Liste viewer : action after selecting an element of list?

I want to know how to have activity after selecting an element of list ?

There is a block listviewer itemclick as in the image below:
Do whatever you want to do within the block. Item is the selected Item. You can also reference the index of the selected item

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Yes! At a basic level, this is the logic to use with a list picker to make various actions happen

If item = X
Do this thing
Else if item = y
Do something else

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