How to set the number of letters that can be entered in the text url

excuse me, I want to set the number of letters that can be entered in the text url.

Welcome!
Unfortunately I do not understand, please elaborate…
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Taifun

Use length block from text part

When text box text changed, 
If the length text box text is greater than or equal to {enter number}
Then add your logic 
Else {this part is the length is not reached the desired amount}

thanks, i will try it

See by this way user can enter only lenth of 5 texts in textbox1 (includs number, texts, space, …)
image
If it crosses that lenth then keyboard will hide