Call the click event of a ASP.NET button from another form

make that button click event as publick...then call like this..
  btnSave_Click(sender, e);

document.getElementById('btnId').click();

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from the child window (triggering click on parent window):

opener.document.getElementById('btnId').click();

from the parent window, if you have opened a window like this:

var wnd = window.open('url');

then use:

wnd.document.getElementById('btnId').click();

The child window is a popup and I display it using window.showModalDialog.

I tried opener.document.getElementById('btnId').click()  and  wnd.document.getElementById('btnId').click()   and neither seems to work, unless I am doing something wrong.   There is an accept button on the popup that does self.close().   When accept is click, this is where I want to trigger a refresh button click on the page from which i opened the popup?



Question:  How does it know to look for the button on the parent page and not on the popup?

window.opener.document.getElementById('btnId').click()

should work when called from the popup before calling self.close

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I tried this.  it does not seem to work.  The button ID.  How does the codue know which page the button is on?  

well when you say window.opener it means the parent window. try adding a function in the parent and calling that.

e.g.

parent page:
function testCall() {
   alert('comes here');
}

popup page:
window.opener.testCall();

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I found my problem - I need to reference the ASP button like this:

var RefreshButton= window.document.getElementById("<%= Unidentified_DocumentsRefreshButton.ClientID %>");

What's the deal with the  <%= %> syntax?  What does that tell the JavaScript interpreter?  Do you know if I always need this syntax?

Thanks for the explanation!