Simplify usage of selection.join with transitions#286
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curran
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This was referenced May 25, 2021
mbostock
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May 25, 2021
src/selection/join.js
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| if (onupdate != null) update = onupdate(update); | ||
| if (onexit == null) exit.remove(); else onexit(exit); | ||
| return enter && update ? enter.merge(update).order() : update; | ||
| return enter && update ? enter.selection().merge(update.selection()).order() : update; |
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I think we should do this earlier so that selection.join is guaranteed to return a selection, like so:
function(onenter, onupdate, onexit) {
var enter = this.enter(), update = this, exit = this.exit();
if (typeof onenter === "function") {
enter = onenter(enter);
if (enter) enter = enter.selection();
} else {
enter = enter.append(onenter + "");
}
if (onupdate != null) {
update = onupdate(update);
if (update) update = update.selection();
}
if (onexit == null) exit.remove(); else onexit(exit);
return enter && update ? enter.merge(update).order() : update;
}
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Oh yes good catch! Thank you.
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Remaining work:
|
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curran
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No, you’ll still want it because otherwise selection.join could return a transition if there’s no enter selection: return enter && update ? enter.merge(update).order() : update; |
curran
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Added tests and docs. Ready for review. Thanks! |
curran
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Hooray! Thank you @mbostock 🙏 |
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Related to #257, an alternative to #285, this change would allow
.jointo handle the case that transitions are returned byonenterand/oronupdate. It would support the same simplified usage documented in #257, but leave the behavior of.mergeunchanged. Just putting this out there as an alternative to consider, as it targets the main pain point, rather than introducing new behavior in.mergeto accomplish the same goal.This works because of selection.selection.