When working with JavaScript, how do you go about restoring the default behavior of a DOM element's event handler?
For instance, let's say you've set the onkeypress event for an input element:
elem.onkeypress = function() { alert("Key pressed!"); }
But later on, you want to remove this event. Is it acceptable to simply set the onkeypress property to null? I've tried this method and it seems to work, but I'm not sure if it's the recommended approach.
Most likely, the values for the events will be set to undefined instead of null, so it would be wise to revert back to that.
While it may seem like an excessive measure, for added resilience, it's advisable to retain a reference to whatever was previously registered to the onkeypress event and then reassign it (just in case another script is attempting to use it as well). Like so:
var oldKeyPress = elem.onkeypress;
elem.onkeypress = function() { alert("Key pressed!"); }
//... later ...
elem.onkeypress = oldKeyPress;
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