Jogai commented on issue #21200:
URL: https://github.com/apache/echarts/issues/21200#issuecomment-4612800319
Hitting this too on **6.0.0 and 6.1.0**. A few extra signals that might help
narrow down where it goes wrong, since the existing repro already shows the
symptom:
**It's `setTheme` itself, not the framework around it.** Calling
`chart.setTheme('dark')` directly on an instance that already has data is
enough to break it — no Vue/React/wrapper involved. After the call, the
populated series come back empty: data points go `null` and at least one whole
series disappears from `getOption().series`.
**The option still holds the data.** Immediately re-applying the same option
with `{ notMerge: true }` after `setTheme` restores every series and data
point. So `setTheme` isn't dropping the option you passed — the internal update
it triggers is discarding the already-built series.
**A layout warning fires synchronously during the call:**
```
[ECharts] Can't get DOM width or height. Please check dom.clientWidth and
dom.clientHeight. They should not be 0.
```
The container is a normal, non-zero size before and after, so this looks
like the update pass kicked off by `setTheme` runs against a
zero-size/!prepared state and throws away the series geometry.
**Where to look:** `ECharts.prototype.setTheme` → `prepare(this)` +
`updateMethods.update.call(this, { type: 'setTheme' })`. The `type: 'setTheme'`
update path is where things go off the rails.
Observed with the **SVG renderer**; I didn't bisect canvas vs svg, so can't
say whether it's renderer-specific.
Workaround for anyone blocked: re-init the instance on theme change (dispose
+ `init`) instead of calling `setTheme`, or re-apply the option with `notMerge:
true` right after.
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