Question

我有一个异步休息电话。在调用其他所有内容后，将在最后检索响应。在进入下一步之前我需要响应。我计划实施承诺。在我的案例中，我不知道如何实现承诺。我的代码：

git config --global user.name xxx

当设置$ scope.savedDesc时，只有我想继续下一步。

请建议。提前谢谢。

Answer 1

更改

if($scope.savedDesc.length <= 0 && $scope.savedDesc != null && $scope.savedDesc != 'undefined') {
    access.getDesc($scope.id, function(data){
        $scope.savedDesc = data;
    });
}

// next step(s) here...

要

if($scope.savedDesc.length <= 0 && $scope.savedDesc != null && $scope.savedDesc != 'undefined') {
    access.getDesc($scope.id, function(data){
        $scope.savedDesc = data;

        // next step(s) here...
    });
}

Answer 2

如果access是angular $resource，您可以执行以下操作：

function nextStep(){
    //...do something with $scope.savedDesc...
}

$scope.savedDesc = access.getDesc($scope.id, nextStep);

// or

$scope.savedDesc = access.getDesc($scope.id);
//... (do something else)
$scope.savedDesc.$promise.then(nextStep);

Answer 3

您可以使用callback功能逐步执行。

if($scope.savedDesc.length <= 0 && $scope.savedDesc != null && $scope.savedDesc != 'undefined')
{
    access.getDesc($scope.id, function(data){
        $scope.savedDesc = data;
        noteDescCall($scope.savedDesc); // call foreach inside this function with $scope.saveDesc
    });
}

// your noteDescCall function which have `foreach` loop

function noteDescCall(savedDesc){
    // implementation with savedDesc ...
}

Answer 4

OP询问了承诺。这是一个简单的承诺链式示例：

MyAsyncRestCall()
  .then(function(result1) {
    // you can modify `result1` before returning it if you want
    return result1;
  })
  .then(function(result2) {
    // `result2` is the data returned from the above `then` (e.g. `result1`)
    // returning `result2` returns the value to the original caller
    return result2;
  })
  .catch(function(error) {
    // handle errors here if you want to
    return $q.reject({ message: JSON.stringify(error) });
  });

这是一篇关于承诺链的好文章：http://www.syntaxsuccess.com/viewarticle/angular-promise-chaining-explained

如何使用$ promise的angularjs

4 个答案: