Filtering in v4

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Filtering in v4

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Last edited Aug 14, 2016

Created on Aug 14, 2016

This example demonstrates filtering in d3.js v4 by showing a line chart of stock closing prices over time, with red dots highlighting only the data points where the closing price falls below 400. The visualization pairs a steelblue line with scatterplot circles, using the `filter` method on the circle selection to exclude points above the threshold. It loads data from a CSV file, parses dates with `d3.timeParse`, and renders both an SVG line and axis through `d3.axisBottom` and `d3.axisLeft`. The code relies on d3.v4’s scale functions (`d3.scaleTime`, `d3.scaleLinear`) and the `d3.line` generator.

AI-generated description

This is a simple graph demonstrating filtering. Specifically filtering graph points that fall below 400. This was written using d3.js v4 and is a follow on to the simple scatter plot example here.

This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.

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