Is it possible to emulate event capturing in Internet Explorer?
An example:
<a>one</a> <a>two</a> <a>three3</a> <script> var links = document.getElementsByTagName("A"); for (var i=0; i < links.length; i++) { links[i].onclick = function(){ alert("clicked"); }; } </script>
I want to prev开发者_StackOverflowent all these click events from firing. I can do that with a single event observer:
document.addEventListener("click", function(e) { e.stopPropagation(); e.preventDefault(); }, true);
How can I do the same in IE? IE < 9 does not support addEventListener
. It does support attachEvent
, but it doesn't have useCapture
option.
I've found setCapture method, but it doesn't look related to the W3 capturing model.
Generally you can't because of the event order. In IE the events will start bubbling from the target element without the capturing phase so you can't catch them beforehand.
There's only one thing you can do, and it's only possible if you manage all the event handlers.
- Write a wrapper for
addEvent
with capture parameter If capturing is required do the following
- Register a simple bubbling event, with a function that
- Goes all the way up the parent chain, saving all the elements to an
Array
- Travels backward this
Array
invoking the original event handler on each of the elements
The Uniform Event Model project from JavaScript Lab appears to emulate the capture phase. Go to the download page for the JSLab DOM Correction library and select everything and select the commented format. Then download the code and search it for the word 'capture'. I have not tested the library or read much of its code.
setCapture is used to retain some mouse-related action outside the browser window
and it is used to implement some kind of drag&drop
if you mousedown an element and you will go with your pointer outside the browser window the mousemove event stops to work
if you setCapture() the mousemove event will continue to work outside the browser window
https://developer.mozilla.org/en/DOM/element.setCapture
and the related method to release capture
https://developer.mozilla.org/en/DOM/document.releaseCapture
so, it has nothing in common with the capturing event model and, there's no known way to emulate it in internet explorer in a standard way!
hope this helps!
IE has a Element.setCapture() method that you may find useful http://msdn.microsoft.com/en-us/library/ms536742(v=vs.85).aspx It allows you to route all mouse events to the element that called setCapture()
function myFunction(e) {
if (!e) var e = window.object;//legacy event object
if (e.preventDefault) e.preventDefault();//prevent firing in W3C model
return false; //exit event, no firing, listener must registered to anchor tag
}
var x = document.getElementsByTagName("A");
if (x.item(0).addEventListener) {
for (var i = 0, l = x.length; i < l; i++) {
x.item(i).addEventListener("click",myFunction,false);
}
}//W3C model
else if (x.item(0).attachEvent) {
for (var i = 0, l = x.length; i < l; i++) {
x.item(i).attachEvent("onclick",myFunction);
}
}// legacy browsers
The best way if you use only bubbling for clicks:
if (document.addEventListener) document.addEventListener("click", function(e){e.preventDefault();},false);
else if (document.attachEvent) document.attachEvent("onclick", function(){window.event.returnValue = false;});
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