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; })
