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| /* | |
| --- | |
| name: Element.Event.Change | |
| description: Contains Element methods for normalizing change events across browsers. | |
| license: MIT-style license. | |
| requires: [Element, Event] | |
| provides: Element.Event.Change | |
| ... | |
| */ | |
| (function(){ | |
| var hasListener = window.addEventListener; | |
| var getValue = function(element){ | |
| var type = element.get('type'); | |
| return element[type == 'radio' || type == 'checkbox' ? 'checked' : 'value']; | |
| } | |
| var storeChange = function(event){ | |
| event.target.store('$change', { | |
| type: event.type, | |
| value: getValue(event.target) | |
| }); | |
| }; | |
| var hasChanged = function(element){ | |
| var value = element.retrieve('$change').value; | |
| return (value != null && value != getValue(element)); | |
| }; | |
| var keychange = function(event){ | |
| var target = event.target; | |
| if (!hasChanged(target)) return false; | |
| if (target.get('tag') == 'select') return true; | |
| if (!hasListener) switch(event.key){ | |
| case 'up': case 'down': case 'left': case 'right': return target.get('type') == 'radio'; | |
| case 'space': return target.get('type') == 'checkbox'; | |
| } | |
| } | |
| Element.Events.change = { | |
| base: function(){ | |
| var type = this.get('type'); | |
| return (!hasListener && (type == 'checkbox' || type == 'radio')) ? 'click' : 'change'; | |
| }, | |
| condition: function(event){ | |
| var target = event.target; | |
| if (hasListener && event.type == 'change' && target.get('tag') == 'select' && target.retrieve('$change').type == 'keydown') return false; | |
| return target.get('type') == 'radio' ? (event.type == 'keyup' ? !target.checked : target.checked) : true; | |
| }, | |
| onAdd: function(fn){ | |
| this.addEvents({ | |
| keyup: function(event){ | |
| if (keychange(event)) fn.call(this, event); | |
| }, | |
| focus: storeChange, | |
| keydown: storeChange | |
| }); | |
| }, | |
| onRemove: function(fn){ | |
| this.removeEvents({ | |
| keyup: function(event){ | |
| if (keychange(event)) fn.call(this, event); | |
| }, | |
| focus: storeChange, | |
| keydown: storeChange | |
| }); | |
| } | |
| } | |
| })(); |
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