仅在提交或用户输入时验证表单域

Question

我有使用required验证的表单域。问题是，表单呈现时立即显示错误。我只希望它在用户实际输入文本字段或提交后显示。

我该如何执行此操作？

Answer 1

使用$dirty标志显示错误的用户后，才与输入互动：

<div> 
    <input type="email" name="email" ng-model="user.email" required /> 
    <span ng-show="form.email.$dirty && form.email.$error.required">Email is required</span> 
</div> 

如果你想在用户提交表单后，才比你可以使用一个单独的标志变量来触发错误在：

<form ng-submit="submit()" name="form" ng-controller="MyCtrl"> 
    <div> 
    <input type="email" name="email" ng-model="user.email" required /> 
    <span ng-show="(form.email.$dirty || submitted) && form.email.$error.required"> 
     Email is required 
    </span> 
    </div> 

    <div> 
    <button type="submit">Submit</button> 
    </div> 
</form> 

function MyCtrl($scope){ 
    $scope.submit = function(){ 
    // Set the 'submitted' flag to true 
    $scope.submitted = true; 
    // Send the form to server 
    // $http.post ... 
    } 
}; 

然后，如果所有的JS里面ng-show表情看起来太适合你，你可以抽象成一个独立的实现方法具d：

function MyCtrl($scope){ 
    $scope.submit = function(){ 
    // Set the 'submitted' flag to true 
    $scope.submitted = true; 
    // Send the form to server 
    // $http.post ... 
    } 

    $scope.hasError = function(field, validation){ 
    if(validation){ 
     return ($scope.form[field].$dirty && $scope.form[field].$error[validation]) || ($scope.submitted && $scope.form[field].$error[validation]); 
    } 
    return ($scope.form[field].$dirty && $scope.form[field].$invalid) || ($scope.submitted && $scope.form[field].$invalid); 
    }; 

}; 

<form ng-submit="submit()" name="form"> 
    <div> 
    <input type="email" name="email" ng-model="user.email" required /> 
    <span ng-show="hasError('email', 'required')">required</span> 
    </div> 

    <div> 
    <button type="submit">Submit</button> 
    </div> 
</form> 

Answer 2

埃里克·艾格纳，

请使用$脏（现场已被修改）和$无效（字段内容无效）。

请检查下面的角表单验证

1）

验证例如HTML示例用于用户输入的输入：

<form ng-app="myApp" ng-controller="validateCtrl" name="myForm" novalidate> 
    <p>Email:<br> 
    <input type="email" name="email" ng-model="email" required> 
    <span ng-show="myForm.email.$dirty && myForm.email.$invalid"> 
     <span ng-show="myForm.email.$error.required">Email is required.</span> 
     <span ng-show="myForm.email.$error.email">Invalid email address.</span> 
     </span> 
    </p> 
    </form> 

2）

验证例如HTML/JS用于用户提交：

 <form ng-app="myApp" ng-controller="validateCtrl" name="myForm" novalidate form-submit-validation=""> 
     <p>Email:<br> 
     <input type="email" name="email" ng-model="email" required> 
     <span ng-show="submitted || myForm.email.$dirty && myForm.email.$invalid"> 
      <span ng-show="myForm.email.$error.required">Email is required.</span> 
      <span ng-show="myForm.email.$error.email">Invalid email address.</span> 
      </span> 
     </p> 
<p> 
    <input type="submit"> 
</p> 
</form> 

自定义指令：

app.directive('formSubmitValidation', function() { 

     return { 
      require: 'form', 
      compile: function (tElem, tAttr) { 

       tElem.data('augmented', true); 

       return function (scope, elem, attr, form) { 
        elem.on('submit', function ($event) { 
         scope.$broadcast('form:submit', form); 

         if (!form.$valid) { 
          $event.preventDefault(); 
         } 
         scope.$apply(function() { 
          scope.submitted = true; 
         }); 


        }); 
       } 
      } 
     }; 


    }) 

3）

你不希望像下面

<form ng-app="myApp" ng-controller="validateCtrl" name="myForm" novalidate ng-change="submitFun()"> 
     <p>Email:<br> 
     <input type="email" name="email" ng-model="email" required> 
     <span ng-show="submitted || myForm.email.$dirty && myForm.email.$invalid"> 
      <span ng-show="myForm.email.$error.required">Email is required.</span> 
      <span ng-show="myForm.email.$error.email">Invalid email address.</span> 
      </span> 
     </p> 
<p> 
    <input type="submit"> 
</p> 
</form> 

控制器SubmitFun（）JS使用指令使用NG-切换功能：

var app = angular.module('example', []); 
app.controller('exampleCntl', function($scope) { 
$scope.submitFun = function($event) { 
$scope.submitted = true; 
    if (!$scope.myForm.$valid) 
    { 
     $event.preventDefault(); 
    } 
    } 

}）;

Answer 3

如果您想在表单提交中显示错误消息，则可以使用条件form.$submitted来检查是否尝试提交表单。检查下面的例子。

<form name="myForm" novalidate ng-submit="myForm.$valid && createUser()"> 
    <input type="text" name="name" ng-model="user.name" placeholder="Enter name of user" required> 
    <div ng-messages="myForm.name.$error" ng-if="myForm.$submitted"> 
    <div ng-message="required">Please enter user name.</div> 
    </div> 

    <input type="text" name="address" ng-model="user.address" placeholder="Enter Address" required ng-maxlength="30"> 
    <div ng-messages="myForm.name.$error" ng-if="myForm.$submitted"> 
    <div ng-message="required">Please enter user address.</div> 
    <div ng-message="maxlength">Should be less than 30 chars</div> 
    </div> 

    <button type="submit"> 
    Create user 
    </button> 
</form> 

Answer 4

您可以使用angularjs窗体状态form.$submitted。 最初form.$submitted的值将为false，成功提交表单后将变为true。表单元素上验证

Answer 5

调用可以通过该元素上的触发改变事件进行处理：

一个）为例：触发改变分离元件上形式

$scope.formName.elementName.$$element.change(); 

B）为例：触发改变事件每个例如在NG-提交，NG-点击，NG-模糊的表单元素...

vm.triggerChangeForFormElements = function() { 
    // trigger change event for each of form elements 
    angular.forEach($scope.formName, function (element, name) { 
     if (!name.startsWith('$')) { 
      element.$$element.change(); 
     } 
    }); 
}; 

c）和另一种方式为

var handdleChange = function(form){ 
     var formFields = angular.element(form)[0].$$controls; 
     angular.forEach(formFields, function(field){ 
      field.$$element.change(); 
     }); 
    };