AngularJS 过滤器
过滤器可以使用一个管道字符（|）添加到表达式和指令中。
| 过滤器 | 描述 |
|---|---|
| currency | 格式化数字为货币格式。 |
| filter | 从数组项选择一个子集 |
| lowercase | 格式化字符串为小写 |
| orderBy | 根据某个表达式排列数组 |
| uppercase | 格式化字符串为大写 |
表达式中添加过滤器
过滤器可以通过一个管道字符（|）和一个过滤器添加到表达式中。. (下面的两个实例，我们将使用前面章节中提到的 person 控制器)
- uppercase 过滤器将字符串格式化为大写：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://cdn.bootcss.com/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="personCtrl">
<p>姓名为 {{ lastName | uppercase }}</p>
</div>
<script src="http://www.runoob.com/try/demo_source/personController.js"></script>
</body>
</html>
currency 过滤器
currency 过滤器将数字格式化为货币格式：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="costCtrl">
数量: <input type="number" ng-model="quantity">
价格: <input type="number" ng-model="price">
<p>总价 = {{ (quantity * price) | currency }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('costCtrl', function($scope) {
$scope.quantity = 1;
$scope.price = 9.99;
});
</script>
</body>
</html>
向指令添加过滤器
过滤器可以通过一个管道字符（|）和一个过滤器添加到指令中。 orderBy 过滤器根据表达式排列数组：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="namesCtrl">
<p>循环对象:</p>
<ul>
<li ng-repeat="x in names | orderBy:'country'">
{{ x.name + ', ' + x.country }}
</li>
</ul>
</div>
<script src="//www.runoob.com/try/demo_source/namesController.js"></script>
</body>
</html>
- www.runoob.com/try/demo_source/namesController.js
angular.module('myApp', []).controller('namesCtrl', function($scope) {
$scope.names = [
{name:'Jani',country:'Norway'},
{name:'Hege',country:'Sweden'},
{name:'Kai',country:'Denmark'}
];
});
过滤输入
输入过滤器可以通过一个管道字符（|）和一个过滤器添加到指令中，该过滤器后跟一个冒号和一个模型名称。
filter 过滤器从数组中选择一个子集：
<head>
<meta charset="utf-8">
<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="namesCtrl">
<p>输入过滤:</p>
<p><input type="text" ng-model="test"></p>
<ul>
<li ng-repeat="x in names | filter:test | orderBy:'country'">
{{ (x.name | uppercase) + ', ' + x.country }}
</li>
</ul>
</div>
<script src="http://www.runoob.com/try/demo_source/namesController.js"></script>
</body>
</html>
- http://www.runoob.com/try/demo_source/namesController.js
angular.module('myApp', []).controller('namesCtrl', function($scope) {
$scope.names = [
{name:'Jani',country:'Norway'},
{name:'Hege',country:'Sweden'},
{name:'Kai',country:'Denmark'}
];
});
自定义过滤器
以下实例自定义一个过滤器 reverse，将字符串反转：
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
姓名: {{ msg | reverse }}
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.msg = "Runoob";
});
app.filter('reverse', function() { //可以注入依赖
return function(text) {
return text.split("").reverse().join("");
}
});
</script>
</body>
</html>