javascript - Ajax within a loop -


i have troubles using ajax within loop. loop , ajax work fine on own, combining them trouble starts.

below test script wrote see if script works before make rest. idea java script gets $numbers database , performs loop amount got (so in example 7 times).
each time ajax has send $numbers php search in database %color corresponding value of $numbers, since test took "check" instead. used target specific div corresponds value of $numbers en $color (in case $number , check).

@ moment i've tested while loop , ajax separately , work perfect, combining them goes wrong. while ajax script nothing freeze browser.
i've tried loop nothing except giving me uncaught typeerror: cannot set property 'innerhtml' of undefined.

this test script. 

<?php $number = 7; ?><?php if(isset($_post["number"])){     echo 'check';     exit(); } ?> <!doctype html> <html> <head> <meta charset="utf-8"> <title>test</title> <link rel="icon" href="favicon.ico" type="image/x-icon"> <script src="../scripts/main.js"></script> <script>     function testwhile() {         var number = <?php echo $number ?>;         while (number > 0) {             var x = document.getelementsbyclassname(number);             x[0].innerhtml = "check!";             var number = number - 1;         }     }     function testajax() {         var number = <?php echo $number ?>;         var colour = "check";         var ajax = ajaxobj("post", "test1.php");             ajax.onreadystatechange = function () {                 if (ajaxreturn(ajax) == true) {                     var colour = ajax.responsetext;                     var x = document.getelementsbyclassname(colour + ' ' + number);                     x[0].innerhtml = "check!";                 }                     }             ajax.send("number=" + number);      }     function testwhileajax(){         var number = <?php echo $number ?>;         while (number > 0) {             var colour = "check";             var ajax = ajaxobj("post", "test1.php");             ajax.onreadystatechange = function () {                 if (ajaxreturn(ajax) == true) {                     var colour = ajax.responsetext;                     var x = document.getelementsbyclassname(colour + ' ' + number);                     x[0].innerhtml = "check!";                     var numbers = numbers - 1;                 }                     }             ajax.send("number=" + number);          }     }     function testloopajax(){         (number = <?php echo $number ?>; number > 0; number--){             //var number = number;             var colour = "check";             var ajax = ajaxobj("post", "test1.php");             ajax.onreadystatechange = function () {                 if (ajaxreturn(ajax) == true) {                     var colour = ajax.responsetext;                     var x = document.getelementsbyclassname(colour + ' ' + number);                     x[0].innerhtml = "check!";                 }                     }             ajax.send("number=" + number);          }     } </script> </head> <body>     <div onclick="testajax()">check ajax!</div>     <div onclick="testwhile()">check while!</div>     <div onclick="testwhileajax()">check both!</div>     <div onclick="testloopajax()">check loop!</div>     <div class="1 check">check?</div>     <div class="2 check">check?</div>     <div class="3 check">check?</div>     <div class="4 check">check?</div>     <div class="5 check">check?</div>     <div class="6 check">check?</div>     <div class="7 check">check?</div> </body> </html>

any appreciated. :)


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