AngularJS学习篇（十）
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:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="angular-1.6.3/angular.js"></script>
</head>
<body>
<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) {
$scope.names=['google','baidu','tengxun'];
})
</script>
</body>
</html>
ng-init 初始值，ng-options="x for x in names"读取数组
使用 ng-repeat 创建选择框
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="angular-1.6.3/angular.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<select>
<option ng-repeat="x in names">{{x}}</option>
</select>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',function ($scope) {
$scope.names=['google','baidu','tengxun'];
})
</script>
</body>
</html>
ng-repeat 指令是通过数组来循环 HTML 代码来创建下拉列表，但 ng-options 指令更适合创建下拉列表，它有以下优势：
使用 ng-options 的选项是一个对象， ng-repeat 是一个字符串。当选择值是一个对象时，我们就可以获取更多信息，应用也更灵活。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="angular-1.6.3/angular.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<select ng-model="selectedSite">
<option ng-repeat="x in names" value="{{x.url}}">{{x.site}}</option>
</select>
<h1>你选择的是: {{selectedSite}}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',function ($scope) {
$scope.names=[ {site : "Google", url : "http://www.google.com"},
{site : "Runoob", url : "http://www.runoob.com"},
{site : "Taobao", url : "http://www.taobao.com"}];
})
</script>
</body>
</html>
你选择的是: http://www.runoob.com---->字符串
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="angular-1.6.3/angular.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<select ng-model="selectedSite" ng-options="x.site for x in names">
</select>
<h1>你选择的是: {{selectedSite}}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',function ($scope) {
$scope.names=[ {site : "Google", url : "http://www.google.com"},
{site : "Runoob", url : "http://www.runoob.com"},
{site : "Taobao", url : "http://www.taobao.com"}];
})
</script>
</body>
</html>
你选择的是: {"site":"Google","url":"http://www.google.com"}---->对象
数据源为对象
使用对象作为数据源, x 为键(key), y 为值(value):
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="angular-1.6.3/angular.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<select ng-model="selectedSite" ng-options="x for (x,y) in names">
</select>
<h1>你选择的是: {{selectedSite}}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',function ($scope) {
$scope.names= {site1 : "Google", site2 : "http://www.google.com"};
})
</script>
</body>
</html>
你选择的是: Google
你选择的值为在 key-value 对中的 value。
value 在 key-value 对中也可以是个对象：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="angular-1.6.3/angular.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<select ng-model="selectedSite" ng-options="x for (x,y) in names">
</select>
<h1>你选择的是: {{selectedSite}}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',function ($scope) {
$scope.names= {car01 : {brand : "Ford", model : "Mustang", color : "red"},
car02 : {brand : "Fiat", model : "500", color : "white"},
car03 : {brand : "Volvo", model : "XC90", color : "black"}};
})
</script>
</body>
</html>
你选择的是: {"brand":"Ford","model":"Mustang","color":"red"}
在下拉菜单也可以不使用 key-value 对中的 key , 直接使用对象的属性，但是选项还是value：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="angular-1.6.3/angular.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<select ng-model="selectedSite" ng-options="y.brand for (x,y) in names">
</select>
<h1>你选择的是: {{selectedSite}}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',function ($scope) {
$scope.names= {car01 : {brand : "Ford", model : "Mustang", color : "red"},
car02 : {brand : "Fiat", model : "500", color : "white"},
car03 : {brand : "Volvo", model : "XC90", color : "black"}};
})
</script>
</body>
</html>
你选择的是: {"brand":"Ford","model":"Mustang","color":"red"}
