# Dynamic behaviour with dropdown

**URL:** <https://discourse.openondemand.org/t/dynamic-behaviour-with-dropdown/2320>\
**Category:** Get Help\
**Tags:** question\
**Created:** [October 17, 2022, 2:56pm UTC](https://discourse.openondemand.org/t/dynamic-behaviour-with-dropdown/2320 "2022-10-17T14:56:58Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![nobodyme](https://sea1.discourse-cdn.com/flex015/user_avatar/discourse.openondemand.org/nobodyme/32/1307_2.png) [@nobodyme](https://discourse.openondemand.org/u/nobodyme)\
**Post date:** [October 17, 2022, 5:46pm UTC](https://discourse.openondemand.org/t/dynamic-behaviour-with-dropdown/2320/4 "2022-10-17T17:46:30Z")

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I see, OnDemand version is `2.0.18`

I see [from here](https://discourse.openondemand.org/t/dynamic-form-widgets-official-release/2194) that this type of form building is available only from 2.0.27. So, guess that is the issue?  
Can you point me to any docs on how to build with `form.js`?

In many places in form.js, I see, `batch_connect_session_context` identifier prefix used. Is that the default prefix that’s added to get the value of any field in `form.yml`?

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