AngularJS Select


AngularJS can create a drop-down list of options using an array or object.

Use ng-options to create a selection box

In AngularJS we can use the ng-option directive to create a drop-down list, and the list items pass objects and arrays Loop output, as follows:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>

<div ng-app="myApp" ng-controller="myCtrl">

<select 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>

</body>
</html>

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ng-options and ng-repeat

We can also use the ng-repeat directive to create a drop-down list:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.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", "php.cn", "Taobao"];
});
</script>

<p>该实例演示了使用 ng-repeat 指令来创建下拉列表。</p>

</body>
</html>

Run Instance»

Click the "Run Instance" button to view the online instance

The

ng-repeat directive loops the HTML code through an array to create a drop-down list, but the ng-options directive is more suitable for creating a drop-down list, it has Following advantages:

Use ng-options an object of options, ng-repeat is a string.

Which one should be better to use?

Suppose we use the following object:

$scope.sites = [
    {site : "Google", url : "http://www.google.com"},
    {site : "php", url : "http://www.php.cn"},
    {site : "Taobao", url : "http://www.taobao.com"}
];

ng-repeat There are limitations, the selected values Is a string:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>

<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>

<p>该实例演示了使用 ng-repeat 指令来创建下拉列表，选中的值是一个字符串。</p>
</body>
</html>

Run Instance»

Click the "Run Instance" button to view Online example

Use the ng-options directive, and the selected value is an object:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>

<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>

<p>该实例演示了使用 ng-options  指令来创建下拉列表，选中的值是一个对象。</p>
</body>
</html>

Run instance»

Click the "Run instance" button to view the online instance

When the selected value is an object, We can obtain more information and the application will be more flexible.

The data source is an object

We used an array as the data source in the previous example, and below we use the data object as the data source. 

$scope.sites = {
    site01 : "Google",
    site02 : "php",
    site03 : "Taobao"
};

ng-options Using objects makes a big difference, as follows:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>

<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>

</body>
</html>

Run Instance»

Click the "Run Instance" button to view the online instance

The value you select is the value in the key-value pair.

value can also be an object in the key-value pair:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>

<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>

</body>
</html>

Run Instance»

Click the "Run Instance" button to view the online instance

You can also use the key in the drop-down menu key in the -value pair, directly use the object's attributes:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>

<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>

</body>
</html>

RunInstance»

Click the "Run Instance" button to view the online instance