index.md

---

title: generate-id
slug: Web/XPath/Functions/generate-id

---

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The generate-id function generates a unique id for the first node in a given node-set and returns a string containing that id.

Syntax

generate-id( [node-set] )

Arguments

• node-set (optional)

  • : An id will be generated for the first node in this node-set. If omitted, the current context node will be used.

Returns

A string containing the generated id.

Notes

• The same id must be generated every time for the same node in the current document in the current transformation.

• The generated id may not be the same in subsequent transformations.

This function is an XSLT-specific addition to XPath. It is not a part of the core XPath function library.

Defined

XSLT 1.0 12.4

Gecko support

Supported.