如何在angularjs中使用必填项验证文件？

Question

Hi I am developing angularjs application. I have file upload module. Below is my html code.

<input type="file"  file-modelsr="myFileID" name="fileupld" valid-files required />

On submitting form I am trying to get something like this below.

console.log(form2.fileupld.$valid);

This always gives me undefined. How can i check file has been uploaded or not on submitting the form?

I have used below directive.

myapp.directive('validFiles', function () {
    return {
        require: 'ngModel',
        link: function (scope, el, attrs, ngModel) {
            //change event is fired when file is selected
            el.bind('change', function () {
                debugger;
                scope.$apply(function () {
                    ngModel.$setViewValue(el.val());
                    ngModel.$render();
                })
            })
        }
    }
})

I used below directive to upload files.

myapp.directive('fileModelsr', ['$parse', function ($parse) {
    return {
        restrict: 'A',
        link: function (scope, element, attrs) {
            var model = $parse(attrs.fileModelsr);
            var modelSetter = model.assign;
            element.bind('change', function () {
                scope.$apply(function () {
                    modelSetter(scope, element[0].files[0]);
                });
            });
        }
    };
}]);

How can I apply required file validation in AngularJS?

Answer 1

You can change your fileModel directive to the following and get rid of validFiles directive. Check if your fileModelsr has any value or not and validate based on this.

JS :

.directive('fileModel', ['$parse', '$rootScope', function($parse, $rootScope) {
    return {
        restrict: 'A',
        link: function(scope, element, attrs) {
            var model = $parse(attrs.fileModelsr);
            var modelSetter = model.assign;
            element.bind('change', function() {
                scope.$apply(function() {
                    modelSetter(scope, element[0].files[0]);
                    if (element[0].files[0]) {
                        $rootScope.fileUploaded = true;
                    }
                });
            });
        }
    };
}])

HTML :

<input type="file" file-modelsr="myFileID" name="fileupld" required />
<button type="submit" name="submit" class="btn btn-primary" ng-disabled="!fileUploaded" ng-click="uploadFile()">Submit</button>