在angularjs表單驗證中提交表單之前顯示的錯誤消息

Question

我使用angularjs進行了表單驗證。 但我遇到的問題是頁面加載時顯示的錯誤消息。 但是這個消息會在收到錯誤后顯示出來。 只是我想要使用指令設置驗證摘要的余數。 我能做什么？

我的代碼如下：

<label>UserName</label>
<input type="text" class="form-control" name="UserName" ng-model="userVM.UserName" required ng-minlength="8" ng-maxlength="20" />
<div validation-message ng-show="customerForm.UserName.$error.required" class="error">
                    Username is required
</div>

指令如下

NusPayApp.directive("validationSummary", function () {
    return {
        restrict: "A",
        require: "^form",

        template: "<div class='alert alert-warning'><a class='close' ng-click='toggleValidationSummary()'>×</a><h4 class='alert-heading'>Warning!</h4><li ng-repeat='(expression,message) in validationMessages'>{{message}}</li></ul></div>",
        link: function (scope, element, attributes, controller) {

            scope.validationMessages = {};

            // Hooks up a watch using [ng-show] expression
            controller.watchValidation = function (expression, message) {

                // watch the return value from the scope.$eval(expression)
                scope.$watch(function () { return scope.$eval(expression); }, function (isVisible) {

                    // check if the validation message exists
                    var containsMessage = scope.validationMessages.hasOwnProperty(expression);

                    // if the validation message doesn't exist and it should be visible, add it to the list
                    if (!containsMessage && isVisible) {
                        scope.validationMessages[expression] = message;
                    }

                    // if the validation message does exist and it shouldn't be visible, delete it
                    if (containsMessage && !isVisible) {
                        delete scope.validationMessages[expression];
                    }
                });
            };
        }
    };
});

讓我幫忙給我一些建議。 我需要確保在表單提交后顯示錯誤消息。

Answer 1

您可以在范圍中添加新變量以檢查表單是否已提交。

$scope.isFormSubmit = false

然后，如果您的表單有錯誤，則將此標志更新為true

if($scope.form.$valid)
{
      //Submit your form
      $scope.isFormSubmit = false
}
else
{
     $scope.isFormSubmit = true
}

將您的HTML代碼更新為

<div validation-message ng-show="customerForm.UserName.$error.required && isFormSubmit" class="error">
 Username is required
</div>