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[Java教程]AngularJS中获取数据源的几种方式


 

在AngularJS中,可以从$rootScope中获取数据源,也可以把获取数据的逻辑封装在service中,然后注入到app.run函数中,或者注入到controller中。本篇就来整理获取数据的几种方式。


■ 数据源放在$rootScope中

 

var app = angular.module("app",[]);app.run(function($rootScope){  $rootScope.todos = [    {item:"",done:true},    {item:"",done:false}  ];})<div ng-repeat="todo in todos">  {{todo.item}}</div><form>  <input type="text" ng-model="newTodo" />  <input type="submit" ng-click=""todos.push({item:newTodo, done:false}) /></form>

 

以上,把数据源放在$rootScope中的某个字段中,很容易被重写。

■ 数据源放在service中,把servie注入到run函数中

 

app.service("TodoService", function(){  this.todos = [    {item:"",done:true},    {item:"",done:false}  ];   })app.run(function($rootScope, TodoService){  $rootScope.TodoService = TodoService;}) <div ng-repeat="todo in TodoService.todos">  {{todo.item}}</div><form>  <input type="text" ng-model="newTodo" />  <input type="submit" ng-click=""TodoService.todos.push({item:newTodo, done:false}) /></form>

 

在html中似乎这样写比较好:

<input type="submit" ng-click=""TodoService.todos.addodo(newTodo) />

在service中增加一个方法:

app.service("TodoService", function(){  this.todos = [    {item:"",done:true},    {item:"",done:false}  ];    this.addTodo = fucntion(newTodo){    this.todos.push({item:newTodo, done:false})  }   })

 

■ 数据源放在service中,把servie注入到controller中

 

app.controller("TodoCtrl", function($scope, TodoService){  this.TodoService = TodoServce;})

 

在对应的html中:

 

<body ng-app="app" ng-controller="TodoCtrl as todoCtrl">  <div ng-repeat="todo in todoCtrl.TodoService.todos">    {{todo.item}}  </div></body><form>  <input type="text" ng-model="newTodo" />  <input type="submit" ng-click="todoCtrl.TodoService.addTodo(newTodo)"/></form>

 

■ 数据源放在service中,把servie注入到controller中,与服务端交互

在实际项目中,service还需要和服务端交互。

 

var app = angular.module("app",[]);app.service("TodoService", function($q, $timeout){  this.getTodos = function(){    var d = $q.defer();        //模拟一个请求    $timeout(function(){      d.resolve([        {item:"", done:false},        ...      ])    },3000);        return d.promise;  }    this.addTodo = function(item){    this.todos.push({item:item, done:false});  }})app.controller("TodoCtrl", function(TodoService){  var todoCtrl = this;    TodoService.getTodos().then(function(result){    todoCtrl.todos = result;  })    todoCtrl.addTodo = TodoService.addTodo;})