How to use a dropdown in a component to control a variable

[Humanity]

We have a dropdown in a component menu, that lists the name of buildings a user may choose from.  When a person chooses one it is to change the app BUILDING variable.

[yashag2255]

Hi @Humanity 

Can you try to update the OnChange property of the dropdown control to:

Set(BUILDING, DropdownName.Selected.ColumnName)

Hope this Helps!

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[v-yutliu-msft · Accepted solution]

Hi @Humanity ,

Do you want to use a drop down inside a component to change a global variable?

That means: you need to use control inside component to trigger an action.

However, the point is: it's not supported to customize behavior property of component.

The solution is to use toggle to trigger the action of setting variable.

However, toggle's value could only be true or false. So you could use toggle to do this only when you want BUILDING variable has two value, more is not supported.

I've made a similar test for your reference:

1)drop down inside the componnet:

Items:

[1,2,3,4]

2)create a custom output variable of the component like this:

 set the component's varvalue:

Dropdown2.Selected.Value

2)outside the component, inside the app

insert this component and insert a toggle

set the toggle's Default:

If(Component1_1.varvalue=1||Component1_1.varvalue=2,true,false)

set the toggle's OnCheck:

Set(BUILDING,"value1")

 set the toggle's OnUncheck:

Set(BUILDING,"value2")

set the toggle's Visible:

false

Then if you choose 1or2 in that drop down, the toggle will be true and you will set BUILDING to value1.

If you choose 3or4 in that drop down, the toggle will be true and you will set BUILDING to value2.

What's more, if you want to set BUILDING to more than two values, I suggest you put that drop down outside the component.

Except using toggle, I'm afraid there's no better way to use control inside component to trigger action.

Best regards,

[Humanity]

I believe I understand everything except this part:

 set the component's varvalue:

Dropdown2.Selected.Value