The jQuery prop() method is used to know the status of checkboxes which specifies its checked or unchecked status.
Do not confuse with "checked" attribute. The "checked" attribute only define the initial state of the checkbox, and not the current state.
<script type="text/javascript">
$(document).ready(function(){
$('input[type="checkbox"]').click(function(){
if($(this).prop("checked") == true){
alert("Checkbox is checked.");
}
else if($(this).prop("checked") == false){
alert("Checkbox is unchecked.");
}
});
});
</script>
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