document.execCommand throws exception in Firefox


I want to allow users to easily save text on one of our pages to their desktop as a text file. I have a button which calls this function when clicked:

function saveAsMe(button)
      var filename="file.txt";
      var formName =;
      if (formName == "form_step_email_invite_text_initial")
      else if (formName == "form_step_email_invite_text_reminder")
      else if (formName == "form_step_email_invite_text_last")

Works like a charm in IE. But not in Firefox (I'm using v1.0.4). Throws this exception:

Error: uncaught exception: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMNSHTMLDocument.execCommand]"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: [URL] :: saveAsMe :: line 224"  data: no]

Does firefox not support document.execCommand()? Is there another method for allowing the user to save the text of a page to the file name and location of their choosing?

Thanks for your help.

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Firefox ( and all other gecko browsers ) doesnt support execCommand.

Yes, telling the user to click file -> save as

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lzagreusAuthor Commented:
OK, thanks for the prompt answer. Another thought: can I make JavaScript mimic a key press, such as Ctrl+S?
lzagreusAuthor Commented:
It's not really important to answer the key press question (unless you have the answer at your fingertips). I worked around the problem by putting a try-catch block around the call to document.execCommand(). The catch block has an alert suggesting the user either copy-and-paste the text or use file > save as.

Thanks for your help!

Sounds good. Glad I could help
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