Avoid current user to duplicate the registration

[vadiraj1100]

Hi All,

I have a sp list which will be updated by the form using canvas app.

Each entry will have Team including 5 team members. eg  mem1@g.com , mem2@g.com  .... mem5@g.com

Now if any of the user from this entry comes and try to register it should check the current logged in user with the entry and if the user exists in the entry he should be navigated to "Already Registered" page , Else he should be navigated to "Home Page"

where he can continue to register as usual.

I have tried On start of App

If(IsBlank(LookUp('List name', User().Email ='Team Member 1 - Mail'.Email)),Navigate('Already Registered',ScreenTransition.Fade),Navigate('Home Screen',ScreenTransition.None))

Not sure what is going wrong here but the new user is also prompted to Already registered page. Even if he is not part of any entry.

[CNT]

@vadiraj1100 The condition should probably be 'Team Member 1 - Mail'.Email=User().Email

[Drrickryp]

@vadiraj1100 

What happens if you change the

IsBlank to !IsBlank.

[vadiraj1100]

Hi @CNT ,

No this change didnt work, Are you sure the code i am using is the right one for my requirement? Do you have any suggestion

[vadiraj1100]

Hi @Drrickryp ,

No this change didnt work, Are you sure the code i am using is the right one for my requirement? Do you have any suggestion

[Drrickryp]

I didn't ask if it worked, I asked what happened? Did it go to the other screen?

[vadiraj1100]

Sorry, Nope it didnt go to another screen.

[Drrickryp]

@vadiraj1100 

I suspect the logic isn't working because the data for the comparison is not available in the OnStart. Try to collect the data in the list first and then run your formula against the collection.

[vadiraj1100]

I have entered my name in the Team Member 1 - Mail and submitted the form .. If i try to access the application it should essentially prompt me to Already Registered page .. But that is not Happening 

[Drrickryp · Accepted solution]

@vadiraj1100 
Give this a try.  In your formula, the logic implies that if the Lookup is blank (meaning that the person signing in is not already in your list, then you will be directed towards the already registered page.  I don't think this is what you intended.  My formula looks to see if the lookup is NOT blank, meaning the person signing in is already in your list. Then they will be directed to the already registered screen.  In addition, please  make sure that your list accurately reflects the User's email when they sign in. 

Set(Useremail,User().Email);
Collect(collist,'List name');
If(
    !IsBlank(
              LookUp(collist, 'Team Member 1 - Mail'.Email = useremail
             ), Navigate(
                          'Already Registered',ScreenTransition.Fade
                ), Navigate(
                             'Home Screen')
                    )
)