您好，我目前正在开发wordpress应用程序。我已经能够完成应用程序所需的几乎所有内容。我甚至能够使用Jquery Ajax将数据插入到我的自定义数据库表中，并获得提交的背景反馈。

但我现在的目标是根据下拉选择自动填充文本字段。我在网上读了几篇文章，我在这里看到了答案Why is my AJAX call not working? 但我仍然无法解决问题，以下是我的代码：

/* Fetching file from the database*/
wp_enqueue_script(\'jquery\');
function ajaxAutopopulate() {
    // The $_REQUEST contains all the data sent via ajax
    if ( isset( $_REQUEST[\'package\'] ) ) {

        $birdday = $_REQUEST[\'package\'];   // department day

        global $wpdb;
        // Let\'s take the data that was sent and do something with it
        $results = $wpdb->get_results("SELECT body_weight, daily_intake, fcr FROM bird_weight WHERE day=$birdday");

        $users_arr = array();

        foreach ( $results as $result ) {
            $bweight     = $result->body_weight;
            $dintake     = $result->daily_intake;
            $fcr         = $result->fcr;
            $users_arr[] = array("body_weight" => $bweight, "daily_intake" =>$dintake,"fcr"=>$fcr);
        }

        // encoding array to json format
        echo json_encode( $users_arr);

    } else {
        echo "error";
    }

    // Always die in functions echoing ajax content
    die();
}
add_action( \'wp_ajax_ajaxAutopopulate\', \'ajaxAutopopulate\' );
add_action( \'wp_ajax_nopriv_ajaxAutopopulate\', \'ajaxAutopopulate\' ); 

//The Html Form on the frontend
echo
    \'<form action="" name="mybirdweight" method="post">
        <div>
            <select id="days" name="days">
                <option value=" " > Select Your Bird Age</option>
                <option value="1"> 1</option>
                <option value="2"> 2</option>
            </select>
        </div>
        <div>
            <p>Body Weight</p>
            <input id="bweight" type="text" name="bweight" value=""/>
        </div>
        <div>
            <p>Daily Intake</p>
            <input id="dintake" type="text" name="dintake" value=""/>
        </div>
        <div>
            <p>FCR</p>
            <input id="fcr" type="text" name="fcr" value=""/>
        </div>
    </form>\';

//Here is the jquery-ajax javascript

/* the jquery ajax request*/
echo <<< END
    <script type="text/javascript">  
        jQuery(document).ready(function(){
            // On change of the dropdown do the ajax
            jQuery("#days").change(function() {
                var package = jQuery(this).val();
                jQuery.ajax({
                    // Change the link to the file you are using
                    url: "/wp-admin/admin-ajax.php",
                    type: \'POST\',
                    // This just sends the value of the dropdown
                    data: {package: package},
                    success: function(response) {
                        // Parse the jSON that is returned
                        // Using conditions here would probably apply
                        // incase nothing is returned
                        var Vals =JSON.parse(response);
                        // These are the inputs that will populate
                        jQuery("input[name=\'bweight\']").val(Vals.body_weight);
                        jQuery("input[name=\'dintake\']").val(Vals.daily_intake);
                        jQuery("input[name=\'fcr\']").val(Vals.fcr);

                    }
                });
            });
        });
    </script>
END;