im67 commented on issue #19289:
URL: https://github.com/apache/echarts/issues/19289#issuecomment-2661915669
In the data of the series, the collapsed field controls expansion/collapse.
So a feasible way is to modify the value of the collapsed field in the click
event for expansion/collapse. A simple example is as follows:
```
treeChart.on('click', function (params) {
if (params.componentType === 'series') {
params.data.collapsed = !params.data.collapsed;
}
});
// on Zoom
const onZoom = () => {
const opt = treeChart.getOption();
treeChart.setOption({
series: [
{
zoom: opt.series[0].zoom + 0.1
}
]
})
}
```
then you can see that the expanded/collapsed state is correctly preserved.
As a temporary solution, I hope it can help others
:)
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