Get a controls full ClientID from just ID in asp.net (client side)

This problem is the bane of my asp.net coding life.

I have a control, in code, and I want to get its full ClientID but I cannot until I add it to the page.

However I cannot add it to the page yet. I want to add some javascript to the onclick.

I can add something like "myMethod(this)" to the onclick, which is great and sidesteps the problem, but if I want a select all button for example, that runs "myMethod(theItem); myMethod(theItem2); myMethod(theItem3)" then I can no longer use 'this'.

I can't do "myMethod(document.getElementByID('" + myObject.ClientID + "'))'" or whatever either,开发者_StackOverflow because the ClientID isn't set yet.

So is there a javascript method that I can paste into my page that will find the element from its ID (ClientID and ID are the same before it is added to the page)?

You can add it to the page then add the javascript. As long as you still have a reference to the control, you can put it wherever, then any updates will happen to it in-place.