javascript - clearTimeout & setTimeout not working -

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as follow of question, i'd know why not working

$("#textarea").keydown(function(){ oldvalue = $("#textarea").val(); }); $("#textarea").keyup(function(){ var starttimer = null; if(starttimer) cleartimeout(starttimer); starttimer = settimeout(function(){ var newvalue = $("#textarea").val(); // out of comparison alert(something) // alert comparison   oldvalue = newvalue;  },2000);

the required behavior alert message when user hasn't typed 2 seconds. works comparison part, however, doesn't stop alert message when keep typing should. instead, same number of alerts number of keys pressed. tried version of creating , deleting cookies, worked fine. wrong in particular case?

you're getting new starttimer (and initializing null) on each call keyup handler. try declaring in outside scope:

(function() {     var starttimer = null;     var oldvalue; // declare too, isn't global      $("#textarea").keydown(function(){         oldvalue = $("#textarea").val();     });     $("#textarea").keyup(function(){         if(starttimer) {             cleartimeout(starttimer);         }         starttimer = settimeout(function(){             var newvalue = $("#textarea").val();             // out of comparison             alert(something) // alert comparison             oldvalue = newvalue;         },2000);     }); })();

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