在 WordPress 中提交的 AJAX 表单无法正常工作（续...）

Question

这是我的问题here 的延续。我有一个带有 2 个下拉列表和 1 个输入提交的表单的自定义页面模板。当用户提交表单时，将显示结果，这是正常的。但是我有一个问题，在获取数据库中的数据时，浏览器会重新加载。

我正在尝试使用 AJAX 来防止刷新浏览器。我刚刚更新了functions.php 和JS 中的AJAX 函数。当用户单击提交按钮时，页面现在不刷新。但结果不显示。我正在使用is_page，在特定页面中显示不同的结果

如何解决这个问题？如何在 AJAX 中调用自定义 PHP 文件？

AJAX (functions.php)

function ajax_enqueue_sl(){
    wp_enqueue_script('ajax_load_sl', get_template_directory_uri().'/js/alternate-dropdown.js', array('jquery'));
    wp_localize_script('ajax_load_sl', 'ajax_object', array('ajax_url' => admin_url( 'admin-ajax.php')));
}
    add_action('wp_enqueue_scripts', ajax_enqueue_sl);

add_action('init', 'registerFormAction');
function registerFormAction(){
    // To handle the form data we will have to register ajax action. 
    add_action('wp_ajax_nopriv_submitAjaxForm','submitAjaxForm_callback');
    add_action('wp_ajax_submitAjaxForm','submitAjaxForm_callback');
}

function submitAjaxForm_callback(){
    global $wpdb;
    if(is_page(9208)){
        //ROCK ON!
        if (isset($_POST['store_list']) && $_POST['store_list'] != 'Select by Store'){
        $store_list = $_POST['store_list'];
        $stores= $wpdb->get_results($wpdb->prepare("SELECT street FROM tablename WHERE stores= '" . $store_list . "' AND col IN ('test') ORDER BY street ASC", OBJECT));
        foreach ($stores as $record_s){
            echo '<div class="records">';
            echo '<div><span class="icons-tabbed-store icon-icon-stores">' . $record_s->street . '</span></div>';
            echo '</div>';
        }
    } elseif (isset($_POST['mall_list']) && $_POST['mall_list'] != 'Select by Mall'){
        $mall_list = $_POST['mall_list'];
        $street = $wpdb->get_results($wpdb->prepare("SELECT stores FROM tablename WHERE street= '" . $street_list . "' AND col IN ('test') ORDER BY stores ASC", OBJECT));
        foreach ($street as $record_m){
            echo '<div class="records">';
            echo '<div><span class="icons-tabbed-store icon-icon-stores">' . $record_m->stores . '</span></div>';
            echo '</div>';
        }
    }
    }
    wp_die();
}

带 HTML 的 PHP (test.php)

$results_street = $wpdb->get_results('SELECT DISTINCT street FROM tablename WHERE code IN ("test1") ORDER BY street ASC', OBJECT);
$results_stores = $wpdb->get_results('SELECT DISTINCT stores FROM tablename WHERE code IN ("test2") ORDER BY stores ASC', OBJECT);

<form action='' method='post' name='myform' id="myform">
<div class="pos-div">
<select name="street_list" id="filterbystreet">
    <option name="default" class="filter_by" value="Select by">Select by</option>
    <?php
    foreach($results_street as $option){
        if(isset($_POST['street_list']) && $_POST['street_list'] == $option->street)
            echo '<option name="street_list" class="filter_by" selected value="'. $option->street .'">'. $option->street .'</option>';
        else    
         echo '<option name="street_list" class="filter_by" value="'. $option->street .'">'. $option->street .'</option>';
     };
    ?>
</select>
</div>
<span class="or">or</span>
<div class="pos-div">
<select name="store_list" id="filterby">
    <option name="default" class="filter_by" value="Select by">Select by</option>
    <?php 
    foreach($results_stores as $option){
        if(isset($_POST['store_list']) && $_POST['store_list'] == $option->stores)
            echo '<option name="store_list" class="filter_by" selected value="'. $option->stores .'">'. $option->stores .'</option>';
        else    
         echo '<option name="store_list" class="filter_by" value="'. $option->stores .'">'. $option->stores .'</option>';
     };
    ?>
</select>
</div>
<input type="submit" value="List all partner stores" class="pos-submit"/>
</form>

if (isset($_POST['store_list']) && $_POST['store_list'] != 'Select by Store'){
        $store_list = $_POST['store_list'];
        $stores= $wpdb->get_results($wpdb->prepare("SELECT street FROM tablename WHERE stores= '" . $store_list . "' AND code IN ('test3') ORDER BY street ASC", OBJECT));
        foreach ($stores as $record_s){
            echo '<div class="records">';
            echo '<div><span>' . $record_s->street. '</span></div>';
            echo '</div>';
        }
    } elseif (isset($_POST['street_list']) && $_POST['street_list'] != 'Select by'){
    $street_list = $_POST['street_list'];
    $streets = $wpdb->get_results($wpdb->prepare("SELECT street FROM tablename WHERE street_list= '" . $street_list. "' AND code IN ('test3') ORDER BY stores ASC", OBJECT));
    foreach ($streets as $record_m){
        echo '<div class="records">';
        echo '<div><span>' . $record_m->stores . '</span></div>';
        echo '</div>';
    }
}

ajax_js.js

    jQuery(document).ready(function($){
    //$('#myform').submit(ajaxFormSubmit);

    $('#filterbystreet').change(function(){
        $('#filterbystore').prop('selectedIndex','Select by Store');
    });

    $('#filterbystore').change(function(){
        $('#filterbystreet').prop('selectedIndex','Select by');
    });

    jQuery('.pos-submit').on('click',function(e){ 
        e.preventDefault(); 
        var myform = jQuery('#myform').serialize(); 

        jQuery.ajax({ 
            type:"POST", 
            // Get the admin ajax url which we have passed through wp_localize_script(). 
            url: ajax_object.ajax_url, 
            action: "submitAjaxForm", 
            data: myform, 
            success:function(data){ 
                jQuery(".records").html(data); 
                console.log(data);
            } 
        }); 
    });
});

Answer 1

首先wp_enqueue_scripts函数和wp_localize_script，你应该注册然后在函数中加入句柄，如codex中的例子

  // Register the script
  wp_register_script( 'ajax_load_sl', get_template_directory_uri().'/js/alternate-dropdown.js', array('jquery'));

  wp_localize_script('ajax_load_sl', 'ajax_object', array('ajax_url' => admin_url( 'admin-ajax.php'))););

  // Enqueued script with localized data.
  wp_enqueue_script( 'ajax_load_sl');

详细信息和示例here

在你的 php 脚本中，你没有提到它是否存在于一个函数中（我认为是这样，假设是这样），在函数的顶部，你需要添加

global $wpdb;

那么你可以使用$wpdb

tablename，永远不会被识别，你需要把 wp_posts 放在 wp_ 是你的表前缀，或者 $wpdb->prefix.'posts' 如果你不想关心前缀。

global $wpdb;

$results_street = $wpdb->get_results('SELECT DISTINCT street FROM wp_posts WHERE code IN ("test1") ORDER BY street ASC', OBJECT);
$results_stores = $wpdb->get_results('SELECT DISTINCT stores FROM wp_posts WHERE code IN ("test2") ORDER BY stores ASC', OBJECT);

用您正确的数据库名称更改 wp_posts。

告诉我之后它是否有效！