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Getting started with hTWOo UI: No-framework SPFx web part

I am pretty excited on the last weeks launch of hTWOo. It is time to show you how to get started in the most simple possible way and how to add a simple themed button to your web part.

Install hTWOo UI

To add hTWOo to your project install the following package:

npm install --save-dev @n8d/htwoo-core

Now you are ready to add it to your web part.

Modify the manifest to enable theme variants

Edit your web part manifest and add the following code.

  "requiresCustomScript": false,
  "supportedHosts": ["SharePointWebPart"],
  "supportsThemeVariants": true,
  // ...

The property supportThemeVariants make sure that you can use any of the hTWOo components in colored SharePoint section.

Implement the Theme JSON to CSS variable conversion

Add references to SPFx ThemeProvider

To use different SharePoint themes add the following references to your web part code where the React components gets loaded.

import {
} from '@microsoft/sp-component-base';

Init an retrieve the Theme

To retrieve the current theme color slots add the following code in your web part base class.

  private _themeProvider: ThemeProvider;
  private _themeVariant: IReadonlyTheme | undefined;

  protected onInit(): Promise<void> {
    // Consume the new ThemeProvider service
    this._themeProvider = this.context.serviceScope.consume(ThemeProvider.serviceKey);

    // If it exists, get the theme variant
    this._themeVariant = this._themeProvider.tryGetTheme();

    // Assign theme slots
    if (this._themeVariant) {

      // output all theme theme variants
      console.log("LOG Theme variant:::", this._themeVariant);

      // transfer semanticColors into CSS variables

      // transfer fonts into CSS variables

      // transfer color palette into CSS variables

      // transfer color palette into CSS variables

    } else {

      // Fallback to core theme state options applicable for Single Canvas Apps and Microsoft Teams


    // Register a handler to be notified if the theme variant changes
    this._themeProvider.themeChangedEvent.add(this, this._handleThemeChangedEvent);

    return super.onInit();

  // Handle all theme changes
  private _handleThemeChangedEvent(args: ThemeChangedEventArgs): void {
    this._themeVariant = args.theme;

  /// Converts JSON Theme Slots it CSS variables
  private setCSSVariables(theming: any) {

    // request all key defined in theming
    let themingKeys = Object.keys(theming);
    // if we have the key
    if (themingKeys !== null) {
      // loop over it
      themingKeys.forEach(key => {
        // add CSS variable to style property of the web part`--${key}`, theming[key])




This code will convert all theme available color to CSS variables.


SharePoint frameworks use a tool named CSS Modules to give the web part styles a unique naming convention. To avoid bleeding out the hTWOo style to the rest of the page only one container class is needed.

Using the CSS Modules own definition all external style can be include in a fake pseudo class named :global.

Go to the web part and remove all it#s existing code and add a reference to hTWOo instead.This reduce the complete style sheet to the following code.

.hTwOoSample {


The hTWOoSample will still get replaces with a custom string like this.

  /* this where the content goes */

First import the base elements from hTWOo core.

@import 'node_modules/@n8d/htwoo-core/lib/components/base';



From there you can use now all other comments in the main block of your web part using globals. The full list of features may look like this.

  // Imports all base mixin
  @import 'node_modules/@n8d/htwoo-core/lib/components/base';

  .hTWOoSample {

    :global {

      // For Avatar and Person selector components
      @import 'node_modules/@n8d/htwoo-core/lib/components/avatar';

      // Various types of buttons
      @import 'node_modules/@n8d/htwoo-core/lib/components/button';

      // Various types of cards
      @import 'node_modules/@n8d/htwoo-core/lib/components/cards';

      // Various types of dialogs
      @import 'node_modules/@n8d/htwoo-core/lib/components/dialogs';

      // Various types of forms
      @import 'node_modules/@n8d/htwoo-core/lib/components/forms';

      // Various types of icons controls
      @import 'node_modules/@n8d/htwoo-core/lib/components/icon';

      // Various types of menus controls
      @import 'node_modules/@n8d/htwoo-core/lib/components/menus';

      // Various types of tables
      @import 'node_modules/@n8d/htwoo-core/lib/components/table';

      // Various types of typography
      @import 'node_modules/@n8d/htwoo-core/lib/components/typography';

      // Various types of web part utilities
      @import 'node_modules/@n8d/htwoo-core/lib/components/webparts';


Just include what you are actually using.

Use a simple button in your web part

In the render method of your file you can now add a simple button.

  public render(): void {
    this.domElement.innerHTML = `
      <div class="${styles.hTWOoSample}">
        <button class="hoo-button">
          <div class="hoo-button-label">My First H2O button</div>

This should give you the following result in your browser.

Primary button on the web part

You can now add additional functionalities and other buttons to your code or just simply change it to a primary button by toggle only the style sheet class from .hoo-button to .hoo-primary.

A complete reference of all components can be found in the style guide.

hTWOo and theming

The way hTWOo handles theming and theme slots also allow you to change the theme without any extra effort and coding.

If you change the background to inverted for example, the colors will get automatically adjusted once the page has been saved.

SPFx themed standard and primary button

Or even an overall dark page theme work.

Dark theming with standard and primary button

Download this getting started

The hTWOo Style Guide shows you the complete supported patterns.
This sample is also available on the hTWOo Samples Repo.

Further resources

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