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hivechris
Frequent Visitor

Registration Form with Limited Subscribers

I created a simple app, to register my users on Workshows, events, etc.

 

I would like to limit the number of subscribers for this.

 

For example, 100 users per event and show a message when we reach this.

 

Is there possible?

1 REPLY 1
wyotim
Resident Rockstar
Resident Rockstar

This is definitely possible! You would need to do a few things to make it work, but thankfully nothing too crazy. For starters, you would need to have a list of the subscribers for said event. You could do this by creating a collection of those subscribers, perhaps when an event is selected or something like that. The collection would need to be filtered by the event.

 

For instance, let's say you have a table of the subscribers (let's call it EventSubscribers) for the events with columns for their Name, Email, and an ID for the event itself called EventID. You would collect the filtered table like so:

// Collect a fresh table filtered by a selected event
ClearCollect(
colFilteredSubscribers,
Filter(
EventSubscribers, EventID = varSelectedEventID ) )

The varSelectedEventID would be a context variable holding the event ID you want. If you had a gallery of these events, you could put the following in the OnSelect property of that gallery to create the variable:

// OnSelect of the event gallery
UpdateContext({varSelectedEventID: ThisItem.ID})

This would make it easy to count the number of event subscribers using either CountRows if you know that each row will contain a unique subscriber or by counting the distinct subscriber names or emails.

// CountRows version
CountRows(colFilteredSubscribers)

// Distinct version using the email column
Count(Distinct(colFilteredSubscribers, Email))

Let's also assume you have a button to add subscribers. In the DisplayMode of the button, you could add an If statement to check the count of subscribers and if that number is 100, disable the button. That would look something like:

// DisplayMode property of the button
If(
    CountRows(colFilteredSubscribers) >= 100, // Note the >= instead of =, just in case it goes over somehow
    DisplayMode.Disabled,
    DisplayMode.Edit
)

You could also set up a prompt using a similar If statement, putting it in the Text property of a label, but replacing the DisplayMode sections with the text you want to display and/or making the label visible using similar means.

 

I hope that makes at least some sense! Let me know either way; I'd be happy to work out the details of your specific situation if needed.

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