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on_before_edit
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on_before_edit(item)

**domain**: client 

**language**: javascript

**class** :doc:`Item class </refs/client/item_api>`

Description
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Occurs before an application enables editing of the active record.

The ``item`` parameter an the item that triggered the event.

Write an on_before_edit event handler to take specific action immediately 
before an application enables editing of the active record in an item dataset. 
on_before_edit is called by :doc:`edit <m_edit>` method. 

See also
========

:doc:`Modifying datasets </programming/data/modifying_datasets>`