php - JQUERY when user types too quickly -


i working on search system , here html code

<input type="text" class="searchchats" placeholder="search">         <div class="resc">  </div>

and jquery/ajax code

$(".searchchats").keyup(function(e) {     var val=$(this).val();   if (e.which >= 47 && e.which <= 90 || e.which==8){     if (val!="") {         $(".resc").empty();         $(".resc").show();         $.ajax({             url: '../files/connect.php',             type: 'get',             cache: false,             contenttype: false,             processdata: false,             data:"scts="+val,             success: function(ret)             {                 $(".resc").append(ret);             }         });         $(".overviewrap").hide();     }else{         $(".resc").hide();         $(".overviewrap").show();     } } });

and connect.php

if (isset($_get['scts'])) {     $value=$_get['scts'];     $value=strtolower($_get['scts']);     $querya=$con->query("select * followers follower='$nameid'");     $followings=[];     $count=0;     while ($folrow=$querya->fetch_row()) {         $query=$con->query("select username users id='$folrow[2]'");         $namerow=$query->fetch_row();         $namechat=$namerow[0];         if (strpos($namechat, $value) !== false) {         $profilepicquery=$con->query("select profile_pic user_opt username='$folrow[2]'");         $profilepicrow=$profilepicquery->fetch_row();            ?>             <div class="overview">                     <img src='../users/<?php echo $profilepicrow[0] ?>' class="overviewimg" />                     <span class="overviewspan"><?php echo $namechat;?></span>             </div>             <?php             $count++;         }     }

the problem when user types m gives users start m when user types murad gives user name murad duplicates 5 times(because has got 5 charachters)

firstly, should add timeout decrease number of ajax requests. secondly, can abort ajax request while user still typing, , thirdly should start search after number of characters have been pressed.

try following:

var searchchatstimeout = false; var ajaxquery = false; $(".searchchats").keyup(function(e) {    cleartimeout(searchchatstimeout);   if (ajaxquery !== false) {     ajaxquery.abort();   }   var val = $(this).val();    if (val === '') {        $(".resc").hide();       $(".overviewrap").show();        return;   }    searchchatstimeout = settimeout(function(){              ajaxquery = $.ajax({                 url: '../files/connect.php',                 type: 'get',                 cache: false,                 contenttype: false,                 processdata: false,                 data:"scts="+val,                 success: function(ret)                 {                      // empty , show .resc if query successful                      $(".resc").empty();                      $(".resc").show();                       $(".resc").append(ret);                       // hide overviewrap if query successful                      $(".overviewrap").hide();                 }             });     }, 400);  });

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