# About generated id

**URL:** <https://www.ruby-forum.com/t/about-generated-id/143546>\
**Category:** Rails\
**Created:** [July 20, 2008, 9:52am UTC](https://www.ruby-forum.com/t/about-generated-id/143546 "2008-07-20T09:52:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![daociyiyou](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/0ea827/32.png) [@daociyiyou](https://www.ruby-forum.com/u/daociyiyou)\
**Post date:** [July 20, 2008, 9:52am UTC](https://www.ruby-forum.com/t/about-generated-id/143546/1 "2008-07-20T09:52:33Z")

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hello:  
1 what is html element’s id generated from the \<%=select  
“user”,“section”,User::SHIJIAZHUANG-%\>,  
it is:user\_section ?  
2 can i user an instance variable come from an action for select choice  
param?  
for example:\<%=select “user”,“section”,@section-%\>

Thank you!

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<div class="post-metadata">

**Author:** ![daociyiyou](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/0ea827/32.png) [@daociyiyou](https://www.ruby-forum.com/u/daociyiyou)\
**Post date:** [July 20, 2008, 12:30pm UTC](https://www.ruby-forum.com/t/about-generated-id/143546/2 "2008-07-20T12:30:22Z")

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On Jul 20, 8:52 am, Guo Y. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> hello:  
> 1 what is html element’s id generated from the \<%=select  
> “user”,“section”,User::SHIJIAZHUANG-%\>,  
> it is:user\_section ?  
> Well the easiest way is to check for yourself but that sounds about  
> right.

> 2 can i user an instance variable come from an action for select choice  
> param?  
> for example:\<%=select “user”,“section”,@section-%\>

Of course you can.

Fred