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window.onload in self invoking function

 
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I have a self invoking function with a window.onload in it. But the window.onload is not really called after windows is loaded. Often, myBtn returns null as the chrome-debugger says

"Uncaught TypeError: Cannot set property 'onclick' of null".

Why is that so? How can I solve that?





Using jquery and this script returns the same error:






I have put the script into the head-element.

I know, that document.ready will run immediately after DOM is built.
Self-invoking functions will run instantly - but window-onload should, normally should run after dom is built.
But this is not the case. Why?
 
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In both cases it means that you do not have a single element on the page with that id.

Eric
 
nimo frey
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I was so blind! You are right!

I am using jsf with templating and had something like this <ui:remove>

within the tags which was called by javascript.

So that was the reason.

Thanks !!
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