Stable calculation of active toc #1456
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IntersectionObserver only notifies changed intersections. We need to track which heading tag currently intersects with viewport. Use the top-most intersecting heading to make user-clicked toc links match with active toc links.
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kou
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Nov 18, 2025
| return intersectingHeadings.has(heading); | ||
| }); | ||
| if (!firstIntersectingHeading) return; | ||
| var correspondingLink = document.querySelector('.toc-link[data-target="' + firstIntersectingHeading.id + '"]'); |
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This may be simpler:
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| var correspondingLink = document.querySelector('.toc-link[data-target="' + firstIntersectingHeading.id + '"]'); | |
| var correspondingLink = document.querySelector(`.toc-link[data-target="${firstIntersectingHeading.id}"]`); |
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I want to keep it for now.
Currently this file doesn't use ES6 feature: const let ()=>{} and `${}`
I think we can use newer syntaxes, but I think it's better to do it in a separate pull request.
Remove assignment to unused variable Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
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Fix this unstable active table-of-contents link calculation shown in this video:
Clicking "Plugin types", active toc link will be "Option Parsing" or "File Parsing", depend on previous scroll position.
https://github.com/user-attachments/assets/bfd5c92a-9f11-4c9b-9267-86ae55607541
IntersectionObserver only notifies changed intersections.
We need to track which heading tag currently intersects with viewport. (I use Set in this pull request)
Use the top-most intersecting heading to make user-clicked toc links match with active toc links.