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Creating a custom Carbon add-on component

Complete the following steps to create a Carbon add-on component called componentX and prepare to integrate it into a custom UIM page. The steps do not need to be done in this order, but it is currently the recommended order.

  1. Implement a custom React JavaScript component by completing the following steps:
    • In the custom-carbon-addons package, create a directory for the component in the react directory. For example, custom-carbon-addons/src/react/addons/componentX.
    • Create the JavaScript files for componentX in the directory. To create add-on components that are based on Carbon components, import the Carbon components from the carbon-components node module.
    • You can do your unit tests in parallel to test the generated HTML output from the component.
  2. Implement the look and feel of the component with Sass. Ensure that you follow the Carbon and Cúram design guidance.
    • In the custom-carbon-addon/src/scss/addons directory, create an SCSS file for the component. For example, componentX.scss.
    • Import componentX.scss into the index.scss file.
  3. Implement a query provider in Apollo Client. An Apollo Client query provider enables the cached data from GraphQL to be integrated with a React component. Complete the following steps:
    • Create a directory in the custom-carbon-addon/src/apollo-client-hooks/hooks directory. For example, componentX.
    • Create the JavaScript files for your query provider with reference to the samples in carbon-addons-devenv/src/apollo-client-hooks/hooks/hook_samples. Use the ApolloClientDataProvider, ApolloClientQueryProvider, and ApolloClientHookTemplate React helper components in carbon-addons-devenv/src/apollo-client-hooks/hooks/core to help with this task.
    • Create a query that accesses data from the back-end by importing gql and useQuery from @apollo/client. If you already have a GraphQL query that serves a number of components, you can use that query.
  4. Test the Carbon component in Storybook. To test componentX in storybook, you can test components in isolation before you integrate them into Cúram.
    • In the stories directory of the custom-carbon-addon package, create a directory for the component. For example, custom-carbon-addon/stories/componentX. Run npm run storybook to test components.
  5. Create a JavaScript renderer function. You can use the Renderer.create() helper function to implement a JavaScript Renderer function to integrate the component into a Java Renderer on the UIM page. You can place your renderer functions in the custom-carbon-addon/renderers directory. For example, create theCarbonComponentXViewRenderer function.
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      Docs last updated: 17 October 2025
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