javascript - How to prevent JQuery script from repeating in a custom infinite scroll script -

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i'm using latest jquery. problem if user scrolls fast script fires twice in row. if user scrolls @ normal speeds or slowly, script works normally. have js @ bottom of page. added timeout when calling function, wait timeout , repeats script twice. repeating doesn't happen time. have setting call function @ -10px of scroll height. also, attempt i've made put loading gif doesn't seem work, delay on loading gif. there way prevent happening?

<body>     <div class="contentholderwrap"></div>      <div id="dataresult"></div>  </body>  <script type="text/javascript">     $(document).ready(function(){         function lastpostfunc(){             var endid = $(".contentholderwrap:last").attr("id");             if (endid != "1000000000000") {                 $.post("main.php?lastid="+$(".contentholderwrap:last").attr("id"), function(data) {                     if (data != ""){                         $(".contentholderwrap:last").after(data);                     }                     $('#dataresult').empty();                 });             }         };      $(window).scroll(function(){         if ($(window).scrolltop() >= $(document).height() - $(window).height() -10 ){             settimeout(lastpostfunc, 500);         }     }); }); </script>

your timeout didn't work because did delay function call, still queued 1 every time .scroll event happened. if want implement delay need use settimeout() prevent more 1 request within set period of time:

var timerid = null; $(window).scroll(function(){    if (timerid === null &&        $(window).scrolltop() >= $(document).height() - $(window).height() -10 ){          lastpostfunc();          timerid = settimeout(function() { timerid = null; }, 500);    } });

alternatively update lastpostfunc() function won't if previous ajax request still in progress:

 var ajaxinprogress = false;  function lastpostfunc(){      if (ajaxinprogress) return;       var endid = $(".contentholderwrap:last").attr("id");      if (endid != "1000000000000") {          $.post("main.php?lastid="+endid, function(data) {              if (data != ""){                 $(".contentholderwrap:last").after(data);              }              $('#dataresult').empty();              ajaxinprogress = false;          });          ajaxinprogress = true;      }  }

(a third option admit infinite scroll can annoying, use "load more" button/link instead.)


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