How to Create an SVG Bar Chart — Pure SVG and D3.js Guide
SVG bar charts use <rect> elements scaled to data values — build with pure SVG math or let D3.js handle the data binding.
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Pure SVG Bar Chart Structure
A bar chart uses `<rect>` elements with height proportional to the data value. Calculate `height = value / maxValue * chartHeight`. Position from the bottom: `y = chartHeight - barHeight`. Add `<text>` labels below each bar.
- Bar height = (value / max) * chartHeight
- Bar y position = chartHeight - barHeight (SVG y increases downward)
- Add <text> below each bar for category labels
Animated SVG Bar Chart
Animate bars growing from zero by transitioning height from 0 to the target value and y from chartHeight to the calculated y position. Use CSS transitions or D3 transitions on rect elements.
- CSS: rect { transition: height 0.5s ease, y 0.5s ease; }
- JS: set initial height=0, then update to target value
- Stagger animation: add transition-delay per bar index
Frequently Asked Questions
How do I make an SVG bar chart responsive?
Remove fixed width/height from the SVG, add a viewBox, and set CSS width: 100%. Recalculate bar positions based on the SVG's rendered width using ResizeObserver for dynamic scaling.
Can I add tooltips to SVG bar charts?
Yes — add mouseover and mouseout event listeners to each <rect> element. Show a tooltip div with the data value positioned near the cursor using clientX/clientY.
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