App Inventor Extensions

Textbox Extension

See the App Inventor Extensions document about how to use an App Inventor Extension.

For questions about this extension or bug reports please start a new thread in the App Inventor Extensions forum. Thank you.

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Sep 27th, 2017: Version 1: initial version

Sep 28th, 2017: Version 2: parameter component added in AfterTextChanged event


Textbox Extension.

Required permission: none
Sponsor of this extension is Italo. Thank you!


Return current position of cursor in textbox.

Highlight text.

Return length of textbox.

Set cursor at a specific position in textbox.

Set cursor at end position in textbox.

Start Text Changed listener.


Event indicating that text of component has been changed.

Example Use


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I can help you: for one hour I charge 25 USD.
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Terms and Conditions


Developing and maintaining snippets, tutorials and extensions for App Inventor takes a lot of time.
I hope it saved some of your time. If yes, then you might consider to donate a small amount!

Donation amount:

or donate some mBTC to Bitcoin Address:

Thank you! Taifun

Download TaifunTextbox extension (aix file)
Download Textbox Test (aia file)

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Creative Commons License
This work by Pura Vida Apps is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License
with attribution (name=Pura Vida Apps and link to the source site) required.

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