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Add Custom Styles and Components for UI5 Web Components for React

Beginner
10 min.
HTML5, Beginner, SAP Fiori, Tutorial
Add custom styles and custom components to your application using UI5 Web Components for React.
You will learn
  • How to change style of existing components
  • How to style own components
Lukas742Lukas HarbarthFebruary 1, 2023
Created by
Lukas742
December 5, 2019
Contributors
Lukas742
maximilianone
thecodester

In this tutorial, you will learn how to apply styling to the UI5 Web Components. You can add custom styles and even overwrite CSS Variables on any level. Also you’ll learn how to style your custom components with the styling approach of SAP Fiori

  • Step 1

    You can change the appearance of the UI5 Web Components by using CSS Variables.
    Per default, the Fiori 3 theme parameters are injected as CSS Variables into the <head>.
    For example, if you want to change the color of all texts that use the --sapTile_TitleTextColor variable, you can create an additional style tag in the head of your application:

    Open the index.html file inside your public folder and add the following content inside the <head> element:

    HTML
    Copy
      <style>
    * {
      --sapTile_TitleTextColor: limegreen;
    }
  </style>

    The sapTile_TitleTextColor CSS Variable changes the style of the Card titles and the * selector appends the style to all elements.

    Custom Style

    As a consequence, all HTML Elements in the subtree where this style was applied are now displaying their texts in limegreen instead of #6a6d70 which would be the default value for Fiori 3. You can change CSS Variables on any level - in the head, or on every single element by using either CSS classes or element style.

    A full list of all supported CSS Variables can be found in the ThemingParameters.

    Warning: Overriding the value of CSS variables changes it for all themes and therefore can cause inconsistencies.

  • Step 2

    If you want to add a custom component to your app, but still want to use the styling approach of the UI5 Web Components, you can import the ThemingParameters that contain the various CSS variables used in our theming. If you want to style your components with the react-jss syntax, you can use the custom jss styling hook createUseStyles.

    1. Create a custom component MyCustomElement.jsx under ./src with following content:
      JavaScript / JSX
      Copy
      import React from "react";
import { createUseStyles } from 'react-jss';
import { ThemingParameters } from "@ui5/webcomponents-react-base";

export const MyCustomElement = () => {
  return (
    <div >
      <span>My custom Text Element</span>
    </div>
  );
};
    2. Add inline-styles with the ThemingParameters to the <span>
      JavaScript / JSX
      Copy
      <span style={{ color: ThemingParameters.sapNegativeColor, fontSize: ThemingParameters.sapFontHeader1Size }}>
  My custom Text Element
</span>

      The ThemingParameters contain all available styling parameters. With this it is possible to style custom components with the standardized styles of the UI5 Web Components.

    3. Add styling with react-jss and the createUseStyles hook

      JavaScript / JSX
      Copy
      import React from "react";
import { createUseStyles } from 'react-jss';
import { ThemingParameters } from "@ui5/webcomponents-react-base";

const styles = {
  container: {
    backgroundColor: ThemingParameters.sapBackgroundColor,
    fontFamily: ThemingParameters.sapFontFamily,
    height: "50px",
    display: "flex",
    justifyContent: "center",
    alignItems: "center",
  }
};

const useStyles = createUseStyles(styles);

export const MyCustomElement = () => {
  const classes = useStyles();

  return (
    <div className={classes.container}>
      <span style={{ color: ThemingParameters.sapNegativeColor, fontSize: ThemingParameters.sapFontHeader1Size }}>
        My custom Text Element
      </span>
    </div>
  );
};

    4. Import the custom component and add it to your Home component.

      JavaScript / JSX
      Copy
      import { MyCustomElement } from "./MyCustomElement";
      JavaScript / JSX
      Copy
       return (
    <FlexBox
      justifyContent={FlexBoxJustifyContent.Center}
      wrap={FlexBoxWrap.Wrap}
    >
      <MyCustomElement />
   ...
      Custom Element

    Now you can see, that the element has the same fontFamily and uses the same semantic colors as the UI5 Web Components for React.

    Where can you access all standardized CSS Variables of the UI5 Web Components for React

  • Step 3

    In this tutorial mission, you learned the basics of how to build a single page application using UI5 Web Components for React, with routing, styling, and general component behavior and modern React APIs.
    If you have questions about UI5 Web Components for React, or found something that isn’t right, then please feel free to join the OpenUI5 Slack community and visit us in the #webcomponents-react channel, or come directly to our GitHub page, where you can file issues or participate in discussions.

    If you enjoyed this tutorial, you can help us out a lot by starring our repo and become one of our wonderful stargazers!

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