Content Scope Runner: Difference between revisions

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An extension of the [[Content Script Injection]] technique, this snippet automatically runs the ''entire'' user script in the content scope.
As of Greasemonkey 1.0 specifying <code>[[@grant]] none</code> provides the behavior previously available by this technique.


<pre class='sample'>
The previous content of this page is available [http://wiki.greasespot.net/index.php?title=Content_Scope_Runner&oldid=7215 via history] only.
(function page_scope_runner() {
  if ('undefined' == typeof __PAGE_SCOPE_RUN__) {
    // If we're _not_ already running in the page, grab the full source
    // of this script.
    var my_src = page_scope_runner.caller.toString();
 
    // Create a script node holding this script, plus a marker that lets us
    // know we are running in the page scope (not the Greasemonkey sandbox).
    var script = document.createElement('script');
    script.setAttribute("type", "application/javascript");
    script.textContent = "const __PAGE_SCOPE_RUN__ = true;\n" + my_src;
 
    // Insert the script node into the page, so it will run, and immediately
    // remove it to clean up.
    document.documentElement.appendChild(script);
    document.documentElement.removeChild(script);
 
    // Stop running, because we know Greasemonkey actually runs us in
    // an anonymous wrapper.
    return;
  }
})();
</pre>
 
As long as this is the ''first'' piece of code in your script, it will stop execution of the remainder of the script, and re-start execution completely within the content scope.
Thus you need not worry about any of the [[security]] restrictions from [[XPCNativeWrappers]] in the Greasemonkey [[sandbox]].
You also will, of course, not have access to any of the [[API]]s.
 
== @require ==
 
If used as the first [[Metadata Block#.40require|@require]]d script, this snippet will continue to run and work perfectly.
Try it by adding this line as the first @require in the [[Metadata Block]]:
 
<nowiki>// @require http://userscripts.org/scripts/source/68059.user.js</nowiki>
 
[[Category:Coding Tips:Interacting With The Page]]
[[Category:@require Library]]

Latest revision as of 15:12, 23 September 2015

As of Greasemonkey 1.0 specifying @grant none provides the behavior previously available by this technique.

The previous content of this page is available via history only.