Brush (lineX, lineY) selection values are not available with line charts

[tamersalama]

Version

5.0.2

Reproduction link

https://codepen.io/tamersalama/pen/mdOraGb?editors=1111

Steps to reproduce

1- Create a line chart with a horizontal selector (lineX) brush

2- Use the brush to select a data range

3- The onbrushselected event fires up normally, however the event parameters' dataIndex (params.batch[0].selected[0].dataIndex) returns an empty array

4- Changing the chart type to scatter or bar will result in a proper dataIndex being returned

What is expected?

It's expected that the dataIndex for the selection to have an array of selected values

What is actually happening?

dataIndex within params.batch[0].selected[0].dataIndex is empty

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[tamersalama]

Thank you for adding this a milestone.

As a workaround (in case anyone encountered the same issue) - I'm using params.areas[0].coordRange to get the selected range. Not perfect but could work is some cases.

[lambo-huang]

跟你一样的需求，你解决了吗

[pramitchoudhary]

Thanks for the above trick @tamersalama Also, brushSelected event doesn't seem to be documented. Will it be possible to add an entry for that in the docs?

[coolRoger]

really need this feature for line chart

@Ovilia

[novablinkicelance]

Any news on this feature?

[Ovilia]

As the document states:

Currently, supported brush types include: scatter, bar, candlestick.

If you are interested in making this feature, please open a pull request.

[howdyhyber]

Is this still considered on the pipeline? this is a good feature if added.

[wanghaiqiangk]

Thank you for adding this a milestone.

As a workaround (in case anyone encountered the same issue) - I'm using params.areas[0].coordRange to get the selected range. Not perfect but could work is some cases.

Thanks. Although this trick is very limited, it does help in my situation. My xAxis is a time type. I want to use brush to select an area and calculate its duration. In such case, the coordRange is enough to do the calculation. But you need to change brush option from global to specific coordinate with brush. xAxisIndex.

And, please consider to implement this feature, team :+1:

[Franck92700]

Hi, No fixe for this issue ?

Franck

[alxnddr]

Hey @Ovilia, I've created a fix for this. Could you please have a look? https://github.com/apache/echarts/pull/19193

[Ovilia]

@alxnddr Hi, I've commented on the PR. Please have a look. Thanks!