I want to retrieve user name on the basis of first name . How can I achieve this ?
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How are you getting the list of to populate the drop down? There is a plugin that can be used to search users by properties, but if more than one user is returned with the same first name and last name, that would be an issue because you cannot ensure you are selecting the correct user.
This plugin, https://community.appian.com/b/appmarket/posts/personalization-utilities, will allow you to search users by various fields.usersearch( {"firstName"}, {0}, {"Larry"})
user search () is not a valid function in appian 21.1
Why can you not use a userpicker field? What are you trying to accomplish with the drop down? It is a plugin that has to be added to your environment.
How are you building your array for the dropdown? Is it being queried from a table in a database?