# Does observe\_field work in a partial

**URL:** <https://www.ruby-forum.com/t/does-observe-field-work-in-a-partial/156688>\
**Category:** Rails\
**Created:** [January 1, 2009, 3:12am UTC](https://www.ruby-forum.com/t/does-observe-field-work-in-a-partial/156688 "2009-01-01T03:12:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![youhaodeyi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/b9bd4f/32.png) [@youhaodeyi](https://www.ruby-forum.com/u/youhaodeyi)\
**Post date:** [January 1, 2009, 3:12am UTC](https://www.ruby-forum.com/t/does-observe-field-work-in-a-partial/156688/1 "2009-01-01T03:12:59Z")

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I defined a partial and put an observe\_field in this partial, but it  
doesn’t invoke the action when the field changed, this is the code:

 \<%=select\_tag 'project\_version', options\_for\_select(@project\_versions)%\> \<%= observe\_field :project\_version, :update=\>'view\_name', :url=\>{:action=\>'update\_view\_name'}, :with=\>"'project\_selection='+$('project\_selection').getValue()+'&project\_version='+encodeURIComponent(value)"%\> \<%= render(:partial=\>'view\_name',:layout=\>false) %\>