Modern Controls - Dropdown Default Property

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Posted on by Sulako

Evening all, i need some help please. No matter what i do i cannot set the Default Property of the new Modern Control Dropdown control as per the below screenshot. Not matter what syntax i have tried to use (examples below) nothing works and the error of 'Invalid formula. Expected a value compatible with 'Items' persists.

ThisItem.OBS_SimplexDuplex

/*LookUp(

    colOuterBoxes,

    OBS_Index = ThisItem.OBS_Index,

    OBS_SimplexDuplex

)*/
/*LookUp(

    colOuterBoxes,

    OBS_Index = ThisItem.OBS_Index

).OBS_SimplexDuplex*/
/*LookUp(

    colOuterBoxes,

    OBS_Index = ThisItem.OBS_Index,

    OBS_SimplexDuplex

) & ""*/
/*Coalesce(

    LookUp(

        colOuterBoxes,

        OBS_Index = ThisItem.OBS_Index,

        OBS_SimplexDuplex

    ),

    ""

)*/

The value is stored in a collection and is initialised as text :     OBS_SimplexDuplex: ""
To be honest i have tried to initialise this differently to no avail.

Am i doing something wrong?

If i use a classic control (marked in blue in the below screenshot) this works just fine and while i here the argument of "just use a modern control then" the design difference between the controls means i cannot get a classic control to mimic the design of a modern control. So why would a modern control not work as per the classic control?

I would greatly appreciate any assistance or pointers to try and resolve this.

Thank you.

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Building Power Apps

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Pstork1 69,397 Most Valuable Professional on at

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What are you using as the formula for the Items property of the dropdown? The error appears to be related to some mismatch with how that field is defined in the Items property. Is it a Data Source, a Collection, or something else?

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Haque 2,780 on at

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Hi @Sulako,

What is the data type you want to display? If your dropdown is bound to a complex data source, use a LookUp or filter to return the matching record(s) as a single-item table. For example:

Items = [ { Value: "Red" }, { Value: "Green" }, { Value: "Blue" } ] DefaultSelectedItems = [ LookUp(Items, Value = "Green") ]

Assuming your Dropdown’s Items property is bound to a collection like this:

ClearCollect( colOptions, { OBS_SimplexDuplex: "Simplex" }, { OBS_SimplexDuplex: "Duplex" } )

And your selected value is stored as text in a variable or context variable, e.g.:

UpdateContext({ selectedValue: "Simplex" })

Then set the Dropdown’s DefaultSelectedItems property to a single-item table with the matching record:

Filter(colOptions, OBS_SimplexDuplex = selectedValue)

or equivalently:

[LookUp(colOptions, OBS_SimplexDuplex = selectedValue)]

I am sure some clues I tried to give. If these clues help to resolve the issue brought you by here, please don't forget to check the box Does this answer your question? At the same time, I am pretty sure you have liked the response!

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11manish 2,252 on at

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The issue occurs because modern dropdown controls in Power Apps expect the Default (specifically DefaultSelectedItems) to be a full record that matches the

structure of the Items property, not just a text value. Your formulas return text, which works for classic controls but not for modern ones.

To fix this, you need to return the full record using LookUp and wrap it in a table (e.g., [LookUp(...)]) so it matches the Items schema.

Classic control:

Default = "Simplex"

Modern control:

DefaultSelectedItems = [{ OBS_SimplexDuplex: "Simplex", ... }]

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Sulako 51 on at

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Hi all, thank you for the feedback so far. The items property is simply ["Simplex","Duplex"] but no matter what i use in default it still seems to error.

Regards,

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Sulako 51 on at

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If it helps here is a simple test for you all to try.

This errors with - Invalid formula. Expected a value compatible with 'Items'.

Screens:
Screen1:
Properties:
LoadingSpinnerColor: =RGBA(56, 96, 178, 1)
Children:
- Button1:
Control: ModernButton@1.0.0
Properties:
Height: =62
OnSelect: |-
=ClearCollect(
Test,
{
OBS_Index: 1,
OBS_SimplexDuplexModern:"",
OBS_SimplexDuplexClassic: ""
}
)
Text: ="Initialise"
Width: =129
X: =156
Y: =88
- Gallery1:
Control: Gallery@2.15.0
Variant: BrowseLayout_Vertical_TwoTextOneImageVariant_ver5.0
Properties:
BorderColor: =RGBA(0, 18, 107, 1)
Fill: =RGBA(180, 214, 250, 1)
Height: =373
Items: =Test
X: =614
Y: =88
Children:
- Subtitle1:
Control: Label@2.5.1
Properties:
BorderColor: =RGBA(0, 0, 0, 1)
Font: =Font.'Open Sans'
FontWeight: =If(ThisItem.IsSelected, FontWeight.Semibold, FontWeight.Normal)
Height: =Self.Size * 1.8
OnSelect: =Select(Parent)
PaddingBottom: =0
PaddingLeft: =0
PaddingRight: =0
PaddingTop: =0
Size: =12
Text: =
VerticalAlign: =VerticalAlign.Top
Width: =
X: =
Y: =
- Separator1:
Control: Rectangle@2.3.0
Properties:
BorderColor: =RGBA(0, 18, 107, 1)
Fill: =RGBA(255, 255, 255, 1)
Height: =8
OnSelect: =Select(Parent)
Width: =Parent.TemplateWidth
Y: =Parent.TemplateHeight - Self.Height
- Rectangle1:
Control: Rectangle@2.3.0
Properties:
BorderColor: =RGBA(0, 18, 107, 1)
Fill: =RGBA(0, 18, 107, 1)
Height: =Parent.TemplateHeight - Separator1.Height
OnSelect: =Select(Parent)
Visible: =ThisItem.IsSelected
Width: =4
- modernDropdown1:
Control: ModernDropdown@1.0.0
Properties:
Default: =Filter(Test,OBS_SimplexDuplexModern = ["Simplex" || "Duplex"])
ItemDisplayText: =ThisItem.Value
Items: =["Simplex","Duplex"]
X: =83
Y: =58
- Dropdown1:
Control: Classic/DropDown@2.3.1
Properties:
BorderColor: =RGBA(0, 18, 107, 1)
ChevronBackground: =RGBA(56, 96, 178, 1)
ChevronFill: =RGBA(255, 255, 255, 1)
ChevronHoverBackground: =ColorFade(RGBA(56, 96, 178, 1), -20%)
ChevronHoverFill: =RGBA(255, 255, 255, 1)
Default: =ThisItem.OBS_SimplexDuplexClassic
Font: =Font.'Open Sans'
HoverFill: =RGBA(186, 202, 226, 1)
Items: =["Simplex","Duplex"]
Items.Value: =Value
OnSelect: =Select(Parent)
PressedColor: =RGBA(255, 255, 255, 1)
PressedFill: =RGBA(0, 18, 107, 1)
SelectionColor: =RGBA(255, 255, 255, 1)
SelectionFill: =RGBA(56, 96, 178, 1)
X: =83
- Button1_1:
Control: ModernButton@1.0.0
Properties:
Height: =62
OnSelect: |-
=ForAll(
Gallery1.AllItems As r,
Patch(
Test,
LookUp(Test, OBS_Index = r.OBS_Index),
{
OBS_SimplexDuplexModern: modernDropdown1.Selected.Value,
OBS_SimplexDuplexClassic: Dropdown1.Selected.Value
}
)
);
Text: ="Patch"
Width: =163
X: =380
Y: =88

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Sulako 51 on at

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Fix: {Value:ThisItem.OBS_SimplexDuplex}

I must have tried so many permutations and couldnt have tried this one.

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