I'm working in Firefox and trying to create a function that will copy a link's text when I press Shift+* (Numpad).

The code works in Chrome Tampermonkey usually, but for some reason it's doing nothing in Firefox.
The following error is reported in the console:

"ReferenceError: GM_setClipboard is not defined"

This is my code:

document.addEventListener( "keydown", function(i) {
    var selectLink = $('a').eq(8); // The link by index
    var targetLink = selectLink.text(); // The link text

    if (i.keyCode === 106 && i.shiftKey) // Shift+Num*
    {
        GM_setClipboard(targetLink); // Copy to clipboard
    }
});

I'm working in Firefox and trying to create a function that will copy a link's text when I press Shift+* (Numpad).

The code works in Chrome Tampermonkey usually, but for some reason it's doing nothing in Firefox.
The following error is reported in the console:

"ReferenceError: GM_setClipboard is not defined"

This is my code:

document.addEventListener( "keydown", function(i) {
    var selectLink = $('a').eq(8); // The link by index
    var targetLink = selectLink.text(); // The link text

    if (i.keyCode === 106 && i.shiftKey) // Shift+Num*
    {
        GM_setClipboard(targetLink); // Copy to clipboard
    }
});

• javascript
• jquery
• greasemonkey
• tampermonkey

• Is there any error message or something like that? What is the actual and the expected behaviour? – Martin Zabel Commented Feb 23, 2016 at 12:03
• Yes, sorry I just figured out how to retrieve the error messages from Greasemonkey in console, The error is "ReferenceError: GM_setClipboard is not defined". The expected behavior is that when I press Shift+* it will copy the text of the selected link. – DjH Commented Feb 23, 2016 at 12:05

1 Answer 1

Greasemonkey requires explicit @grant statements to use GM_ functions. Whereas Tampermonkey still does some auto detection (a potential security hole).

So:

1. You need to specify // @grant GM_setClipboard in your metadata block.

2. However, this switches the sandbox back on (a good thing), so you also need to make sure you've @required jQuery.

This script will work in both Greasemonkey and Tampermonkey:

// ==UserScript==
// @name     _YOUR_SCRIPT_NAME
// @match    http://YOUR_SERVER.COM/YOUR_PATH/*
// @require  http://ajax.googleapis./ajax/libs/jquery/2.1.0/jquery.min.js
// @grant    GM.setClipboard
// ==/UserScript==

document.addEventListener ( "keydown", function (i) {
    var selectLink = $('a').eq (8); // The link by index
    var targetLink = selectLink.text ().trim (); // The link text

    if (i.keyCode === 106  &&  i.shiftKey) // Shift+Num*
    {
        GM.setClipboard (targetLink); // Copy to clipboard
    }
} );