AGOL Fields Maps - Date Expression

Question

I am trying to create a relatively simple form in Field Maps using AGOL.

A few questions have come up during the process, and I ended up with similar issues last time I experimented with AGOL.

Dates:
I created a date field which, using an expression defaults to "return now()". This is great, but I have found if I create a entry in FieldMaps then later edit the entry, the date is updated to reflect when it was edited. The date field really wants to be locked to the "Created" date not the edited date.
Is there a way to do this?

Coordinate System:
The phone in my GPS is giving x and y with Lat/Lon - is there a way to include fields for other co-ordinate systems? Like here in New Zealand NZTM is very common.

Fields:

If when I am designing the form in AGOL, and lets say I add a drop down for a field called "Codes" - but then delete the dropdown and use a Radio button - I then can't add a radio selector called "Codes" because there is already a field in the table called "Codes".
It appears removing the input element, doesn't remove the corresponding field from the table, while I can then go and edit the table, doing it this way seems like a clunky design process.
Maybe there is a way to add a input element, and connect it to a existing field in the table?

ChristopherCounsell · Answer

You need a NZTM service. Add it to your basemap layer and remove the other ones.

If you do this and save it as a map, you can share it to your basemaps group and then it'll be available to others for use. But you can't change basemaps in an app to basemaps in a different coordinate system (i.e. back to Esri/WGS84).

https://support.esri.com/en-us/knowledge-base/how-to-use-a-layer-as-a-basemap-in-arcgis-online-and-ar-000028878

https://enterprise.arcgis.com/en/portal/latest/administer/windows/customize-basemaps.htm

AlGrant · Answer

Great answers. Thanks guys.

How would I change the base map to a NZTM one so that I could have NZTM as the default geometry?

Pictures are great.

Thanks

EmilyGeo · Answer

Hi @AlGrant,

@ChristopherCounsell provided some great responses.

I wanted to add on to the response to Question 3 regarding adding existing fields to forms. Yes, this is possible. When adding fields to a form, you have the option to:

A) Create new fields as you've been doing, by selecting an input type from the options on the right.

B)  You can also drag and drop existing fields onto the form (ie Codes). On the right, scroll down toward the bottom to see the Fields you can choose from. You should see the Codes field listed there. Then you can format that field however you like (drop down, radio button, etc).