jquery - How to make the select box value back to the default value -

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here want make select box value default value. 

 $(".reportingto").change(function() {         var reportingtovalue = $(this).val();         var reportingtoid=$(this).attr('id');         $('select[id^="reportingto"]').each(function() {             if(reportingtoid!==$(this).attr('id')&& reportingtovalue===$(this).val()){                 alert("duplicate found");                 $(reportingtoid).val( $(reportingtoid).prop('defaultselected') );             }          });

if default value first/top one, solution work you.

// replace $(reportingtoid).val( $(reportingtoid).prop('defaultselected') );  // $('#'+reportingtoid).prop('selectedindex',0);

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