I have a Portal containing a Checkbox with the value of "Paid"
When "Paid" is selected how do I get it to add a set amount, say 20, to a field called "Total" outside the Portal?
Also when un-selected it needs to remove the same amount from the "Total" field.

With Thanks

Mick

Not sure it's ideal without more details

On the child table create a field:

Paid Amount = Case ( child::checkbox = "paid" ; 20 ; ""  ) 

Then in the parent table create a field:

Total Paid = Sum ( child::Paid Amount ) 

 

12 hours ago, Mickdn said:

When "Paid" is selected how do I get it to add a set amount, say 20, to a field called "Total" outside the Portal?

I'd suggest you rethink your strategy here, because prices, fees, etc. change as time goes by - and you don't want future changes to affect existing records.

Ask yourself instead: how do I auto-enter the currently charged amount into a field in the child table - either upon creation, or upon recording the actual payment?

Thanks for the replies, I've attached a file which should explain it in more detail.

The amount will never really change, it's just a small database for a collection of mates that want to track what they pay into a syndicate.

Thanks again.

File.zip

24 minutes ago, Mickdn said:

The amount will never really change

Famous last words ...  But if you are sure about that, you can use a calculation field (defined in the parent table) =

Count ( Child::Paid ) * 20

to calculate the total amount paid.

This assumes the Paid field will be empty if not checked. Your title speaks of a radio button, but your question speaks of a checkbox - that's kind of confusing.

 

Edited December 23, 201510 yr by comment

Works great, so sorry for the Checkbox, Radio Button mix up.

Many Thanks