Why is AJAX in jQuery not receiving the JSON string from PHP?

Question

Thanks for taking a look at my question, firstly, I know this is not the first time a question of this nature has been asked, but I have being reading StackOverflow for over 3 hours now... still can't figure it out.

Here's the gist:

I'm trying to send a value from messaging.php to messaging.js using json_encode.

-> Here's the messaging.php code:

<?php
header('Content-Type: application/json');
global $wpdb;
$current_user = wp_get_current_user();

$to = $_POST['uname'];
$subject = $_POST['subject'];
$message = $_POST['msg'];


$table_name = $wpdb->prefix . 'none_of_ur_business';

if(isset($to) && isset($to) && isset($to)):
$wpdb->insert(
    $table_name,
    array(
        'notit_sender_userid' => $current_user->display_name,
        'notit_receiver_userid' => $to,
        'notit_subject' => $subject,
        'notit_message' => $messagem
    )
);

$testtext = 'does this work??';
echo json_encode(array('test' => $testtext));


endif;

Here's the messaging.js code:

function sendMessage(uname, subject, message){
  $.ajax({
    url : wp_directory+'/modules/messaging/messaging.php',
    dataType : 'JSON',
    type : 'post',
    data: {
         'uname' : uname,
         'subject' : subject,
         'msg' : message
     },
     success: function(data) {
         alert(data.test);
     }

  });

A couple of relevant things:

I am developing on the WordPress platform
I use messaging.php to send data to my database (Maybe that's why, it's not working??)

I don't get anything from the ajax success function, it never "alerts"

Please provide any help you can, I would highly appreciate it!

How is the sendMessage function being called? Did you look for a response in the browser developer tools? — Mottie
– Mottie, Commented Jan 7, 2017 at 4:06
did you check with using error call back ? if the call is failing — Deep
– Deep, Commented Jan 7, 2017 at 4:07
i suggest you to add an error callback after success to check if the request is failing at some point. — Farooq Ahmed Khan
– Farooq Ahmed Khan, Commented Jan 7, 2017 at 4:08
Try setting the content type of the header of the response to json ` header('Content-type: application/json');` — Nadir Laskar
– Nadir Laskar, Commented Jan 7, 2017 at 4:11
check browser developer tools network tab to see what is actually happening regarding request and response — Jaromanda X
– Jaromanda X, Commented Jan 7, 2017 at 4:12

Dharman · Accepted Answer · 2024-01-26 16:03:11Z

3

in wordpress you are trying to access file (messaging.php) separatly( out of wordpress) and in messaing.php you have used " global $wpdb; " which is wrong.

First you should include necessary wordpress files. Add below code to your messaging.php

define( 'SHORTINIT', true );
require '{wp_root}/wp-load.php';

change {wp_root}. if your wordpress installed on server root then it will be like $_SERVER["DOCUMET_ROOT"] or you have to adjust manually.

for more info check this page: Using WPDB in standalone script?

edited Jan 26, 2024 at 16:03

Dharman♦

33.9k27 gold badges106 silver badges157 bronze badges

answered Jan 7, 2017 at 4:16

Pawan Developers

3874 silver badges17 bronze badges

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