Is there a way to change assignee based on a field?

[Kathleen Jacobs]

There are two different people a ticket can be assigned to.

If a field has a value, it should go to person A. If it does not have a value, it should go to Person B.

Is there a way I can set this up in a post function or something in the workflow?

[Jobin Kuruvilla [Adaptavist]]

Not possible on onDemand as it requires some customization/plugins.

[Taber Loveless]

I am interested in this for non-ondeman.

Would you pls expand on what custom/plugins are required?

[RambanamP]

you have to write your own postfunction in custom plugin

check out this blog

http://www.j-tricks.com/1/post/2010/08/workflow-post-function.html