javascript - ajax test not working -


i tried simple ajax-test working without success. trying pass variable($add1) php js, let js calculate sum , return php variable via $_post , echo out in html.

index.php:

<?php   echo "<script type='text/javascript' src='script.js'></script>"; $add1 = 3; echo "<script>sum($add1)</script>"; $sum = $_post['variable'];  echo $sum;  ?>

script.js:

function sum(param) {     var sum = 3;     sum = 3 + param;      $.ajax({         type: 'post',         url: 'index.php',         data: {             'variable': sum         },     }); }

for reason code doesn't work. appreciated.

i want php file pass $add1 javascript , want javascript return var sum php , php echo $sum $post.

$sum $_post echoed, not shown in html page, handled response ajax.

you have add success function in ajax closure 

$.ajax({         type: 'post',         url: 'index.php',         data: {             'variable': sum         },         success: function (data){             document.write(data);         }     });

you see answer show in page.

php:

if (isset($_post['variable'])) {     $sum = some_futher_function($_post['variable']);     echo $sum; } else {     echo "<script type='text/javascript' src='script.js'></script>";     $add1 = 3;     echo "<script>sum({$add1})</script>";  } function some_futher_function($param){     //do thing      return $return; }

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