How can i make Clock notify once only everytime text changed and then close?

MIT App Inventor Help
2

Remove itoo, this is no background task
and use the TextChanged event from the textbox itself

http://ai2.appinventor.mit.edu/reference/components/userinterface.html#TextBox

TextChanged()
Event raised when the text of the TextBox is changed, either by the user or the program.

Taifun

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Help notifying a notification only once