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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. |
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| <pre class="sample">if(typeof __PAGE_SCOPE_RUN__ == 'undefined') {
| | 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() {
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| var script = document.createElement('script');
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| script.setAttribute("type", "application/javascript");
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| script.textContent = "(function() { var __PAGE_SCOPE_RUN__ = 'yes'; (" + page_scope_runner.caller.toString() + ")(); })();";
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| document.documentElement.appendChild(script);
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| document.documentElement.removeChild(script);
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| })();
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| return;
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| }</pre>
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| 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.
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| == Tips ==
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| * 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.
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| * Any code before the block will be run twice: Once in GreaseMonkey context, once in page context.
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| * Any code after the block will only be run once, in the page context.
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| == Explanation ==
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| 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 userscript. Finally, the block calls <code>return</code>, ending execution.
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| <!-- This still needs work.
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| == @require ==
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| If used as the first [[Metadata Block#.40require|@require]]d script, this snippet will continue to run and work perfectly.
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| Try it by adding this line as the first @require in the [[Metadata Block]]:
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| <nowiki>// @require http://userscripts.org/scripts/source/68059.user.js</nowiki>
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| -->
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| [[Category:Coding Tips:Interacting With The Page]]
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| [[Category:@require Library]]
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