javascript - How to change the value of check box when it is checked or unchecked -


hello guys here problem. want perform different calculation based on check box. 

<div>  cod: <input type="checkbox" id="trigger" name="question" > </div>

here javascript calculating price of item problem dont know how can else if method

<script>     $("#price,#quant,#shipment").keyup(function () {       if(+myfunction3() =="" )       {         $('#demo').val(0);       }       else if($('#trigger')=="checked") //this problem       {         $('#demo').val($('#price').val() * $('#quant').val() ;       }       else       {       $('#demo').val($('#price').val() * $('#quant').val() + +myfunction3());      }   });   </script>

advance thank guys.

using jquery do:

else if($('#trigger:checked').length > 0)

or

else if($('#trigger').is(':checked'))

if want re-run calculation when user checks or un-checks checkbox, run same code run on keyup function on:

$('#trigger').change(function() {   ... })

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