tree.tree.columns[].key

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Key into root/link column-value mappings.

This is a compact property lookup. Use the contextual guide below for the complete feature model, configuration sequence, interactions, examples, and limitations.

Context

tree panel

Accepted value

string

Required

Yes

Default

No documented default.

User scenarios

• Map hierarchy data to a display column.

Related parameters

• tree.tree.root.columns
• tree.tree.links[].columns

Contextual guide and evidence

• Contextual guide: Open the complete human guide
• Source: apps/panel/src/types/panel-tree.ts, symbol TreeTableColumn
• Example coverage: Partial — The contextual guide explains the field and its behavior, but no focused example isolates it.
• Demo coverage: Complete — The fixture maps tree columns. Open the runnable demo .

The panel source named above remains authoritative for runtime behavior. This secondary reference page is generated from the reviewed parameter matrix and does not replace the contextual guide.