javascript - How do I implement a delay on jQuery keyup? -

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i'm making list filter , want delay in case user fast typer. looking @ different solutions similar questions hasn't helped me , don't understand logic implement.

this current code:

$.fn.filterlist = function(){        var inputfilter = $(this);     var list        = $('#' + inputfilter.data('list'));     var listitems    = list.children('li');      inputfilter.keyup(function(){          settimeout(function () {             var term = inputfilter.val().tolowercase();              listitems.each(function(i, e){                 var city = ($(e).text()).tolowercase();                  if(city.startswith(term)){                     console.log(city);                 }             });         }, 800);     });  };  $('.my-input').filterlist();

the problem trigger on each keyup, no matter how fast user types.

how can implement delay not trigger each keyup?

on each successive keypress need clear previous timer function fires x milliseconds after typing ends. try this:

var timer;  inputfilter.keyup(function() {     cleartimeout(timer);     timer = settimeout(function () {         var term = inputfilter.val().tolowercase();          listitems.each(function(i, e){             var city = $(e).text().tolowercase();             if (city.startswith(term)){                 console.log(city);             }         });     }, 800); });

basic example


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