What's the best way to mount a file on a field?

Question

What's the best way to mount a file on a field?

Can you assist in resolving this issue by utilizing a form on JSFiddle?

If a user fills out the following fields:

name, email, phone, message

The data should be output to the console.

However, if a user adds a file to the field

attachment

No output should appear in the console (console should display "55555").

JavaScript code:

briefApp.directive('attachmentValidate', function() {
    return {
        link: function($scope, element, attrs, ctrl) {
            $scope.$watch('attachment', function(value){
                console.log(55555);

            });            
        }
    };
});

I am looking for guidance on how to ensure that adding or removing a file triggers the 'attachmentValidate' controller and logs "55555" in the console.

javascript angularjs forms file angularjs-directive

Answer 1

Answer №1

As per the official documentation for AngularJS, available at https://docs.angularjs.org/api/ng/directive/input

It's important to note that not all features are supported for every input type. Specifically, data binding and event handling using ng-model is not supported for input[file].

To work around this limitation, you can try binding the file select event as a change event on the element.

     link: function($scope, element, attrs, ctrl) {
         element.bind('change', function(value){
           console.log("5555");
           console.log("Hurray");
        });
   });

Answer 2

As per the official documentation for AngularJS, available at https://docs.angularjs.org/api/ng/directive/input

It's important to note that not all features are supported for every input type. Specifically, data binding and event handling using ng-model is not supported for input[file].

To work around this limitation, you can try binding the file select event as a change event on the element.

     link: function($scope, element, attrs, ctrl) {
         element.bind('change', function(value){
           console.log("5555");
           console.log("Hurray");
        });
   });

Answer 3

Answer №2

When using input type="file, the ng-model does not automatically change; a directive must be used to achieve this functionality. The directive binds the change event of the file, so that when a new file is selected, its name is assigned to the specified ng-model variable.

Custom Directive

myApp.directive("fileUpdate", [function () {
    return {
        require: 'ngModel',
        link: function (scope, element, attributes, ngModel) {
            element.bind("change", function (changeEvent) {
                scope.$evalAsync(function () {
                    // Set the ng-model value to the selected file
                    ngModel.$setViewValue(changeEvent.target.files[0]);
                });
            });
        }
    }
}]);

HTML Usage

<input type="file" size="1" name="uploadFile" id="fileInput" 
ng-model="uploadedFile" file-update />

With the above directive, the scope value is updated, triggering the watch and executing console.log(12345).

See Demo on JSFiddle

Answer 4

When using input type="file, the ng-model does not automatically change; a directive must be used to achieve this functionality. The directive binds the change event of the file, so that when a new file is selected, its name is assigned to the specified ng-model variable.

Custom Directive

myApp.directive("fileUpdate", [function () {
    return {
        require: 'ngModel',
        link: function (scope, element, attributes, ngModel) {
            element.bind("change", function (changeEvent) {
                scope.$evalAsync(function () {
                    // Set the ng-model value to the selected file
                    ngModel.$setViewValue(changeEvent.target.files[0]);
                });
            });
        }
    }
}]);

HTML Usage

<input type="file" size="1" name="uploadFile" id="fileInput" 
ng-model="uploadedFile" file-update />

With the above directive, the scope value is updated, triggering the watch and executing console.log(12345).

See Demo on JSFiddle

What's the best way to mount a file on a field?

Answer №1

Answer №2

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