Add option for Axis Pointer to ignore NULLs

[tmtron]

What problem does this feature solve?

When we use a line series and set connectNulls=false the NULL data samples will not be visible, but the axis-pointer will still snap to the (invisible) point and also the tooltip will show up.

Stackblitz example

This is confusing for some or our users: it would be good to have an option to deactivate this.

What does the proposed API look like?

maybe add:

• axisPointer.ignoreNulls (boolean), default=false (for backward compatibility): when true, the Axis Pointer should ignore NULLS (and thus also the tooltip will not be shown)

[echarts-bot[bot]]

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[Ovilia]

Update: The problem beneath has been fixed in https://github.com/apache/echarts/pull/15313

---

Another related problem is that if tooltip.formatter is defined and returns null for null data, the previous data value is used, which is even more confusing.

formatter: function(param) {
      return param[0].value[1] == null ? null : 'value: ' + param[0].value[1];
}

[echarts-bot[bot]]

This issue is labeled with difficulty: easy. @tmtron Would you like to debug it by yourself? This is a quicker way to get your problem fixed. Or you may wait for the community to fix.

Please have a look at How to debug ECharts if you'd like to give a try. 🤓

[DaveMDS]

Hi, we are facing the same issue as described by @tmtron: serie.connectNulls is set to false and lines correctly doesn't show when null values are present, but axisPointer and tolltip still show up for null values. quite confusing for the user.

Also we are building a chart with multiple lines using dataset, an thus the axisPointer and the tooltip should not show up when ALL values for that time point are nulls.

This issue is really a show-stopper issue for us, any help will be much appreciated!

[fplusf]

any updates on this issue?

[nepton]

I got the same issue