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AngularJS快速入门指南07:Http对象

时间:2015-08-07 16:58来源:网络整理 作者:KKWL 点击:
$http是AngularJS提供的一个服务,用来从远程服务器读取数据。 提供数据 下面的数据由Web服务器提供: { "records" : [ { "Name" : "Alfreds Futterkiste" , "City" : "Berlin" , "Country" : "Germany" }, { "Name" :

  $http是AngularJS提供的一个服务,用来从远程服务器读取数据。


提供数据

  下面的数据由Web服务器提供:

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{
"records": [
  {
    "Name" : "Alfreds Futterkiste",
    "City" : "Berlin",
    "Country" : "Germany"
  },
  {
    "Name" : "Berglunds snabbköp",
    "City" : "Luleå",
    "Country" : "Sweden"
  },
  {
    "Name" : "Centro comercial Moctezuma",
    "City" : "México D.F.",
    "Country" : "Mexico"
  },
  {
    "Name" : "Ernst Handel",
    "City" : "Graz",
    "Country" : "Austria"
  },
  {
    "Name" : "FISSA Fabrica Inter. Salchichas S.A.",
    "City" : "Madrid",
    "Country" : "Spain"
  },
  {
    "Name" : "Galería del gastrónomo",
    "City" : "Barcelona",
    "Country" : "Spain"
  },
  {
    "Name" : "Island Trading",
    "City" : "Cowes",
    "Country" : "UK"
  },
  {
    "Name" : "Königlich Essen",
    "City" : "Brandenburg",
    "Country" : "Germany"
  },
  {
    "Name" : "Laughing Bacchus Wine Cellars",
    "City" : "Vancouver",
    "Country" : "Canada"
  },
  {
    "Name" : "Magazzini Alimentari Riuniti",
    "City" : "Bergamo",
    "Country" : "Italy"
  },
  {
    "Name" : "North/South",
    "City" : "London",
    "Country" : "UK"
  },
  {
    "Name" : "Paris spécialités",
    "City" : "Paris",
    "Country" : "France"
  },
  {
    "Name" : "Rattlesnake Canyon Grocery",
    "City" : "Albuquerque",
    "Country" : "USA"
  },
  {
    "Name" : "Simons bistro",
    "City" : "København",
    "Country" : "Denmark"
  },
  {
    "Name" : "The Big Cheese",
    "City" : "Portland",
    "Country" : "USA"
  },
  {
    "Name" : "Vaffeljernet",
    "City" : "Århus",
    "Country" : "Denmark"
  },
  {
    "Name" : "Wolski Zajazd",
    "City" : "Warszawa",
    "Country" : "Poland"
  }
]
}
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AngularJS $http

  AngularJS $http是一个从Web服务器读取数据的核心服务。

  $http.get(url)是一个用来从服务器读取数据的函数。

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<div ng-app="myApp" ng-controller="customersCtrl"> 

<ul>
  <li ng-repeat="x in names">
    {{ x.Name + ', ' + x.Country }}
  </li>
</ul>

</div>

<script>
var app = angular.module('myApp', []);
app.controller('customersCtrl', function($scope, $http) {
    $http.get("http://example.php")
    .success(function(response) {$scope.names = response.records;});
});
</script>
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代码解释:

  AngularJS application通过ng-app指令定义。application在<div>元素内运行。

  ng-controller指令定义了控制器的名称。

  customersCtrl函数是一个标准的JavaScript对象构造函数。

  AngularJS通过$scope$http对象调用customersCtrl函数。

  $scope是一个appliation object(即application的变量及函数的所有者)。

  $http是一个用来请求外部数据的XMLHttpRequest object

  $http.get()函数从服务器读取JSON数据

  如果成功的话,控制器将在$scope对象中创建一个names属性,并将从服务器端返回的JSON数据赋值给这个属性。

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