Tableau Extensions API

Why the Tableau Extensions API?

The Extensions API lets you do more without leaving Tableau. Build Tableau extensions that can interact and communicate with Tableau, and embed them directly in your workbooks.

Setup and Running Samples

Prerequisites

• You must have Node.js and npm installed. You can get these from https://nodejs.org.

Install Extensions API SDK Components and Start Server

1. Open a command prompt window to the location where you cloned this repo.

2. Install the Extensions API SDK components.

   npm install

3. Build the TypeScript samples and install the Extensions API types library.

   npm run build

4. Start the local Dashboard Extension server.

   npm start

5. Launch Tableau and try the sample extensions in a dashboard. The samples are located in the Samples folder.

Note The local web server you start just serves to host the extension samples and extensions used in the tutorial, which have URLs similar to the following: http://localhost:8765/Samples/DataSources/datasources.html or http://localhost:8765/Samples-Typescript/DataSources/datasources.html This local web server is not intended to serve the Extensions API Help pages. View the Help on GitHub at https://tableau.github.io/extensions-api.

Typescript Development

Samples written in Typescript are located in the Samples-Typescript folder. If you want to use TypeScript to write your extensions, you can run a script that starts up the HTTP server and actively listens for changes to the .ts files located in the Samples-Typescript folder. You can then add your extension to the folder and use the script to transpile your extension to JavaScript.

• To start the the HTTP server and listen for changes to the .ts files.

  npm run dev

For more information, see Use TypeScript with the Extensions API.

Sandboxed Extension Development Environment

Tableau is introducing development support for Sandboxed Extensions with Tableau 2019.3. Sandboxed Extensions run in a virtual sandbox and ensure the extension can’t make network calls outside of the hosting Tableau Server. The Extensions API SDK provides a local development environment that replicates the Tableau Hosting Cloud Service for Sandboxed Extensions. You can test your Sandboxed extensions locally with the same sandbox policies.

1. Start the local Sandboxed Extension web server.

   npm run start-sandbox

2. Launch Tableau (Tableau 2019.3 and later) and try the sample Sandboxed Extension in a dashboard. You can find the .trex file and sample code in the Samples\UINamespace-sandboxed folder.

For more information, see Create and Test Sandboxed Extensions.

Contributions

Contributions and improvements by the community are welcomed! See the LICENSE file for current open-source licensing and use information.

Before we can accept pull requests from contributors, we require a signed Contributor License Agreement (CLA). To submit a contribution, please fork the repository then submit a pull request to the main branch.

Code Style

Our sample code follows the Semi-Standard Style for JavaScript samples linting and tslint for TypeScript. If you add your own extension code to the Samples or Samples-Typescript directories, you can run npm run lint to validate the style of your code. Please run this command before submitting any pull requests for Sample code.

npx semistandard --fix to fix linting issues which can be fixed automatically.

Documentation

Visit the project website and read the documentation here.

Issues

Use Issues to log any problems or bugs you encounter in the docs or sample code, or to discuss any proposed changes or additions.