创建 AngularJS 自定义过滤器，带自定义参数

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'}];

过滤器只显示电话号码中含有 "555"的项，这是样本输出:

Name     Phone  
 John      555-1276  
 Mike      555-4321  
 Adam      555-5678  
 David      555-8765  
 Mikay      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");  
      // filter  
      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:

 // filter  
      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'.

 "------------------------------------------------- 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");  
      // filter  
      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>

 

posted @ 2015-07-20 17:17  leejersey  阅读(8318)  评论(0)  编辑  收藏  举报