RFLudwick wrote:
> I'm trying to tie in all of a website's event handlers in HTML to
> Prototype. I.e.
>
> <a onclick="..."></a>
>
> I can't easily strip out these event handlers from the HTML and put
> them in Javascript, but I would like to get them into Prototype's
> event handling system so they can unregister for IE, etc.
>
> I believe what I'm looking for is Event.extend(), but the
> documentation on it is minimal and it tells of extending an event
> registered in other ways. But how exactly do I retrieve the onclick
> event of a link as it is defined in HTML?
>
> ...
Doesn't sound like a good idea. Such code will be pretty complicated and
run slowly. Here is something that conceptually would work:
var code, fn, elements = document.getElementsByTagName('*');
// check each element
for (var i = 0, len = elements.length; i < len; i++) {
// check each possible event (whatever events you might find in your code)
$w('blur focus resize scroll load unload click dblclick mousedown
mouseup mousemove mouseover mouseout change reset select submit keydown
keypress keyup error').each(function(eventName) {
if (code = elements[i]['on' + eventName]) {
// replace "return false" with "Event.stop()" in function body
code = String(code).replace('return false', 'Event.stop(event)');
// create a function by evaluating the contents of the event attribute
fn = eval('function(event) { ' + code + '}');
// translate event names as needed
eventName = (eventName == 'load' : 'dom:loaded' : eventName);
// attach the event to the element
$(elements[i]).observe(eventName, fn.bindAsEventListener());
}
});
}
There may be other things to account for.
- Ken Snyder
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