AngularJS的表单验证大致有两种，一种是手动验证，一种是自动验证。
手动验证
所谓手动验证是通过AngularJS表单的属性来验证。而成为AngularJS表单必须满足两个条件：1、给form元素加上novalidate="novalidate"；2、给form元素加上name="theForm"，如下：
<!DOCTYPE html> <html lang="en" ng-app="myApp1"> <head> <meta charset="UTF-8"> <title></title> <link rel="stylesheet" href="../node_modules/bootstrap/dist/css/bootstrap.min.css"/> <link rel="stylesheet" href="../css/main.css"/> </head> <body> <nav class="navbar navbar-inverse navbar-fixed-top"> <div class="container"> <div class="navbar-header"> <a href="/" class="navbar-brand">Form Submitting</a> </div> </div> </nav> <div class="container main-content" ng-controller="myCtrl1"> <!--novalidate让表单不要使用html验证--> <!--theForm变成scope的一个字段--> <form ng-submit="onSubmit(theForm.$valid)" novalidate="novalidate" name="theForm"> <div class="form-group"> <label for="name">Name</label> <input type="text" class="form-control" id="name" ng-model="formModel.name"/> </div> <div class="form-group" ng-class="{ 'has-error': !theForm.email.$valid && (!theForm.$pristine || theForm.$submitted), 'has-success': theForm.email.$valid && (!theForm.$pristine || theForm.$submitted) }"> <label for="email">Email</label> <input type="email" class="form-control" id="email" ng-model="formModel.email" required="required" name="email"/> <p class="help-block" ng-show="theForm.email.$error.required && (!theForm.$pristine || theForm.$submitted)">必填</p> <p class="help-block" ng-show="theForm.email.$error.email && (!theForm.$pristine || theForm.$submitted)">email格式不正确</p> </div> <div class="form-group"> <label for="username">Username</label> <input type="text" class="form-control" id="username" ng-model="formModel.username"/> </div> <div class="form-group"> <label for="age">Age</label> <input type="number" class="form-control" id="age" ng-model="formModel.age"/> </div> <div class="form-group"> <label for="sex">Sex</label> <select name="sex" id="sex" class="form-control" ng-model="formModel.sex"> <option value="">Please choose</option> <option value="male">Mail</option> <option value="femail">Femail</option> </select> </div> <div class="form-group"> <label for="password">Password</label> <input type="text" class="form-control" id="password" ng-model="formModel.password"/> </div> <div class="form-group"> <button class="btn btn-primary" type="submit">Register</button> </div> <pre> {{theForm | json}} </pre> </form> </div> <script src="../node_modules/angular/angular.min.js"></script> <script src="second.js"></script> </body> </html>
以上，
● 给form加上novalidate="novalidate"意味着表单将不再使用HTML5验证特性
● 给form加上name="theForm"意味着表单的名称是theForm。如何使用theForm,比如我们验证表单是否被修改过theForm.$submitted
● 通过ng-submit提交表单
● formModel是$scope中的一个属性
● 对表单的Email进行了手动验证，使用了AngularJS表单的众多属性，比如theForm.email.$valid，theForm.$pristine，theForm.$submitted， theForm.email.$error.required，theForm.email.$error.email
● 通过<pre>{{theForm | json}}</pre>把AngularJS表单的所有属性都打印出来
{ "$error": { "required": [ { "$validators": {}, "$asyncValidators": {}, "$parsers": [], "$formatters": [ null ], "$viewChangeListeners": [], "$untouched": true, "$touched": false, "$pristine": true, "$dirty": false, "$valid": false, "$invalid": true, "$error": { "required": true }, "$name": "email", "$options": null } ] }, "$name": "theForm", "$dirty": false, "$pristine": true, "$valid": false, "$invalid": true, "$submitted": false, "email": { "$validators": {}, "$asyncValidators": {}, "$parsers": [], "$formatters": [ null ], "$viewChangeListeners": [], "$untouched": true, "$touched": false, "$pristine": true, "$dirty": false, "$valid": false, "$invalid": true, "$error": { "required": true }, "$name": "email", "$options": null }, "sex": { "$validators": {}, "$asyncValidators": {}, "$parsers": [], "$formatters": [], "$viewChangeListeners": [], "$untouched": true, "$touched": false, "$pristine": true, "$dirty": false, "$valid": true, "$invalid": false, "$error": {}, "$name": "sex", "$options": null } }
以上，凡是有name属性的input都被显示在上面。
在second.js文件中定义了module,controller以及提交表单的方法。
var myApp1 = angular.module('myApp1',[]); myApp1.controller('myCtrl1', function($scope, $http){ $scope.formModel = {}; $scope.onSubmit = function(){ $http.post('someurl',$scope.formModel) .success(function(data){ console.log(':)'); }) .error(function(data){ console.log(':('); }); console.log($scope.formModel); }; });
以上的表单验证方式好处是可控性强，但相对繁琐。
自动验证
AngularJS的另外一种表单验证方式是自动验证，即通过directive来实现，除了AngularJS自带的directive,还需要用到angular-auto-validate这个第三方module。
有关angular-auto-validate：
● 网址：https://github.com/jonsamwell/angular-auto-validate
● 安装：npm i angular-auto-validate
● 引用：<script src="../node_modules/angular-auto-validate/dist/jcs-auto-validate.min.js"></script>
● module依赖：var myApp = angular.module("app", ["jcs-autoValidate"]);
为了实现错误信息本地化，还需要angular-localize这个第三方module：
● 安装：npm install angular-localize --save
● module依赖：var myApp = angular.module("app", ["localize"]);
● 引用：
<script src="../node_modules/angular-sanitize/angular-sanitize.min.js"></script>
<script src="../node_modules/angular-localize/angular-localize.min.js"></script>
此外，当点击提交表单按钮，需要禁用按钮并显示一种等待效果，需要用到angular-ladda这个第三方module:
● 安装：bower install angular-ladda --save
● module依赖：var myApp = angular.module("app", ["angular-ladda"]);
● 引用：
<link rel="stylesheet" href="../bower_components/ladda/dist/ladda-themeless.min.css"/>
<script src="../bower_components/ladda/dist/spin.min.js"></script>
<script src="../bower_components/ladda/dist/ladda.min.js"></script>
<script src="../bower_components/angular-ladda/dist/angular-ladda.min.js"></script>
页面如下：
<!DOCTYPE html> <html lang="en" ng-app="myApp1"> <head> <meta charset="gb2312"> <title></title> <link rel="stylesheet" href="../node_modules/bootstrap/dist/css/bootstrap.min.css"/> <link rel="stylesheet" href="../bower_components/ladda/dist/ladda-themeless.min.css"/> <link rel="stylesheet" href="../css/main.css"/> </head> <body> <nav class="navbar navbar-inverse navbar-fixed-top"> <div class="container"> <div class="navbar-header"> <a href="/" class="navbar-brand">Form Validating Auto</a> </div> </div> </nav> <div class="container main-content" ng-controller="myCtrl1"> <!--novalidate让表单不要使用html验证--> <!--theForm变成scope的一个字段--> <form ng-submit="onSubmit()" novalidate="novalidate"> <div class="form-group"> <label for="name" class="control-label">Name</label> <input type="text" class="form-control" id="name" ng-model="formModel.name" required="required"/> </div> <div class="form-group"> <label for="email" class="control-label">Email</label> <input type="email" class="form-control" id="email" ng-model="formModel.email" required="required"/> </div> <div class="form-group"> <label for="username" class="control-label">Username</label> <input type="text" class="form-control" id="username" ng-model="formModel.username" required="required" ng-pattern="/^[A-Za-z0-9_]{1,32}$/" ng-minlength="7" ng-pattern-err-type="badUsername" /> </div> <div class="form-group"> <label for="age" class="control-label">Age</label> <input type="number" class="form-control" id="age" ng-model="formModel.age" required="required" min="18" max="65" ng-min-err-type="tooYoung" ng-max-err-type="tooOld" /> </div> <div class="form-group"> <label for="sex" class="control-label">Sex</label> <select name="sex" id="sex" class="form-control" ng-model="formModel.sex" required="required"> <option value="">Please choose</option> <option value="male">Mail</option> <option value="femail">Femail</option> </select> </div> <div class="form-group"> <label for="password" class="control-label">Password</label> <input type="text" class="form-control" id="password" ng-model="formModel.password" required="required" ng-minlength="6"/> </div> <div class="form-group"> <!--<button class="btn btn-primary" ng-click="onSubmit()">Register</button>--> <button class="btn btn-primary" ladda = "submitting" data-style="expand-right" type="submit"> <span ng-show="submitting">正在注册...</span> <span ng-show="!submitting">注册</span> </button> </div> <pre> {{formModel | json}} </pre> </form> </div> <script src="../node_modules/angular/angular.min.js"></script> <script src="form_validation_auto.js"></script> <script src="../node_modules/angular-auto-validate/dist/jcs-auto-validate.min.js"></script> <script src="../node_modules/angular-sanitize/angular-sanitize.min.js"></script> <script src="../node_modules/angular-localize/angular-localize.min.js"></script> <script src="../bower_components/ladda/dist/spin.min.js"></script> <script src="../bower_components/ladda/dist/ladda.min.js"></script> <script src="../bower_components/angular-ladda/dist/angular-ladda.min.js"></script> </body> </html>
以上，先看提交按钮：
<div class="form-group"> <!--<button class="btn btn-primary" ng-click="onSubmit()">Register</button>--> <button class="btn btn-primary" ladda = "submitting" data-style="expand-right" type="submit"> <span ng-show="submitting">正在注册...</span> <span ng-show="!submitting">注册</span> </button> </div>
● ladda属性值为bool值，true表示显示动态等待效果，false不显示动态等待效果，这里的submitting是scope中的一个属性
● data-style="expand-right"表示在按钮的右侧显示动态等待效果
再拿表单中的Age字段来说：
<div class="form-group"> <label for="age" class="control-label">Age</label> <input type="number" class="form-control" id="age" ng-model="formModel.age" required="required" min="18" max="65" ng-min-err-type="tooYoung" ng-max-err-type="tooOld" /> </div>
其中,min, max为AgularJS的directive,而ng-min-err-type是angular-auto-validate的directive。这里遵循的惯例是ng-AngularJS表单验证的directive名称-err-type，而tooYoung和tooOld的作用是什么，又是在哪里用上了呢？
是在module层面用上了，定义在了form_validation_auto.js文件中。
var myApp1 = angular.module('myApp1',['jcs-autoValidate','localize','angular-ladda']); myApp1.run(function(defaultErrorMessageResolver){ defaultErrorMessageResolver.getErrorMessages().then(function(errorMessages){ errorMessages['tooYoung'] = '年龄必须小于{0}'; errorMessages['tooOld'] = '年龄不能大于{0}'; errorMessages['badUsername'] = '用户名只能包含数字、字母或下划线'; }); }); myApp1.controller('myCtrl1', function($scope, $http){ $scope.formModel = {}; $scope.submitting = false; $scope.onSubmit = function(){ $scope.submitting = true; console.log('已提交'); console.log($scope.formModel); $http.post('url',$scope.formModel) .success(function(data){ console.log(':)'); $scope.submitting = false; }) .error(function(data){ console.log(':('); $scope.submitting = false; }); }; });
以上，在run方法中使用angular-auto-validate的defaultErrorMessageResolver服务，对错误信息进行为了自定义。页面上的tooYoung和tooOld和这里的errorMessages['tooYoung']和errorMessages['badUsername']对应。