使用AngularJS建立自訂的過濾器的方法

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使用AngularJS建立自訂的過濾器的方法

   這篇文章主要介紹了使用AngularJS建立自訂的過濾器的方法,AngularJS是非常熱門的JavaScript庫,需要的朋友可以參考下

  Angularjs過濾器是 angularjs非常棒的特性之一。有朝一日,你可能需要使用自訂過濾器,幸運的是,你找到了這篇博文。

  下面顯示的是自訂過濾器長什麼樣子(請注意myfilter):

  我們的自訂過濾器叫做 "myfilter", 它有由 ':'隔開的4個參數.

  這是一個將會用到的樣本輸入:

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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'}];

  過濾器只顯示電話號碼中含有 "555"的項,這是樣本輸出:

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Name Phone

John 555-1276

Mike 555-4321

Adam 555-5678

David 555-8765

Mikay 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):

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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;

};

});

  上面的代碼大多都log了(譯者註:將資訊顯示到控制台). 實際完成過濾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;

  "return window[args[4]](input)" 調用第四個參數, 它是 'windowScopedFilter'.

  這是控制台輸出:

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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

  完整代碼:

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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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