How to check if iframe is empty/null/undefined?

Question

This doesn\'t work:

if(document.getElementById(\"iframe\").innerHTML==\'\'){

Is there a safe browser reliable way to check an iframe if its

Answer 1

Check the frame's contentDocument property. IE 7 and earlier support the contentWindow property instead, but there is a simple cross browser example at http://www.w3schools.com/jsref/prop_frame_contentdocument.asp.

A less-reliable method but might be what you want... check the src property.

You can read about other frame properties at http://www.w3schools.com/jsref/dom_obj_frame.asp