Question

Google chrome gives this javascript error

Uncaught TypeError: Object javascript:__doPostBack('ctl00$MainContentPlaceHolder$lnkBtnHidden','') has no method 'click'

while executing this line

window.opener.document.getElementById('ctl00_MainContentPlaceHolder_lnkBtnHidden').click();

I have verified that the control is in the opener page and that the ID of the button is same as well, but window.opener.document.getElementById('ctl00_MainContentPlaceHolder_lnkBtnHidden') returns this, rather than an object:

javascript:__doPostBack('ctl00$MainContentPlaceHolder$lnkBtnHidden','')

This happens only in Chrome…

EDIT: The code used to open the window is like this:

win= window.open('/PageName.aspx?qs=qsValue','','scrollbars=1,width=1000,height=950');
win.moveTo(0,0);

Answer 1

Don’t be confused by the returned

    
javascript:__doPostBack('ctl00$MainContentPlaceHolder$lnkBtnHidden','') 

some browsers use the href-attribute of an hyperlink as a string-representation of the <a/>-element.
The returned object still is the element-object.

I already wrote inside the comment that click() in (my) Chrome doesn’t work on a-elements. It works for me in input[type=submit] , but maybe your chrome-version doesn’t support it. But that doesn’t matter as long as you can’t rely on the fact that click() works anywhere.

When your approach by using dispatchEvent() doesn’t work, I guess your implementation is wrong, here an example-function:

//@param obj element where to simulate the click
function simclick(obj)
{

  if(document.fireEvent) {
    obj.fireEvent("onclick"); 

    }
   else if(document.dispatchEvent) { 
    var oEvent = document.createEvent( "MouseEvents" );
    oEvent.initMouseEvent("click", true, true,window, 1, 1, 1, 1, 1, false, false, false, false, 0, obj);
    obj.dispatchEvent( oEvent );
    } 
}

What else: you should move the call of javascript:__doPostBack() from the href-attribute to the onclick-attribute. Otherwise there is no guarantee that the function gets called(depending on the browser).

see an example: http://fiddle.jshell.net/doktormolle/swR59/show/
opener-source: http://jsfiddle.net/doktormolle/swR59/
popup-source: http://jsfiddle.net/doktormolle/vHwCr/