Customizing the File Browser

Applying Custom Themes

You can easily apply a custom theme to the File Browser by utilizing Office UI Fabric's Customizer component. The following walk through covers applying a theme to the GraphFileBrowser using Customizer:

  1. In your React app, import Customizer from office-ui-fabric-react/lib/Utilities and ITheme from office-ui-fabric/lib/Styling.
  2. Create a custom ITheme and pass it to the settings prop of Customizer. You can use Office UI Fabric's Theme Generator to create a custom palette.
  3. Wrap the GraphFileBrowser component with the Customizer component to see your custom theme applied.

Below is a code sample after completing the above steps:

import * as React from 'react';
import * as ReactDOM from 'react-dom';

import { GraphFileBrowser } from '@microsoft/file-browser';
import { Customizer } from 'office-ui-fabric-react/lib/Utilities';
import { createTheme, ITheme } from 'office-ui-fabric-react/lib/Styling';

export const theme = createTheme({
  palette: {
    themePrimary: '#6264a7',
    themeLighterAlt: '#f7f7fb',
    themeLighter: '#e1e1f1',
    themeLight: '#c8c9e4',
    themeTertiary: '#989ac9',
    themeSecondary: '#7173b0',
    themeDarkAlt: '#585a95',
    themeDark: '#4a4c7e',
    themeDarker: '#37385d',
    neutralLighterAlt: '#f8f8f8',
    neutralLighter: '#f4f4f4',
    neutralLight: '#eaeaea',
    neutralQuaternaryAlt: '#dadada',
    neutralQuaternary: '#d0d0d0',
    neutralTertiaryAlt: '#c8c8c8',
    neutralTertiary: '#c2c2c2',
    neutralSecondary: '#858585',
    neutralPrimaryAlt: '#4b4b4b',
    neutralPrimary: '#333',
    neutralDark: '#272727',
    black: '#1d1d1d',
    white: '#fff'
  semanticColors: {
    bodyBackground: '#fff',
    bodyText: '#333'

class App extends React.Component {
  getAuthenticationToken() {
    return Promise.resolve('<access_token>');

  render() {
    return (
        settings={ { theme } }>
            getAuthenticationToken={this.getAuthenticationToken} />

  <App />,

Render Custom Action Buttons

To support advanced scenarios, the File Browser SDK exposes React Component props for customizing its "Select" and "Cancel" action buttons. By default, the GraphFileBrowser component renders "Select" and "Cancel" buttons in the footer. Each button has a corresponding function for providing a custom element to render in place of the default button. These are named onRenderSuccessButton and onRenderCancelButton respectively.

  * Custom render function for the "Success" action button.
onRenderSuccessButton?: IRenderFunction<IButtonProps>;
  * Custom render function for the "Cancel" action button.
onRenderCancelButton?: IRenderFunction<IButtonProps>;

Both onRenderSuccessButton and onRenderCancelButton props are of type IRenderFunction from office-ui-fabric-react. This type accepts component props and invokes an optional rendering function with the props as its only argument. In the case of the action buttons, the GraphFileBrowser's default action button props of type IButtonProps are passed in. The developer is then free to apply those props on and return a valid JSX.Element however they wish.

This walk through covers customizing both the text and style of the action buttons.

Custom Button Text

The above mentioned render functions allow for complete customization of the action buttons. For example, you may customize the text of the controls while retaining the remaining default props by using the following implementations:

class App extends React.Component {
  public render() {
    return (
        onRenderCancelButton={this.onRenderCancelButton} />

  private getAuthenticationToken() {
    return Promise.resolve('<access_token>');

  private onRenderSuccessButton(props) {
    return <PrimaryButton {...props} text="Ok" />

  private onRenderCancelButton(props) {
    return <DefaultButton {...props} text="Discard" />

This replaces the text to be "Ok" and "Discard" for the "Select" and "Cancel" buttons for the GraphFileBrowser component.

Custom Button Styles

By using IRenderFunction<IButtonProps>, a developer may customize the File Browser buttons beyond changing their text values. For example, custom styles can be applied per button by overriding the styles for default, hovered, and pressed states.

Building off of the above customized "Select" button, let's apply a custom background-color in default, hovered, and pressed states. Since we're rendering an office-ui-fabric-react Button, we can style a PrimaryButton component using the library's styles approach covered in this Wiki entry.

private onRenderSuccessButton(props) {
  const styles = {
    root: {
      backgroundColor: '#5c2d91'
    rootHovered: {
      backgroundColor: '#6b3e9f'
    rootPressed: {
      backgroundColor: '#32145a'

  return <PrimaryButton {...props} text="Ok" styles={styles} />

After applying the above changes, refresh your application to see the "Ok" button rendered with a custom set of colors for its background-color when in hovered, pressed, and default states.