從ajax調用返回的PHP為空

Question

我用ajax調用php函數，但是我從php函數返回的內容為空？

這是我的ajax電話：

    showEvent : function(eventId){

        $.ajax({
           type: "POST",
            url: "routing.php?page=Events&action=showEvent",
            data : {event_id :eventId},
            dataType : "text",
            success: function(data){
                console.log(data);
                $('#showEvent').modal("show");
                $('#showClickedEvent').children("tr").val("test");
            },
            error: function(xhr,status,e){
                console.log(xhr);
                console.log(status);
                console.log(e);
            }
        });
    }

和hier我的PHP功能：

function call($page,$action){

    require_once("Controller/".$page."Controller.php");
    $request = array_merge($_GET,$_POST);

    switch($page)
    {
        case "Index":
            switch($action)
            {
                case "home":
                    return IndexController::home();
                break;

                case "login":
                    return IndexController::login();
                break;
            }
        case "Events":
            switch($action)
            {
                case "createEvent":
                    return EventsController::createEvent();
                break;

                case "setEvent":
                    EventsService::setEvent($request["homepartyName"],$request["date"],$request["musicDirection"],
                        $request["ageFrom"],$request["ageTo"],$request["maxPersons"],$request["country"],$request["city"],$_COOKIE["facebook_id"]);
                    break;

                case "showEvents":

                break;

                case "myEvents":
                    return EventsController::myEvents();
                break;

                case "showEvent":
                    return EventsService::getEvent($request["event_id"]);
                break;

            }
        case "User":
            switch($action)
            {
                case "createUser":
                    UserService::setUser($request["facebookData"]);
                    break;

                case "logoutUser":
                    UserController::logoutUser();
                    break;
            }

    }
}

此方法由我的Eventservice調用：

public static function getEvent($id){

    $db = parent::getInstance();
    $stmt = "SELECT * FROM events WHERE id = ".$id."";

    $event = $db->query($stmt)->fetch_all(MYSQLI_ASSOC) or die($db->error);

    header('Content-Type: application/json; charset=utf8');
    return json_encode($event);
}

我不知道為什么退貨是空的：/

Answer 1

請在ajax函數中更改dataType：'JSON' ，因為我們試圖從ajax響應而不是文本中獲取JSON。

還可以使用exit（json_encode（$ event））而不是返回json_encode（$ event）來獲取正確的json響應。