Hi,
I'm using JIRA Service Desk.
I have created a JSON Request Custom Field to pull out the user's computer names and IP's (from our AD):
On the agent side i have the possibility to select the user computer name/ip through the drop down list of the field -> this is awesome (see prtscrn):
computer ip list.jpg
The problem is: when i try to add this field to issues fields (for customers) i got the message:
"This field type cannot be shown - you must provide a preset value" -> not ok for my needs. See screen shot:
Screen Shot 09-06-15 001.JPG
The idea is to give the possibility to users to add/select their Computer name or IP to the issue on the create issue form (via Portal).
The Json custom field is not hidden, is linked to the right Screen of the project.
Any idea? I really need this feature because on our Service desk the IP or computer name are 95% mandatory. We want to push the users to use JIRA and give up to phone calls, for that we need a maximum info's when the user fill the request.
I'm open to others solutions to add this feature, except JIRA Capture... The Environment field build in JIRA do NOTHING
, i meen we have to fill out manually...
If there is a possibility to get the user environment (OS, IP, browser etc) automatic and insert in the requests THAT will be a best of!
Big thank's in advance 
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UPDATE:
An Agent Create a issue -> see the fields available on the Agent side (i have the option to chose the Computer name or IP on the drop down list):
Remember: the Computer and IP fields are my Custom JSON fields.
Screen Shot 12-06-15.JPG
WHEN i try to ADD one or both Fields (Computer and/or IP) on the Issue Fields FOR Customers Portal -> i click on Add Field -> select Computer/IP -> click Apply -> the Field(s) became Hidden with the message: This Type of Field cannot be show. You have to add a preconfigured value. My needs: make this fields VISIBLE for the Portal Customers with the option to chose from.
If someone who has an idea/solution need more specific info i'm at your service
. If not well explained just let me know.
See print screens:
Screen Shot 12-06-15 001.JPG
Screen Shot 12-06-15 002.JPG