Question

我试图发出一个简单的Ajax请求，以便在控制器中可以从db中获取数据并返回它。现在，我在视图上有以下代码：

id

此代码在控制器上

void callbackDispatcher() {
  Workmanager.executeTask((task, inputData){
    try {
      var connectivityResult = await (Connectivity().checkConnectivity());
      final result = await InternetAddress.lookup('google.com');
      if (connectivityResult == ConnectivityResult.mobile) {
        // I am connected to a mobile network.
        if (result.isNotEmpty && result[0].rawAddress.isNotEmpty) {
          print('connected');
        }
      } else if (connectivityResult == ConnectivityResult.wifi) {
        // I am connected to a wifi network.
        if (result.isNotEmpty && result[0].rawAddress.isNotEmpty) {
          print('connected');
        }
      }
    } on SocketException catch (_) {
      print('not connected');
    }
    return Future.value(true);
  });
}

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  Workmanager.initialize(
      callbackDispatcher, // The top level function, aka callbackDispatcher
      isInDebugMode: 
          false // If enabled it will post a notification whenever the task is running. Handy for debugging tasks
      );
  // Periodic task registration
  Workmanager.registerPeriodicTask("2", "syncfirebase",
      // When no frequency is provided the default 15 minutes is set.
      // Minimum frequency is 15 min. Android will automatically change your frequency to 15 min if you have configured a lower frequency.
      frequency: Duration(minutes: 15),
      initialDelay: Duration(seconds: 10),
      constraints: Constraints(networkType: NetworkType.connected));

  runApp(new MyApp());
}

如何在视图上回显变量$ enc的每一行？

Answer 1

首先，您不需要json_encode() $result变量，因为Laravel会为您处理。您目前的代码从技术上讲意味着您将需要再次解码数据。

第二，您实际上不需要使用response()->json()，因为从路由/控制器方法返回数组将始终自动转换为JSON。比起您实际需要，这更像是仅供参考。

将您的控制器方法更改为：

public function ajaxRequestPost(Request $request)
{
    return [
        'success' => 'Got Simple Ajax Request.',
        'lots'    => DB::select('select * from users'),
    ];
}

然后遍历结果，您可以使用for循环：

success: function (data) {
    for (var i = 0; i < data.lots.length; i++) {
        console.log(data.lots[i]);
    }
}

或者由于您使用的是jQuery $.each(...)：

success: function (data) {
    $.each(data.lots, function (index, item) {
        console.log(item);
    });
}

Ajax请求从数据库中获取数据并返回

1 个答案: