execCommand give error

Question

I create a new iframe then append it to the main window document and execute this javascript:

frame.contentDocument.execCommand('insertimage',0,'obama.jpg');

Where frame is the iframe element. Unfortunatey I get this error:

Error: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMHTMLDocument.execCommand]

How can I enable execCommand() function in an iframe? Is there something missing?

Answer 1

The document needs to be editable. This can be done by either of the followin methods:

frame.contentDocument.designMode = 'on';           // = 'off'; to disable`
frame.contentDocument.body.contentEditable = true; // = false; to disable`

execCommand ought to be used for editable elements only. Your error indicates that this is not the case. If you want to insert a new image in the document, just use:

var img = new Image();
img.src = 'http://example.com/obama.jpg';
frame.contentDocument.appendChild(img);