How To-set DFF to null and Not required in OAF page ??

enabled service dff, added 2 segments. i want them displayed in service request oaf pages.
details of dff-
Application=Service , title = Additional Information for Agents
in context field region : unchecked required and displayed
In global data elements - added 2 segments based on value set(validation type = independent, list type = poplist)
displayed and enabled checkbox are checked for both the segments.
I want to be able to do two things
1.in HTML service request agentdashboard- the 2 new dffs are displayed correctly as drop down lists. I can pick and save a value to those mapped columns.
but the two drop downs are REQUIRED. I do not want them to be. how can I make them un-required.
--while personalizing this flexfield elemnt from oaf page - I did not have the attribute-required to be unset.
2. I want a default blank value in both the drop down list.
I tried to add a nullvalue in valueset ,but its not letting me. can i do that ??
any pointers please.
Thanks in advance

For your question
>
if I want to show one segment based on value of some other bean in the UI, then can I do it ? and how ?
>
If you do not want to extend controller then you need to use javascript. Sample code below
<SCRIPT>if (document.getElementById("QFEQHR_FV").value =='Class Room')
{document.getElementById("DescFlex2").style.visibility = "visible";}
else{document.getElementById("DescFlex2").style.visibility = "hidden";} </SCRIPT>Here "QFEQHR_FV" is any bean ID in your page and "DescFlex" is DFF flex item ID. To get handle of the required DFF attribute change numbers starting from '0' and test.
Sample code for testing
<SCRIPT>alert(document.getElementById("DescFlex0").value);</SCRIPT>You need to add this code to "Text" property of a "Raw Text" item.
Regards,
Anand

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