[GitHub] [incubator-echarts] 100pah commented on issue #11098: dataZoom won't update its status when min/max of xAxis are changed.

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100pah commented on issue #11098: dataZoom won't update its status when min/max of xAxis are changed.
URL: https://github.com/apache/incubator-echarts/issues/11098#issuecomment-546018395
 
 
   Hi @catscarlet  ,
   I have made some change to your example:
   https://gallery.echartsjs.com/editor.html?c=xync4-wJe&v=2
   
   I think it probably meet your requirement.
   
   The change is: do not specify `dataZoom.startValue` and `dataZoom.endValue` manually, but always specify `xAxis.min`, `xAxis.max`. 
   
   @yufeng04 I think it is not a bug but a feature by design, if I haven't missed something.
   
   There are two mode of dataZoom, auto determined by [dataZoom.rangeMode](https://www.echartsjs.com/en/option.html#dataZoom-inside.rangeMode):
   
   + `'value'`: If we set `dataZoom.startValue` or `dataZoom.endValue`, it will be in `'value'` mode, where the extent of xAxis will be always the `dataZoom.startValue` and `dataZoom.endValue` if we don't change it, as what @catscarlet 's example looks like in its initial state.
   + `'percent'`: By default `dataZoom` is in `'percent'` mode, where `100%` represents 100% of `[xAxis.min, xAxis.max]`, which is what we want. And why in @catscarlet 's example after we scroll mouse it become normal? because when scrolling mouse it triggers `insde dataZoom` and it auto shift to `'percent'` mode.
   

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