我使用jQuery Ajax form post将消息写入db表，如下所示：

functions.php

add_action(\'wp_ajax_send_projectmessage\', \'send_projectmessage\');
function send_projectmessage() {
    global $wpdb;
    $wpdb->insert( //insert stuff to db table));

    wp_send_json_success();    
}

JS:

$(\'#form-pm\').on(\'submit\',function(e) {

        var mydata = { 
            \'action\': \'send_projectmessage\',
            \'projectid\': projectid,  
            \'message\': message
        };

        var ajaxRequest =
        $.ajax({
            url: admin_ajax.ajax_url,
            type: \'post\',
            data: mydata
        });

        ajaxRequest.done(function(data) { console.log(data); });
        ajaxRequest.fail(function(jqXHR) { alert(jqXHR); });

        e.preventDefault();
});

一切正常，数据被插入到我的数据库表中。

现在，这是我显示消息的方式：

<div id="messages">
    <?php
    $messages = load_projectmessages($projectid);

    foreach ($messages as $message) {
    //make a <table><tr><td> with $message->themessage
    }
    ?>
</div>

<form id="form-pm>
    <!-- input fields and submit here -->
</form>

load_projectmessages 在同一个functions.php:

function load_projectmessages($projectid) {
    global $wpdb;
    $sql_displaymessages = $wpdb->prepare("sql stuff", $projectid );
    $projectmessages = $wpdb->get_results($sql_displaymessages);
    return $projectmessages;
    wp_die();
}

我的问题是，where/when 我要打电话吗load_projectmessages? 我是否应该修改整个JS ajax代码来同时显示新数据？

add_action(\'wp_ajax_send_projectmessage\', \'send_projectmessage\');
function send_projectmessage() {
    global $wpdb;
    $wpdb->insert( //insert stuff to db table));

    // Call your function to retrieve your data and send it to browser
    $messages = load_projectmessages($projectid);

    wp_send_json_success($messages);    
}

ajaxRequest.done(function(data) { console.log(data); });

ajaxRequest.done(function(data) { 
    // Put markup for retrieved data here
    // for example 

    var o = "<table><tr><td>Project ID</td><td>Message</td></tr>";

    for (i=0; i<=data.length; i++){
        o .=  "<tr><td>"+data.projectid+"</td><td>"+data.message"+</td></tr>";
    }

    o .=   "</table>";

    $(#messages).html(o); 

 });

function load_projectmessages($projectid) {
    global $wpdb;
    $sql_displaymessages = $wpdb->prepare("sql stuff", $projectid );

    // Add ARRAY_A to get result in an associative array
    $projectmessages = $wpdb->get_results($sql_displaymessages, ARRAY_A);
    return $projectmessages;

    // Not needed
    // wp_die();
}