How do I set only capital letters in textbox?

i need to type only capital letters in textbox. what i do for that help me fast

You cant do with an appinventor textbox. But you can check if the enterbutton is pressed with this extension. :wink:

Try this-
blocks (12)

TaifunTextbox Extension download-

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help me to find "TaifunTextbox1"
so iam a beginner

This is the link-

when Textbox1.AfterTextChanged
set Textbox1.Text to (upcase (Textbox1.Text))

Kevin, do you tested it ?

My solution

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Sorry, my bad. my blocks not tested, which will cause stackOverFlow error