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javascriptphpajaxpostresponse

How to POST ajax and get response?

I have a problem with a form, the post and the response. In my form I call a function (javascript) with the ajax post:

var vars = "test="+test;
$.ajax({
    type: "POST",
    url: "index.php",
    data: vars
}).done(function(data) {
    alert(data);
}).fail(function(data) {
    alert(data);
});

In index.php I receive all the data:

<?php
    $test = $_POST['test'];
    //do something
?>

After I have to give back a value to the previous php. How can I do?? Thanks

Solution 
  • var vars = "test="+test;
$.ajax({
    type: "POST",
    url: "index.php",
    data: vars
    success: function(html){
         alert(html)
    }
});

    in index.php, enter follow code and check

    <?php
    $test = $_POST['test'];
    //do something
    echo $test
?>