系统的学习了一下angularjs,发现angularjs的有些思想根php的模块smarty很像,例如数据绑定,filter。如果对smarty比较熟悉的话,学习angularjs会比较容易一点,这篇文章给大家介绍angularjs filter用法详解,感兴趣的朋友一起学习吧
Filter简介
Filter是用来格式化数据用的。
Filter的基本原型( ‘|' 类似于Linux中的管道模式):
Filter可以被链式使用(即连续使用多个filter):
Filter也可以指定多个参数:
AngularJS内建的Filter
AngularJS内建了一些常用的Filter,我们一一来看一下。
currencyFilter(currency):
用途:格式化货币
方法原型:
用法:
{{ | currency}}
{{ . | currency:'¥'}}
{{ . | currency:'CHY¥':}}
{{ . | currency:undefined:0}}
dateFilter(date):
用途:格式化日期
方法原型:
用法:
{{ '2015-05-20T03:56:16.887Z' | date:"MM/dd/yyyy @ h:mma"}}
{{ 1432075948123 | date:"MM/dd/yyyy @ h:mma"}}
{{ 1432075948123 | date:"MM/dd/yyyy @ h:mma":"UTC"}}
filterFilter(filter):
用途:过滤数组
方法原型:
用法1(参数expression使用String):
<div ng-init="myArr = [{name:'Tom', age:}, {name:'Tom Senior', age:}, {name:'May', age:}, {name:'Jack', age:}, {name:'Alice', age:}]"> <!-- 参数expression使用String,将全文搜索关键字 'a' --> <div ng-repeat="u in myArr | filter:'a' "> <p>Name:{{u.name}}</p> <p>Age:{{u.age}}</p> <br /> </div> </div>
用法2(参数expression使用function):
// 先在Controller中定义function: myFilter $scope.myFilter = function (item) { return item.age === ; }; <div ng-repeat="u in myArr | filter:myFilter "> <p>Name:{{u.name}}</p> <p>Age:{{u.age}}</p> <br /> </div>
用法3(参数expression使用object):
<div ng-init="myArr = [{name:'Tom', age:}, {name:'Tom Senior', age:}, {name:'May', age:}, {name:'Jack', age:}, {name:'Alice', age:}]"> <div ng-repeat="u in myArr | filter:{age: } "> <p>Name:{{u.name}}</p> <p>Age:{{u.age}}</p> <br /> </div> </div>
用法4(指定comparator为true或false):
<div ng-init="myArr = [{name:'Tom', age:}, {name:'Tom Senior', age:}, {name:'May', age:}, {name:'Jack', age:}, {name:'Alice', age:}]"> Name:<input ng-model="yourName" /> <!-- 指定comparator为false或者undefined,即为默认值可不传,将以大小写不敏感的方式匹配任意内容 --> <!-- 可以试试把下面代码的comparator为true,true即大小写及内容均需完全匹配 --> <div ng-repeat="u in myArr | filter:{name:yourName}:false "> <p>Name:{{u.name}}</p> <p>Age:{{u.age}}</p> <br /> </div> </div>
用法5(指定comparator为function):
// 先在Controller中定义function:myComparator, 此function将能匹配大小写不敏感的内容,但与comparator为false的情况不同的是,comparator必须匹配全文 $scope.myComparator = function (expected, actual) { return angular.equals(expected.toLowerCase(), actual.toLowerCase()); } <div ng-init="myArr = [{name:'Tom', age:}, {name:'Tom Senior', age:}, {name:'May', age:}, {name:'Jack', age:}, {name:'Alice', age:}]"> Name:<input ng-model="yourName" /> <div ng-repeat="u in myArr | filter:{name:yourName}:myComparator "> <p>Name:{{u.name}}</p> <p>Age:{{u.age}}</p> <br /> </div> </div>
jsonFilter(json):
方法原型:
用法(将对象格式化成标准的JSON格式):
limitToFilter(limitTo):
方法原型:
用法(选取前N个记录):
<div ng-init="myArr = [{name:'Tom', age:}, {name:'Tom Senior', age:}, {name:'May', age:}, {name:'Jack', age:}, {name:'Alice', age:}]"> <div ng-repeat="u in myArr | limitTo:"> <p>Name:{{u.name}} <p>Age:{{u.age}} </div> </div>
lowercaseFilter(lowercase)/uppercaseFilter(uppercase):
方法原型:
用法:
China has joined the {{ "wto" | uppercase }}. We all need {{ "MONEY" | lowercase }}.
numberFilter(number):
方法原型:
用法:
{{ "3456789" | number}} <br /> {{ true | number}} <br /> {{ 12345678 | number:1}}
orderByFilter(orderBy):
方法原型:
用法:
<div ng-init="myArr = [{name:'Tom', age:, deposit: }, {name:'Tom', age:, deposit: }, {name:'Tom Senior', age:, deposit: }, {name:'May', age:, deposit: }, {name:'Jack', age:, deposit:}, {name:'Alice', age:, deposit: }]"> <!--deposit前面的'-'表示deposit这列倒叙排序,默认为顺序排序 参数reverseOrder:true表示结果集倒叙显示--> <div ng-repeat="u in myArr | orderBy:['name','-deposit']:true"> <p>Name:{{u.name}}</p> <p>Deposit:{{u.deposit}}</p> <p>Age:{{u.age}}</p> <br /> </div> </div>
自定义Filter
和Directive一样,如果内建的Filter不能满足你的需求,你当然可以定义一个专属于你自己的Filter。我们来做一个自己的Filter:capitalize_as_you_want,该Filter会使你输入的字符串中的首字母、指定index位置字母以及指定的字母全部大写。
方法原型:
完整的示例代码:
<!DOCTYPE> <html> <head> <script src="/Scripts/angular.js"></script> <script type="text/javascript"> (function () { var app = angular.module('ngCustomFilterTest', []); app.filter('capitalize_as_you_want', function () { return function (input, capitalize_index, specified_char) { input = input || ''; var output = ''; var customCapIndex = capitalize_index || -; var specifiedChar = specified_char || ''; for (var i = ; i < input.length; i++) { // 首字母肯定是大写的, 指定的index的字母也大写 if (i === || i === customCapIndex) { output += input[i].toUpperCase(); } else { // 指定的字母也大写 if (specified_char != '' && input[i] === specified_char) { output += input[i].toUpperCase(); } else { output += input[i]; } } } return output; }; }); })(); </script> </head> <body ng-app="ngCustomFilterTest"> <input ng-model="yourinput" type="text"> <br /> Result: {{ yourinput | capitalize_as_you_want::'b' }} </body> </html>
好了,本篇讲了AngularJS中的Filter,看完这篇后,我们可以利用好Filter非常方便的使数据能按我们的要求进行展示,从而使页面变得更生动。