Prevent multiple event handlers on same element.

[Ranadhir Nag]

We are attachign to a new window to listen to events on that window:

winHandle=window.open("....jsp");
if( window.attachEvent ) {
winHandle.document.attachEvent('onclick',detectType);
winHandle.document.attachEvent('onkeyup',detectType);}
In the detectType function, we attach and eventhandle to the individual element,based on the element type

function detectType (e)
{
var targ;
if (!e) var e=winHandle.event;
if (e.target){targ=e.target;}
else if(e.srcElement){targ=e.srcElement;}
if (targ.nodeType==3){targ=targ.parentNode;}

var tagName=targ.tagName;

switch(tagName)
{
......
case "INPUT":
targ.attachEvent("ondeactivate",capturecontent);
break;
default:
targ.attachEvent("onblur",capturecontent);
break;

}
...
}

Now in some cases,both the mouse and kep events would fire and cause the event handler to be attached twice.
Is ther some way to detect if an event handler has already been attached,to avoid re-attaching it?

[Eric Pascarello]

if(.....eventHandler)alert("hi");


Eric

[Ranadhir Nag]

Hi Eric,
i could not understand the answer.

[ankur rathi]

I think, if you want to have single event for an element then use this method for attaching events:

element.onClickCHANGED = do;

:roll:

[Eric Pascarello]

if(document.getElementById("foo").onclick)alert("I have an onclick event");

[Ranadhir Nag]

true,but this identifies only the ones which i define inline(within the script).
Thid would not identify the one in a separate javascript file through attachevent/addeventhandler model,isnt it?

[ankur rathi]

Originally posted by Ranadhir Nag:
true,but this identifies only the ones which i define inline(within the script).
Thid would not identify the one in a separate javascript file through attachevent/addeventhandler model,isnt it?

I think, you can't get the function name associated with the event in case of advanced model of event attachment.

[Eric Pascarello]

All I can say is have you actually tried it or are you assuming it?

Eric