Disposing dynamically created behaviors(extenders) within an update panel

[Ali Al Omairi Abu AlHassan]

Guys; As you might know, all extenders are created by calling the function $create() just on the event Sys.Application.init. And disposed by calling the function $find('_componentId_').dispose() ether on the event Sys.Application.unload (closing the page) or by updating the containing UpdatePanel. My question is; in case we create the behavior(the extender) dynamically by calling the function $create() through the client script, then how to register disposing it when the UpdatePanel is updated?

Help people,so poeple can help you.

[Ali Al Omairi Abu AlHassan]

We can achieve that by by calling the function Sys.WebForms.PageRequestManager._registerDisposeScript(); which registers the the component on updating the parent UpdatePanel just like the code below:

Sys.WebForms.PageRequestManager.getInstance()._registerDisposeScript('parentupdatepanelid', 'var component = $find("componentid"); if (component != null)component.dispose()';

The disposing script(the second argument) is executed by the function Sys.WebForms.PageRequestManager._updatePanel which is called when an UpdatePanel is updated. (the code below)

function Sys$WebForms$PageRequestManager$_updatePanel(updatePanelElement, rendering) {
for (var updatePanelID in this._scriptDisposes) {
if (this._elementContains(updatePanelElement, document.getElementById(updatePanelID))) {
var disposeScripts = this._scriptDisposes[updatePanelID];
for (var i = 0, l = disposeScripts.length; i < l; i++) {
eval(disposeScripts[i]);
}
delete this._scriptDisposes[updatePanelID];
}
}
this._destroyTree(updatePanelElement);
updatePanelElement.innerHTML = rendering;
}

I added the if statement to the disposing script because the component can be disposed before the UpdatePanel is updated so the function $find() would return a null and we would have a Null Reference Exception. So what about the behaviors that is created after ExtenderControls on the Page that have disposing scripts of '$find("_componentid_").dispose();'?

Help people,so poeple can help you.