[F/OS] 📖 TextChanged - Detect Text Changes For Your Components!

:computer: Introduction

A non-visible extension to detect the changed text of a visible component, for example, TextBox or Button.

:package: Package name: com.gordonlu.textchanged.aix

:clock1: Version: 1

:date: Release date: 2022-03-21T10:00:00Z

:fountain_pen: Supports:

  • User Interface: Button, Checkbox, DatePicker, Label, ListPicker, PasswordTextBox, Switch, TextBox, TimePicker.

  • Media: ImagePicker

  • Social: ContactPicker, EmailPicker, PhoneNumberPicker

If you look in the Android Developers documentation for EditText (TextBox) and Button, you will see that they are all subclasses of TextView (Label), so technically, Button = TextView.

There might be a Clock solution for this, but when your app gets bigger and bigger, you don't want to check text changed events for 10 times or have 10 Clocks in your app.

:open_book: Documentation

Event blocks

OnTextChanged

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This event is invoked when a component's text is changed.

Parameters: component = component

Method blocks

AddTextChangedListener

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Listenes to text changed events for the given component and fires the OnTextChanged event when necessary.

Parameters: component = component

:inbox_tray: Downloads

AIX: com.gordonlu.textchanged.aix (7.1 KB)

:clipboard: Open Source

This extension is open source in GitHub.

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Made with Niotron IDE.

Kindly :email: PM me if you have any questions! Also, if you like my extension, please :heart: like it! It takes some effort for me to make it...

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Gordon Lu

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8 Likes

In what circumstance the txt of Button will change by users and need a textchange event?
And there is a similar extension from Taifun i think.

Yes, Taifun's TextBox extension has that, but that only supports TextBoxes (2.3%). This supports 14.8% of all components in App Inventor.

For example, when the user is in a login/logout app, and you want to change the text of that login/logout app, that could be useful.

You can change the text of Button any time when you want, then this text-change event is triggered by your self, you will of course know when it's triggered, then why need another event block?

1 Like

That's an interesting question. That is not a problem for one component, but I find that an issue in some of my projects that use 40+ buttons and labels, and places that I have to change properties of components (including Text) several times. This extension is designed for projects that use a lot of components (and blocks). Remember - this extension also includes labels and textboxes.

Another reason that I made this is because of learning. This extension is open source right at the main post so that anyone can modify from the src code.

1 Like

Maybe we can add this event listener on all / some of components with one block, no need to add listener one by one.

great extension!! :+1:t3: :+1:t3:

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