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Frequent Visitor

Picking up the correct date from Sharepoint List onto Power Apps

Hello! I need some assistance on my formula so that the correct date can be picked up from my Sharepoint List onto Power Apps.


Here’s my context: I am trying to create an app for ticket reservations, and each person can only reserve the ticket once every 2 months. Eg: If I reserve the ticket today (17/09), I can reserve a ticket that is dated 2 months from today (17/11 onwards). My formula on Power Apps would check through 2 columns from my Sharepoint List: Status (= Reserved) and Date of Visit.

Here’s my problem:  My current formula can’t fulfil the condition to book once every 2 months. For eg: I first make a booking for 1 Jan 2022 and make a second booking for 1 Oct 2021. If I make a third booking for 31 Dec 2021, instead of stopping this reservation from happening since my next booking is on 1 Jan 2022, my formula would allow this reservation to be submitted instead because it is more than 2 months from 1 Oct 2021.


How should I go about refining my formula? Here's my formula:

If(And((LookUp(Sort(SharepointList,DateofVisit,Descending), ID=DataCardValue16.Text,Status="Reserved") And (LookUp(Sort(SharepointList,DateofVisit,Descending), ID=DataCardValue16.Text,DateofVisit)-DataCardValue22.SelectedDate)<=60),((LookUp(Sort(SharepointList,DateofVisit,Descending), ID=DataCardValue16.Text,Status)="Reserved") And (DataCardValue22.SelectedDate-(LookUp(Sort(SharepointList,DateofVisit,Descending), ID=DataCardValue16.Text,DateofVisit))<=60))),"You can only make a booking once in every 2 months.",""))


Have tried multiple ways but am still stuck at it. Appreciate your help, thank you!

Super User
Super User

Hi @j_y ,

You might try something like this - although I am wondering how the ID which is numeric is equal to the value in DataCard16.Text

         ID=DataCardValue16.Text &&
      wDate1:DataCardValue22.SelectedDate - 60,
      wDate2:DataCardValue22.SelectedDate + 60 
            DateofVisit =< wDate &&
            DateofVisit > wDate1
      ) ||
            DateofVisit >= wDate &&
            DateofVisit < wDate2
      "You can only make a booking once in every 2 months.",


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Frequent Visitor

The ID here is actually the Pass ID (alpha-numeric) that the individual will input, hence it is a text instead. I tried the formula, but it doesn't work.. I dont really get the LookUp formula, and I have no idea how to go about using With formula. Is there a way that I can use a For All formula? 


Also, I am aware that using Sort is the main reason that is causing my formula to fail, but I'm not sure how should I go about checking all dates on the sharepoint list..

@j_y ,

I simply answered your posted query Picking up the correct date from Sharepoint List onto Power Apps

"does not work" unfortunately will not let me assist you - is there an error (if so what) or does it not produce the desired result. ForAll() is not something relevant here.

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