Angular 中过滤 select 列表中的 option
ng-options
是一个指令,可以更轻松地创建 HTML 下拉框,用于从一个数组中选择一个将被保存到模型中的项。它通过分析 ng-options
评估表达式并返回一个数组或对象,动态构造了选项元素列表。
此外,ng-options
指令还在 Angular 中创建了一个选择元素。它可以根据用户的输入过滤项目列表。
在 Angular 中过滤选择列表选项的步骤如下:
- 首先,在终端中运行以下命令创建 Angular 项目。
ng new angular_filter_select
-
创建一个将通过
ng-options
进行过滤的选择组件。
ng g c SelectFilter
-
最后,向组件添加一个选择器,并传递将用于过滤的表达式。表达式使用名为
ng-model
的属性传递,该属性应与正在过滤的变量名匹配。
使用以上步骤,以下是 ng-options
过滤的示例。
TypeScript 代码:
var app = angular.module('plunker', []);
app.controller('MainCtrl', function($scope) {
$scope.CountryName =[{"countryName":"England","isDisabled":false},
{"countryName":"Netherlands","isDisabled":false},
{"countryName":"USA","isDisabled":false},
{"countryName":"China","isDisabled":false},
{"countryName":"India","isDisabled":false}];
});
HTML 代码:
<html ng-app="plunker">
<head>
<script>document.write('<base href="' + document.location + '" />');</script>
<script data-require="angular.js@1.5.x" src="https://code.angularjs.org/1.5.8/angular.js" data-semver="1.5.8"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
<H2>
Example of Using Filter with ng-options
</H2>
<select
ng-options="country.countryName as country.countryName disable when country.isDisabled for country in CountryName |filter:{isDisabled:false}"
ng-model="myCountry">
<option value="">Select a Country</option>
</select>
</body>
</html>
单击此处查看上述代码的实时演示。
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