D3 Line - handling null values with .defined()

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D3 Line - handling null values with .defined()

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Last edited Dec 29, 2023

Created on Dec 29, 2023

This example demonstrates how to handle null values in a line chart using D3’s `d3.line()` generator with a `.defined()` filter. The chart renders a single polyline across an SVG canvas, where a missing data point (null) breaks the continuous path into two segments, leaving a gap in the visualization. The code constructs the path data by passing an array of coordinate pairs—including a null entry—to the line generator, then appends the resulting path to the SVG via `d3.select()` and `.attr('d', pathData)`. The stroke is set to a light gray (#ccc) with no fill, and the feature is powered by D3 v7.8.5.

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