jQuery ON error. No error when using LIVE -

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this question has answer here:

this current, want change .live .on not working.. 

$('#searchstring').live('keydown',function(e) { if (e.which == 13) {     if (!$("#searchstring").val()) {         alert("inget postnummer eller ort angiven!");         return false;     } } });      $('#searchstring').on('keydown',function(e) { if (e.which == 13) {     if (!$("#searchstring").val()) {         alert("inget postnummer eller ort angiven!");         return false;     } } });

this on version

in event delegation model of on() target element selector passed second argument on() method.

$(document).on('keydown', '#searchstring', function(e){     if (e.which == 13) {         if (!$("#searchstring").val()) {             alert("inget postnummer eller ort angiven!");             return false;         }     } })

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