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jsf 2 - How at a time one row can expand in <p:dataTable>?

In my application I have a <p:datatable> with rowExpansion column. I have a requirement to open a single row at a time. If anyone tries to expand second row, remaining first row expanded then one message will be generated saying First close the expanded row and then open another row.

How this can be implemented ? Any pointer will be very helpful to me. Thanks

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As of 2015, and this question is first in Google search results, I want to add that for PrimeFaces 5.1, there is dataTable attribute rowExpandMode, when set to single - allows only one row to be shown. Example:

<p:dataTable var="line" value="#{bean.lines}" rowExpandMode="single">

It's not exactly what was asked, but I hope that it'll help to others.


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