AJAX with JSON and PHP not returning any data... I think

Question

Why does my code not work?

I know I am sending data,

But there is no response.

jQuery

    $(document).ready(function(){
            $("form").submit(function () {

                var uname = document.getElementById("username").value;
                var pword = document.getElementById("password").value;
                var postData = {
                    username: uname,
                    password: pword
                };
                var PostDataString = JSON.stringify(postData);
                alert(PostDataString);

            $.ajax({
               url: "test.php",
               type: "GET",
               data: PostDataString,
               dataType: 'json',
               contentType: 'json',
               cache: false,
               success: function (ReturnData) {
                    alert("Yay!");
               } 
            });
    });
    });

PHP

$json = $_GET["PostDataString"];
$jsonarray = json_decode($json, true);
echo $jsonarray;

did you mean to GET or POST? Your options object looks a little confused. — Matt Whipple
– Matt Whipple, Commented Feb 7, 2013 at 3:06

Explosion Pills · Accepted Answer · 2013-02-07 03:04:13Z

4

json_decode is for turning a JSON string into PHP constructs. json_encode does the opposite and is what you want. You are expecting a json data type on the JavaScript side; jQuery will throw an error if it does not get valid JSON in that case.

The JSON.stringify conversion is unnecessary since $.ajax accepts a JavaScript object for its data attribute. In fact, stringifying the JSON prevents it from being sent as any parameter.

If you remove JSON.stringify and just send postData as-is. You can access $_GET['username'] and $_GET['password'], but no others.

answered Feb 7, 2013 at 3:04

Explosion Pills

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4 Comments

copilot0910 Over a year ago

But now a new problem arises. How do I return the GET data? What I mean is now that I can access the data in my php, how do I return it to the $.ajax function to work with the response?

Explosion Pills Over a year ago

@copilot0910 it depends .. wildly. What would be best for you to have in ReturnData? An object like {username: "username", password: "password"}? If so, use json_encode(array('username' => $_GET['username'], 'password' => $_GET['password']))

copilot0910 Over a year ago

I need to return the array, so yes.

copilot0910 Over a year ago

But still the problem arrises. When I try to alert anything after the data comes back from the PHP, I am getting nothing.

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