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This example shows a simple CSV file summary interface that fetches a remote dataset and displays its basic properties—file size, row count, and column count—in a styled card. It uses the Fetch API to retrieve the CSV from a GitHub raw link, then parses it with `d3.csvParse` to determine the number of rows and columns. The summary text is injected into the DOM via `innerHTML`, and a helper function formats the file size using logarithmic scaling. The page relies on D3.js v6 for parsing and basic DOM manipulation, with no charting or visualization beyond textual metadata.
AI-generated descriptionA blank slate starting point showing the "Hello World" for the VizHub V3 Runtime Environment, which supports continuous hot reloading with interactive widgets.
- There is no
index.html- that's what triggers the V3 Runtime - The entry point is the
mainfunction exported fromindex.js - The
mainfunction takes an argumentcontainer, a DIV that has measurable dimensions usingclientWidthandclientHeight - The second argument to
mainis an options object containingstateandsetState. - The state of the application is stored in
state, which is initialized as an empty object{}. - The
setStatefunction can be called with a function that uses the previous state to create a new state object using immutable update patterns. - For an interactive example, see Mouse Follower.
Full course playlist: YouTube: Constructing Visualization 2024.