fix: Markline causes type error when used with series.encode

[mikkurogue]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fixes a type error that causes ordinalMeta to be undefined when used on encoded axes with series.encode.

Fixed issues

Details

Before: What was the problem?

When defining a markline within a series that uses the series.encode option, a type error would be thrown that ordinalMeta is undefined. It seems like due to this axis encoding, the series can not figure out the correct dimension to use for a markline. I feel its the same for markarea too.

After: How does it behave after the fixing?

In the initial case reported in issue #21300 I used the broken example as input and created a test html file to render the chart, and I noticed the marklines appearing again without needing to use a workaround of an empty/invisible scatter series.

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

test/markLine-dataset-encode-fix.html
test/ut/spec/component/marker.test.ts

Merging options

• Please squash the commits into a single one when merging.

Other information

If anything needs to be changed or updated, please let me know. This is a bug affecting my workplace too so I felt I'd follow the ffmpeg motto of "Talk is cheap, send patches".

Thanks.

[echarts-bot]

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[maeln]

This affect our usage of EChart so this fix is very much appreciated 🙏 .

[Copilot]

Pull request overview

This pull request fixes a bug where using markLine, markPoint, or markArea with series.encode causes a type error due to undefined ordinalMeta. The fix adds proper fallback handling when dimension info is incomplete or undefined in dataset scenarios with encoding.

Key Changes

• Added null checks and fallback creation of SeriesDimensionDefine when getDimensionInfo returns undefined
• Added comprehensive test coverage for all three marker types with dataset and encode
• Included visual test file for manual verification

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/component/marker/MarkLineView.ts	Fixed undefined dimension info handling by creating fallback SeriesDimensionDefine
src/component/marker/MarkPointView.ts	Fixed undefined dimension info handling by creating fallback SeriesDimensionDefine
src/component/marker/MarkAreaView.ts	Fixed undefined dimension info handling by creating fallback SeriesDimensionDefine
test/ut/spec/component/marker.test.ts	Added unit tests for markLine, markPoint, and markArea with dataset and encode
test/markLine-dataset-encode-fix.html	Added manual test for visual verification of the fix

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