jquery parse ajax response

Question

I'm using Jquery's ajax method, and I need help parsing data coming back from backend server.

server response will be either "valid" or "not valid.

Currently my "if statement logic is not working, this is what I have tried so far).

$.ajax({
    url: 'php/phone-valid.php',
    type: 'POST',
    data: {userid: $.trim($('#userid').val())},
    success: function(data) {
        console.log(data);

        if (result.indexOf("not valid")) {
            ("#mustbevalid").val("You must validate your phone number");
            console.log("Phone hasn't been validated");
            e.preventDefault();
        };
    }
});

Your help is highly appreciated.

if(data=="valid") would seem more logical than if(result.indexOf("not valid")) ... result is undefined. — Jeremy Thille
– Jeremy Thille, Commented Mar 17, 2015 at 17:17

MrCode · Accepted Answer · 2015-03-17 17:29:59Z

You're checking result.indexOf, but your response data is in data not result. Additionally, indexOf returns the position, which could be 0. So change to:

if(data.indexOf("not valid") > -1) {

Side note: this method of checking a result is error-prone and usually undesirable. It would be better for you to output a JSON object with a success property.

Example success response:

echo json_encode(array('success' => true));
// Outputs: {"success":true}

Example error response:

echo json_encode(array('success' => false));
// Outputs: {"success":false}

Now, you can parse the JSON:

$.ajax({
    ...
    dataType : 'json', // <-- tell jQuery we're expecting JSON
    success: function(data) {
        if (data.success) {
            // success
        } else {
            // error
        };
    }
});

Shawn Constance · Accepted Answer · 2015-03-17 17:20:07Z

0

indexOf will return the position in the string. So use this instead:

if(data.indexOf("not valid") == 0)

answered Mar 17, 2015 at 17:20

Shawn Constance

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