Question

有没有办法向调用服务的函数添加回调方法在一个函数我调用多个服务方法，我想设置一个回调方法到该函数。我试过这个但没有运气

$scope.MyFunction() = function()
{
    //Multiple Service calls
    $scope.callService1 = service.CallService1() //returns true on success
    $scope.callService2 = service.CallService2() //returns true on success
    $scope.callService3= service.CallService3() //returns true on success

    if($scope.callService1  && $scope.callService2 && $scope.callService3)
    {
        $scope.CallbackMethod ();
    }
}

$scope.CallbackMethod = function()
{
    alert('CallbackMethod')
}

我也尝试了这个，但它不同步，因为服务调用需要一些时间。

$scope.MyFunction() = function(CallbackMethod)
{
    //Refer Above Code
}

CallService服务方法就像

一样简单

$http.post('/InstStrategy/ReadAll').then(function (response) {
    return true
});

Answer 1

假设CallService1，CallService2和CallService3是异步方法，它们应该返回延迟的承诺。例如：

this.CallService1 = function() {
  // Once the result is available resolve the promise.
  return $http.post('/InstStrategy/ReadAll').then(function(response) {
    return true;
  });
}

现在，是时候定义你的功能了：

$scope.MyFunction = function(callback) {
  var callService1 = service.CallService1(),
      callService2 = service.CallService2(),
      callService3 = service.CallService3();

  // We want to wait for all these three methods to complete.
  $q.all([callService1, callService2, callService3])
    .then(function(results)) {
          // Results is an array containing the results of each of your service calls.
          var allTrue = true;
          angular.forEach(results, function(result) {
            if (!result) allTrue = false;
          });

          // If all the service calls where true, perform our callback.
          if (allTrue) callback();
    });
};

请注意，allTrue检查不是必需的，因为promises系统地解析为true。

添加回调到angularjs服务方法

1 个答案: