Gist 7330771

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Last edited Oct 12, 2012

Created on Nov 6, 2013

This example demonstrates how D3 transitions make data joins easier to follow by animating the entry, update, and exit states of SVG text elements. It shows a sequence of randomly selected alphabet letters that change every 1.5 seconds, with entering letters sliding down from above, exiting letters dropping below, and updated letters gliding horizontally to their new positions. The code uses D3’s selection joins with key functions, `transition.attr` and `transition.style` to animate positions and opacity, and relies on SVG text elements rendered in a single group. The data is a shuffled subset of the alphabet, sorted and re-joined with each interval.

AI-generated description

By adding transitions, we can more easily follow the elements as they are entered, updated and exited. Separate transitions are defined for each of the three states.

Note that no transition is applied to the merged enter + update selection; this is because it would supersede the transition already scheduled on entering and updating elements. It's possible to schedule concurrent elements by using transition.transition or by setting transition.id, but it's simpler here to only transition the x-position on update; for entering elements, the x-position is assigned statically.

Want to read more? Try these tutorials:

See the D3 wiki for even more resources.

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