angular js在间隔上更新json并更新视图

Question

我一直试图在互联网上找到一个解决方案,能够在设定的间隔时间更新我的$ http json请求,同时让它用新数据更新我的绑定.

我已经看到一些使用$ timeout的例子但是无法让它工作,只是想知道最好的方法是什么.由于我无法提出新请求,因此我无法解决新数据下拉后更新视图的问题.

这是我目前的构建.

app.js文件,这只显示了json的初始提取.

    var myApp = angular.module('myApp', ['ngRoute']);

    myApp.controller('MainCtrl', ['$scope', '$http',
        function($scope, $http, $timeout) {
            $scope.Days = {};

            $http({
                method: 'GET',
                url: "data.json"
            })
                .success(function(data, status, headers, config) {
                    $scope.Days = data;
                })
                .error(function(data, status, headers, config) {
                    // something went wrong :(
                });

        }
    ]);

HTML设置:

<ul ng-controller="MainCtrl">
  <li class="date" ng-repeat-start="day in Days">
    <strong>>{{ day.Date }}</strong>
  </li>

  <li class="item" ng-repeat-end ng-repeat="item in day.Items">
    <strong>>{{ item.Name }}</strong>
  </li>
</ul>

Answer 1

我会用$timeout.

如你所知,$timeout回报承诺.因此,当承诺得到解决时,我们可以myLoop再次调用方法.

在下面的示例中,我们每隔10秒调用一次http.

var timer;

function myLoop() {
    // When the timeout is defined, it returns a
    // promise object.
    timer = $timeout(function () {
        console.log("Timeout executed", Date.now());
    }, 10000);

    timer.then(function () {
        console.log("Timer resolved!");

        $http({
            method: 'GET',
            url: "data.json"
        }).success(function (data, status, headers, config) {
            $scope.Days = data;
            myLoop();
        }).error(function (data, status, headers, config) {
            // something went wrong :(
        });
    }, function () {
        console.log("Timer rejected!");
    });

}

myLoop();

作为旁注:

当控制器被销毁时一定要打电话 $timeout.cancel( timer );

// When the DOM element is removed from the page,
// AngularJS will trigger the $destroy event on
// the scope. 
// Cancel timeout
$scope.$on("$destroy", function (event) {
    $timeout.cancel(timer);
});

演示 Fiddle