WordPress AJAX in plugin response 0

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I create plugin for WordPress and use AJAX in plugin but AJAX response 0. I try to solve this problem by following this answer but can’t solve my problem.

This is my handler function

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if( is_admin())  {
    add_action( 'admin_menu', 'language_redirect_add_config_page' );
}
else {
    add_action( 'plugins_loaded', 'preference_language' );
    add_action( 'wp_enqueue_scripts', 'enqueue' );
    add_action( 'wp_ajax_preference_language', 'preference_language' );
    add_action( 'wp_ajax_nopriv_preference_language', 'preference_language' );
}

function language_redirect_config_page() {
    add_options_page( __( 'Language Redirect Setting' ), __( 'Language Redirect' ), 'manage_options', basename( __FILE__ ), '' );
}

function enqueue() {
    wp_enqueue_script( 'ajax-script', plugins_url( '/js/plugin-script.js', __FILE__ ), array('jquery') );
    wp_localize_script( 'ajax-script', 'ajax_object', array( 
        'ajax_url' => admin_url( 'admin-ajax.php' )
        ) 
    );
}

// Handler function...
function preference_language() {
    $language = $_POST['language'];
    if($language == 'th') {
        header( 'Location: ' . site_url('th') );
    }
    else {
        return;
    }
    die;
}

And this my AJAX script 

jQuery(document).ready(function($) {
    var language = localStorage.getItem('language');
    var data = {
        action: 'preference_language',
        language: language
    };
    $.post(
        ajax_object.ajax_url, 
        data, 
        function(response) {
            console.log(response);
    });
});
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3 comments

  1. Try replacing the

    die;

    with

    exit;

    the 0 error is a default error in wordpress for ajax most of the time it is die; will break everything. hope this helps

  2.  header( 'Location: ' . site_url('th') );

    You can’t set headers after output has been rendered. Remember ajax is called from the frontend and obviously output has already started.

    heres an way of doing this (untested):

    function preference_language() {
      $language = $_POST['language'];
      if($language == 'th') {
        echo site_url('th');
      } else {
        return;
      }
   exit;
}

    js

    jQuery(document).ready(function($) {
    var language = localStorage.getItem('language');
    var data = {
        action: 'preference_language',
        language: language
    };
    $.post(
        ajax_object.ajax_url, 
        data, 
        function(response) {
            window.location = response;
    });
});

  3. Are you quite sure that

     localStorage.getItem('language')

    actually holds a value that is or could be ‘th’?

    To be sure that your code works you could use the following code instead of your current preference_language():

    function preference_language() {
    $language = $_POST['language'];
    if($language == 'th') {
        echo "language is th.";
    }
    else {
        echo "language is not th.";
    }
    die;
}