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jQuery data cache question

Posted on 2008-10-23
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Last Modified: 2012-05-05
I noticed in the jQuery documentation, there's a "data cache" with the function calls data(name) and data(name, value). Does anybody know if this data cache persists across loading multiple different pages? And if it doesn't, what is it good for?

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Question by:tjgquicken
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sh0e earned 50 total points
ID: 22792811
They do not persist, they are attached to the DOM object.
They are "custom properties" that you attach to the DOM node.
So, if you remove the DOM element the data store goes with it.

It can be useful if you want to store data that you want to associate with an element, and can help with scoping for example (to keep things in the scope of the element).

Below script checks if I pressed the same key as last time.  Notice how using data allows me to stay within the scope of the element.  There are other uses too of course, and it's used in plugins a lot.
<div id="mydiv"></div>
<script>
$('mydiv').keyup(function(event){
  if( $(this).data('lastclick') == event.keyCode )
    alert('same as last time');
  $(this).data('lastclick', event.keyCode);
});
</script>
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