$wpdb使用AJAX，但显示AJAX错误而不是成功

是否有人会指导此代码为何不起作用。甚至数据也会发生变化。这是我使用的ajax。

jQuery(document).ready(function($) {
    $(".ue_ajax_enabled").on(\'click\', function(event) {
        event.preventDefault();
        /* Act on the event */
        $.ajax({
            url:  ue_ajax.ajax_url,
            type: \'POST\',
            /*dataType: \'json\',*/
            data: {
                \'action\'    : \'ue_ajax_enabled\',
                \'new_username\'  : $("#new_username").val(),
                \'nonce\'     : $("#new_username_nonce_check").val(),
            },
            beforeSend: function () {
                $(".ue_ajax_enabled").text(ue_ajax.beforeMessage);
            },
            success: function (data) {
                console.log(\'Success\');
                console.log(data);
            },
            error: function (data) {
                console.log(\'Error\');
                console.log(data);
            }
        })
        
    });
});

这是我使用的ajax动作挂钩。

    add_action( "wp_ajax_ue_ajax_enabled", \'ue_ajax_enabled\' );
    
    function ue_ajax_enabled() {
    global $wpdb;

    $currentUser = wp_get_current_user();
    $user_id = $currentUser->ID;

    if (  is_user_logged_in() && wp_verify_nonce( $_REQUEST[\'nonce\'], \'new_username_nonce\' ) && ! empty($_REQUEST[\'new_username\'])) {

        // Get name of our users table
        $tableName = $wpdb->prefix . \'users\';

        if ( !username_exists( $_REQUEST[\'new_username\'] ) ) {
            // Stripslashes and trim any whitespace, also replace whitespace with underscore
            $newUsername = trim(str_replace(\' \', \'_\', stripslashes($_REQUEST[\'new_username\'])));
        } else {
            echo json_encode( array(\'username\' => \'Username exists, try any other\') );
            die();
        }

        // Data to change
        $dataToChange = array(\'user_login\' => $newUsername);

        // Where to Change
        $whereToChange = array(\'ID\' => $user_id); 

        // Change the data inside the table
        $result = $wpdb->update($tableName, $dataToChange, $whereToChange, array(\'%s\'), array(\'%d\'));


        if ($result) {
            echo json_encode( array(\'update\' => true) );
        } else {
            echo json_encode( array(\'update\' => false) );
            die();
        }

        if (ue_send_email_to_user()) {
            $subject = \'Username Changed Successfully ID:\' . $user_id;
            $message = "<p>You username has been successfully changed. Your new details are given below.</p>";
            $message .= "<strong>Previous Username:</strong><span>{$currentUser->user_login}</span>";
            $message .= "<strong>New Username</strong><span>{$newUsername}</span>";
            $from = "From: " . get_bloginfo(\'name\');

            wp_mail( array(ue_get_administrators_email(), $currentUser->email), $subject, $message, $from );
        }
    }
    die();
}

代码在控制台中抛出错误消息，而不是前面设置的ajax的成功消息。任何关于为什么会发生这种情况的线索。提前感谢

UPDATE: by commenting datatype the problem solves. But still it shows undefined when i access json.

function my_ajax_callback1() { // Invalid JSON response. die(); } function my_ajax_callback2() { // Good JSON response with a Content-Type header. header( \'Content-Type: application/json\' ); echo json_encode( array( \'update\' => true ) ); wp_die(); // die() works, but wp_die() is better }

function my_ajax_callback4() { // ... your code // In your success( data ) JS, you\'d access the \'update\' value via data.data.update if ( $result ) { wp_send_json_success( array( \'update\' => true, \'msg\' => \'Success!\' ) ); } else { wp_send_json_error( array( \'update\' => false, \'msg\' => \'Foo error\' ) ); } }

“Add to Cart”链接css类“ajax_add_to_cart”不会显示在WooCommerce的小工具侧栏中

我创建了Woocmerce小部件，它将按产品类别创建循环。产品循环结果应与woocommerce默认内容产品相同。php文件。循环（属性、链接等）中的一切都很好，除了css class. 我不知道我到底把事情搞砸了，but i guess the main problem is within $defaults variable or in woocommerce_loop_add_to_cart_args filter. 请有人帮帮我。这是我的密码-function widget($args, $ins

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