How can I get an element from within a frameset frame using JavaScript?

Question

I need to access and element from within a frameset frame. For example if I have the following markup:

Answer 1

<frameset rows="33%,33%,*">
<frame id="demo" src="frame1.html"/>
<frame src="frame2.html"/>
<frame src="frame3.html"/>
</frameset>

Answer:

document.getElementById("demo").contentDocument.documentElement.innerHTML;

Answer 2

You need to get the Document object for the frame.

window.frames[1].document.getElementById('someElementId')

Answer 3

You can try using framename as well

window.frames['frame_name'].document.getElementsByName('element_name');