Wordpress插件仅在登录时有效

Question

我创建了一个插件，它利用了wp_ajax_no_priv_action，以便在注销时允许访问。但是，当您登录时，插件只会将数据拉入下拉框。

我在这里俯瞰什么？

<?php

/**
 * Plugin Name: Gyms
 * Plugin URI: http://www.gyms.com
 * Description: This plugin performs dynamic region updates into select boxes in WordPress
 * Version: 1.0.0
 * Author: Me
 * Author Email: 
 * License: GPL2
 */
function getregions_scripts() {
  wp_enqueue_script(
    'getregions-script',
    plugin_dir_url(__FILE__) . "assets/getregions.js",
    array('jquery'),
    '1.0',
    true
  );

  wp_localize_script(
    'getregions-script', // this needs to match the name of our enqueued script
    'gymRegions',      // the name of the object
    array('ajaxurl' => admin_url('admin-ajax.php')) // the property/value
  );
}
add_action( 'wp_enqueue_scripts', 'getregions_scripts' );

add_action( 'wp_ajax_showcountries', 'showcountries_callback' );
add_action( 'wp_ajax_no_priv_showcountries', 'showcountries_callback' );
function showcountries_callback() {
include_once("pdo_mysql.php");

pdo_connect("localhost","user","password");
pdo_select_db("wpdb");


$makeselection=$_POST["makeselection"];

if($makeselection=="getCountryList"){
        $showcountry = pdo_query("Select data from usertbl");

   if (!$showcountry) {
       $message  = 'Invalid query: ' . pdo_error() . "\n";
       $message .= 'Whole query: ' . $showcountry;
       die($message);
   }else{
       $html = "<option value=''>Select Country</option>";
       foreach($showcountry as $row){
          $html .= "<option value='{$row[meta_value]}'>{$row[COUNTRY_NAME]}</option>";
       }
       echo json_encode($html, JSON_PRETTY_PRINT);
   }
}
..........

wp_die();
}

function showcountries_frontend() {
$the_html = '
<form id="MyForm">
    <div style="float: left">
        <select id="CountryList" onchange="getCities()" style="width: 150px !important; min-width: 150px; max-width: 150px;"></select>
        <select id="CityList" onchange="getTowns()" style="width: 150px !important; min-width: 150px; max-width: 150px;"></select>
        <select id="TownList" style="width: 150px !important; min-width: 150px; max-width: 150px;"></select>
        <select id="CategoriesList" style="width: 170px !important; min-width: 170px; max-width: 170px;"></select>
    </div>
</form>';
return $the_html;
}
add_shortcode("sc_frontend", "showcountries_frontend");
?>

插件/资产/ getregions.js

function initialize($) {
    feedData($);
    categoriesData($);
}

jQuery(document).ready(function ($) { initialize($); });

function feedData($) {
    jQuery(document).ready(function ($) {
        console.log("feedData is successfully hit.");
        var serialized = $('#MyForm').serialize();
        $.ajax({
            cache: false,
            type: "POST",
            async: false,
            url: gymRegions.ajaxurl,
            data:{action: "showcountries", makeselection: "getCountryList", serialized}, //In wordpress the action: value must match the name of the callback function in the php file. In this case, showcountries_callback. Otherwise 0 is returned in success:
            dataType: "json",
            success: function (data, status, error) {
                //$('#CountryList').append(data);
                console.log(data);
                console.log(status);
                console.log(error);
            },
            error: function (data, status, error) {
                console.log(data);
                console.log(status);
                console.log(error);
            }
        });
    });
}

function categoriesData($){
    jQuery(document).ready(function ($) {
        console.log("categoriesData is successfully hit.");
        var serialized = $('#MyForm').serialize();
        $.ajax({
            cache: false,
            type: "POST",
            async: false,
            url: gymRegions.ajaxurl,
            data:{action: "showcountries", makeselection: "categoriesList", serialized},
            dataType: "json",
            success: function (data) {
                //console.log(data);
                 $('#CategoriesList').append(data);
            },
            error: function (data, status, error) {
                console.log(data);
                console.log(status);
                console.log(error);
            }
        });
    });    
}

.......

我从调试成功获得的读数：函数feedData（）的一部分，内容如下：

0

success

Object { readyState: 4, getResponseHeader: .ajax/w.getResponseHeader(), getAllResponseHeaders: .ajax/w.getAllResponseHeaders(), setRequestHeader: .ajax/w.setRequestHeader(), overrideMimeType: .ajax/w.overrideMimeType(), statusCode: .ajax/w.statusCode(), abort: .ajax/w.abort(), state: .Deferred/d.state(), always: .Deferred/d.always(), then: .Deferred/d.then(), 12 more… }