How to filter the results of a dropdown based on an IF statement and the results of another dropdown

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Posted on by lesotho_kid

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Hello,

We are populating the Items of a dropdown box with the calculation below. This works fine.

Sort(Distinct(Filter('MyLookup', LookupType=LookupType.Selected.LookupTypeName), FinalName),Result,Ascending)

But, we would like the filter logic to be different based on the value in the LookupType dropdown:

LookupType=LookupType.Selected.LookupTypeName

i.e. If (LookupType.Selected.LookupTypeName="x" Filter by "x"

ELSE If LookupType.Selected.LookupTypeName="y" then do not apply ANY filter - show everything.

I've tried various methods of doing this but none have worked.
Any help appreciated.

Thanks,

Dan

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Building Power Apps

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Drrickryp Super User 2024 Season 1 on at

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Hi @lesotho_kid

Rather than get down in the weeds and work thought the logic, I like use UpdateContext() to create a variable as an alias for the function. so

UpdateContext({varA: ComplexformulaA});UpdateContext({varB: ComplexformulaB})

in the Items propery of the gallery or datatable: If(conditionA, varA, varB)

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lesotho_kid 106 on at

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Thanks @Drrickryp
That helps a gives a different way of looking at the problem. Helps with several other calcs also since that field is frequently used.
One follow-up question. Where would I put the UpdateContext code? In the 'OnChange' event of the dropdown box which all these formulas are referencing?

Thanks Again!
Dan

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Drrickryp Super User 2024 Season 1 on at

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Hi @lesotho_kid

I would use a button or icon but you could use the onchange of the dropdown. You would need to put the context variable that you choose for a default in the OnVisible property of the screen containing the dropdown so the gallery wasn't blank when the screen opens. Another way to do it if you have several different formulas is to use a Radio control with the labels as the different filters.

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lesotho_kid 106 on at

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Thanks @Drrickryp ! Appreciate your help with this.

Thanks,
Dan

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Drrickryp Super User 2024 Season 1 on at

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Just a quick note since you mentioned that you may be using the variable in other places in your app. In that case, I would use the Set() function instead of the UpdateContext() function. The Set() function creates a global variable that will be available throughout all the screens in your app until you change it. UpdateContext() only applies to the active screen. The syntax for the Set() function is very similar to UpdateContext() except it doesn't use curly braces and has a comma instead of a colon. So Set(var,Formula) instead of UpdateContext({var:Formula})

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