javascript AngularJS + $q，在多个ajax调用完成后做一些事情

AngularJS + $q, Do something after multiple ajax calls have finished

提问by Christos Baziotis

I need to load some data on page load and then do execute a task. in order to get the data i want i execute multiple different ajax calls. But in order to execute the task, i need all to make sure that all the ajax calls have finished. Here is what i have done so far:

我需要在页面加载时加载一些数据，然后执行任务。为了获得我想要的数据，我执行了多个不同的 ajax 调用。但是为了执行任务，我需要确保所有 ajax 调用都已完成。这是我到目前为止所做的：

$q.when(
        $http.get('url1').success(function (data) {
            $scope.data1 = data;
            console.log("ajax1 finished");
        }),
        $http.get('url2').success(function (data) {
            $scope.data2 = data;
            console.log("ajax2 finished");
        }),
        $http.get('url3').success(function (data) {
            $scope.data3 = data;
            console.log("ajax3 finished");
        }),
        $http.get('url4').success(function (data) {
            $scope.data4 = data;
            console.log("ajax4 finished");
        })
    ).then(
        console.log("All ajax calls have finished!"),
        executeTask()
    );

My problem is that the code in block then(...);is not executed after allthe ajax call have finished. I get something like this in my console:

我的问题是所有ajax调用完成后块中的代码then(...);没有执行。我在控制台中得到这样的信息：

ajax2 finished
ajax1 finished
All ajax calls have finished!
ajax3 finished
ajax4 finished

I must be doing something wrong. How can i make it work the way i want?

我一定做错了什么。我怎样才能让它按照我想要的方式工作？

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Edit: I tried the following like it was mentioned in the answers but i still face the same problem.

编辑：我尝试了以下内容，就像答案中提到的那样，但我仍然面临同样的问题。

$q.all([
    $http.get('url1').then(function (data) {
        $scope.data1 = data;
        console.log("");
    }),
    $http.get('url2').success(function (data) {
        $scope.data2 = then;
        console.log("ajax2 finished");
    }),
    $http.get('url3').then(function (data) {
        $scope.data3 = data;
        console.log("ajax3 finished");
    }),
    $http.get('url4').then(function (data) {
        $scope.data4 = data;
        console.log("ajax4 finished");
    })
]).then(
    console.log(""),
    executeTask()
);

回答by maurycy

I've made a working plunker for you with use of $q.all()

我已经为你制作了一个工作 plunker 使用 $q.all()

http://plnkr.co/edit/JHd3XPTKBxx4KRso5JRB?p=preview

http://plnkr.co/edit/JHd3XPTKBxx4KRso5JRB?p=preview

  $q.all([
    $http.jsonp('http://ip.jsontest.com/?callback=JSON_CALLBACK').then(function(response) {
      $scope.ip.one = response.data
      console.log('one')
    }),
    $http.jsonp('http://ip.jsontest.com/?callback=JSON_CALLBACK').then(function(response) {
      $scope.ip.two = response.data
      console.log('two')
    }),
    $http.jsonp('http://ip.jsontest.com/?callback=JSON_CALLBACK').then(function(response) {
      $scope.ip.three = response.data
      console.log('three')
    }),
    $http.jsonp('http://ip.jsontest.com/?callback=JSON_CALLBACK').then(function(response) {
      $scope.ip.four = response.data
      console.log('four')
    }),
  ]).then(function() {
    console.log('all')
  })

回答by Cétia

You have two solutions :

您有两种解决方案：

• You want to use $q.all()in order to wait for multiple promise to resolve. Example : http://jsfiddle.net/ThomasBurleson/QqKuk/

• Use the resolvemecanism of routeProvider in order to pre-load promise before rendering your screen : https://docs.angularjs.org/api/ngRoute/provider/$routeProvider

• 您要使用$q.all()以等待多个 promise 来解决。示例：http: //jsfiddle.net/ThomasBurleson/QqKuk/

• resolve在渲染屏幕之前使用routeProvider 的机制来预加载承诺：https://docs.angularjs.org/api/ngRoute/provider/$routeProvider