当前位置:/AngularJS API/ng/指令(directive)/ngRepeat

ng

该指令为集合中的每项都实例化一个模块。每个模块都有自己的scope,给定的循环变量将被设置为当前项,$index是他们的索引。


用法

做为标签

<ng-repeat
  ng-repeat="repeat_expression">
...
</ng-repeat>

做为属性

<ANY
  ng-repeat="repeat_expression">
...
</ANY>

变量

循环中的特殊变量,包括:

变量 类型 描述
$index number 当前索引。
$first boolean 当循环的对象存在第一项时为true。
$middle boolean 当循环的对象存在中间项时为true。
$last boolean 当循环对象存在最后一项时为true。
$even boolean 循环的对象在当前位置的"$index"(索引)是偶数则为true,否则为false。
$odd boolean 循环的对象在当前位置的"$index"(索引)是奇数则为true,否则为false。

实例

<div ng-controller="repeatController">
  I have {{friends.length}} friends. They are:
  <input type="search" ng-model="q" placeholder="filter friends..." aria-label="filter friends" />
  <ul class="example-animate-container">
    <li class="animate-repeat" ng-repeat="friend in friends | filter:q as results">
      [{{$index + 1}}] {{friend.name}} who is {{friend.age}} years old.
    </li>
    <li class="animate-repeat" ng-if="results.length === 0">
      <strong>No results found...</strong>
    </li>
  </ul>
</div>
angular.module('ngRepeat', ['ngAnimate']).controller('repeatController', function($scope) {
  $scope.friends = [
    {name:'John', age:25, gender:'boy'},
    {name:'Jessie', age:30, gender:'girl'},
    {name:'Johanna', age:28, gender:'girl'},
    {name:'Joy', age:15, gender:'girl'},
    {name:'Mary', age:28, gender:'girl'},
    {name:'Peter', age:95, gender:'boy'},
    {name:'Sebastian', age:50, gender:'boy'},
    {name:'Erika', age:27, gender:'girl'},
    {name:'Patrick', age:40, gender:'boy'},
    {name:'Samantha', age:60, gender:'girl'}
  ];
});
.example-animate-container {
  background:white;
  border:1px solid black;
  list-style:none;
  margin:0;
  padding:0 10px;
}

.animate-repeat {
  line-height:30px;
  list-style:none;
  box-sizing:border-box;
}

.animate-repeat.ng-move,
.animate-repeat.ng-enter,
.animate-repeat.ng-leave {
  transition:all linear 0.5s;
}

.animate-repeat.ng-leave.ng-leave-active,
.animate-repeat.ng-move,
.animate-repeat.ng-enter {
  opacity:0;
  max-height:0;
}

.animate-repeat.ng-leave,
.animate-repeat.ng-move.ng-move-active,
.animate-repeat.ng-enter.ng-enter-active {
  opacity:1;
  max-height:30px;
}
var friends = element.all(by.repeater('friend in friends'));

it('should render initial data set', function() {
  expect(friends.count()).toBe(10);
  expect(friends.get(0).getText()).toEqual('[1] John who is 25 years old.');
  expect(friends.get(1).getText()).toEqual('[2] Jessie who is 30 years old.');
  expect(friends.last().getText()).toEqual('[10] Samantha who is 60 years old.');
  expect(element(by.binding('friends.length')).getText())
      .toMatch("I have 10 friends. They are:");
});

 it('should update repeater when filter predicate changes', function() {
   expect(friends.count()).toBe(10);

   element(by.model('q')).sendKeys('ma');

   expect(friends.count()).toBe(2);
   expect(friends.get(0).getText()).toEqual('[1] Mary who is 28 years old.');
   expect(friends.last().getText()).toEqual('[2] Samantha who is 60 years old.');
 });