AJAX Call to PHP file: return value is empty

Question

I have a simple ajax call:

function init() {
    $.ajax({
        url: "./myFolder/user.php",
        data: {
            action: "init"
        },
        type: "post",
        success: function (output) {
            console.log("Success");
            console.log("Output: " + output);
        }
    });
}

The PHP init method gets called and simply should return some json data:

function init() {
    $arr = array(
        array(
            "region" => "valore",
            "price" => "valore2"
        ),
        array(
            "region" => "valore",
            "price" => "valore2"
        ),
        array(
            "region" => "valore",
            "price" => "valore2"
        )
    );

    return json_encode($arr);
}

but my console says:

Success
Output:

So the output variable is empty. Where is my json data?

Do you actually output the data given by `init()` somewhere, or do you just return it? — Joel Hinz, Jul 18 '15 at 15:55
Are you sure the `init()` function is getting called? I mean, you know that writing `action: "init"` in the javascript doesn't call the php function, right? Echoing the encoded array should be enough. — Joel Hinz, Jul 18 '15 at 15:58
the solution of @Maxxi is correct. echo instead of return. but why? — Mulgard, Jul 18 '15 at 16:05

Alive to die - Anant · Accepted Answer · 2015-07-18T16:05:57.920

1

On user.php page you need to do :-

function init() {
        $arr = array(
            array(
                "region" => "valore",
                "price" => "valore2"
            ),
            array(
                "region" => "valore",
                "price" => "valore2"
            ),
            array(
                "region" => "valore",
                "price" => "valore2"
            )
        );

        echo  json_encode($arr);
    }

edited Jul 18 '15 at 16:05

answered Jul 18 '15 at 16:01

Alive to die - Anant

70,531
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why should i need that? i call my init method asynchronosly using javascript. so why should i call it in my php file? that makes no sense. – Mulgard Jul 18 '15 at 16:03
yes. now it is working. can you explain why echo is working and return isnt? – Mulgard Jul 18 '15 at 16:06
proper definition is given in this link:- http://stackoverflow.com/questions/10107144/difference-between-php-echo-and-return-in-terms-of-a-jquery-ajax-call – Alive to die - Anant Jul 18 '15 at 16:11

score -2 · Answer 2 · answered Jul 18 '15 at 15:58

-2

u should have in your user.php somthing like this:

die(init());

answered Jul 18 '15 at 15:58

M0rtiis

3,676
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sorry... but... what? – Mulgard Jul 18 '15 at 16:00
What exactly don't you understand? your php script should not just generate data but OUTPUT it. with echo, die, etc – M0rtiis Jul 18 '15 at 16:05

AJAX Call to PHP file: return value is empty

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