Is there an onload event for input elements?

Question

Is it possible to trigger a Javascript script, when an input element or any other html element is rendered. This script should be triggered from within the html tag, so that we should be able to pass 'this' to the js function.

Answer 1

No, there is no such event.

However, a <script> tag placed directly after the HTML element would have a similar effect: It would be executed directly after the element has been rendered:

<input type="text" id="input123" value="Hello World!">  <script> alert("Input123 is now ready:"+document.getElementById("input123").value); </script> 

In most cases, however, it is best to use the document-wide load (or DOMReady, or jQuery's .ready()) to start any script operations. The DOM will be fully ready then.

Answer 2

A way to simulate such an event is to create a custom data-* atttribute (HTML-5 valid) and use that as a selector. Then in the main javascript code, you can add a selector for anything which has this specific data-XXX attribute and evaluate the javascript code inside.

Example HTML code:

<div data-onload="sampleFunction('param1', 2)"></div> 

Example Javascript code (using jQuery). It is also possible to use normal DOM to find elements with this attribute.

/* Find any element which has a 'data-onload' function and load that to simulate an onload. */ $('[data-onload]').each(function(){     eval($(this).data('onload')); }); 

This works well. I actually use it in production.