使用AngularJS创建自定义的过滤器的方法

使用AngularJS创建自定义的过滤器的方法_AngularJS

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发布： 2016-05-16 15:54:12

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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):

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'}];

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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

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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; 
 }; 
});

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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;

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"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

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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>

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