javascript - PHP Infinite scroll pulling random results? -

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i have page returns 16 records table.

as user scrolls bottom, pull 12 records table , append them previous results, problem results being duplicated, , not in correct order.

js

    // ajax getentries.php     var url = location.pathname;     if(url.indexof('missing-people.php') > -1) {         didscroll = false;         $(window).scroll(function () {             didscroll = true;         });         setinterval(function () {             if(didscroll) {                 didscroll = false;                 if(($(document).height() - $(window).height()) - $(window).scrolltop() < 100) {                     var number = $(".directory").children().length;                     $.ajax({                         type: "post",                         url: "getentries.php",                         data: "count=" + number,                         success: function (results) {                             $('.directory').append(results).fadein();                         }                     });                 }             }         }, 250);     }

php

    $result = mysql_query("select * directory limit {$_post['count']},12");      $c = 1;     while($row = mysql_fetch_array($result))       {      echo '<div class="entry';                      if (($c % 4) == 1) echo ' alpha ';                 echo ' span3"><span class="name">' . $row['first_name'] . ' ' . $row['surname'] . "</span>";                 echo '<a href="/missing-people/' . strtolower($row["location_county_last_seen"]) . '/' . strtolower($row["first_name"]) . '-' . strtolower($row["surname"]) . '/' . $row["id"] . '"><img src="/access/upload/' . $row["picture_1"] . '" alt="' . $row['first_name'] . ' ' . $row['surname'] . ', missing since ' . $row['date_last_seen'] . ' " /></a>';                 echo '<span class="missing-from">last seen in ' . ucwords($row["location_county_last_seen"]) . '</span><a href="/missing-people/' . strtolower($row["location_county_last_seen"]) . '/' . strtolower($row["first_name"]) . '-' . strtolower($row["surname"]) . '/' . $row["id"] . '">view profile</a></div>';                        $c++;        }      mysql_close($con);

it seems it's race condition. indeed, if scroll page happens:

  1. the setinterval gets triggered
  2. there 12 images in dom, hence var number = $(".directory").children().length 12.
  3. now new data fetched server ajax.

now, if i'm still @ bottom of page , ajax calls hasn't completed yet, setinterval going triggered again, number still resolve 12 , i'm going same ajax request. hence duplication.

solving issue simple setting number @ beginning of script , incrementing every time make ajax call.

    // ajax getentries.php var url = location.pathname; var number = $(".directory").children().length; if(url.indexof('missing-people.php') > -1) {     didscroll = false;     $(window).scroll(function () {         didscroll = true;     });     setinterval(function () {         if(didscroll) {             didscroll = false;             if(($(document).height() - $(window).height()) - $(window).scrolltop() < 100) {                 number += 12;                 $.ajax({                     type: "post",                     url: "getentries.php",                     data: "count=" + number,                     success: function (results) {                         $('.directory').append(results).fadein();                     }                 });             }         }     }, 250); }

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