Angularjs過濾器是 angularjs非常棒的特性之一。有朝一日，你可能需要使用自定義過濾器，幸運的是，你找到了這篇博文。
下面顯示的是自定義過濾器長什麼樣子(請注意myfilter):
<tr ng-repeat="friend in friends |myfilter:'param1':'param2':true:'windowScopedFilter'">
我們的自定義過濾器叫做 "myfilter", 它有由 ':'隔開的4個參數.
這是一個將會用到的樣本輸入:
$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'}];
過濾"555"的處理流程由 "windowScopedFilter"執行, 它是過濾器 'myfilter'的第四個參數.
下面我們來實現這些功能 (把logging添加到每個輸入參數):
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;
};
});
上面的代碼大多都log了(譯者注：將信息顯示到控制台). 實際完成過濾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)" 調用第四個參數, 它是 'windowScopedFilter'.
這是控制台輸出:
"------------------------------------------------- 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
完整代碼:
<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>
帶你走近AngularJS系列：
如何在 AngularJS 中對控制器進行單元測試 http://www.linuxidc.com/Linux/2013-12/94166.htm
在 AngularJS 應用中通過 JSON 文件來設置狀態 http://www.linuxidc.com/Linux/2014-07/104083.htm
AngularJS 之 Factory vs Service vs Provider http://www.linuxidc.com/Linux/2014-05/101475.htm
AngularJS —— 使用 ngResource、RESTful APIs 和 Spring MVC 框架提交數據 http://www.linuxidc.com/Linux/2014-07/104402.htm
AngularJS 的詳細介紹：請點這裡
AngularJS 的下載地址：請點這裡
