Interactive Graphing in Elixir with Vegalite and Phoenix LiveView

The article provides a practical guide on integrating Vegalite, an Elixir library, with Phoenix LiveView to draw interactive graphs that update in real-time. It starts by explaining how to set up a new LiveView component to prepare the data for graph visualization and goes on to describe creating the graphic specification with Vegalite. The key steps involve mapping data to X and Y axis, defining metadata, choosing the type of graph, and constructing the Vega spec. Next, the article details the JavaScript side—using Vega-Embed to hook into the LiveView component for rendering the graph. The final touch involves ensuring the graph can update automatically as new data arrives, for which the author hooks into an existing PubSub system. By the end of the article, readers should understand how to create and update graphs with data flowing from Elixir to JavaScript.