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How to create custom filters using AngularJS_AngularJS

WBOYOriginal: 2016-05-16 15:54:121177browse

Angularjs filters are one of the great features of angularjs. One day you may need to use custom filters and luckily you found this blog post.

Shown below is what a custom filter looks like (note myfilter):

Our custom filter is called "myfilter", which has 4 parameters separated by ':'.

This is a sample input that will be used:

  $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'}];

The filter only shows items with "555" in the phone number, here is the sample output:

 Name   Phone 
 John   555-1276 
 Mike   555-4321 
 Adam   555-5678 
 David   555-8765 
 Mikay   555-5678

The processing flow of filtering "555" is executed by "windowScopedFilter", which is the fourth parameter of filter 'myfilter'.

Let’s implement these functions (add logging to each input parameter):

 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; 
  }; 
 });

Most of the above code is logged (Translator's Note: Display information to the console). The most important part of actually completing the filtering is:

   // filter 
   if (5<=args.length) { 
      return window[args[4]](input); 
   } 
   return input;

"return window[args[4]](input)" calls the fourth parameter, which is 'windowScopedFilter'.

This is the console output:

 
 "------------------------------------------------- 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

Full code:

<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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