Angularjs过滤器是 angularjs非常棒的特性之一。有朝一日,你可能需要使用自定义过滤器,幸运的是,你找到了这篇博文。下面显示的是自定义过滤器长什么样子(请注意myfilter):<tr ng-repeat="friend in friends |myfilter:"param1":"param2":true:"windowScopedFilter"">我们的自定义过滤器叫做 "
myfilter", 它有由 "
:"隔开的4个参数.
这是一个将会用到的样本输入:
$scope.friends = [{name:"John", phone:"555-1276"}, {name:"Annie", phone:"800-BIG-MARY"}, {name:"Mike", phone:"555-4321"}, {name:"Adam", phone:"555-5678"}, {name:"David", phone:"555-8765"}, {name:"Mikay", phone:"555-5678"}];过滤"
555"的处理流程由 "
windowScopedFilter"执行, 它是过滤器 "
myfilter"的第四个参数.下面我们来实现这些功能 (把logging添加到每个输入参数):
var myapp = angular.module("MyFilterApp", []); myapp.filter("myfilter", function() { return function(input, param1) { console.log("------------------------------------------------- begin dump of custom parameters"); console.log("input=",input); console.log("param1(string)=", param1); var args = Array.prototype.slice.call(arguments); console.log("arguments=", args.length); if (3<=args.length) { console.log("param2(string)=", args[2]); } if (4<=args.length) { console.log("param3(bool)=", args[3]); } console.log("------------------------------------------------- end dump of custom parameters"); if (5<=args.length) { return window[args[4]](input); } return input; }; });上面的代码大多都log了(译者注:将信息显示到控制台). 实际完成过滤的最重要的一部分是:
if (5<=args.length) { return window[args[4]](input); } return input;"return window[args[4]](input)" 调用第四个参数, 它是 "
windowScopedFilter".
这是控制台输出:
"------------------------------------------------- begin dump of custom parameters" custom_filter_function.html:21 "input=" [object Array] custom_filter_function.html:22 "param1(string)=" "param1" custom_filter_function.html:23 "arguments=" 5 custom_filter_function.html:25 "param2(string)=" "param2" custom_filter_function.html:27 "param3(bool)=" true custom_filter_function.html:30 "------------------------------------------------- end dump of custom parameters" custom_filter_function.html:32 "------------------------------------------------- begin dump of custom parameters" custom_filter_function.html:21 "input=" [object Array] custom_filter_function.html:22 "param1(string)=" "param1" custom_filter_function.html:23 "arguments=" 5 custom_filter_function.html:25 "param2(string)=" "param2" custom_filter_function.html:27 "param3(bool)=" true custom_filter_function.html:30 "------------------------------------------------- end dump of custom parameters" custom_filter_function.html:32完整代码:
<html> <head> <script src="angular.min.js"></script> <script type="text/javascript"> function windowScopedFilter (input) { var output = []; angular.forEach(input, function(v,k){ if (v.phone.contains("555")) { output.push(v); } }); return output; } var myapp = angular.module("MyFilterApp", []); myapp.filter("myfilter", function() { return function(input, param1) { console.log("------------------------------------------------- begin dump of custom parameters"); console.log("input=",input); console.log("param1(string)=", param1); var args = Array.prototype.slice.call(arguments); console.log("arguments=", args.length); if (3<=args.length) { console.log("param2(string)=", args[2]); } if (4<=args.length) { console.log("param3(bool)=", args[3]); } console.log("------------------------------------------------- end dump of custom parameters"); if (5<=args.length) { return window[args[4]](input); } return input; }; }); myapp.controller("MyFilterController", ["$scope", function($scope) { $scope.friends = [{name:"John", phone:"555-1276"}, {name:"Annie", phone:"800-BIG-MARY"}, {name:"Mike", phone:"555-4321"}, {name:"Adam", phone:"555-5678"}, {name:"David", phone:"555-8765"}, {name:"Mikay", phone:"555-5678"}]; }]); </script> </head> <body ng-app="MyFilterApp"> <div ng-controller="MyFilterController"> <table id="searchTextResults"> <tr><th>Name</th><th>Phone</th></tr> <tr ng-repeat="friend in friends |myfilter:"param1":"param2":true:"windowScopedFilter""> <td>{{friend.name}}</td> <td>{{friend.phone}}</td> </tr> </table> </div> <hr> </body> </html>带你走近AngularJS系列:
- 带你走近AngularJS - 基本功能介绍 http://www.linuxidc.com/Linux/2014-05/102140.htm
- 带你走近AngularJS - 体验指令实例 http://www.linuxidc.com/Linux/2014-05/102141.htm
- 带你走近AngularJS - 创建自定义指令 http://www.linuxidc.com/Linux/2014-05/102142.htm
如何在 AngularJS 中对控制器进行单元测试 http://www.linuxidc.com/Linux/2013-12/94166.htm在 AngularJS 应用中通过 JSON 文件来设置状态 http://www.linuxidc.com/Linux/2014-07/104083.htmAngularJS 之 Factory vs Service vs Provider http://www.linuxidc.com/Linux/2014-05/101475.htmAngularJS —— 使用 ngResource、RESTful APIs 和 Spring MVC 框架提交数据 http://www.linuxidc.com/Linux/2014-07/104402.htm
AngularJS 的详细介绍:请点这里
AngularJS 的下载地址:请点这里
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