D3JS Interactive Bar Chart Part 3 (Data Drill Down)

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D3JS Interactive Bar Chart Part 3 (Data Drill Down)

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Last edited Aug 16, 2017

Created on Mar 31, 2018

This interactive D3.js bar chart demonstrates data drill-down, allowing users to explore hierarchical data by clicking or hovering on bars to reveal more detailed subcategories. The visualization uses D3 v2’s `d3.scale.ordinal()` for x-axis positioning and `d3.svg.axis()` for rendered axes, with SVG rectangles representing aggregated totals. The code includes jQuery for DOM manipulation and supports both level-0 (top-level) and level-1 (drilled-down) views, mapping caption labels to tick marks. The chart updates dynamically with mouseenter/leave events that alter bar dimensions and styling. Rendering relies on SVG elements, with margins and computed width/height determining the plot area.

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