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Updating a variable

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Posted on by Mats_1997

In my app I have a drop down with a list of values 1-20. the drop down's on change is Set(y,<nameOfDropDown>.SelectedText), which is fine. The thing is that when I go to that screen, y is not yet set, so y has a 0 value, which is not good for the rest of what's going on in the screen.

I tried setting the default value of the box to 1, but I get why that doesn't work, which leads to my issue. I tried to set the screens OnVisible to be Set(y, 1) kinda like you would do with a variable in any other programing language. The dropdown box declaration y was however not so happy with that, causing a whole string of errors with multiple declarations...

My question then is. how do I make a variable with an initial value, and then change it to later to be what you select in the dropdown box?

btw, I have tried using UpdateContext too to keep it local, which would be best practice, buut, it didn't change anything.

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eka24 20,925 on at

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With Set(y,<nameOfDropDown>.SelectedText), Can you give the Items formula of the Dropdown. That will determine what will go into the variable.
However, try OnVisible of the screen: Set(y,nameOfDropDown.Selected.Value
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Mats_1997 62 on at

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@eka24

That solves the initializing problem, but I could just as well have used Set(y, 1), it does not make the y value change when you change the value of the drop down 😕

I'd like something similar to
screen OnVisible: Set(y, 1)
dropdown Onchange: Update(y, dropdown.SelectedText)

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eka24 20,925 on at

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Please show the items of the dropdown to help solve the issue
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Mats_1997 62 on at

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Like I said in my OP, I filed it with an array of int 1-20 ^^. The issue is that, yes, I can initialize a value in the screens OnVisible function like this: Set(y, dropdown.Selected.value), which will initially set it to 1 as is desired, but, it won't dynamically change the value in the dropdown. I also can't use go to the dropdowns onChange function and write Set(y, dropdown.selected.value) to dynamically uppdate y...

So I wonder how can I initialize a varable AND dynamically uppdate it as changes are made to the dropdown

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eka24 20,925 on at

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You can set a variable OnChange of the Dropdown:
Set(YY,Dropdown2.SelectedText.Value)
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Mats_1997 62 on at

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@eka24

I'm sorry, I think I'm not explaining properly
I have a variable y, that needs to start as 1, but change to be something else when I change the drop down. the variable value needs to change from when it is initialized

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Mats_1997 62 on at

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I have no idea why, suddenly it just worked, with the screens onSelect being Set(y,1) and the dropDown Onchange being Set(y, MyDropDown.Selected.Value) almost as @eka24 suggested, no idea why it suddenly worked, because it didn't work the first time I tried it

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