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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) {
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;
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 Andreas Gohr
* @see http://dean.edwards.name/weblog/2005/09/busted/
*/
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;
if (typeof window.oninit == 'function') {
window.oninit();
}
};
/**
* This is a pseudo Event that will be fired by the above function
*
* Use addInitEvent to bind to this event!
*
* @author Andreas Gohr
*/
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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