Chained transition with different elements
The example demonstrates a chained transition sequence where three heading elements, labeled "first," "second," and "third," fade out and then back in one after another, each turning green after its second fade-in. The code uses D3 v4’s selection and transition APIs, including `.transition()`, `.duration()`, and `.style()` with an opacity tween, to chain two transitions per element. A custom recursive function, `transitionNext()`, triggers each element’s animation in order, using a filter on the bound data array `[1000, 2000, 3000]` to select the current index, and the `.on("end")` event to advance to the next element. The data source is hardcoded in the selection’s data binding, and rendering is entirely DOM-based via HTML headings.
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