OnChange event on Combobox is occurring On Load

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Posted on by GFinlayTerumo

118

I have a Power App that is being populated by a SP list which I am looking to trigger an OnChange event which changes a variable to true if the user selects an item from a combobox.

It works fine when using the combobox to make/remove a selection but I am having a problem where the OnChange is being triggered when the user opens the Power App to Edit an existing record and it loads its values.

When the user opens a form to edit an existing record the ReturnCheck variable is true, it should be false by default and only set to true where the user changes the value in the Combobox. Is there a way to make sure the ReturnCheck variable does not change when the Form loads it values?

App OnStart

Set(ReturnCheck,false);

Combbox OnChange

If(
    Not(IsEmpty(DataCardValue7.SelectedItems)),
    Set(
        ReturnCheck,
        true
    );
    ,
    Set(
        ReturnCheck,
        false
    );
);
 

Categories:

Power Apps component framework

All responses (4)

Answers (0)

jpespena 335 on at

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OnChange event on Combobox is occurring On Load

Hi,

If my post helped resolve your issue, please click Accept as Solution—this helps others find it more easily and marks the item as closed. If you found this or my previous reply helpful, a Like would also be appreciated!
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GFinlayTerumo 118 on at

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OnChange event on Combobox is occurring On Load

Hi again

I was able to figure this out by updating your suggestion to

If(

Self.Selected.DisplayName <> ThisItem.'Returned User'.DisplayName,

If(

Not(IsEmpty(DataCardValue7.SelectedItems)),

Set(

ReturnCheck,

true

);

,

Set(

ReturnCheck,

false

);

),false

);

Thanks
GFinlayTerumo 118 on at

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OnChange event on Combobox is occurring On Load

Hi @jpspena thanks for you reply. I have given it a try and am having some issues.

Firstly Self.Selected.Value returns an error "Value isn't recognised".

Secondly I am not selecting a value from a Gallery, the Power App Form is selected directly from SharePoint New/Edit, I am editing the integrated default form for the list.

I have tried to update it to the following but the <> is giving me another error of

"Incompatible types for comparison. These types can't be compared: Record, Record."

If(

Self.Selected <> ThisItem.'Returned User',
Suggested answer

jpespena 335 on at

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OnChange event on Combobox is occurring On Load

Hi,

Try adding a validation on the Combobox that the value is changed, like:

If( Self.Selected.Value <> Gallery.Selected.ComboboxField.Value, If( Not(IsEmpty(DataCardValue7.SelectedItems)), Set( ReturnCheck, true ); , Set( ReturnCheck, false ); ) );

This way, it will only be triggered if the value of the combobox is not equal to the field from the selected item in the gallery.

If my post helped resolve your issue, please click Accept as Solution—this helps others find it more easily and marks the item as closed. If you found this or my previous reply helpful, a Like would also be appreciated!