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AngularJS: API: ng/filter/limitTo

limitTo

  1. - filter in module ng

创建只包含指定数量元素的新数组或字符串。元素可从源数组或字符串的起点或终点开始取，通过limit来指定值和符号(正或负)。

用法

用于HTML模板绑定

{{ limitTo_expression | limitTo : limit}}

用于JavaScript

$filter('limitTo')(input, limit)

参数

参数 类型 详述
input Arraystring

用于限定的源数组或字符串。
limit stringnumber

返回的数组或字符串的长度。如果limit数字为正数，从源数组/字符串开始的limit数量的条目会被复制。如果数字为负数，从源数组/字符串结尾的limit 数量的条目会被复制。如果limit超过array.length会被裁剪。

返回值

Arraystring

长度为limit的新子数组或子串，如果输入数组小于limit，返回长度会小于limit。

示例

index.html
<script>
  angular.module('limitToExample', [])
    .controller('ExampleController', ['$scope', Function($scope) {
      $scope.numbers = [1,2,3,4,5,6,7,8,9];
      $scope.letters = "abcdefghi";
      $scope.numLimit = 3;
      $scope.letterLimit = 3;
    }]);
</script>
<div ng-controller="ExampleController">
  Limit {{numbers}} to: <input Type="integer" ng-model="numLimit">
  <p>Output numbers: {{ numbers | limitTo:numLimit }}</p>
  Limit {{letters}} to: <input Type="integer" ng-model="letterLimit">
  <p>Output letters: {{ letters | limitTo:letterLimit }}</p>
</div>
protractor.js
var numLimitInput = element(by.model('numLimit'));
var letterLimitInput = element(by.model('letterLimit'));
var limitedNumbers = element(by.binding('numbers | limitTo:numLimit'));
var limitedLetters = element(by.binding('letters | limitTo:letterLimit'));

it('should limit the number array to first three items', Function() {
  expect(numLimitInput.getAttribute('value')).toBe('3');
  expect(letterLimitInput.getAttribute('value')).toBe('3');
  expect(limitedNumbers.getText()).toEqual('Output numbers: [1,2,3]');
  expect(limitedLetters.getText()).toEqual('Output letters: abc');});

it('should update the output when -3 is entered', Function() {
  numLimitInput.clear();
  numLimitInput.sendKeys('-3');
  letterLimitInput.clear();
  letterLimitInput.sendKeys('-3');
  expect(limitedNumbers.getText()).toEqual('Output numbers: [7,8,9]');
  expect(limitedLetters.getText()).toEqual('Output letters: ghi');});

it('should not exceed the maximum size of input array', Function() {
  numLimitInput.clear();
  numLimitInput.sendKeys('100');
  letterLimitInput.clear();
  letterLimitInput.sendKeys('100');
  expect(limitedNumbers.getText()).toEqual('Output numbers: [1,2,3,4,5,6,7,8,9]');
  expect(limitedLetters.getText()).toEqual('Output letters: abcdefghi');});
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