Why clicking on checkbox does not add the attribute checked='checked'

javascript jquery html jquery-selectors jquery-events
felix picture felix · Feb 3, 2011 · Viewed 27.1k times · Source

When I click a checkbox, why does checked attribute is not getting added?. You can see the code here http://jsfiddle.net/FCrSg/

Answer

David Tang picture David Tang · Feb 3, 2011

The HTML attribute checked means: checked by default, when the page loads. This won't change when the checkbox is clicked.

<input type="checkbox" checked="checked"> <!-- The HTML attribute -->

The DOM property checked is actually the current state of the checkbox and is either true/false. This will change when the checkbox is clicked, but isn't visible when you inspect the HTML.

$('input:check')[0].checked == true;
// Whether or not the checkbox is currently checked

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