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multiple expressions and variable condition in Canvas App

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Posted on by bravoss

I have a chain of expressions on a button click event where I keep updating the context variable errorMsg and at the end check to see if the variable is empty(IsEmpty/IsBlank) to do one thing or do another. For some reason it always appears to be finding variable errorMsg to be empty. I am assuming that this is probably due to this being evaluated before the previous expressions are executed. Is this understanding correct ? And how do I overcome this.

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eka24 20,925 on at

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Please can you show your expression.
Check out difference in IsEmpty/Isblank
https://powerusers.microsoft.com/t5/Building-Power-Apps/IsBlank-IsEmpty-or-quot-quot/td-p/180395

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bravoss 26 on at

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Here is a snippet of the expression that I use
UpdateContext({
varErrorMsg:
If(IsBlank(DataCardValue2.Selected.Value),Concatenate(varErrorMsg,"Error: 1"),Concatenate(varErrorMsg,""))
});
UpdateContext({
varErrorMsg:
If(!IsBlank(DataCardValue12)&&IsBlank(DataCardValue15),Concatenate(varErrorMsg,Char(13),"Error: 2."),Concatenate(varErrorMsg,""))
});
UpdateContext({
varErrorMsg:
If(DateDiff(DateTimeValue(Text([@ModelDrivenFormIntegration].Item.'End Date',DateTimeFormat.ShortDate) ),(DataCardValue12.SelectedDate))>0,Concatenate(varErrorMsg,Char(13),"Error: 3."),Concatenate(varErrorMsg,""))
});
SubmitForm(Form1);
If ((IsEmpty(varErrorMsg)) ,
Navigate(SCR_1) ,
Navigate(SCR_2)
);

Note: IsEmpty/IsBlank have both been tried by me.

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WarrenBelz 155,779 Most Valuable Professional on at

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Hi @bravoperss ,
Can you please use Format Text on this code and post in a box (</> icon at end of first row above) and I will have a look at it for you.

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bravoss 26 on at

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Thanks for the reply. The above now appears to be working for me. I am not sure what resolved it if it was an issue with the expression or clearing of variables, but it now works fine.

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