:checked attribute returning the first value, even after changes

[<[email protected]…>]

<input type="checkbox" checked="checked" id="sure"/>
<input type="checkbox" id="unsure"/>
<script>
 $('#sure,#unsure').change(function(){
            console.log($('#sure').attr('checked'),$('#unsure').attr('checked'));
 })

//1.6b1
$("#unsure").trigger('change') // checked undefined
$("#unsure").trigger('change') // checked undefined

//1.5.2
$("#unsure").trigger('change') // true true
$("#unsure").trigger('change') // true false
</script>

[Rick Waldron]

Thanks for taking the time to contribute to the jQuery project! Please provide a reduced jsFiddle test case to help us assess your ticket!

Additionally, be sure to test against the jQuery Edge version to ensure the issue still exists.

[Timmy Willison]

That is the correct behavior. This is something that was fixed in attr in 1.6 (removing the ambiguity). .attr('checked') retrieves the actual attribute (which correctly returns undefined as it does not exist on unsure) rather than the property. For DOM properties, use the .prop method. However, the preferred way to check if a box is checked, is with .is(':checked').