僅在提交或用戶輸入時驗證表單域

Question

我有使用required驗證的表單域。問題是，表單呈現時立即顯示錯誤。我只希望它在用戶實際輸入文本字段或提交後顯示。

我該如何執行此操作？

Answer 1

使用$dirty標誌顯示錯誤的用戶後，才與輸入互動：

<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> 

如果你想在用戶提交表單後，才比你可以使用一個單獨的標誌變量來觸發錯誤在：

<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 ... 
    } 
}; 

然後，如果所有的JS裏面ng-show表情看起來太適合你，你可以抽象成一個獨立的實現方法具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

埃裏克·艾格納，

請使用$髒（現場已被修改）和$無效（字段內容無效）。

請檢查下面的角表單驗證

1）

驗證例如HTML示例用於用戶輸入的輸入：

<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）

驗證例如HTML/JS用於用戶提交：

 <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> 

自定義指令：

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-切換功能：

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

如果您想在表單提交中顯示錯誤消息，則可以使用條件form.$submitted來檢查是否嘗試提交表單。檢查下面的例子。

<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窗體狀態form.$submitted。 最初form.$submitted的值將爲false，成功提交表單後將變爲true。表單元素上驗證

Answer 5

調用可以通過該元素上的觸發改變事件進行處理：

一個）爲例：觸發改變分離元件上形式

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

B）爲例：觸發改變事件每個例如在NG-提交，NG-點擊，NG-模糊的表單元素...

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）和另一種方式爲

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