fileStorageUploadField

fileStorageUploadField allows users to upload a file to the Jmix file storage.

XML element: fileStorageUploadField
Java class: FileStorageUploadField

Basics

The component can contain a label, a link to the uploaded file, and an upload button. When the upload button is clicked, a standard file picker dialog pops up, allowing the user to select a file.

file storage upload basics

fileStorageUploadField can work both without being bound to an entity attribute and with data binding.

Below we will show an example of using the component without data binding. You can use it to handle the uploaded file directly without associating it with any Jmix entity.

<fileStorageUploadField id="fileRefField"
                        acceptedFileTypes=".xlsx, .xls"
                        fileStoragePutMode="MANUAL"
                        fileNameVisible="true"/>

Then you can handle the uploaded file directly within the FileUploadSucceededEvent.

To store a file in an entity attribute as a byte array instead of FileRef, use the fileUploadField component.

To upload multiple files simultaneously, you should use the upload component instead of fileStorageUploadField.

The uploaded file will be immediately stored in the default FileStorage. To control the saving of the file programmatically, use the fileStoragePutMode attribute.

Data Binding

fileStorageUploadField allows users to upload a file to the file storage and link it to an entity attribute as a FileRef object.

In the example below, the picture attribute of the User entity has the FileRef type.

@Column(name = "PICTURE", length = 1024)
private FileRef picture;

<data>
    <instance class="com.company.onboarding.entity.User" id="userDc">
        <fetchPlan extends="_base"/>
        <loader id="userDl"/>
    </instance>
</data>
<layout>
    <fileStorageUploadField dataContainer="userDc"
                            property="picture"
                            clearButtonVisible="true"
                            fileNameVisible="true"/>
</layout>

fileStorageUploadField has a link to the container specified in the dataContainer attribute; the property attribute contains the name of the entity attribute that is displayed in fileStorageUploadField.

Internationalization

All labels and messages in fileStorageUploadField are configurable.

file storage upload text attrs

The label attribute.
The uploadText attribute.
The requiredMessage attribute.
The fileNotSelectedText attribute.
The helperText attribute.
The fileTooBigText attribute.
The incorrectFileTypeText attribute.
The uploadDialogTitle attribute.
The remainingTimeText attribute.
The uploadDialogCancelText attribute.
The processingStatusText attribute.

connectingStatusText

Defines the text of status in the upload dialog when connection is set.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

fileNotSelectedText

Sets the text that is shown when fileNameVisible="true" and the file is not uploaded. If not set, the default "File is not selected" text is shown.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

fileTooBigText

Vaadin

Sets the text of exception when the file size exceeds the maxFileSize value.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

incorrectFileTypeText

Vaadin

Sets the text of the message that is shown when the file extension is not included to the acceptedFileTypes attribute.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

processingStatusText

Sets the text of status in the upload dialog when a file is uploaded and processed.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

remainingTimeText

Sets the text in the upload dialog when it shows the remaining time.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

remainingTimeUnknownText

Sets the text in the upload dialog when it cannot calculate the remaining time.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

uploadDialogCancelText

Sets the text to the cancel button in the upload dialog.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

uploadDialogTitle

Sets the title of the upload dialog that is shown while uploading a file.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

uploadText

Sets the text that should be shown in the upload button.

The attribute value can either be the text itself or a key in the message bundle. In case of a key, the value should begin with the msg:// prefix.

Attributes

acceptedFileTypes

Specifies the types of files that the server accepts. The acceptable file formats are set using MIME type patterns or file extensions.

MIME types are widely supported, while file extensions are only implemented in certain browsers, so it should be avoided.

<fileStorageUploadField dataContainer="userDc"
                        property="picture"
                        acceptedFileTypes="image/png, .png"/>

The acceptedFileTypes attribute filters the files displayed in the system file chooser dialog, ensuring users only select files with the allowed extensions.

clearButtonAriaLabel

MDN

Sets the aria-label attribute to the clear button.

clearButtonVisible

Sets whether the clear button should be shown after the file name. Works only if fileNameVisible="true".

The default value is false.

dropAllowed

Vaadin

Sets whether the component supports dropping files for uploading.

The default value is true.

File can only be dropped over the component’s Upload button.

fileNameVisible

The fileNameVisible attribute controls whether the name of the uploaded file is displayed next to the upload button. It is false by default.

fileStorageName

Sets the name of FileStorage where the upload file will be placed. If not set, the default FileStorage will be used.

fileStoragePutMode

Sets mode which determines when a file will be put into FileStorage. By default, the fileStoragePutMode attribute is set to the IMMEDIATE value. You can control the saving of the file programmatically if you set the fileStoragePutMode attribute to the MANUAL value:

<fileStorageUploadField id="manuallyControlledField"
                        dataContainer="userDc"
                        property="picture"
                        clearButtonVisible="true"
                        fileNameVisible="true"
                        fileStoragePutMode="MANUAL"/>

In the view controller, define the component itself, and the TemporaryStorage interface. Then subscribe to the event of successful uploads:

@Autowired
private TemporaryStorage temporaryStorage;
@ViewComponent
private FileStorageUploadField manuallyControlledField;
@Autowired
private Notifications notifications;

@Subscribe("manuallyControlledField")
public void onManuallyControlledFieldFileUploadSucceeded(
        final FileUploadSucceededEvent<FileStorageUploadField> event) {
    Receiver receiver = event.getReceiver();
    if (receiver instanceof FileTemporaryStorageBuffer) {
        UUID fileId = ((FileTemporaryStorageBuffer) receiver)
                .getFileData().getFileInfo().getId();
        File file = temporaryStorage.getFile(fileId);

        if (file != null) {
            notifications.create("File is uploaded to temporary storage at "
                            + file.getAbsolutePath())
                    .show();
        }
        FileRef fileRef = temporaryStorage.putFileIntoStorage(fileId, event.getFileName());
        manuallyControlledField.setValue(fileRef);
        notifications.create("Uploaded file: "
                        + ((FileTemporaryStorageBuffer) receiver).getFileData().getFileName())
                .show();
    }
}

The component will upload the file to the temporary storage and invoke FileUploadSucceedEvent.

The TemporaryStorage.putFileIntoStorage() method moves the uploaded file from the temporary client storage to the default File Storage.

The ComponentValueChangeEvent is not fired automatically after uploading the fileStorageUploadField field with MANUAL put mode, because the FileRef value can be obtained only after uploading a file to the permanent file storage.

maxFileSize

Vaadin

Specifies the maximum file size in bytes allowed to upload. Notice that it is a client-side constraint, which will be checked before sending the request.

If MultipartProperties is available, the default value will be set from MultipartProperties#getMaxFileSize() that is equal to 1Mb. To increase maximum file size for all fields in the application use MultipartProperties#getMaxFileSize() property.

uploadIcon

Sets an icon to the upload button.

Handlers

AttachEvent - ComponentValueChangeEvent - DetachEvent - FileUploadFailedEvent - FileUploadFileRejectedEvent - FileUploadFinishedEvent - FileUploadProgressEvent - FileUploadStartedEvent - FileUploadSucceededEvent - statusChangeHandler - validator

Чтобы сгенерировать заглушку обработчика в Jmix Studio, используйте вкладку Handlers панели инспектора Jmix UI, или команду Generate Handler, доступную на верхней панели контроллера экрана и через меню Code → Generate (Alt+Insert / Cmd+N).

FileUploadFailedEvent

io.jmix.flowui.kit.component.upload.event.FileUploadFailedEvent is fired when FailedEvent of Upload is occurred. See Upload.addFailedListener(ComponentEventListener) for details.

@Subscribe("manuallyControlledField")
public void onManuallyControlledFieldFileUploadFailed(
        final FileUploadFailedEvent<FileStorageUploadField> event) {
    notifications.create("File upload error")
            .show();
}

FileUploadFileRejectedEvent

io.jmix.flowui.kit.component.upload.event.FileUploadFileRejectedEvent is fired when FileRejectedEvent of Upload is occurred. See Upload.addFileRejectedListener(ComponentEventListener) for details.

FileUploadFinishedEvent

io.jmix.flowui.kit.component.upload.event.FileUploadFinishedEvent is fired when FinishedEvent of Upload is occurred. See Upload.addFinishedListener(ComponentEventListener) for details.

FileUploadProgressEvent

io.jmix.flowui.kit.component.upload.event.FileUploadProgressEvent is fired when ProgressUpdateEvent of Upload is occurred. See Upload.addProgressListener(ComponentEventListener) for details.

FileUploadStartedEvent

io.jmix.flowui.kit.component.upload.event.FileUploadStartedEvent is fired when StartedEvent of Upload is occurred. See Upload.addStartedListener(ComponentEventListener) for details.

FileUploadSucceededEvent

io.jmix.flowui.kit.component.upload.event.FileUploadSucceededEvent is fired when the Upload component’s SucceededEvent occurs, meaning the upload has been successfully received. See Upload.addSucceededListener(ComponentEventListener) for details.

Here is an example of using fileStorageUploadField for .xls и .xlsx files, and then processing those files in FileUploadSucceededEvent.

@Subscribe("fileRefField")
public void onFileRefFieldFileUploadSucceeded(
        final FileUploadSucceededEvent<FileStorageUploadField> event) {
    if (event.getReceiver() instanceof FileTemporaryStorageBuffer buffer) {
        UUID fileId = buffer.getFileData().getFileInfo().getId();
        log.info("FileId: " + fileId);

        File file = temporaryStorage.getFile(fileId); (1)
        log.info("File from temp storage: " + file);
        try { (2)
            List<String> lines = FileUtils.readLines(file, StandardCharsets.UTF_8);
            for (String line : lines) {
                log.info("Read line: " + line);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        temporaryStorage.deleteFile(fileId); (3)
        log.info("File is deleted from temp storage: " + file);
    }
}

1	Get local file from the temporary storage using identifier provided by the upload event.
2	Process the file data.
3	Remove the uploaded file. In a real-world application you would move the file to FileStorage here using the `temporaryStorage.putFileIntoStorage()` method.

You can also find an example of FileUploadSucceededEvent in the fileStoragePutMode description.

Elements