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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:


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$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:

 

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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):
 

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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:
 

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// 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:

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"------------------------------------------------- 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:
 
 

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<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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