Angular.js延迟控制器初始化 [英] Angular.js delaying controller initialization

问题描述

我想延迟控制器的初始化直至必要的数据已经从服务器到达

I would like to delay the initialization of a controller until the necessary data has arrived from the server.

我发现这个解决方案的角度1.0.1：延迟AngularJS路线改变，直到模型加载到prevent闪烁，但无法得到它与角1.1.0工作

I found this solution for Angular 1.0.1: Delaying AngularJS route change until model loaded to prevent flicker, but couldn't get it working with Angular 1.1.0

模板

<script type="text/ng-template" id="/editor-tpl.html">
Editor Template {{datasets}}
</script>
    <div ng-view>
</div>

的JavaScript

function MyCtrl($scope) {    
    $scope.datasets = "initial value";
}

MyCtrl.resolve = {
    datasets : function($q, $http, $location) {
        var deferred = $q.defer();

        //use setTimeout instead of $http.get to simulate waiting for reply from server
        setTimeout(function(){
            console.log("whatever");
            deferred.resolve("updated value");
        }, 2000);

        return deferred.promise;
    }
};

var myApp = angular.module('myApp', [], function($routeProvider) {
    $routeProvider.when('/', {
        templateUrl: '/editor-tpl.html',
        controller: MyCtrl,
        resolve: MyCtrl.resolve
    });
});​

http://jsfiddle.net/dTJ9N/1/

推荐答案

由于$ HTTP返回一个承诺，这是一个性能命中创建自己的延期只是当HTTP数据到达返回的承诺。你应该能够做到：

Since $http returns a promise, it's a performance hit to create your own deferred just to return the promise when the http data arrives. You should be able to do:

MyCtrl.resolve = {
    datasets: function ($http) {
        return $http({method: 'GET', url: '/someUrl'});
    }
};

如果你需要做的结果的一些处理，使用。于是，和你的承诺被链接在免费：

If you need to do some processing of the result, use .then, and your promise is chained in for free:

MyCtrl.resolve = {
    datasets: function ($http) {
        return $http({method: 'GET', url: '/someUrl'})
               .then (function (data) {
                   return frob (data);
               });
    }
};

这篇关于Angular.js延迟控制器初始化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！