README.md

Tooltip for Vega & Vega-Lite

A tooltip plugin for Vega and Vega-Lite visualizations. This plugin implements a custom tooltip handler for Vega that uses custom HTML tooltips instead of the HTML title attribute. Vega Tooltip is installed in the Vega Editor.

Features

• Renders nice tooltips for Vega and Vega-Lite charts
• Supports dark and light theme
• Renders object-valued tooltips as a table
• Supports special keys title (becomes the title of the tooltip) and image (used as the url for an embedded image)

Demo

http://vega.github.io/vega-tooltip/

Installing

We recommend using Vega-Embed, which already comes with this tooltip plugin.

You can install Vega tooltip directly with npm install vega-tooltip.

Using Vega-tooltip with a CDN

You can import vega-tooltip directly from jsDelivr. Replace [VERSION] with the version that you want to use.

<!-- Import Vega 5 & Vega-Lite 4 (does not have to be from CDN) -->
<script src="https://cdn.jsdelivr.net/npm/vega@5"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-lite@4"></script>

<script src="https://cdn.jsdelivr.net/npm/vega-tooltip@[VERSION]"></script>

Usage and APIs

If you use Vega-Embed, you don't need to install Vega Tooltip! Vega Embed already comes with Vega Tooltip. You can however pass tooltip customizations.

vegaEmbed("#vis", spec, {tooltip: {theme: 'dark'}})
  .then(function(result) {
    // result.view contains the Vega view
  })
  .catch(console.error);

If you want to use a different version of the tooltip handler, you can override the default handler with the handler from Vega Tooltip (and you need to install it separately).

var handler = new vegaTooltip.Handler();
vegaEmbed("#vis", spec, {tooltip: handler.call})
  .then(function(result) {
    // result.view contains the Vega view
  })
  .catch(console.error);

See the API documentation for details.

Tutorials

1. Creating Your Tooltip
2. Customizing Your Tooltip

Run Instructions

1. In the project folder vega-tooltip, type command npm i to install dependencies.
2. Then, type npm run start. This will build the library and start a web server.
3. In your browser, navigate to http://localhost:8000/, where you can see various Vega-Lite and Vega visualizations with tooltip interaction.

Publishing

To make a release, run npm run release. The update the website with npm run deploy:gh.