Param function not capturing value

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Posted on by BCBuizer

22,505 Super User 2025 Season 2

Hi All,

I'm running into the strangest issue with the Param() function as it doesn't seem to capture the passed value. The URL I'm using looks like this:

https://apps.powerapps.com/play/[appId]?tenantId=[tenantId]?Document=[TextValue]

The code I have in my OnStart and StartScreen wasn't working as the users are not navigated to the expected screen (screen2), showing the expected data (variable). I then added a label to see what value was passed with Param (Document) and it seems to be a blank, regardless of what I pass for TextValue.

OnStart = If(IsBlank(Param(Document)),true,Set(variable,LookUp([DataSource], Title=Param(Document)))

StartScreen = If(IsBlank(Param(Document)),Screen1,Screen2)

TSLabel Text = Param(Document)

What am I missing?

Categories:

Building Power Apps

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RandyHayes 76,297 Super User 2024 Season 1 on at

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@BCBuizer

Your parameter in the url needs an ampersand, not a question mark.

i.e.

https://apps.powerapps.com/play/[appId]?tenantId=[tenantId]&Document=[TextValue]

Also, you can alter the OnStart to the following:

Set(variable, LookUp([DataSource], Title=Param(Document)))

Your variable will be blank if there is no param...which is the same as you had in your other formula. So, you can cut out the extra parts.

Your StartScreen is already referring to the param value, so that will all be fine.

I hope this is helpful for you.

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @RandyHayes,

Thanks for the quick reply and the tips on streamlining the OnStart.

Sorry I failed to mention I did try the ampersand with the same result:

https://apps.powerapps.com/play/[AppId]?tenantId=[tenantId]&Document=[TextValue]

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RandyHayes 76,297 Super User 2024 Season 1 on at

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@BCBuizer

Oh sorry, should have put in quotes:

Set(variable, LookUp([DataSource], Title=Param("Document")))

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RandyHayes 76,297 Super User 2024 Season 1 on at

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@BCBuizer

And same in your StartScreen...need quotes there too.

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Yep, that is what I missed... Thanks!

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RandyHayes 76,297 Super User 2024 Season 1 on at

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@BCBuizer

Sometimes it's hard to see the forest from the trees 😁

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