|
|
| (8 intermediate revisions by 4 users not shown) |
| Line 1: |
Line 1: |
| 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">if ('undefined' == typeof __PAGE_SCOPE_RUN__) {
| | 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 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).
| |
| // Note that we are intentionally *not* scope-wrapping here.
| |
| var script = document.createElement('script');
| |
| script.setAttribute("type", "application/javascript");
| |
| script.setAttribute("src",
| |
| "data:,"+escape("var __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. Use setTimeout to force execution "outside" of
| |
| // the user script scope completely.
| |
| setTimeout(function() {
| |
| document.body.appendChild(script);
| |
| document.body.removeChild(script);
| |
| }, 0);
| |
| })();
| |
| | |
| // Stop running, because we know Greasemonkey actually runs us in
| |
| // an anonymous wrapper.
| |
| return;
| |
| }</pre>
| |
| | |
| As soon as execution reaches this code, the entire script will be injected into the page and re-run. 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.
| |
| | |
| == Tips == | |
| | |
| * This code must not be wrapped in a function, or the <code>return</code> will fail to work. It may be wrapped in a conditional.
| |
| * Any code before (and including) this block will be run twice: Once in GreaseMonkey context, once in page context.
| |
| * Any code after this block will only be run once, in the page context.
| |
| | |
| == Explanation ==
| |
| | |
| The code block first checks to see if it is being run inside the page by looking for a marker it knows about.
| |
| If the marker is not present, the block creates and injects a script element that starts by setting the aforementioned marker variable and finishes by executing the text of the user script.
| |
| Finally, the block calls <code>return</code>, ending execution.
| |
| | |
| == @require ==
| |
| | |
| Since it must run before the rest of the script, this snipped functions best as the first [[Metadata Block#.40require|@require]].
| |
| 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]]
| |
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.
