Clear DefaultSelecteditems of a ComboBox When Selection Changes. Assume this would be in OnChange Event?

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Posted on by tflynn5005

Form is for Editing a Matter

The form's Default mode is edit. The Forms Item property is set to the Selected Gallery Item...GalMatters.Selected

There are a serires of datacards that are foreign keys in a table

Here is an example of one of the Data Cards.

This is for Probation Officers

The DataCard field is a foreign key in the form's table...tblMtr. The field is MtrPro1

The DataCardValue's Default Value is set to a combo box selected item.....cmboMtrEditPro.Selected.ProID

The ComboBox Default selected items is set to the DataCard fields value Filter('[dbo].[tblPro]',proID = MtrPro1)

Accordingly, When Someone selects a matter in the GalMatter Gallery the Edit form populates the combo boxes with the record corresponding with the foreign key.

All well and good. The rub is when you want to change the selection from Probation officer Joe Smith to Jane Doe. When you submit the form the Default for the DataCard goes back to the DefaultSelectedItems.

Its essentially circular. Is there a method for the OnChange event that would clear the DefaultSelectedItems for the combo box.

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Building Power Apps

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tflynn5005 25 on at

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UPDATE*****
Correction this works as designed. YOu can change to Jane Doe. The hang up is when you want to change the assignement to a null i.e. no assinged Probation Officer. It reverts back to the default. So how do you write a Null to the SQL AZURE table??? the columns property in SQL Azure Allow Nulls is set to yes so it is not a back end issue. I'm Stumped.

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v-yutliu-msft on at

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Hi @tflynn5005 ,
Do you want to write a null value to a foreign key field?
Could you describe more clearly about the field's name?
I assume that the form is binding with the tblMtr table, MtrPro1 is the foreign key.
the other table's name is tblPro, proID is the primary key.
Sine the primary key can't be null value, so you can't filter a record if the MtrPro1 is null value by using this formula: Filter('[dbo].[tblPro]',proID = MtrPro1)

I suggest you use the if statement.
If(IsBlank(assignement.Text),[],Filter('[dbo].[tblPro]',proID = MtrPro1))

Best regards,
Community Support Team _ Phoebe Liu

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Community Power Pla... on at

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Hi @tflynn5005 can you review the above reply and update the thread if it was helpful?

Thank you,

@Anonymous

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