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// written by Dean Edwards, 2005
// with input from Tino Zijdel
// http://dean.edwards.name/weblog/2005/10/add-event/
function addEvent(element, type, handler) {
// assign each event handler a unique ID
if (!handler.$$guid) handler.$$guid = addEvent.guid++;
// create a hash table of event types for the element
if (!element.events) element.events = {};
// create a hash table of event handlers for each element/event pair
var handlers = element.events[type];
if (!handlers) {
handlers = element.events[type] = {};
// store the existing event handler (if there is one)
if (element["on" + type]) {
handlers[0] = element["on" + type];
}
}
// store the event handler in the hash table
handlers[handler.$$guid] = handler;
// assign a global event handler to do all the work
element["on" + type] = handleEvent;
};
// a counter used to create unique IDs
addEvent.guid = 1;
function removeEvent(element, type, handler) {
// delete the event handler from the hash table
if (element.events && element.events[type]) {
delete element.events[type][handler.$$guid];
}
};
function handleEvent(event) {
var returnValue = true;
// grab the event object (IE uses a global event object)
event = event || fixEvent(window.event);
// get a reference to the hash table of event handlers
var handlers = this.events[event.type];
// execute each event handler
for (var i in handlers) {
if (!handlers.hasOwnProperty(i)) continue;
this.$$handleEvent = handlers[i];
if (this.$$handleEvent(event) === false) {
returnValue = false;
}
}
return returnValue;
};
function fixEvent(event) {
// add W3C standard event methods
event.preventDefault = fixEvent.preventDefault;
event.stopPropagation = fixEvent.stopPropagation;
// fix target
event.target = event.srcElement;
return event;
};
fixEvent.preventDefault = function() {
this.returnValue = false;
};
fixEvent.stopPropagation = function() {
this.cancelBubble = true;
};
/**
* Pseudo event handler to be fired after the DOM was parsed or
* on window load at last.
*
* @author based upon some code by Dean Edwards
* @author Dean Edwards
* @link http://dean.edwards.name/weblog/2006/06/again/
*/
window.fireoninit = function() {
// quit if this function has already been called
if (arguments.callee.done) return;
// flag this function so we don't do the same thing twice
arguments.callee.done = true;
// kill the timer
if (_timer) {
clearInterval(_timer);
_timer = null;
}
if (typeof window.oninit == 'function') {
window.oninit();
}
};
/**
* Run the fireoninit function as soon as possible after
* the DOM was loaded, using different methods for different
* Browsers
*
* @author Dean Edwards
* @link http://dean.edwards.name/weblog/2006/06/again/
*/
// for Mozilla
if (document.addEventListener) {
document.addEventListener("DOMContentLoaded", window.fireoninit, null);
}
// for Internet Explorer (using conditional comments)
/*@cc_on @*/
/*@if (@_win32)
document.write("<scr" + "ipt id=\"__ie_init\" defer=\"true\" src=\"//:\"><\/script>");
var script = document.getElementById("__ie_init");
script.onreadystatechange = function() {
if (this.readyState == "complete") {
window.fireoninit(); // call the onload handler
}
};
/*@end @*/
// for Safari
if (/WebKit/i.test(navigator.userAgent)) { // sniff
var _timer = setInterval(function() {
if (/loaded|complete/.test(document.readyState)) {
window.fireoninit(); // call the onload handler
}
}, 10);
}
// for other browsers
window.onload = window.fireoninit;
/**
* This is a pseudo Event that will be fired by the fireoninit
* function above.
*
* Use addInitEvent to bind to this event!
*
* @author Andreas Gohr <andi@splitbrain.org>
* @see fireoninit()
*/
window.oninit = function(){};
/**
* Bind a function to the window.init pseudo event
*
* @author Simon Willison
* @see http://simon.incutio.com/archive/2004/05/26/addLoadEvent
*/
function addInitEvent(func) {
var oldoninit = window.oninit;
if (typeof window.oninit != 'function') {
window.oninit = func;
} else {
window.oninit = function() {
oldoninit();
func();
};
}
}
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