How to remove the Existing javascript function for the button

Question

<input name="mybutton" type="button" class="agh" id="id_button" value="Dim" onClick="resetDims();">

In the above Input tag i have to remove the entire "Onclick=myfunction();" and its function for the input tag and write my functionality for this button when we "click"

$("#mybutton").onclick(function(){
  //$("#mybutton").removeattr("onClick","");
})

Answer 1

If you need to remove the onclick attribute "on-demand" use

$('#id_button').removeAttr('onclick').click(function(){
});

Have a second look at the selector. You need to query the ID, your snippet trys to select mybutton as ID, which infact is the name of the element.

Answer 2

You cannot use unbind to remove an inline model onclick handler. unbind will only work with jQuery-bound event handlers. It can be done like this:

document.getElementById("id_button").onclick = null;

// you can still get the element using the jQuery shorthand though
// the point is to get at the DOM element's onclick property
$("#id_button")[0].onclick = null;

Demo: http://jsfiddle.net/ax52z/