10.2 - How do I access a frame's content?

To reference another frame on the same domain:

The content window of a FRAME or IFRAME can be accessed by the frames collection.

Example:

  var fwin; 
  fwin = self.frames[0]; // or: 
  fwin = self.frames["iframeName"];

or, from the IFRAME or FRAME element:

  var iframeEl = document.getElementById("myFrame"); 
  // Nonstandard, but widely supported.
  var fwin = iframeEl.contentWindow; 
  // DOM2 HTML Standard. 
  var fdoc = iframeEl.contentDocument;

A global identifier moomin in the the iframe's content window is accessed as fwin.moomin.

To communicate between frames on different domains:

Where supported, (IE8, Firefox 3, Opera 9, Safari 4), use window.postMessage( message[, port], otherDomain);.

Example: http://jibbering.com/faq/example/postMessage.html

Where window.postMessage is not supported, the window.name property can be set on the other window, which can poll for updates to that property using setInterval(checkWinName, 100); where checkWinName is a function that polls to check the value of self.name.

• http://en.wikipedia.org/wiki/Same_origin_policy
• http://www-archive.mozilla.org/docs/dom/domref/dom_frame_ref5.html
• https://developer.mozilla.org/en/DOM/window.postMessage
• http://msdn.microsoft.com/en-us/library/cc197015(VS.85).aspx