Orbeon Forms - Find current Document_id

开发者_如何学JAVAI want to have a text box have the current document_id displayed. Is there an XPath expression to get that?

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The following XPath returns the current document id, the same that you see on the URL on the edit page you get by clicking on a form instance in the summary page.

xxforms:instance('fr-parameters-instance')/document

Note however that if you use this in a calculated expression, for new forms, the value won't show until a change was done in the form (e.g. users entered a value in a field).