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Ability to cancel future events on return false / Avoid generating keyframe selectors with same id #3

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Ability to cancel future events on return false / Avoid generating keyframe selectors with same id #3

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266ce37
Ability to cancel future events on return false
riyazshaikh Oct 13, 2015
c09e85f
Avoid generating keyframe selectors with same id
riyazshaikh Oct 13, 2015
d6499f2
Some improvements
riyazshaikh Nov 23, 2015
338479f
fix for IE
riyazshaikh Feb 9, 2016
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31 changes: 22 additions & 9 deletions selector-listeners.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,24 +2,31 @@

var events = {},
selectors = {},
docProto = typeof HTMLDocument !== 'undefined' ? HTMLDocument.prototype : Document.prototype,
elemProto = typeof HTMLElement !== 'undefined' ? HTMLElement.prototype : Element.prototype,
styles = document.createElement('style'),
keyframes = document.createElement('style'),
head = document.getElementsByTagName('head')[0],
startNames = ['animationstart', 'oAnimationStart', 'MSAnimationStart', 'webkitAnimationStart'],
startEvent = function(event){
event.selector = (events[event.animationName] || {}).selector;
var removeList = [];
((this.selectorListeners || {})[event.animationName] || []).forEach(function(fn){
fn.call(this, event);
if (fn.call(this, event) === false) removeList.push(fn);
}, this);
removeList.forEach(function(fn) {
this.removeSelectorListener(event.selector, fn);
}, this);
},
prefix = (function() {
var duration = 'animation-duration: 0.001s;',
name = 'animation-name: SelectorListener !important;',
visibility = 'visibility:hidden;',
computed = window.getComputedStyle(document.documentElement, ''),
pre = (Array.prototype.slice.call(computed).join('').match(/moz|webkit|ms/)||(computed.OLink===''&&['o']))[0];
return {
css: '-' + pre + '-',
properties: '{' + duration + name + '-' + pre + '-' + duration + '-' + pre + '-' + name + '}',
properties: '{' + visibility + duration + name + '-' + pre + '-' + duration + '-' + pre + '-' + name + '}',
keyframes: !!(window.CSSKeyframesRule || window[('WebKit|Moz|MS|O').match(new RegExp('(' + pre + ')', 'i'))[1] + 'CSSKeyframesRule'])
};
})();
Expand All @@ -28,19 +35,20 @@
head.appendChild(styles);
head.appendChild(keyframes);

HTMLDocument.prototype.addSelectorListener = HTMLElement.prototype.addSelectorListener = function(selector, fn){
docProto.addSelectorListener = elemProto.addSelectorListener = function(selector, fn){
var key = selectors[selector],
listeners = this.selectorListeners = this.selectorListeners || {};

if (key) events[key].count++;
else {
key = selectors[selector] = 'SelectorListener-' + new Date().getTime();
key = selectors[selector] = 'SelectorListener-' + Math.random().toString(16).substr(2, 9);
var node = document.createTextNode('@' + (prefix.keyframes ? prefix.css : '') + 'keyframes ' + key + ' {'
+'from { outline-color: #fff; } to { outline-color: #000; }'
+ '}');
keyframes.appendChild(node);
styles.sheet.insertRule(selector + prefix.properties.replace(/SelectorListener/g, key), 0);
events[key] = { count: 1, selector: selector, keyframe: node, rule: styles.sheet.cssRules[0] };
var rule = document.createTextNode(selector + prefix.properties.replace(/SelectorListener/g, key));
styles.appendChild(rule);
events[key] = { count: 1, selector: selector, keyframe: node, rule: rule };
}

if (listeners.count) listeners.count++;
Expand All @@ -54,7 +62,7 @@
(listeners[key] = listeners[key] || []).push(fn);
};

HTMLDocument.prototype.removeSelectorListener = HTMLElement.prototype.removeSelectorListener = function(selector, fn){
docProto.removeSelectorListener = elemProto.removeSelectorListener = function(selector, fn){
var listeners = this.selectorListeners || {},
key = selectors[selector],
listener = listeners[key] || [],
Expand All @@ -64,7 +72,7 @@
var event = events[selectors[selector]];
event.count--;
if (!event.count){
styles.sheet.deleteRule(styles.sheet.cssRules.item(event.rule));
styles.removeChild(event.rule);
keyframes.removeChild(event.keyframe);
delete events[key];
delete selectors[selector];
Expand All @@ -77,5 +85,10 @@
}, this);
}
};


// Single invocation version
HTMLDocument.prototype.onSelector = HTMLElement.prototype.onSelector = function(selector,fn) {
this.addSelectorListener(selector, function(event) { fn(event); return false; });
};

})();