document.execCommand在firefox addon-sdk中导致错误

Question

I'm developing a Firefox extension using Firefox addon-sdk. One of my content scripts is trying to insert some text into an editable div by using this standard javascript function:

document.execCommand("InsertHTML", false, 'test text');

The above code works perfectly in my Chrome extension but fails in Firefox with this error:

[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMHTMLDocument.execCommand]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" data: no]

Is there any other solution to insert text at the current position into an editable div(in a content script).

Thanks in advance

Answer 1

In my first glance, the function doesn't exist, resp. is not accessible:

Either due to NOT making the WHOLE doc editable (at least FF 3.5.13 shows that behaveiour) resp. 'midas' not invoked OR a timing problem: the invoke of midas may take some (100?) millisec. In the case editability is triggerd by script or otherwise after load of page, one should await the 'appearence' of the function (of the DOCUMENT).execCommand as midas load-completion succeeds.