Extending the d3 Axis function

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Extending the d3 Axis function

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Last edited Apr 2, 2015

Created on Apr 2, 2015

This example shows how to extend D3’s built-in axis component to customize tick styling—specifically, highlighting January ticks as bold, black year labels while other months remain gray. The custom `timeAxis` function wraps `d3.svg.axis`, reuses its scale and tick configuration, then reapplies a class to tick elements based on whether the date falls in January. It uses D3 v3 with SVG rendering, and the code includes a custom multi-format date formatter for month and year labels. The axis is drawn on a time scale spanning from July 2010 to April 2012.

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A custom axis function that "extends" the native axis (in this case, highlighting years on a time scale). See this Stack Overflow question.

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