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d3.js: show tooltip in absolutely positioned DIV, which position is calculated taking screen size+scroll into consideration

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GGerHobbelt
Last edited Sep 10, 2012
Created on Apr 27, 2012

This example demonstrates a d3.js treemap that displays a tooltip in an absolutely positioned DIV, with its placement calculated according to the current screen size and scroll position. The treemap renders hierarchical JSON data as colored SVG rectangles with text labels. On mousemove, the code uses d3.mouse and custom position calculations to determine whether to align the tooltip to the left or right and top or bottom of the cursor, ensuring it stays visible within the viewport. The tooltip’s visibility toggles on mouseout. The implementation relies on d3.layout.treemap and manual DOM offset tracking.

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