How to find checked event in a checkbox using jquery? -

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i trying execute function on clicking check box. using following code not working can find whats problem code?

$('#selectall').click(function(){      alert("hi"); });

html

<th><input type="checkbox" name="selectl" value="on" id="selectall"/></th> 

$(function(){     $('#selectall').change(function(){          alert("value changed");     }); });

see working demo.


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