unable to set a global variable on the screen OnVisible() property

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Posted on by johnjohnPter

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on the app onStart i am setting those variables based on the id paramters:-

Set(varNavigationID,Value(Param("id")));

and then on the screen onvisible i am setting a global variable, as follow:=

Set(varBCID,Blank());
If(IsBlank(varBCID),If(!IsBlank(varNavigationID),Set(varBCID,varNavigationID),Set(varBCID,varBCID)),Blank());

but this is raising these errors:-

any advice how to fix these issues?

thanks

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WarrenBelz 156,566 Most Valuable Professional on at

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@johnjohnPter ,

Try setting to zero instead of blank - it is a numeric variable.

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johnjohnPter 2,082 Season of Giving Solutions 2025 on at

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@WarrenBelz ok set the formula as follow:-

Set(varBCID,0); If(IsBlank(varBCID),If(!IsBlank(varNavigationID),Set(varBCID,varNavigationID),Set(varBCID,varBCID)),0);

but still same error, the error will happen when i access the published app or when i close and reopen the app on design mode.. not sure what is wrong ?
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Chris-D 1,246 on at

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@johnjohnPter , why are you setting varBCID to Blank() and then immediately checking if it's blank? I think your code needs tweaking here?

// Set to blank Set(varBCID,Blank()); If( // ALWAYS TRUE IsBlank(varBCID), // This always happens If( !IsBlank(varNavigationID), Set(varBCID,varNavigationID), // Set variable to itself?? Completely pointless. Set(varBCID,varBCID) ), // Never happens, but Blank() is a return code in this case, you're not setting anything Blank() );

Why not just:

If( !IsBlank(varNavigationID), Set(varBCID,varNavigationID));

Am I missing something?
WarrenBelz 156,566 Most Valuable Professional on at

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@johnjohnPter ,

The error you are getting is that you have a Variable that you are setting to another data type somewhere else - this is either varBCID or varNavigationID, so you need to look for all instances of these being set to find the offending item.