Prevent user from typing spaces

Questions about Thunkable
1

Hey, I wanted to know if there was a way to prevent the user to enter only spaces in a textinput. Thanks !

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2

You can replace text when user it button then
Replace text of textbox « » (Space) by empty string

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3

It will save the value he entered without spaces right ?

4

True!

But you can add blocks like :
If textbox text is empty then show a notifier

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