Event when dom is loaded

From Microsoft IE. The DOMContentLoaded event fires when parsing of the current page is complete; the load event fires when all files have finished loading from all resources, including ads and images. From Mozilla Developer Network. A page can't be manipulated safely until the document is "ready.

See: Using JQuery Core's document-ready documentation. Many JavaScript frameworks wait for this event before they start executing their own logic. For this reason the browser captures the EventStart and EventEnd timestamps to allow us to track how long this execution took. If you don't have Javascript, then the order that your webpage is loaded may look like this:.

Or in the words of an inspection window, the DOMContentLoaded event will be fired much earlier then the load event blue line represents DOMContentLoaded , red line represents load event :. Since this is the most common situation, the creation of the DOMContentLoaded event actually has to wait in most scenarios for the style-sheets to be loaded as well. So the main difference between DOMContentLoaded and load is, in this situation, only the loading time of the image, which can be downloaded in parallel to your style-sheets and JS.

Here's some code that works for us. We found MSIE to be hit and miss with DomContentLoaded , there appears to be some delay when no additional resources are cached up to ms based on our console logging , and it triggers too fast when they are cached.

So we resorted to a fallback for MISE. You also want to trigger the doStuff function whether DomContentLoaded triggers before or after your external JS files. Test execution results: After the page is running for 5 seconds, console.

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Properties: constructor global ignoreCase lastIndex multiline source Methods: compile exec test toString. In JavaScript: object. In JavaScript, using the addEventListener method: object.

Report Error. Scripts have access to all of the elements on the page which are defined in the HTML file before the script tag. As this code is listening for when elements are rendered, the MutationObserver must be setup before the element you are looking for in the HTML.

For more things you can do with MutationObservers , take a look at our article on the topic. If you are waiting on a specific resource, you can bind to the load event of just that element. Note that if the image fails to load for some reason, the load event will never fire.