如何使控制器等待承诺从角度服务中解决 [英] How to make controller wait for promise to resolve from angular service

问题描述

我有一个向后端发出AJAX请求的服务

I have a service that is making an AJAX request to the backend

服务:

    function GetCompaniesService(options)
    {
        this.url = '/company';
        this.Companies = undefined;
        this.CompaniesPromise = $http.get(this.url);

    }

控制器:

var CompaniesOb = new GetCompanies();
CompaniesOb.CompaniesPromise.then(function(data){
   $scope.Companies = data;
});

我希望我的服务处理".then"函数而不是必须在我的控制器中处理它，并且我希望能够在服务内部的诺言之后，让我的控制器对来自该服务的数据进行处理已解决.

I want my service to handle the ".then" function instead of having to handle it in my controller, and I want to be able to have my controller act on that data FROM the service, after the promise inside the service has been resolved.

基本上，我希望能够像这样访问数据:

Basically, I want to be able to access the data like so:

var CompaniesOb = new GetCompanies();
$scope.Companies = CompaniesOb.Companies;

在服务本身内部处理承诺的解决方案.

With the resolution of the promise being handled inside of the service itself.

这可能吗?还是我只能从服务外部访问该诺言的解决方案?

Is this possible? Or is the only way that I can access that promise's resolution is from outside the service?

推荐答案

如果只想处理服务本身中$http的响应，则可以在要执行更多操作的服务中添加then函数然后从该then函数处理return，如下所示:

If all you want is to handle the response of $http in the service itself, you can add a then function to the service where you do more processing then return from that then function, like this:

function GetCompaniesService(options) {
  this.url = '/company';
  this.Companies = undefined;
  this.CompaniesPromise = $http.get(this.url).then(function(response) {
    /* handle response then */
    return response
  })
}

但是您仍将在控制器中使用Promise，但是您返回的内容将已在服务中得到处理.

But you'll still have use a promise in the controller, but what you get back will have already been handled in the service.

var CompaniesOb = new GetCompanies();
CompaniesOb.CompaniesPromise.then(function(dataAlreadyHandledInService) {
  $scope.Companies = dataAlreadyHandledInService;
});

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