In my WordPress v5.8.2, I have localized the ajax_url in the functions.php:

wp_localize_script('site_admin_ajax', 'site_ajax', array('ajax_url' => admin_url('admin-ajax.php'), 'check_nonce' => wp_create_nonce('site_ajax_nonce')));

With the below jQuery script I am processing the form to check if the email ID from the HTML form is already existed in the WordPress:

   $(document).on("submit", "#form", function(e) {
     e.preventDefault();
     $email = $(this).find('input[name=email]').val(); // email
     //ajax request, check if user exists
     $.ajax({
       type: "GET",
       dataType: 'json',
       url: site_ajax.ajax_url,
       data: {
         action: 'email_exists_check',
         security: site_ajax.site_ajax_nonce
       },
       success: function(data) {
         if (data.result) {
           alert('Email exists!');
         } else {
           alert('Email doesn't exsists!');
         }
       }
     });
   });

Below the PHP code in separate file to check email:

add_action('wp_ajax_email_exists_check', 'email_exists_check');
add_action('wp_ajax_nopriv_email_exists_check', 'email_exists_check');

function email_exists_check() {

  $email = $_GET['email'];

  // do check
  if (email_exists($email)) {
    $response - > result = true;
  } else {
    $response - > result = false;
  }

  // echo json
  echo json_encode($response);
}

The above entire code is not able to alert if email exists.

I have tested the code form_email_exists_check() without ajax and is working fine. How can I make this code work?

Update #1

This is how the js file is enqueued, which contains the above jQuery script along with other scripts:

wp_enqueue_script('site-scripts', get_stylesheet_directory_uri() . '/assets/js/site-scripts.js', array('jquery'), null, true);

Tried enqueuing as below inline with wp_localize_script() document:

wp_enqueue_script('site_admin_ajax', get_stylesheet_directory_uri() . '/assets/js/site-scripts.js', array('jquery'), null, true);

Still this did not worked. I am getting this error in the console Uncaught ReferenceError: site_ajax is not defined, means the admin-ajax.php is not loading and result is 0.

CodePudding user response：

Try parsing JSON response like this :

 $(document).on("submit", "#form", function(e) {
     e.preventDefault();
     $email = $(this).find('input[name=email]').val(); // email
     //ajax request, check if user exists
     $.ajax({
        type: "GET",
        dataType: 'json',
        url: site_ajax.ajax_url,
        data: {
            action: 'email_exists_check',
            security: site_ajax.site_ajax_nonce
        },
        success: function(data) {
            var status = JSON.parse(data);
            if (status.result === true) {
                alert('Email exists!');
            } else {
                alert('Email doesn\t exsists!');
            }
        }
    });
});

Also , do not forget die() after AJAX call in WordPress

<?php 
add_action('wp_ajax_email_exists_check', 'email_exists_check');
add_action('wp_ajax_nopriv_email_exists_check', 'email_exists_check');

function email_exists_check() {

    $response = array();
    $email = $_GET['email'];

    // do check
    if ( email_exists( $email ) ) {
        $response['result'] = true;
    } else {
        $response['result'] = false;
    }

    // echo json
    echo json_encode( $response );
    die();
}

CodePudding user response：

Your Enqueue Script is ok, but you have some issues in the Ajax and PHP. Without having your complete implementation, I can't test this, but it should work.

PHP:

add_action('wp_ajax_email_exists_check', 'email_exists_check');
add_action('wp_ajax_nopriv_email_exists_check', 'email_exists_check');

function email_exists_check() {
    // Check nonce and email is set by ajax post.
    if ( isset( $_POST['email'] ) && wp_verify_nonce( 'check_nonce', 'security' ) ) {
        // Sanitize your input.
        $email = sanitize_text_field( wp_unslash( $_POST['email'] ) );
        // do check.
        if ( email_exists( $email ) ) {
            $response = true;
        } else {
            $response = false;
        }
        // send json and exit.
        wp_send_json( $response );
    }
}

And your jQuery:

$( document ).on(  "submit",  "#form",  function(e) {
    e.preventDefault();
    $email = $( this ).find( 'input[name=email]' ).val(); // email
    // ajax request, check if user exists.
    $.ajax({
        type: "POST",
        dataType: 'json',
        url: site_ajax.ajax_url,
        data: {
            email: $email,
            action: 'email_exists_check',
            security: site_ajax.check_nonce
            }
        })
        .done(function(data) {
            if (data.result) {
                alert( 'Email exists!' );
            } else {
                alert( 'Email doesn\'t exsist!' );
            }
        });
});