# r

## Function clientId

- Signature:
    `java.lang.String clientId(java.lang.String)`
  Description:
    The r:clientId('id') function returns the client identifier related to the passed component identifier ('id'). If the specified component identifier is not found, null is returned instead.

- Function Information
  Info | Value
  --- | ---
  Function Class | `org.richfaces.ui.misc.RichFunction`
  Function Signature | `java.lang.String clientId(java.lang.String)`
  Display Name | None

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