViewIndex(view) : -1;
var nextQueryIndex = index!=-1 ? index+1 : self.currentQuery.index+1;
var queryIndex = 0;
var numberOfRules = rules!=null ? rules.length : 0;
var numberOfMediaQueries = self.getNumberOfMediaRules();
if (event) {
event.stopImmediatePropagation();
}
if (nextQueryIndex>=numberOfMediaQueries) {
return;
}
// loop through rules and hide media queries except selected
for (var i=0;i<numberOfRules;i++) {
var rule = rules[i];
if (rule.media!=null) {
if (queryIndex==nextQueryIndex) {
self.currentQuery.mediaText = rule.conditionText;
self.currentQuery.index = nextQueryIndex;
self.currentQuery.rule = rule;
self.enableMediaQuery(rule);
self.updateViewLabel();
self.updateURL();
self.dispatchViewChange();
}
else {
self.disableMediaQuery(rule);
}
queryIndex++;
}
}
}
/**
* Enables a view via media query
*/
self.enableMediaQuery = function(rule) {
try {
rule.media.mediaText = self.inclusionQuery;
}
catch(error) {
//self.log(error);
rule.conditionText = self.inclusionQuery;
}
}
self.disableMediaQuery = function(rule) {
try {
rule.media.mediaText = self.exclusionQuery;
}
catch(error) {
rule.conditionText = self.exclusionQuery;
}
}
self.dispatchViewChange = function() {
try {
var event = new Event(self.NAVIGATION_CHANGE);
window.dispatchEvent(event);
}
catch (error) {
// In IE 11: Object doesn't support this action
}
}
self.getNumberOfMediaRules = function() {
var rules = self.getStylesheetRules();
var numberOfRules = rules ? rules.length : 0;
var numberOfQueries = 0;
for (var i=0;i<numberOfRules;i++) {
if (rules[i].media!=null) { numberOfQueries++; }
}
return numberOfQueries;
}
/////////////////////////////////////////
// VIEW SCALE
/////////////////////////////////////////
self.sliderChangeHandler = function(event) {
var value = self.getShortNumber(event.currentTarget.value/100);
var view = self.getVisibleView();
self.setViewScaleValue(view, false, value, true);
}
self.updateSliderValue = function(scale) {
var slider = document.getElementById(self.viewScaleSliderId);
var tooltip = parseInt(scale * 100 + "") + "%";
var inputType;
var inputValue;
if (slider) {
inputValue = self.getShortNumber(scale * 100);
if (inputValue!=slider["value"]) {
slider["value"] = inputValue;
}
inputType = slider.getAttributeNS(null, "type");
if (inputType!="range") {
// input range is not supported
slider.style.display = "none";
}
self.setTooltip(slider, tooltip);
}
}
self.viewChangeHandler = function(event) {
var view = self.getVisibleView();
var matrix = view ? getComputedStyle(view).transform : null;
if (matrix) {
self.viewScale = self.getViewScaleValue(view);
var scaleNeededToFit = self.getViewFitToViewportScale(view);
var isViewLargerThanViewport = scaleNeededToFit<1;
// scale large view to fit if scale to fit is enabled
if (self.scaleViewsToFit) {
self.scaleViewToFit(view);
}
else {
self.updateSliderValue(self.viewScale);
}
}
}
self.getViewScaleValue = function(view) {
var matrix = getComputedStyle(view).transform;
if (matrix) {
var matrixArray = matrix.replace("matrix(", "").split(",");
var scaleX = parseFloat(matrixArray[0]);
var scaleY = parseFloat(matrixArray[3]);
var scale = Math.min(scaleX, scaleY);
}
return scale;
}
/**
* Scales view to scale.
* @param {Object} view view to scale. views are in views array
* @param {Boolean} scaleToFit set to true to scale to fit. set false to use desired scale value
* @param {Number} desiredScale scale to define. not used if scale to fit is false
* @param {Boolean} isSliderChange indicates if slider is callee
*/
self.setViewScaleValue = function(view, scaleToFit, desiredScale, isSliderChange) {
var enableScaleUp = self.enableScaleUp;
var scaleToFitType = self.scaleToFitType;
var minimumScale = self.minimumScale;
var maximumScale = self.maximumScale;
var hasMinimumScale = !isNaN(minimumScale) && minimumScale!="";
var hasMaximumScale = !isNaN(maximumScale) && maximumScale!="";
var scaleNeededToFit = self.getViewFitToViewportScale(view, enableScaleUp);
var scaleNeededToFitWidth = self.getViewFitToViewportWidthScale(view, enableScaleUp);
var scaleNeededToFitHeight = self.getViewFitToViewportHeightScale(view, enableScaleUp);
var scaleToFitFull = self.getViewFitToViewportScale(view, true);
var scaleToFitFullWidth = self.getViewFitToViewportWidthScale(view, true);
var scaleToFitFullHeight = self.getViewFitToViewportHeightScale(view, true);
var scaleToWidth = scaleToFitType=="width";
var scaleToHeight = scaleToFitType=="height";
var shrunkToFit = false;
var topPosition = null;
var leftPosition = null;
var translateY = null;
var translateX = null;
var transformValue = "";
var canCenterVertically = true;
var canCenterHorizontally = true;
var style = view.style;
if (view && self.viewsDictionary[view.id] && self.viewsDictionary[view.id].styleDeclaration) {
style = self.viewsDictionary[view.id].styleDeclaration.style;
}
if (scaleToFit && isSliderChange!=true) {
if (scaleToFitType=="fit" || scaleToFitType=="") {
desiredScale = scaleNeededToFit;
}
else if (scaleToFitType=="width") {
desiredScale = scaleNeededToFitWidth;
}
else if (scaleToFitType=="height") {
desiredScale = scaleNeededToFitHeight;
}
}
else {
if (isNaN(desiredScale)) {
desiredScale = 1;
}
}
self.updateSliderValue(desiredScale);
// scale to fit width
if (scaleToWidth && scaleToHeight==false) {
canCenterVertically = scaleNeededToFitHeight>=scaleNeededToFitWidth;
canCenterHorizontally = scaleNeededToFitWidth>=1 && enableScaleUp==false;
if (isSliderChange) {
canCenterHorizontally = desiredScale<scaleToFitFullWidth;
}
else if (scaleToFit) {
desiredScale = scaleNeededToFitWidth;
}
if (hasMinimumScale) {
desiredScale = Math.max(desiredScale, Number(minimumScale));
}
if (hasMaximumScale) {
desiredScale = Math.min(desiredScale, Number(maximumScale));
}
desiredScale = self.getShortNumber(desiredScale);
canCenterHorizontally = self.canCenterHorizontally(view, "width", enableScaleUp, desiredScale, minimumScale, maximumScale);
canCenterVertically = self.canCenterVertically(view, "width", enableScaleUp, desiredScale, minimumScale, maximumScale);
if (desiredScale>1 && (enableScaleUp || isSliderChange)) {
transformValue = "scale(" + desiredScale + ")";
}
else if (desiredScale>=1 && enableScaleUp==false) {
transformValue = "scale(" + 1 + ")";
}
else {
transformValue = "scale(" + desiredScale + ")";
}
if (self.centerVertically) {
if (canCenterVertically) {
translateY = "-50%";
topPosition = "50%";
}
else {
translateY = "0";
topPosition = "0";
}
if (style.top != topPosition) {
style.top = topPosition + "";
}
if (canCenterVertically) {
transformValue += " translateY(" + translateY+ ")";
}
}
if (self.centerHorizontally) {
if (canCenterHorizontally) {
translateX = "-50%";
leftPosition = "50%";
}
else {
translateX = "0";
leftPosition = "0";
}
if (style.left != leftPosition) {
style.left = leftPosition + "";
}
if (canCenterHorizontally) {
transformValue += " translateX(" + translateX+ ")";
}
}
style.transformOrigin = "0 0";
style.transform = transformValue;
self.viewScale = desiredScale;
self.viewToFitWidthScale = scaleNeededToFitWidth;
self.viewToFitHeightScale = scaleNeededToFitHeight;
self.viewLeft = leftPosition;
self.viewTop = topPosition;
return desiredScale;
}
// scale to fit height
if (scaleToHeight && scaleToWidth==false) {
//canCenterVertically = scaleNeededToFitHeight>=scaleNeededToFitWidth;
//canCenterHorizontally = scaleNeededToFitHeight<=scaleNeededToFitWidth && enableScaleUp==false;
canCenterVertically = scaleNeededToFitHeight>=scaleNeededToFitWidth;
canCenterHorizontally = scaleNeededToFitWidth>=1 && enableScaleUp==false;
if (isSliderChange) {
canCenterHorizontally = desiredScale<scaleToFitFullHeight;
}
else if (scaleToFit) {
desiredScale = scaleNeededToFitHeight;
}
if (hasMinimumScale) {
desiredScale = Math.max(desiredScale, Number(minimumScale));
}
if (hasMaximumScale) {
desiredScale = Math.min(desiredScale, Number(maximumScale));
//canCenterVertically = desiredScale>=scaleNeededToFitHeight && enableScaleUp==false;
}
desiredScale = self.getShortNumber(desiredScale);
canCenterHorizontally = self.canCenterHorizontally(view, "height", enableScaleUp, desiredScale, minimumScale, maximumScale);
canCenterVertically = self.canCenterVertically(view, "height", enableScaleUp, desiredScale, minimumScale, maximumScale);
if (desiredScale>1 && (enableScaleUp || isSliderChange)) {
transformValue = "scale(" + desiredScale + ")";
}
else if (desiredScale>=1 && enableScaleUp==false) {
transformValue = "scale(" + 1 + ")";
}
else {
transformValue = "scale(" + desiredScale + ")";
}
if (self.centerHorizontally) {
if (canCenterHorizontally) {
translateX = "-50%";
leftPosition = "50%";
}
else {
translateX = "0";
leftPosition = "0";
}
if (style.left != leftPosition) {
style.left = leftPosition + "";
}
if (canCenterHorizontally) {
transformValue += " translateX(" + translateX+ ")";
}
}
if (self.centerVertically) {
if (canCenterVertically) {
translateY = "-50%";
topPosition = "50%";
}
else {
translateY = "0";
topPosition = "0";
}
if (style.top != topPosition) {
style.top = topPosition + "";
}
if (canCenterVertically) {
transformValue += " translateY(" + translateY+ ")";
}
}
style.transformOrigin = "0 0";
style.transform = transformValue;
self.viewScale = desiredScale;
self.viewToFitWidthScale = scaleNeededToFitWidth;
self.viewToFitHeightScale = scaleNeededToFitHeight;
self.viewLeft = leftPosition;
self.viewTop = topPosition;
return scaleNeededToFitHeight;
}
if (scaleToFitType=="fit") {
//canCenterVertically = scaleNeededToFitHeight>=scaleNeededToFitWidth;
//canCenterHorizontally = scaleNeededToFitWidth>=scaleNeededToFitHeight;
canCenterVertically = scaleNeededToFitHeight>=scaleNeededToFit;
canCenterHorizontally = scaleNeededToFitWidth>=scaleNeededToFit;
if (hasMinimumScale) {
desiredScale = Math.max(desiredScale, Number(minimumScale));
}
desiredScale = self.getShortNumber(desiredScale);
if (isSliderChange || scaleToFit==false) {
canCenterVertically = scaleToFitFullHeight>=desiredScale;
canCenterHorizontally = desiredScale<scaleToFitFullWidth;
}
else if (scaleToFit) {
desiredScale = scaleNeededToFit;
}
transformValue = "scale(" + desiredScale + ")";
//canCenterHorizontally = self.canCenterHorizontally(view, "fit", false, desiredScale);
//canCenterVertically = self.canCenterVertically(view, "fit", false, desiredScale);
if (self.centerVertically) {
if (canCenterVertically) {
translateY = "-50%";
topPosition = "50%";
}
else {
translateY = "0";
topPosition = "0";
}
if (style.top != topPosition) {
style.top = topPosition + "";
}
if (canCenterVertically) {
transformValue += " translateY(" + translateY+ ")";
}
}
if (self.centerHorizontally) {
if (canCenterHorizontally) {
translateX = "-50%";
leftPosition = "50%";
}
else {
translateX = "0";
leftPosition = "0";
}
if (style.left != leftPosition) {
style.left = leftPosition + "";
}
if (canCenterHorizontally) {
transformValue += " translateX(" + translateX+ ")";
}
}
style.transformOrigin = "0 0";
style.transform = transformValue;
self.viewScale = desiredScale;
self.viewToFitWidthScale = scaleNeededToFitWidth;
self.viewToFitHeightScale = scaleNeededToFitHeight;
self.viewLeft = leftPosition;
self.viewTop = topPosition;
self.updateSliderValue(desiredScale);
return desiredScale;
}
if (scaleToFitType=="default" || scaleToFitType=="") {
desiredScale = 1;
if (hasMinimumScale) {
desiredScale = Math.max(desiredScale, Number(minimumScale));
}
if (hasMaximumScale) {
desiredScale = Math.min(desiredScale, Number(maximumScale));
}
canCenterHorizontally = self.canCenterHorizontally(view, "none", false, desiredScale, minimumScale, maximumScale);
canCenterVertically = self.canCenterVertically(view, "none", false, desiredScale, minimumScale, maximumScale);
if (self.centerVertically) {
if (canCenterVertically) {
translateY = "-50%";
topPosition = "50%";
}
else {
translateY = "0";
topPosition = "0";
}
if (style.top != topPosition) {
style.top = topPosition + "";
}
if (canCenterVertically) {
transformValue += " translateY(" + translateY+ ")";
}
}
if (self.centerHorizontally) {
if (canCenterHorizontally) {
translateX = "-50%";
leftPosition = "50%";
}
else {
translateX = "0";
leftPosition = "0";
}
if (style.left != leftPosition) {
style.left = leftPosition + "";
}
if (canCenterHorizontally) {
transformValue += " translateX(" + translateX+ ")";
}
else {
transformValue += " translateX(" + 0 + ")";
}
}
style.transformOrigin = "0 0";
style.transform = transformValue;
self.viewScale = desiredScale;
self.viewToFitWidthScale = scaleNeededToFitWidth;
self.viewToFitHeightScale = scaleNeededToFitHeight;
self.viewLeft = leftPosition;
self.viewTop = topPosition;
self.updateSliderValue(desiredScale);
return desiredScale;
}
}
/**
* Returns true if view can be centered horizontally
* @param {HTMLElement} view view
* @param {String} type type of scaling - width, height, all, none
* @param {Boolean} scaleUp if scale up enabled
* @param {Number} scale target scale value
*/
self.canCenterHorizontally = function(view, type, scaleUp, scale, minimumScale, maximumScale) {
var scaleNeededToFit = self.getViewFitToViewportScale(view, scaleUp);
var scaleNeededToFitHeight = self.getViewFitToViewportHeightScale(view, scaleUp);
var scaleNeededToFitWidth = self.getViewFitToViewportWidthScale(view, scaleUp);
var canCenter = false;
var minScale;
type = type==null ? "none" : type;
scale = scale==null ? scale : scaleNeededToFitWidth;
scaleUp = scaleUp == null ? false : scaleUp;
if (type=="width") {
if (scaleUp && maximumScale==null) {
canCenter = false;
}
else if (scaleNeededToFitWidth>=1) {
canCenter = true;
}
}
else if (type=="height") {
minScale = Math.min(1, scaleNeededToFitHeight);
if (minimumScale!="" && maximumScale!="") {
minScale = Math.max(minimumScale, Math.min(maximumScale, scaleNeededToFitHeight));
}
else {
if (minimumScale!="") {
minScale = Math.max(minimumScale, scaleNeededToFitHeight);
}
if (maximumScale!="") {
minScale = Math.max(minimumScale, Math.min(maximumScale, scaleNeededToFitHeight));
}
}
if (scaleUp && maximumScale=="") {
canCenter = false;
}
else if (scaleNeededToFitWidth>=minScale) {
canCenter = true;
}
}
else if (type=="fit") {
canCenter = scaleNeededToFitWidth>=scaleNeededToFit;
}
else {
if (scaleUp) {
canCenter = false;
}
else if (scaleNeededToFitWidth>=1) {
canCenter = true;
}
}
self.horizontalScrollbarsNeeded = canCenter;
return canCenter;
}
/**
* Returns true if view can be centered horizontally
* @param {HTMLElement} view view to scale
* @param {String} type type of scaling
* @param {Boolean} scaleUp if scale up enabled
* @param {Number} scale target scale value
*/
self.canCenterVertically = function(view, type, scaleUp, scale, minimumScale, maximumScale) {
var scaleNeededToFit = self.getViewFitToViewportScale(view, scaleUp);
var scaleNeededToFitWidth = self.getViewFitToViewportWidthScale(view, scaleUp);
var scaleNeededToFitHeight = self.getViewFitToViewportHeightScale(view, scaleUp);
var canCenter = false;
var minScale;
type = type==null ? "none" : type;
scale = scale==null ? 1 : scale;
scaleUp = scaleUp == null ? false : scaleUp;
if (type=="width") {
canCenter = scaleNeededToFitHeight>=scaleNeededToFitWidth;
}
else if (type=="height") {
minScale = Math.max(minimumScale, Math.min(maximumScale, scaleNeededToFit));
canCenter = scaleNeededToFitHeight>=minScale;
}
else if (type=="fit") {
canCenter = scaleNeededToFitHeight>=scaleNeededToFit;
}
else {
if (scaleUp) {
canCenter = false;
}
else if (scaleNeededToFitHeight>=1) {
canCenter = true;
}
}
self.verticalScrollbarsNeeded = canCenter;
return canCenter;
}
self.getViewFitToViewportScale = function(view, scaleUp) {
var enableScaleUp = scaleUp;
var availableWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
var availableHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
var elementWidth = parseFloat(getComputedStyle(view, "style").width);
var elementHeight = parseFloat(getComputedStyle(view, "style").height);
var newScale = 1;
// if element is not added to the document computed values are NaN
if (isNaN(elementWidth) || isNaN(elementHeight)) {
return newScale;
}
availableWidth -= self.horizontalPadding;
availableHeight -= self.verticalPadding;
if (enableScaleUp) {
newScale = Math.min(availableHeight/elementHeight, availableWidth/elementWidth);
}
else if (elementWidth > availableWidth || elementHeight > availableHeight) {
newScale = Math.min(availableHeight/elementHeight, availableWidth/elementWidth);
}
return newScale;
}
self.getViewFitToViewportWidthScale = function(view, scaleUp) {
// need to get browser viewport width when element
var isParentWindow = view && view.parentNode && view.parentNode===document.body;
var enableScaleUp = scaleUp;
var availableWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
var elementWidth = parseFloat(getComputedStyle(view, "style").width);
var newScale = 1;
// if element is not added to the document computed values are NaN
if (isNaN(elementWidth)) {
return newScale;
}
availableWidth -= self.horizontalPadding;
if (enableScaleUp) {
newScale = availableWidth/elementWidth;
}
else if (elementWidth > availableWidth) {
newScale = availableWidth/elementWidth;
}
return newScale;
}
self.getViewFitToViewportHeightScale = function(view, scaleUp) {
var enableScaleUp = scaleUp;
var availableHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
var elementHeight = parseFloat(getComputedStyle(view, "style").height);
var newScale = 1;
// if element is not added to the document computed values are NaN
if (isNaN(elementHeight)) {
return newScale;
}
availableHeight -= self.verticalPadding;
if (enableScaleUp) {
newScale = availableHeight/elementHeight;
}
else if (elementHeight > availableHeight) {
newScale = availableHeight/elementHeight;
}
return newScale;
}
self.keypressHandler = function(event) {
var rightKey = 39;
var leftKey = 37;
// listen for both events
if (event.type=="keypress") {
window.removeEventListener("keyup", self.keypressHandler);
}
else {
window.removeEventListener("keypress", self.keypressHandler);
}
if (self.showNavigationControls) {
if (self.navigationOnKeypress) {
if (event.keyCode==rightKey) {
self.nextView();
}
if (event.keyCode==leftKey) {
self.previousView();
}
}
}
else if (self.navigationOnKeypress) {
if (event.keyCode==rightKey) {
self.nextView();
}
if (event.keyCode==leftKey) {
self.previousView();
}
}
}
///////////////////////////////////
// GENERAL FUNCTIONS
///////////////////////////////////
self.getViewById = function(id) {
id = id ? id.replace("#", "") : "";
var view = self.viewIds.indexOf(id)!=-1 && self.getElement(id);
return view;
}
self.getViewIds = function() {
var viewIds = self.getViewPreferenceValue(document.body, self.prefix + "view-ids");
var viewId = null;
viewIds = viewIds!=null && viewIds!="" ? viewIds.split(",") : [];
if (viewIds.length==0) {
viewId = self.getViewPreferenceValue(document.body, self.prefix + "view-id");
viewIds = viewId ? [viewId] : [];
}
return viewIds;
}
self.getInitialViewId = function() {
var viewId = self.getViewPreferenceValue(document.body, self.prefix + "view-id");
return viewId;
}
self.getApplicationStylesheet = function() {
var stylesheetId = self.getViewPreferenceValue(document.body, self.prefix + "stylesheet-id");
self.applicationStylesheet = document.getElementById("applicationStylesheet");
return self.applicationStylesheet.sheet;
}
self.getVisibleView = function() {
var viewIds = self.getViewIds();
for (var i=0;i<viewIds.length;i++) {
var viewId = viewIds[i].replace(/[\#?\.?](.*)/, "$" + "1");
var view = self.getElement(viewId);
var postName = "_Class";
if (view==null && viewId && viewId.lastIndexOf(postName)!=-1) {
view = self.getElement(viewId.replace(postName, ""));
}
if (view) {
var display = getComputedStyle(view).display;
if (display=="block" || display=="flex") {
return view;
}
}
}
return null;
}
self.getVisibleViews = function() {
var viewIds = self.getViewIds();
var views = [];
for (var i=0;i<viewIds.length;i++) {
var viewId = viewIds[i].replace(/[\#?\.?](.*)/, "$" + "1");
var view = self.getElement(viewId);
var postName = "_Class";
if (view==null && viewId && viewId.lastIndexOf(postName)!=-1) {
view = self.getElement(viewId.replace(postName, ""));
}
if (view) {
var display = getComputedStyle(view).display;
if (display=="none") {
continue;
}
if (display=="block" || display=="flex") {
views.push(view);
}
}
}
return views;
}
self.getStateNameByViewId = function(id) {
var state = self.viewsDictionary[id];
return state && state.stateName;
}
self.getMatchingViews = function(ids) {
var views = self.addedViews.slice(0);
var matchingViews = [];
if (self.showByMediaQuery) {
for (let index = 0; index < views.length; index++) {
var viewId = views[index];
var state = self.viewsDictionary[viewId];
var rule = state && state.rule;
var matchResults = window.matchMedia(rule.conditionText);
var view = self.views[viewId];
if (matchResults.matches) {
if (ids==true) {
matchingViews.push(viewId);
}
else {
matchingViews.push(view);
}
}
}
}
return matchingViews;
}
self.ruleMatchesQuery = function(rule) {
var result = window.matchMedia(rule.conditionText);
return result.matches;
}
self.getViewsByStateName = function(stateName, matchQuery) {
var views = self.addedViews.slice(0);
var matchingViews = [];
if (self.showByMediaQuery) {
// find state name
for (let index = 0; index < views.length; index++) {
var viewId = views[index];
var state = self.viewsDictionary[viewId];
var rule = state.rule;
var mediaRule = state.mediaRule;
var view = self.views[viewId];
var viewStateName = self.getStyleRuleValue(mediaRule, self.STATE_NAME, state);
var stateFoundAtt = view.getAttribute(self.STATE_NAME)==state;
var matchesResults = false;
if (viewStateName==stateName) {
if (matchQuery) {
matchesResults = self.ruleMatchesQuery(rule);
if (matchesResults) {
matchingViews.push(view);
}
}
else {
matchingViews.push(view);
}
}
}
}
return matchingViews;
}
self.getInitialView = function() {
var viewId = self.getInitialViewId();
viewId = viewId.replace(/[\#?\.?](.*)/, "$" + "1");
var view = self.getElement(viewId);
var postName = "_Class";
if (view==null && viewId && viewId.lastIndexOf(postName)!=-1) {
view = self.getElement(viewId.replace(postName, ""));
}
return view;
}
self.getViewIndex = function(view) {
var viewIds = self.getViewIds();
var id = view ? view.id : null;
var index = id && viewIds ? viewIds.indexOf(id) : -1;
return index;
}
self.syncronizeViewToURL = function() {
var fragment = self.getHashFragment();
if (self.showByMediaQuery) {
var stateName = fragment;
if (stateName==null || stateName=="") {
var initialView = self.getInitialView();
stateName = initialView ? self.getStateNameByViewId(initialView.id) : null;
}
self.showMediaQueryViewsByState(stateName);
return;
}
var view = self.getViewById(fragment);
var index = view ? self.getViewIndex(view) : 0;
if (index==-1) index = 0;
var currentView = self.hideViews(index);
if (self.supportsPopState && currentView) {
if (fragment==null) {
window.history.replaceState({name:currentView.id}, null, "#"+ currentView.id);
}
else {
window.history.pushState({name:currentView.id}, null, "#"+ currentView.id);
}
}
self.setViewVariables(view);
return view;
}
/**
* Set the currentView or currentOverlay properties and set the lastView or lastOverlay properties
*/
self.setViewVariables = function(view, overlay, parentView) {
if (view) {
if (self.currentView) {
self.lastView = self.currentView;
}
self.currentView = view;
}
if (overlay) {
if (self.currentOverlay) {
self.lastOverlay = self.currentOverlay;
}
self.currentOverlay = overlay;
}
}
self.getViewPreferenceBoolean = function(view, property, altValue) {
var computedStyle = window.getComputedStyle(view);
var value = computedStyle.getPropertyValue(property);
var type = typeof value;
if (value=="true" || (type=="string" && value.indexOf("true")!=-1)) {
return true;
}
else if (value=="" && arguments.length==3) {
return altValue;
}
return false;
}
self.getViewPreferenceValue = function(view, property, defaultValue) {
var value = window.getComputedStyle(view).getPropertyValue(property);
if (value===undefined) {
return defaultValue;
}
value = value.replace(/^[\s\"]*/, "");
value = value.replace(/[\s\"]*$/, "");
value = value.replace(/^[\s"]*(.*?)[\s"]*$/, function (match, capture) {
return capture;
});
return value;
}
self.getStyleRuleValue = function(cssRule, property) {
var value = cssRule ? cssRule.style.getPropertyValue(property) : null;
if (value===undefined) {
return null;
}
value = value.replace(/^[\s\"]*/, "");
value = value.replace(/[\s\"]*$/, "");
value = value.replace(/^[\s"]*(.*?)[\s"]*$/, function (match, capture) {
return capture;
});
return value;
}
/**
* Get the first defined value of property. Returns empty string if not defined
* @param {String} id id of element
* @param {String} property
*/
self.getCSSPropertyValueForElement = function(id, property) {
var styleSheets = document.styleSheets;
var numOfStylesheets = styleSheets.length;
var values = [];
var selectorIDText = "#" + id;
var selectorClassText = "." + id + "_Class";
var value;
for(var i=0;i<numOfStylesheets;i++) {
var styleSheet = styleSheets[i];
var cssRules = self.getStylesheetRules(styleSheet);
var numOfCSSRules = cssRules.length;
var cssRule;
for (var j=0;j<numOfCSSRules;j++) {
cssRule = cssRules[j];
if (cssRule.media) {
var mediaRules = cssRule.cssRules;
var numOfMediaRules = mediaRules ? mediaRules.length : 0;
for(var k=0;k<numOfMediaRules;k++) {
var mediaRule = mediaRules[k];
if (mediaRule.selectorText==selectorIDText || mediaRule.selectorText==selectorClassText) {
if (mediaRule.style && mediaRule.style.getPropertyValue(property)!="") {
value = mediaRule.style.getPropertyValue(property);
values.push(value);
}
}
}
}
else {
if (cssRule.selectorText==selectorIDText || cssRule.selectorText==selectorClassText) {
if (cssRule.style && cssRule.style.getPropertyValue(property)!="") {
value = cssRule.style.getPropertyValue(property);
values.push(value);
}
}
}
}
}
return values.pop();
}
self.getIsStyleDefined = function(id, property) {
var value = self.getCSSPropertyValueForElement(id, property);
return value!==undefined && value!="";
}
self.collectViews = function() {
var viewIds = self.getViewIds();
for (let index = 0; index < viewIds.length; index++) {
const id = viewIds[index];
const view = self.getElement(id);
self.views[id] = view;
}
self.viewIds = viewIds;
}
self.collectOverlays = function() {
var viewIds = self.getViewIds();
var ids = [];
for (let index = 0; index < viewIds.length; index++) {
const id = viewIds[index];
const view = self.getViewById(id);
const isOverlay = view && self.isOverlay(view);
if (isOverlay) {
ids.push(id);
self.overlays[id] = view;
}
}
self.overlayIds = ids;
}
self.collectMediaQueries = function() {
var viewIds = self.getViewIds();
var styleSheet = self.getApplicationStylesheet();
var cssRules = self.getStylesheetRules(styleSheet);
var numOfCSSRules = cssRules ? cssRules.length : 0;
var cssRule;
var id = viewIds.length ? viewIds[0]: ""; // single view
var selectorIDText = "#" + id;
var selectorClassText = "." + id + "_Class";
var viewsNotFound = viewIds.slice();
var viewsFound = [];
var selectorText = null;
var property = self.prefix + "view-id";
var stateName = self.prefix + "state";
var stateValue = null;
var view = null;
for (var j=0;j<numOfCSSRules;j++) {
cssRule = cssRules[j];
if (cssRule.media) {
var mediaRules = cssRule.cssRules;
var numOfMediaRules = mediaRules ? mediaRules.length : 0;
var mediaViewInfoFound = false;
var mediaId = null;
for(var k=0;k<numOfMediaRules;k++) {
var mediaRule = mediaRules[k];
selectorText = mediaRule.selectorText;
if (selectorText==".mediaViewInfo" && mediaViewInfoFound==false) {
mediaId = self.getStyleRuleValue(mediaRule, property);
stateValue = self.getStyleRuleValue(mediaRule, stateName);
selectorIDText = "#" + mediaId;
selectorClassText = "." + mediaId + "_Class";
view = self.getElement(mediaId);
// prevent duplicates from load and domcontentloaded events
if (self.addedViews.indexOf(mediaId)==-1) {
self.addView(view, mediaId, cssRule, mediaRule, stateValue);
}
viewsFound.push(mediaId);
if (viewsNotFound.indexOf(mediaId)!=-1) {
viewsNotFound.splice(viewsNotFound.indexOf(mediaId));
}
mediaViewInfoFound = true;
}
if (selectorIDText==selectorText || selectorClassText==selectorText) {
var styleObject = self.viewsDictionary[mediaId];
if (styleObject) {
styleObject.styleDeclaration = mediaRule;
}
break;
}
}
}
else {
selectorText = cssRule.selectorText;
if (selectorText==null) continue;
selectorText = selectorText.replace(/[#|\s|*]?/g, "");
if (viewIds.indexOf(selectorText)!=-1) {
view = self.getElement(selectorText);
self.addView(view, selectorText, cssRule, null, stateValue);
if (viewsNotFound.indexOf(selectorText)!=-1) {
viewsNotFound.splice(viewsNotFound.indexOf(selectorText));
}
break;
}
}
}
if (viewsNotFound.length) {
console.log("Could not find the following views:" + viewsNotFound.join(",") + "");
console.log("Views found:" + viewsFound.join(",") + "");
}
}
/**
* Adds a view
* @param {HTMLElement} view view element
* @param {String} id id of view element
* @param {CSSRule} cssRule of view element
* @param {CSSMediaRule} mediaRule media rule of view element
* @param {String} stateName name of state if applicable
**/
self.addView = function(view, viewId, cssRule, mediaRule, stateName) {
var viewData = {};
viewData.name = viewId;
viewData.rule = cssRule;
viewData.id = viewId;
viewData.mediaRule = mediaRule;
viewData.stateName = stateName;
self.views.push(viewData);
self.addedViews.push(viewId);
self.viewsDictionary[viewId] = viewData;
self.mediaQueryDictionary[viewId] = cssRule;
}
self.hasView = function(name) {
if (self.addedViews.indexOf(name)!=-1) {
return true;
}
return false;
}
/**
* Go to view by id. Views are added in addView()
* @param {String} id id of view in current
* @param {Boolean} maintainPreviousState if true then do not hide other views
* @param {String} parent id of parent view
**/
self.goToView = function(id, maintainPreviousState, parent) {
var state = self.viewsDictionary[id];
if (state) {
if (maintainPreviousState==false || maintainPreviousState==null) {
self.hideViews();
}
self.enableMediaQuery(state.rule);
self.updateViewLabel();
self.updateURL();
}
else {
var event = new Event(self.STATE_NOT_FOUND);
self.stateName = id;
window.dispatchEvent(event);
}
}
/**
* Go to the view in the event targets CSS variable
**/
self.goToTargetView = function(event) {
var button = event.currentTarget;
var buttonComputedStyles = getComputedStyle(button);
var actionTargetValue = buttonComputedStyles.getPropertyValue(self.prefix+"action-target").trim();
var animation = buttonComputedStyles.getPropertyValue(self.prefix+"animation").trim();
var targetType = buttonComputedStyles.getPropertyValue(self.prefix+"action-type").trim();
var targetView = self.application ? null : self.getElement(actionTargetValue);
var targetState = targetView ? self.getStateNameByViewId(targetView.id) : null;
var actionTargetStyles = targetView ? targetView.style : null;
var state = self.viewsDictionary[actionTargetValue];
// navigate to page
if (self.application==false || targetType=="page") {
document.location.href = "./" + actionTargetValue;
return;
}
// if view is found
if (targetView) {
if (self.currentOverlay) {
self.removeOverlay(false);
}
if (self.showByMediaQuery) {
var stateName = targetState;
if (stateName==null || stateName=="") {
var initialView = self.getInitialView();
stateName = initialView ? self.getStateNameByViewId(initialView.id) : null;
}
self.showMediaQueryViewsByState(stateName, event);
return;
}
// add animation set in event target style declaration
if (animation && self.supportAnimations) {
self.crossFade(self.currentView, targetView, false, animation);
}
else {
self.setViewVariables(self.currentView);
self.hideViews();
self.enableMediaQuery(state.rule);
self.scaleViewIfNeeded(targetView);
self.centerView(targetView);
self.updateViewLabel();
self.updateURL();
}
}
else {
var stateEvent = new Event(self.STATE_NOT_FOUND);
self.stateName = name;
window.dispatchEvent(stateEvent);
}
event.stopImmediatePropagation();
}
/**
* Cross fade between views
**/
self.crossFade = function(from, to, update, animation) {
var targetIndex = to.parentNode
var fromIndex = Array.prototype.slice.call(from.parentElement.children).indexOf(from);
var toIndex = Array.prototype.slice.call(to.parentElement.children).indexOf(to);
if (from.parentNode==to.parentNode) {
var reverse = self.getReverseAnimation(animation);
var duration = self.getAnimationDuration(animation, true);
// if target view is above (higher index)
// then fade in target view
// and after fade in then hide previous view instantly
if (fromIndex<toIndex) {
self.setElementAnimation(from, null);
self.setElementAnimation(to, null);
self.showViewByMediaQuery(to);
self.fadeIn(to, update, animation);
setTimeout(function() {
self.setElementAnimation(to, null);
self.setElementAnimation(from, null);
self.hideView(from);
self.updateURL();
self.setViewVariables(to);
self.updateViewLabel();
}, duration)
}
// if target view is on bottom
// then show target view instantly
// and fade out current view
else if (fromIndex>toIndex) {
self.setElementAnimation(to, null);
self.setElementAnimation(from, null);
self.showViewByMediaQuery(to);
self.fadeOut(from, update, reverse);
setTimeout(function() {
self.setElementAnimation(to, null);
self.setElementAnimation(from, null);
self.hideView(from);
self.updateURL();
self.setViewVariables(to);
}, duration)
}
}
}
self.fadeIn = function(element, update, animation) {
self.showViewByMediaQuery(element);
if (update) {
self.updateURL(element);
element.addEventListener("animationend", function(event) {
element.style.animation = null;
self.setViewVariables(element);
self.updateViewLabel();
element.removeEventListener("animationend", arguments.callee);
});
}
self.setElementAnimation(element, null);
element.style.animation = animation;
}
self.fadeOutCurrentView = function(animation, update) {
if (self.currentView) {
self.fadeOut(self.currentView, update, animation);
}
if (self.currentOverlay) {
self.fadeOut(self.currentOverlay, update, animation);
}
}
self.fadeOut = function(element, update, animation) {
if (update) {
element.addEventListener("animationend", function(event) {
element.style.animation = null;
self.hideView(element);
element.removeEventListener("animationend", arguments.callee);
});
}
element.style.animationPlayState = "paused";
element.style.animation = animation;
element.style.animationPlayState = "running";
}
self.getReverseAnimation = function(animation) {
if (animation && animation.indexOf("reverse")==-1) {
animation += " reverse";
}
return animation;
}
/**
* Get duration in animation string
* @param {String} animation animation value
* @param {Boolean} inMilliseconds length in milliseconds if true
*/
self.getAnimationDuration = function(animation, inMilliseconds) {
var duration = 0;
var expression = /.+(\d\.\d)s.+/;
if (animation && animation.match(expression)) {
duration = parseFloat(animation.replace(expression, "$" + "1"));
if (duration && inMilliseconds) duration = duration * 1000;
}
return duration;
}
self.setElementAnimation = function(element, animation, priority) {
element.style.setProperty("animation", animation, "important");
}
self.getElement = function(id) {
id = id ? id.trim() : id;
var element = id ? document.getElementById(id) : null;
return element;
}
self.getElementById = function(id) {
id = id ? id.trim() : id;
var element = id ? document.getElementById(id) : null;
return element;
}
self.getElementByClass = function(className) {
className = className ? className.trim() : className;
var elements = document.getElementsByClassName(className);
return elements.length ? elements[0] : null;
}
self.resizeHandler = function(event) {
if (self.showByMediaQuery) {
if (self.enableDeepLinking) {
var stateName = self.getHashFragment();
if (stateName==null || stateName=="") {
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<div id="SA_faces_two_big_property_prob">
<span>SA faces two big property problems:
Can one problem solve the other in the drive for affordable housing?</span>
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<div id="By_Chris_Campbell_CEO_Consulti">
<span>By Chris Campbell, CEO, Consulting Engineers South Africa<br/><br/>If you take a drive through South Africa’s metropolitan areas today, you might be startled by the sheer number of ‘To Let’ signs seen at office park entrances and multi-storey buildings. Vacant offices seem to be a permanent consequence of the pandemic, with companies showing little enthusiasm for a full return to the traditional office working environment. This is of course understandable from a cost saving perspective, however, I would argue that the trade off between reduced rental costs and employee wellbeing, employee productivity and the need for maintaining cohesive teams of employees, has not been measured sufficiently well enough to have the scales tilted in favour of mere cost saving through reduced office rental. <br/><br/>On the other hand, while offices stand vacant, there is a severe shortage of affordable housing – especially in areas with good economic activity. Never has the expression, “when life gives you lemons, learn to make lemonade” been more fitting of this situation. Why not make greater use of our excess of rentable office space, and convert it into housing ? And I mean affordable housing, not penthouse luxury apartments (which seems to be the direction many property developers are going in). I quite understand the need to recoup costs for investing in such developments and the long term investment value that would have driven the pursuit of such developments in the first place. What to do though when your office park is less than 50% occupied and could possibly remain that way for the foreseeable future. <br/><br/>South Africa doesn’t need more luxury apartments. We need to provide affordable housing that is accessible to many, that does not compromise on quality and location in respect of the proximity to the workplace as has been the legacy of residential development in the country. Let’s not confuse affordable with low cost, as the cost recovery dynamics will differ significantly. This differentiation is not new and is already catered for in many of the national residential policy provisions. Empty offices pose an excellent opportunity for dealing with our housing shortage, and I implore our government to consider this opportunity and take another look at the National Infrastructure Plan 2050, crafted before the Covid -19 pandemic and factor in potential policy changes that could facilitate the repurposing of such vacant office complexes as a solution for the shortage in affordable housing. <br/><br/>Of course, things are not as simple as we would like them to be. Mixed income development has unfortunately always been met with much resistance. We are unfortunately still largely an unequal society and being ranked as a Country with the highest the Gini coefficient, globally, is certainly not something to be proud of. With an ailing economy and many years of waste, pillaging and lost opportunity behind us, hopefully that is, unfortunately though this reality is not going to change any time soon. It is going to take significant economic growth for this to happen. In seeking interim solutions to our shortage of housing though, we must consider that not every vacant office sits in the heart of Sandton City. There are properties from Kyalami to Edenvale, Muldersdrift to Alberton in Gauteng, that stand in prime locations for families in search of affordable, well-positioned homes. The same is true in many of our metropolitan areas across the Country. <br/><br/>And if we don’t take up this opportunity, what are the consequences? Well, we already know. One only needs to look at what became of the Joburg CBD with the urban decay that resulted from the long period of inaction following the mass migration of private sector companies from the CBD in the early to mid 90’s. Though much conversion has taken place to repurpose these, many such buildings still remain empty and have become virtually irreparable. Whilst this phenomenon might not be as prevalent in other major city centres, it certainly is avoidable, if addressed proactively and early enough. <br/><br/>Indeed, we must learn from our past and respond quickly to South Africa’s changing landscape. Consulting Engineers South Africa – which is celebrating its 70 years of Partnering for Engineering Excellence this year – proudly has over 580 consulting engineering organisations as members employing in excess of 17 000 people. I am confident that together we can offer the expertise to assist in the smooth transition of offices into housing. I invite government and private sector developers to call on us as a key player to the re-engineering efforts that would have to go into this process. The National Infrastructure Plan 2050 may not mention housing and all of its challenges, but it certainly acknowledges the power of public-private partnerships in reaching our country’s goals. </span><br/>
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<div id="Disclaimer__This_publication_i">
<span>Disclaimer<br/></span><br/><span style="font-style:normal;font-weight:normal;font-size:12px;">This publication is an attempt to share information of interest with members and readers. Articles on products and ideas featured in this publication from other sources do not of necessity carry the endorsement of CESA unless explicitly so indicated.<br/><br/>CE-track Contributions:<br/>Email or phone Bonolo Nkgodi at bonolo@cesa.co.za or 011 463 2022 to contribute news, comment etc.<br/>Copyright © CESA 2022</span>
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