ng-model 指令用于绑定应用程序数据到 HTML 控制器(input, select, textarea)的值。
ng-model 指令
ng-model 指令可以将输入域的值与 AngularJS 创建的变量绑定。
AngularJS 实例
<div ng-app="myApp" ng-controller="myCtrl">
名字: <input ng-model="name">
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.name = "John Doe";
});
</script>
名字: <input ng-model="name">
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.name = "John Doe";
});
</script>
双向绑定
双向绑定，在修改输入域的值时， AngularJS 属性的值也将修改：
AngularJS 实例
<div ng-app="myApp" ng-controller="myCtrl">
名字: <input ng-model="name">
<h1>你输入了: {{name}}</h1>
</div>
名字: <input ng-model="name">
<h1>你输入了: {{name}}</h1>
</div>
验证用户输入
AngularJS 实例
<form ng-app="" name="myForm">
Email:
<input type="email" name="myAddress" ng-model="text">
<span ng-show="myForm.myAddress.$error.email">不是一个合法的邮箱地址</span>
</form>
Email:
<input type="email" name="myAddress" ng-model="text">
<span ng-show="myForm.myAddress.$error.email">不是一个合法的邮箱地址</span>
</form>
以上实例中，提示信息会在 ng-show 属性返回 true 的情况下显示。
应用状态
ng-model 指令可以为应用数据提供状态值(invalid,
dirty, touched, error):
AngularJS 实例
<form ng-app="" name="myForm" ng-init="myText = 'test@json.cn'">
Email:
<input type="email" name="myAddress" ng-model="myText" required></p>
<h1>状态</h1>
{{myForm.myAddress.$valid}}
{{myForm.myAddress.$dirty}}
{{myForm.myAddress.$touched}}
</form>
Email:
<input type="email" name="myAddress" ng-model="myText" required></p>
<h1>状态</h1>
{{myForm.myAddress.$valid}}
{{myForm.myAddress.$dirty}}
{{myForm.myAddress.$touched}}
</form>
CSS 类
ng-model 指令基于它们的状态为 HTML 元素提供了 CSS 类：
AngularJS 实例
<style>
input.ng-invalid {
background-color: lightblue;
}
background-color: lightblue;
}
</style>
<body>
<form ng-app="" name="myForm">
输入你的名字:
<input name="myAddress" ng-model="text" required>
</form>
<body>
<form ng-app="" name="myForm">
输入你的名字:
<input name="myAddress" ng-model="text" required>
</form>
ng-model 指令根据表单域的状态添加/移除以下类：
- ng-empty
- ng-not-empty
- ng-touched
- ng-untouched
- ng-valid
- ng-invalid
- ng-dirty
- ng-pending
- ng-pristine
