最近在学习angular，那么今天也算个学习笔记吧！
html
<div ng-class="{'has-error': myForm.myName.$touched && myForm.myName.$invalid}"> <label>name</label> <div> <input type="text" ng-model="formData.username" placeholder="2-10个中英文字符，aaa会重名，必填" name-check minlength="2" maxlength="10" required> </div> <div ng-messages="myForm.myName.$error" ng-messages-include="demos/form/error.html" ng-show="myForm.myName.$touched"> </div> </div>
ng-messages="myForm.myName.$error" 给出错误类型(required, char, exist, minlength)
error.html
<span ng-message="required">必填</span> <span ng-message="char">非法字符</span> <span ng-message="exist">名称已存在</span> <span ng-message="minlength">太短了</span>
directive name-check 利用ngModel 的$validators,& $asyncValidators 添加自定义验证
app.directive('nameCheck', nameCheck); nameCheck.$inject = ['HttpService', '$q']; function nameCheck(HttpService, $q){ var NAME_REG = /^[a-zA-Z\u4e00-\u9fa5]+$/; return { restrict: 'A', require: 'ngModel', link:function($scope,element,attrs,ctrl){ ctrl.$validators.char = function(modelValue, viewValue) { var value = modelValue || viewValue; if(!NAME_REG.test(value)){ return false; } return true; }; ctrl.$asyncValidators.exist = function(modelValue, viewValue){ var value = modelValue || viewValue; var deferred = $q.defer(); HttpService.get('api/users/' + value).then(function(res) { if(res.isExist){ deferred.reject(false); } deferred.resolve(true); }) return deferred.promise; } } } }