AngularJS Select(选择框)
AngularJS Select(选择框)
使用 ng-options 创建选择框
在 AngularJS 中我们可以使用 ng-option 指令来创建一个下拉列表，列表项通过对象和数组循环输出，如下实例:
<div ng-app="myApp" ng-controller="myCtrl">
<select ng-init="selectedName = names[0]" ng-model="selectedName" ng-options="x for x in names">
</select>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.names = ["Google", "Runoob", "Taobao"];
});
</script>
<p>该实例演示了 ng-options 指令的使用。</p>
ng-options 与 ng-repeat
我们也可以使用ng-repeat 指令来创建下拉列表：
<select><option ng-repeat="x in names">{{x}}</option></select>
ng-repeat 指令是通过数组来循环 HTML 代码来创建下拉列表，但 ng-options 指令更适合创建下拉列表，它有以下优势：使用 ng-options 的选项的一个对象， ng-repeat 是一个字符串。
应该用哪个更好?
<div ng-app="myApp" ng-controller="myCtrl"><p>选择网站:</p><select ng-model="selectedSite"><option ng-repeat="x in sites" value="{{x.url}}">{{x.site}}</option></select><h1>你选择的是: {{selectedSite}}</h1></div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.sites = [
{site : "Google", url : "http://www.google.com"},
{site : "Runoob", url : "http://www.runoob.com"},
{site : "Taobao", url : "http://www.taobao.com"}
];
});
</script>
<div ng-app="myApp" ng-controller="myCtrl"><p>选择网站:</p><select ng-model="selectedSite" ng-options="x.site for x in sites"></select><h1>你选择的是: {{selectedSite.site}}</h1><p>网址为: {{selectedSite.url}}</p></div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.sites = [
{site : "Google", url : "http://www.google.com"},
{site : "Runoob", url : "http://www.runoob.com"},
{site : "Taobao", url : "http://www.taobao.com"}
];
});
</script>
数据源为对象
使用对象作为数据源, x 为键(key), y 为值(value):
<div ng-app="myApp" ng-controller="myCtrl">
<p>选择的网站是:</p>
<select ng-model="selectedSite" ng-options="x for (x, y) in sites">
</select>
<h1>你选择的值是: {{selectedSite}}</h1>
</div>
<p>该实例演示了使用对象作为创建下拉列表。</p>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.sites = {
site01 : "Google",
site02 : "Runoob",
site03 : "Taobao"
};
});
</script>
选择的值在 key-value 对的 value 中, 这是它是一个对象:
<div ng-app="myApp" ng-controller="myCtrl">
<p>选择一辆车:</p>
<select ng-model="selectedCar" ng-options="x for (x, y) in cars">
</select>
<h1>你选择的是: {{selectedCar.brand}}</h1>
<h2>模型: {{selectedCar.model}}</h2>
<h3>颜色: {{selectedCar.color}}</h3>
<p>注意选中的值是一个对象。</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.cars = {
car01 : {brand : "Ford", model : "Mustang", color : "red"},
car02 : {brand : "Fiat", model : "500", color : "white"},
car03 : {brand : "Volvo", model : "XC90", color : "black"}
}
});
</script>
在下拉菜单也可以不使用 key-value 对中的 key , 直接使用对象的属性：
<div ng-app="myApp" ng-controller="myCtrl">
<p>选择一辆车:</p>
<select ng-model="selectedCar" ng-options="y.brand for (x, y) in cars"></select>
<p>你选择的是: {{selectedCar.brand}}</p>
<p>型号为: {{selectedCar.model}}</p>
<p>颜色为: {{selectedCar.color}}</p>
<p>下拉列表中的选项也可以是对象的属性。</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.cars = {
car01 : {brand : "Ford", model : "Mustang", color : "red"},
car02 : {brand : "Fiat", model : "500", color : "white"},
car03 : {brand : "Volvo", model : "XC90", color : "black"}
}
});
</script>
