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Cherry-pick: don't explode if an old browser can't provide element, computed style, or style property (#241) #3

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Merged
merged 1 commit into from
Jun 26, 2019
Merged

Cherry-pick: don't explode if an old browser can't provide element, computed style, or style property (#241) #3

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42 changes: 41 additions & 1 deletion src/ElementQueries.js
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Original file line number Diff line number Diff line change
Expand Up @@ -381,9 +381,49 @@
* @param {Boolean} withTracking allows and requires you to use detach, since we store internally all used elements
* (no garbage collection possible if you don not call .detach() first)
*/
this.init = function(withTracking) {
this.init = function (withTracking) {
trackingActive = typeof withTracking === 'undefined' ? false : withTracking;

var animationStart = 'animationstart';
if (typeof document.documentElement.style['webkitAnimationName'] !== 'undefined') {
animationStart = 'webkitAnimationStart';
} else if (typeof document.documentElement.style['MozAnimationName'] !== 'undefined') {
animationStart = 'mozanimationstart';
} else if (typeof document.documentElement.style['OAnimationName'] !== 'undefined') {
animationStart = 'oanimationstart';
}

document.body.addEventListener(animationStart, function (e) {
var element = e.target;
var styles = element && window.getComputedStyle(element, null);
var animationName = styles && styles.getPropertyValue('animation-name');
var requiresSetup = animationName && (-1 !== animationName.indexOf('element-queries'));

if (requiresSetup) {
element.elementQueriesSensor = new ResizeSensor(element, function () {
if (element.elementQueriesSetupInformation) {
element.elementQueriesSetupInformation.call();
}
});

var sensorStyles = window.getComputedStyle(element.resizeSensor, null);
var id = sensorStyles.getPropertyValue('min-width');
id = parseInt(id.replace('px', ''));
setupElement(e.target, idToSelectorMapping[id]);
}
});

if (!defaultCssInjected) {
cssStyleElement = document.createElement('style');
cssStyleElement.type = 'text/css';
cssStyleElement.innerHTML = '[responsive-image] > img, [data-responsive-image] {overflow: hidden; padding: 0; } [responsive-image] > img, [data-responsive-image] > img {width: 100%;}';

//safari wants at least one rule in keyframes to start working
cssStyleElement.innerHTML += '\n@keyframes element-queries { 0% { visibility: inherit; } }';
document.getElementsByTagName('head')[0].appendChild(cssStyleElement);
defaultCssInjected = true;
}

for (var i = 0, j = document.styleSheets.length; i < j; i++) {
try {
readRules(document.styleSheets[i].cssRules || document.styleSheets[i].rules || document.styleSheets[i].cssText);
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