D3: Drawing a Bar Chart

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D3: Drawing a Bar Chart

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Last edited Sep 26, 2022

Created on Sep 26, 2022

This example demonstrates a basic bar chart built with D3 v7 in an SVG container, visualizing an array of 20 numeric values. The bars grow downward from the top of a 500×100 pixel canvas, with each bar’s height proportional to its data value multiplied by 4, and its fill color transitioning from dark to lighter blue based on the data. The chart also overlays each bar with white, 11px sans-serif text labels showing the exact data values, centered horizontally within each bar. The code uses `d3.select` to append SVG elements and the data-join pattern with `.enter()` to create rectangles and text nodes.

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A bare minimum HTML page demonstrating use of CSS and JavaScript.

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