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    <p><strong>Note: This method <a href="https://code.google.com/p/chromium/issues/detail?id=333318" rel="nofollow">no longer works as of Chrome 36</a>. There are no direct alternatives.</strong></p> <p><sup>Note: The answer below only applies to external scripts, i.e. those loaded with <code>&lt;script src&gt;</code>.</sup></p> <p>In Chrome (and Safari), the "beforeload" event is triggered right before a resource is loaded. This event allows one to block the resource, so that the script is never fetched. In this event, you can determine whether the loaded resource is a script, and check whether you want to perform some action</p> <p>This event can be used to emulate <a href="https://developer.mozilla.org/en-US/docs/Mozilla_event_reference/beforescriptexecute" rel="nofollow">beforescriptexecute</a> / <a href="https://developer.mozilla.org/en-US/docs/Web/Reference/Events/afterscriptexecute" rel="nofollow">afterscriptexecute</a>:</p> <pre class="lang-js prettyprint-override"><code>document.addEventListener('beforeload', function(event) { var target = event.target; if (target.nodeName.toUpperCase() !== 'SCRIPT') return; var dispatchEvent = function(name, bubbles, cancelable) { var evt = new CustomEvent(name, { bubbles: bubbles, cancelable: cancelable }); target.dispatchEvent(evt); if (evt.defaultPrevented) { event.preventDefault(); } }; var onload = function() { cleanup(); dispatchEvent('afterscriptexecute', true, false); }; var cleanup = function() { target.removeEventListener('load', onload, true); target.removeEventListener('error', cleanup, true); } target.addEventListener('error', cleanup, true); target.addEventListener('load', onload, true); dispatchEvent('beforescriptexecute', true, true); }, true); </code></pre> <p>The dispatch times are not 100% identical to the original ones, but it is sufficient for most cases. This is the time line for the (non-emulated) events:</p> <pre class="lang-js prettyprint-override"><code>beforeload Before the network request is started beforescriptexecute Before a script executes afterscriptexecute After a script executes onload After the script has executed </code></pre> <p>Here's an easy way to see that the events are working as expected:</p> <pre class="lang-js prettyprint-override"><code>window.addEventListener('afterscriptexecute', function() { alert(window.x); }); document.head.appendChild(document.createElement('script')).src = 'data:,x=1'; document.head.appendChild(document.createElement('script')).src = 'data:,x=2'; </code></pre> <p>The demo can be seen live at <a href="http://jsfiddle.net/sDaZt/" rel="nofollow">http://jsfiddle.net/sDaZt/</a></p>
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    1. POHow do you detect that a script was loaded *and* executed in a chrome extension?
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    1. COI didn't know beforeload was a bubbling event (load is not, which is an incredible pain). I think this will work! Ingenious, thanks!
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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