jQuery - Access PHP array values after AJAX POST

Question

I'd like to access a PHP array using JavaScript after a successful POST.

PHP Code:

return array('success' => true);

Javascript Code

$('#Get-Info').submit(function() {
$.post("info.php",
    function(data){
        if ( data['success'] ) {
            // Do things.
        }
    }
);
return false; });

The javascript function is definitely running, it just can't access the PHP array.

Are you setting a header so the content type is JSON? Also what does you response look like (is that the only thing being returned?) — Nick Craver
– Nick Craver, Commented Dec 9, 2010 at 0:40
I tried setting the content type to JSON, no luck. For the purpose of trying to figure out what's wrong, that is indeed the only thing being returned in the info.php file. — Dewgong
– Dewgong, Commented Dec 9, 2010 at 0:41

Håvard · Accepted Answer · 2010-12-09 00:41:20Z

3

Make the php return json. Not sure about this part as I'm not a php programmer, but the javascript would look like this:

$('#Get-Info').submit(function() {
$.post("info.php",
    function(data){
        if ( data['success'] ) {
            // Do things.
        }
    }, "json"
);
return false; });

The only difference being that jQuery will automatically parse the data as json, the datatype parameter. More info.

If I'm not horribly wrong, this should work for the php, although it requires PHP 5.2.0:

echo json_encode(array('success' => true));

More info.

answered Dec 9, 2010 at 0:41

Håvard

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2 Comments

Dewgong Over a year ago

Thanks. Works great. Do you know if there's much overhead associated with using json_encode in PHP?

Håvard Over a year ago

I can't imagine there being, but don't take my word on it. Like I said, I'm no php programmer.

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