=================
on_filter_changed
=================

on_filter_changed(filter, lookup_item)

**domain**: client 

**language**: javascript

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

Description
===========

Write an ``on_filter_changed`` event handler to respond to any changes in the 
filter’s data.

The ``filter`` parameter is the filter whose data has been changed. To get the 
item that owns the filter, use the 
:doc:`owner </refs/client/filter/at_owner>` 
attribute of the filter.

See also
========

:doc:`Filters </programming/data/filters>`

:doc:`value </refs/client/filter/at_value>`


