AngularJS：连续发送$ http.get请求直到某个条件 [英] AngularJS: Send $http.get requests continuously until certain condition

问题描述

正如标题所说，我想发送$ http.get请求到服务器，直到返回的结果符合条件。

As the title says, I want to send $http.get requests to the server until the returned results meets a condition.

这就是我试过的：

    var searchComplete = false;
    var sendGetReq = true;

    while(!searchComplete) // #2 and then jumps here
    {
       if(sendGetReq)
       {
         sendGetReq = false;  // #1 execution reaches here
         $http.get('/user/getCondition', {params: {condition: $scope.condition}).
        success(function (condition, status, headers, config) {
         ...
         ...
         if(condition)
         { searchComplete = true; }
         else
         { sendGetReq = true; }
    }
}

但是，$ http.get请求永远不会执行，这个语句永远不会到达，当我调试时，我看到执行将会到 sendGetReq = false ，然后跳转到 while（！searchComplete）。GET请求永远不会被发送。

However, the $http.get request never goes. That statement is never reached. When I debugged, I saw that execution will come to sendGetReq=false and then jump to while(!searchComplete). The GET request is never sent.

有人请解释：

1. 为什么执行永远不会到达GET请求并跳回


2. 建议连续执行此操作的方式是什么GET请求

谢谢。

Thank you.

推荐答案

为什么不把它们放在一个函数中，并在条件满足的情况下自行调用呢？就像这样，你应该使用.then而不是.success：

Why not put it all together inside a function and call itself if condition is meet? Like this and you should use .then and not .success:

$scope.load = function(){
  $http.get('/user/getCondition', {params: {condition: $scope.condition}).
    then(function (condition, status, headers, config) {

    if (condition){
       $scope.load();
    }

  });
}

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