Ajax, handling the php response in javascript

Question

So I'm learning Ajax and I followed this tutorial: https://phpacademy.org/course/submitting-a-form-with-ajax to create a function that works for any form. This is the complete function:

$('form.ajax').on('submit', function() {
    var that = $(this),
        url = that.attr('action'),
        type = that.attr('method'),
        data = {};

    that.find('[name]').each(function(index, value) {
        var that = $(this),
            name = that.attr('name'),
            value = that.val();

        data[name] = value;
    });

    $.ajax({
        url: url,
        type: type,
        data: data,
        success: function(response) {
            alert(url + ' ' + response);
        }
    })
    return false;
});

As you see all I'm doing is alerting the response, which in this case is php echo. That's where my problem starts, I need a flexible and secure way to handle the javascript/php communication. Preferrably one function for all forms, maybe with if () statements instead of alert(url + ' ' + response); depending on the form url.

The function I need is not very complicated, based on the response I get I will just update the current form with errors.

Aslong as I know what to use in the communication I'm fine from there, echo '1'; as I have now doesn't feel like the ideal solution but it's all I could handle.

So, what type of response should I send from the php page, and where (in the javascript) and how is the best way to handle it? I've heard of json but having a hard time wrapping my head around it. Could someone show a json response sending a basic integer thats easy for my response to pick up as an int?

Simple JSON response { response : 1 } - Accessed as response.response (I typically use data as my param name in the success callback, but that's all preference) — tymeJV
– tymeJV, Commented Sep 23, 2013 at 15:32
I tried getting it to work but I only get undefined back. In the php I did if () { response : 1} tried with semi-colon and everything I could think of, and in the js I do success: function(response) { alert(url + ' ' + response.response); } — justanotherhobbyist
– justanotherhobbyist, Commented Sep 23, 2013 at 15:43
You'll have to json_encode your data on the PHP side. (Assuming your type is json. — tymeJV
– tymeJV, Commented Sep 23, 2013 at 15:44
Guess I have to watch a simple json tutorial, change your comment to an answer and I'll give you credit. — justanotherhobbyist
– justanotherhobbyist, Commented Sep 23, 2013 at 15:50

tymeJV · Accepted Answer · 2013-09-23 15:53:40Z

2

You can send back a simple JSON response via PHP and check it in your success callback. Make sure you're setting the type to json and in your AJAX call, and using json_encode on the PHP side:

$response = array('response' => 1);
echo json_encode($response);

Output should be:

{ 'response' : 1 }

answered Sep 23, 2013 at 15:53

tymeJV

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1 Comment

Izkata Over a year ago

Don't forget, header('Content-type: application/json');

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