AngularJS 模型
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2023-03-14
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.$error.email" >不是一个合法的邮箱地址 < /span >
< /form >
以上实例中,提示信息会在 ng-show
属性返回 true
的情况下显示。
应用状态
ng-model
指令可以为应用数据提供状态值(invalid, dirty, touched, error):
AngularJS 实例
<form ng-app="" name="myForm" ng-init="myText = 'test@xnip.cn'">
Email:
<input type="email" name="myAddress" ng-model="myText" required>
<p>编辑邮箱地址,查看状态的改变。</p>
<h1>状态</h1>
<p>Valid: {{myForm.myAddress.$valid}} (如果输入的值是合法的则为 true)。</p>
<p>Dirty: {{myForm.myAddress.$dirty}} (如果值改变则为 true)。</p>
<p>Touched: {{myForm.myAddress.$touched}} (如果通过触屏点击则为 true)。</p>
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