Configuration

An object defining configuration options for the FileUploader widget.

accept

Specifies a file type or several types accepted by the widget.

Type:

String

Default Value: ''

The value of this option is passed to the accept attribute of the underlying input element. Thus, the option accepts a MIME type or several types separated by a comma. Refer to the input element documentation for information on available values.

View Demo

accessKey

Specifies the shortcut key that sets focus on the widget.

Type:

String

Default Value: null

The value of this option will be passed to the accesskey attribute of the HTML element that underlies the widget.

activeStateEnabled

Specifies whether or not the widget changes its state when interacting with a user.

Type:

Boolean

Default Value: false

This option is used when the widget is displayed on a platform whose guidelines include the active state change for widgets.

allowCanceling

Specifies if an end user can remove a file from the selection and interrupt uploading.

Type:

Boolean

Default Value: true

If this option is set to true, a cancel button is displayed for each selected file.

NOTE
This option applies only if the uploadMode is not set to "useForm".

allowedFileExtensions

Restricts file extensions that can be uploaded to the server.

Type:

Array<String>

Default Value: []

chunkSize

Specifies the chunk size in bytes. Applies only if uploadMode is "instantly" or "useButtons". Requires a server that can process file chunks.

Type:

Number

Default Value: 0

Set this option to a positive value to enable a chunked upload. Each request to the server will contain the following information:

{
    FileGuid: string,   
    FileName: string,   
    FileType: string,   
    FileSize: long,
    Index: long,        // The chunk's index
    TotalCount: long,   // The file's total chunk count
}

View Demo

disabled

Specifies whether the widget responds to user interaction.

Type:

Boolean

Default Value: false

elementAttr

Specifies the attributes to be attached to the widget's root element.

Type:

Object

Default Value: {}
jQuery
$(function(){
    $("#fileUploaderContainer").dxFileUploader({
        // ...
        elementAttr: {
            id: "elementId",
            class: "class-name"
        }
    });
});
Angular
HTML
TypeScript
<dx-file-uploader ...
    [elementAttr]="{ id: 'elementId', class: 'class-name' }">
</dx-file-uploader>
import { DxFileUploaderModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxFileUploaderModule
    ],
    // ...
})
ASP.NET MVC Control
Razor C#
Razor VB
@(Html.DevExtreme().FileUploader()
    .ElementAttr("class", "class-name")
    // ===== or =====
    .ElementAttr(new {
        @id = "elementId",
        @class = "class-name"
    })
    // ===== or =====
    .ElementAttr(new Dictionary<string, object>() {
        { "id", "elementId" },
        { "class", "class-name" }
    })

)
@(Html.DevExtreme().FileUploader() _
    .ElementAttr("class", "class-name")
    ' ===== or =====
    .ElementAttr(New With {
        .id = "elementId",
        .class = "class-name"
    })
    ' ===== or =====
    .ElementAttr(New Dictionary(Of String, Object) From {
        { "id", "elementId" },
        { "class", "class-name" }
    })
)

focusStateEnabled

Specifies whether the widget can be focused using keyboard navigation.

Type:

Boolean

Default Value: false, true (desktop)

height

Specifies the widget's height.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The widget's height.

Default Value: undefined

This option accepts a value of one of the following types:

  • Number
    The height in pixels.

  • String
    A CSS-accepted measurement of height. For example, "55px", "80%", "auto", "inherit".

  • Function
    A function returning either of the above. For example:

    JavaScript
    height: function() {
        return window.innerHeight / 1.5;
    }

hint

Specifies text for a hint that appears when a user pauses on the widget.

Type:

String

Default Value: undefined

hoverStateEnabled

Specifies whether the widget changes its state when a user pauses on it.

Type:

Boolean

Default Value: false

invalidFileExtensionMessage

The text displayed when the extension of the file being uploaded is not an allowed file extension.

Type:

String

Default Value: 'File type is not allowed'

invalidMaxFileSizeMessage

The text displayed when the size of the file being uploaded is greater than the maxFileSize.

Type:

String

Default Value: 'File is too large'

invalidMinFileSizeMessage

The text displayed when the size of the file being uploaded is less than the minFileSize.

Type:

String

Default Value: 'File is too small'

isValid

Specifies whether the editor's value is valid.

Type:

Boolean

Default Value: true

In Knockout apps, you may need to inform a user about an error that occurred during the validation of a view model field. For this purpose, set the editor's isValid option to the isValid value of the dxValidator that validates this field. To show an error message, set the editor's validationError option to the dxValidator's validationError value.

JavaScript
var editorValue = ko.observable("").extend({
    dxValidator: {
        validationRules: [{
            type: "required",
            message: "Specify this value"
        }]
    }
});
var viewModel = {
    editorOptions: {
        value: editorValue,
        isValid: editorValue.dxValidator.isValid,
        validationError: editorValue.dxValidator.validationError
    }
};

The editor's isValid and validationError options should also be specified when using a custom validation engine. In this instance, the validation result will be displayed for the editor by the means of the DevExtreme Validation UI.

See Also

labelText

Specifies the text displayed on the area to which an end-user can drop a file.

Type:

String

Default Value: 'or Drop file here'

maxFileSize

Specifies the maximum file size (in bytes) allowed for uploading. Applies only if uploadMode is "instantly" or "useButtons".

Type:

Number

Default Value: 0

minFileSize

Specifies the minimum file size (in bytes) allowed for uploading. Applies only if uploadMode is "instantly" or "useButtons".

Type:

Number

Default Value: 0

multiple

Specifies whether the widget enables an end-user to select a single file or multiple files.

Type:

Boolean

Default Value: false

name

Specifies the value passed to the name attribute of the underlying input element.

Type:

String

Default Value: ''

onContentReady

A function that is executed when the widget's content is ready and each time the content is changed.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only when using Knockout.

Default Value: null

onDisposing

A function that is executed before the widget is disposed of.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if you use Knockout.

Default Value: null

onInitialized

A function that is executed only once, after the widget is initialized.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

Default Value: null

You cannot access widget elements in this function because it is executed before they are ready. Use the onContentReady function instead.

onOptionChanged

A function that is executed after a widget option is changed.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

name:

String

The option's short name.

fullName:

String

The option's full name.

value: any

The option's new value.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if you use Knockout.

Default Value: null

onProgress

A function that is executed when a file segment is uploaded.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if Knockout is used.

file:

File

An uploaded file.

segmentSize:

Number

The size of the uploaded file segment.

bytesLoaded:

Number

The total count of the uploaded bytes.

bytesTotal:

Number

The total count of bytes in the XMLHttpRequest.

jQueryEvent:

jQuery.Event

The jQuery event that caused the handler execution. Deprecated in favor of the event field.

event:

Event (jQuery or dxEvent)

The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.

An XMLHttpRequest for the file.

Default Value: null

onUploadAborted

A function that is executed when the file upload is aborted.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if Knockout is used.

file:

File

The uploaded file.

jQueryEvent:

jQuery.Event

The jQuery event that caused the handler execution. Deprecated in favor of the event field.

event:

Event (jQuery or dxEvent)

The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Specifies an XMLHttpRequest for the file.

Default Value: null

onUploaded

A function that is executed when a file is successfully uploaded.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if Knockout is used.

file:

File

The uploaded file.

jQueryEvent:

jQuery.Event

The jQuery event that caused the handler execution. Deprecated in favor of the event field.

event:

Event (jQuery or dxEvent)

The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Specifies an XMLHttpRequest for the file.

Default Value: null

onUploadError

A function that is executed when an error occurs during the file upload.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if Knockout is used.

file:

File

The uploaded file.

jQueryEvent:

jQuery.Event

The jQuery event that caused the handler execution. Deprecated in favor of the event field.

event:

Event (jQuery or dxEvent)

The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Specifies an XMLHttpRequest for the file.

Default Value: null

The following code shows how you can handle a network error.

jQuery
JavaScript
$(function(){
    $("#fileUploader").dxFileUploader({
        // ...
        onUploadError: function(e){
            var xhttp = e.request;
            if (xhttp.readyState == 4 && xhttp.status == 0) {
                console.log("Connection refused.");
            }
        }
    });
});
Angular
TypeScript
HTML
export class AppComponent {
    handleNetworkError (e) {
        var xhttp = e.request;
        if (xhttp.readyState == 4 && xhttp.status == 0) {
            console.log("Connection refused.");
        }      
    }
}
<dx-file-uploader ...
    (onUploadError)="handleNetworkError($event)">
</dx-fileUploader>

onUploadStarted

A function that is executed when the file upload is started.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if Knockout is used.

file:

File

The uploaded file.

jQueryEvent:

jQuery.Event

The jQuery event that caused the handler execution. Deprecated in favor of the event field.

event:

Event (jQuery or dxEvent)

The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Specifies an XMLHttpRequest for the file.

Default Value: null

onValueChanged

A function that is executed when one or several files are added to or removed from the selection.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

FileUploader

The widget's instance.

element:

Element (jQuery or HTML)

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model:

Object

The model data. Available only if Knockout is used.

value:

Array<File>

Newly selected files.

previousValue:

Array<File>

Previously selected files.

jQueryEvent:

jQuery.Event

The jQuery event that caused the handler execution. Deprecated in favor of the event field.

event:

Event (jQuery or dxEvent)

The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Default Value: null

progress

Gets the current progress in percentages.

Type:

Number

Default Value: 0

readOnly

A Boolean value specifying whether or not the widget is read-only.

Type:

Boolean

Default Value: false

readyToUploadMessage

The message displayed by the widget when it is ready to upload the specified files.

Type:

String

Default Value: 'Ready to upload'

This option makes sense only if the uploadMode option is set to "useButtons".

rtlEnabled

Switches the widget to a right-to-left representation.

Type:

Boolean

Default Value: false

When this option is set to true, the widget text flows from right to left, and the layout of elements is reversed. To switch the entire application/site to the right-to-left representation, assign true to the rtlEnabled field of the object passed to the DevExpress.config(config) method.

JavaScript
DevExpress.config({
    rtlEnabled: true
});
See Also

selectButtonText

The text displayed on the button that opens the file browser.

Type:

String

Default Value: 'Select File'

showFileList

Specifies whether or not the widget displays the list of selected files.

Type:

Boolean

Default Value: true

tabIndex

Specifies the number of the element when the Tab key is used for navigating.

Type:

Number

Default Value: 0

The value of this option will be passed to the tabindex attribute of the HTML element that underlies the widget.

uploadButtonText

The text displayed on the button that starts uploading.

Type:

String

Default Value: 'Upload'

The option makes sense only if the uploadMode option is set to "useButtons" or "instantly".

uploadedMessage

The message displayed by the widget when uploading is finished.

Type:

String

Default Value: 'Uploaded'

The option makes sense only if the uploadMode option is set to "useButtons" or "instantly".

uploadFailedMessage

The message displayed by the widget on uploading failure.

Type:

String

Default Value: 'Upload failed'

The option makes sense only if the uploadMode option is set to "useButtons" or "instantly".

uploadHeaders

Specifies headers for the upload request.

Type:

Object

Default Value: {}

uploadMethod

Specifies the method for the upload request.

Type:

String

Default Value: 'POST'
Accepted Values: 'POST' | 'PUT'

The option makes sense only if the uploadMode option is set to "useButtons" or "instantly".

Use the UploadHttpMethod enum to specify this option when the widget is used as an ASP.NET MVC Control. This enum accepts the following values: POST and PUT.

uploadMode

Specifies how the widget uploads files.

Type:

String

Default Value: 'instantly'
Accepted Values: 'instantly' | 'useButtons' | 'useForm'

The option accepts the following values.

  • instantly
    Starts uploading instantly as files are selected.

  • useButtons
    Starts uploading when a user clicks the "Upload" button.

  • useForm
    Uploads the specified files when the submit button of the current form is clicked. In this case, the FileUploader widget should be enclosed in the form element.

Use the FileUploadMode enum to specify this option when the widget is used as an ASP.NET MVC Control. This enum accepts the following values: Instantly, UseButtons, and UseForm.

View Demo

uploadUrl

Specifies a target Url for the upload request.

Type:

String

Default Value: '/'

The option makes sense only if the uploadMode option is set to "useButtons" or "instantly".

validationError

Specifies information on the validation error when using a custom validation engine. Should be changed at runtime along with the isValid option.

Type:

Object

Default Value: undefined

value

Specifies a File instance representing the selected file. Read-only when uploadMode is "useForm".

Type:

Array<File>

Default Value: []

visible

Specifies whether the widget is visible.

Type:

Boolean

Default Value: true

width

Specifies the widget's width.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The widget's width.

Default Value: undefined

This option accepts a value of one of the following types:

  • Number
    The width in pixels.

  • String
    A CSS-accepted measurement of width. For example, "55px", "80%", "auto", "inherit".

  • Function
    A function returning either of the above. For example:

    JavaScript
    width: function() {
        return window.innerWidth / 1.5;
    }