Custom Sharepoint Form /if isblank then User().Email, if already E-mail then no action

[Applicable88]

Hello,

I'm using a customized sharepoint form via PowerApps. Normally users making inputs via a PowerApp. There is a grayed out field

where I automtatically pulling the users email in a input field: User().Email 

Now I also have a customized form in Sharepoint where users can manage their old items or correcting mistakes. Since every person in the department can correct the items of others, using the same User().Email function would overwrite the actuall creator of that entry.

So I want something like : If (!isblank(DataCardValue1.Text); User().Email)

Which means: When I'm editing a existing record of a collegue don't overwrite email, in case I'm making a new item via customized form then automatically input my email.

Hope somebody has an solution to this. 

Best. 

[iAm_ManCat]

Hi, yes you want to reference the Parent.Default for that item, not the value of the textbox:

// if Parent.Default (the edited value) is blank then user UserEmail, otherwise use the existing value
If (IsBlank(Parent.Default); User().Email; Parent.Default)

[Applicable88 · Accepted solution]

Actually in my case its the DataCardValue which is working, but the Parent.Default not. 

I wrote wrong when I added .Text or .Value at the end. 

Still thank you very much to lead me to the right result @iAm_ManCat