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Show Hide Asterisk Power Apps Dropdown

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Posted on by Fitz

I have a Canvas App Form where I hide the continue button until all required fields are filled in i.e. are not blank.

Once the field is filled in the red asterisk is hidden. This works correctly for the text controls i.e. if I start typing in text the asterisk disappears and if I delete the text within the text control the asterisk reappears.

PROBLEM: However with the dropdown controls - by default they are blank - once an entry is selected the asterisk disappears BUT if I clear the entry (back to blank) the asterisk does not reappear.

This is the Visible function I am using on all the asterisks: If(IsBlank('DataCardValue-xxxxxx'),true,false)

Any help is appreciated.

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iAm_ManCat 18,228 Most Valuable Professional on at

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Hi,

I think you mean a combobox rather than a dropdown?

I was able to use your formula above with a combobox and confirmed the same behaviour.

I would suggest to use the following code for the combobox, where we both check for IsBlank and we check for the number of selected rows:

If( CountRows(ComboBox1_1.SelectedItems)=0 || IsBlank(ComboBox1_1), true, false )

Cheers,

Sancho

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Fitz 14 on at

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Great. I will try that - it may not be correct for my problem. It is not a ComboBox (see attachment).

My solution that works for Visible (I'm sure the function could be more succinct) is for an employees Title (Mr, Mrs etc...)

If('DataCardValue-Title'.Selected.Value="Mr" Or 'DataCardValue-Title'.Selected.Value="Miss" Or 'DataCardValue-Title'.Selected.Value="Mrs" Or 'DataCardValue-Title'.Selected.Value="Ms" Or 'DataCardValue-Title'.Selected.Value="Dr" Or 'DataCardValue-Title'.Selected.Value="Prof" Or 'DataCardValue-Title'.Selected.Value="Rev",false,true)

This shows and hides the asterisk as I intend.

I will be able to use your solution in another part of the form - but if there are any further suggestions to simplify this (I'm happy I've got it working with my own function - I'm sure it could be improved).

Thanks for the reply.

DataCardValue-Tit...

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Bochie 237 on at

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Hi @Fitz ,

Have you tried using Len function instead of IsBlank? If you specify a single string as the argument, the return value is the length as a number. If Len returns zero then it is blank.

-bochie

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iAm_ManCat 18,228 Most Valuable Professional on at

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For your dropdown, do you have 'AllowBlankSelection' to true?

I was able to use a dropdown with your original formula

If(IsBlank('DataCardValue-xxxxxx'),true,false)

and it put the asterisk back after I de-selected the item

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