本文实例讲述了AngularJS学习笔记之表单验证功能。分享给大家供大家参考，具体如下：
一、执行基本的表单验证
<!DOCTYPE html>
<html ng-app='exampleApp'>
<head>
<meta charset="UTF-8">
<title>表单</title>
<script src="../../js/angular.min.js" type="text/javascript" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="../../css/bootstrap.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<link rel="stylesheet" type="text/css" href="../../css/bootstrap-theme.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<script type="text/javascript">
angular.module('exampleApp',[])
.controller('defaultCtrl',function($scope){
$scope.addUser=function(userDetails){
$scope.message=userDetails.name "(" userDetails.email ")(" userDetails.agreed ")"
}
$scope.message='Ready';
});
</script>
</head>
<body>
<div id="todoPanel" class="panel" ng-controller='defaultCtrl'>
<form name='myForm' novalidate ng-submit='addUser(newUser)'>
<div class="well">
<div class="form-group">
<label for="">Name:</label>
<input type="text" name='userName' class="form-control" required ng-model='newUser.name'/>
</div>
<div class="form-group">
<label for="">Email:</label>
<input type="email" name='userEmail' class="form-control" required ng-model='newUser.email'/>
</div>
<div class="checkbox">
<label for="">
<input type="checkbox" ng-model='newUser.agreed' required />
I agree to the terms and conditions
</label>
</div>
<button type="submit" class="btn btn-primary btn-block" ng-disabled='myForm.$invalid'>OK</button>
</div>
<div class="well">
message:{{message}}
<div>
valid:{{myForm.$valid}}
</div>
</div>
</form>
</div>
</body>
</html>
在上述例子中，该HTML文档被浏览器加载时的初始状态是：有三个input元素以及一个被禁用且无法单击的ok按钮，当在文本框中输入值并且勾选了复选框之后，按钮将变为可用，从而允许用户提交表单。
1、增加表单元素
（1）首先需要在form上设置一个name属性
（2）需要给表单增添novalidate属性，该属性用于告诉浏览器不要自己校验表单，从而允许AngularJS不受干扰的工作
（3）ng-submit指令为表单提交事件指定一个自定义的响应行为，将在用户提交表单时触发
2、使用校验属性
（1）为各个想要验证的元素添加name属性，这样可以访问到Angularjs所提供的各种特殊的变量
（2）设置type属性，这个属性指定了input元素将要接收的数据类型，这些类型告诉angularjs需要什么样的校验
（3）指定required属性，这个属性指定用户必须为待校验的表单提供一个输入值
（4）在本例中input元素都使用ng-model指令来设置隐式定义的newUser对象的一个属性
3、监控表单的有效性
AngularJS中用来替换标准表单元素的指令定义了一些特殊的变量，可以用来检查表单中各个元素或整个表单的有效性状态。
$pristine：如果用户没有与元素/表单产生交互，则返回true
$dirty：如果用户与元素/表单产生过交互，则返回true
$valid：当元素/表单内容的校验结果为有效时则返回true
$invalid：当元素/表单内容的校验结果为无效时则返回true
$error：提供校验错误的详情信息
二、提供表单校验反馈信息
在上面的例子中展示的效果是比较简单的，ok按钮将一直被禁用，直到所有的input元素可用，以阻止用户输入错误格式的或未填完的数据。在接下来我们将演示AngularJS为报告实时的校验信息
1、使用css提供校验反馈信息
ng-pristine：用户未曾交互过的元素被添加到这个类
ng-dirty：用户曾经交互过的元素被添加到这个类
ng-valid：校验结果为有效的元素在这个类中
ng-invalid：校验结果为无效的元素在这个类中
下面我们来看具体用法：
<!DOCTYPE html>
<html ng-app='exampleApp'>
<head>
<meta charset="UTF-8">
<title>表单</title>
<script src="../../js/angular.min.js" type="text/javascript" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="../../css/bootstrap.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<link rel="stylesheet" type="text/css" href="../../css/bootstrap-theme.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<script type="text/javascript">
angular.module('exampleApp',[])
.controller('defaultCtrl',function($scope){
$scope.addUser=function(userDetails){
$scope.message=userDetails.name "(" userDetails.email ")(" userDetails.agreed ")"
}
$scope.message='Ready';
});
</script>
<style type="text/css">
form .ng-invalid.ng-dirty{background-color: lightpink;}
form .ng-valid.ng-dirty{background-color: lightgreen;}
span.summary.ng-invalid{color: red;font-weight: bold;}
span.summary.ng-valid{color: green;}
</style>
</head>
<body>
<div id="todoPanel" class="panel" ng-controller='defaultCtrl'>
<form name='myForm' novalidate ng-submit='addUser(newUser)'>
<div class="well">
<div class="form-group">
<label for="">Name:</label>
<input type="text" name='userName' class="form-control" required ng-model='newUser.name'/>
</div>
<div class="form-group">
<label for="">Email:</label>
<input type="email" name='userEmail' class="form-control" required ng-model='newUser.email'/>
</div>
<div class="checkbox">
<label for="">
<input type="checkbox" ng-model='newUser.agreed' required />
I agree to the terms and conditions
</label>
</div>
<button type="submit" class="btn btn-primary btn-block" ng-disabled='myForm.$invalid'>OK</button>
</div>
<div class="well">
message:{{message}}
<div>
valid:
<span class="summary" ng-class="myForm.$valid?'ng-valid':'ng-invalid'">
{{myForm.$valid}}
</span>
</div>
</div>
</form>
</div>
</body>
</html>
在上述例子中，我们定义了四个样式，头两个样式用于选择属于ng-dirty类成员的元素，仅在用户与之交互后应用到相应元素上。内容有效的元素是ng-valid类的成员，会被渲染为淡绿色背景，内容无效的元素是ng-invalid类的成员，会被渲染为淡粉色背景
2、使用特殊变量来提供反馈信息
<!DOCTYPE html>
<html ng-app='exampleApp'>
<head>
<meta charset="UTF-8">
<title>表单</title>
<script src="../../js/angular.min.js" type="text/javascript" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="../../css/bootstrap.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<link rel="stylesheet" type="text/css" href="../../css/bootstrap-theme.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<script type="text/javascript">
angular.module('exampleApp',[])
.controller('defaultCtrl',function($scope){
$scope.addUser=function(userDetails){
$scope.message=userDetails.name "(" userDetails.email ")(" userDetails.agreed ")"
}
$scope.message='Ready';
});
</script>
<style type="text/css">
form .ng-invalid-required.ng-dirty{background-color: lightpink;}
form .ng-invalid-email.ng-dirty{background-color: lightgoldenrodyellow;}
form .ng-valid.ng-dirty{background-color: lightgreen;}
span.summary.ng-invalid{color: red;font-weight: bold;}
span.summary.ng-valid{color: green;}
div.error{color:red;font-weight: bold;}
</style>
</head>
<body>
<div id="todoPanel" class="panel" ng-controller='defaultCtrl'>
<form name='myForm' novalidate ng-submit='addUser(newUser)'>
<div class="well">
<div class="form-group">
<label for="">Email:</label>
<input type="email" name='userEmail' class="form-control" required ng-model='newUser.email'/>
<div class="error" ng-show="myForm.userEmail.$invalid&&myForm.userEmail.$dirty">
<span ng-show="myForm.userEmail.$error.email">
please enter a valid email address
</span>
<span ng-show="myForm.userEmail.$error.required">
please enter a value
</span>
</div>
</div>
<button type="submit" class="btn btn-primary btn-block" ng-disabled='myForm.$invalid'>OK</button>
</div>
</form>
</div>
</body>
</html>
在本例中新增了一个新的div元素用于给用户显示校验提示信息，新的div元素的可见性是受ng-show指令控制的，将会在input元素被输入值，且输入值未通过校验时显示该元素。这里是联合使用form元素的name值和input的name值来访问input元素的。在这个例子中，我们使用特殊校验变量和其他指令联合使用以增强用户体验。但是这样可能会使页面增加大量的相同冗余信息的元素，接下来我们做简化
<!DOCTYPE html>
<html ng-app='exampleApp'>
<head>
<meta charset="UTF-8">
<title>表单</title>
<script src="../../js/angular.min.js" type="text/javascript" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="../../css/bootstrap.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<link rel="stylesheet" type="text/css" href="../../css/bootstrap-theme.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
<script type="text/javascript">
angular.module('exampleApp',[])
.controller('defaultCtrl',function($scope){
$scope.addUser=function(userDetails){
$scope.message=userDetails.name "(" userDetails.email ")(" userDetails.agreed ")"
}
$scope.message='Ready';
$scope.getError=function(error){
if(angular.isDefined(error)){
if(error.required){
return 'please enter a value';
}else if(error.email){
return 'please enter a valid email address';
}
}
}
});
</script>
<style type="text/css">
form .ng-invalid-required.ng-dirty{background-color: lightpink;}
form .ng-invalid-email.ng-dirty{background-color: lightgoldenrodyellow;}
form .ng-valid.ng-dirty{background-color: lightgreen;}
span.summary.ng-invalid{color: red;font-weight: bold;}
span.summary.ng-valid{color: green;}
div.error{color:red;font-weight: bold;}
</style>
</head>
<body>
<div id="todoPanel" class="panel" ng-controller='defaultCtrl'>
<form name='myForm' novalidate ng-submit='addUser(newUser)'>
<div class="well">
<div class="form-group">
<label for="">Email:</label>
<input type="email" name='userEmail' class="form-control" required ng-model='newUser.email'/>
<div class="error" ng-show="myForm.userEmail.$invalid&&myForm.userEmail.$dirty">
{{getError(myForm.userEmail.$error)}}
</div>
</div>
<button type="submit" class="btn btn-primary btn-block" ng-disabled='myForm.$invalid'>OK</button>
</div>
</form>
</div>
</body>
</html>
更多关于AngularJS相关内容感兴趣的读者可查看本站专题：《AngularJS指令操作技巧总结》、《AngularJS入门与进阶教程》及《AngularJS MVC架构总结》
希望本文所述对大家AngularJS程序设计有所帮助。