Prototype when document ready




















Email Required, but never shown. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Related Hot Network Questions. That's because even listeners are internal things. It's not that, when an image is loaded, the browser calls the onload method. Instead, when you set the onload method, that function is internally stored as an event listener, and when the image is loaded the browser runs the load event listeners.

This provides a notification for any image loading, at least in Opera Presto and Firefox haven't tried any other browser. The script tag is placed in the HEAD element so it is executed and the event listener installed before any of the body content is loaded. Of course, by changing the filtering on tagName it will also serve to respond to the loading of any other element that fires a load event, such as a script tag.

If the page is already loaded and you execute the jQuery snippet again, it will execute. It detects that the dom is already loaded and does the reasonable thing: executes the contained callback right away. If that code is put on the page for execution after the dom is loaded, the callback will never get called.

This issue was fixed in jQuery 3. Asked ago. Active 3 hr before. Viewed times.



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