[Feature] Add auto-resizing textarea widget with character counter

[maxim-f1]

Description

This PR introduces a new auto-resizing textarea widget with a dynamic character counter and maximum character validation.

Key Features

• Dynamic Auto-Resizing: The textarea automatically adjusts its height dynamically when new lines are added or removed during input events.
• Character Counter: Displays the current character count alongside the maxLength limit (e.g., 140 / 400).
• Visual Validation & Input Blocking:
  • The counter highlights in redimmediately when the user reaches the maximum allowed character threshold.
  • Further text entry is blocked once the limit is hit to prevent invalid data submission.
• Compatible with SQLAlchemy's Text, BinaryLarge, and Binary types

[mmzeynalli]

This is a nice feature!

However, can we:

1. Update with main?
2. Have auto-resize as a parameter? Maybe I have really long text. I would like a char count, but with auto-resize, it would take the whole page?
3. Can we also add a word count? I think all of them should be passed as params, with char count being true by default.

[maxim-f1]

2. Have auto-resize as a parameter? Maybe I have really long text. I would like a char count, but with auto-resize, it would take the whole page?

You can still shrink the input so it doesn't take up too much space. But if you start typing, it will expand again to fit everything.

[maxim-f1]

2. Have auto-resize as a parameter?

Yes, it will need some improvement.

[maxim-f1]

3. Can we also add a word count? I think all of them should be passed as params, with char count being true by default.

Theoretically, it could be added, but I'm not sure for what use cases. Databases usually have a character limit out of the box. The number of words is a fairly narrow case, so I'm not sure it'll be useful.

[maxim-f1]

This can be done via form_args

  form_args = {
      'text_without_limit': {
          'show_chars_count': False
      }
  }

[mmzeynalli]

Okay, lets skip word count, you are right.

But I still insists auto_resize should be also a param like show_chars_count. Make default true, but, still user should be able to cusomize it.

[mmzeynalli]

Also, is there a chance to have it "default" field for Text type?

Mapped[str] = mapped_column(String) -> StringField
Mapped[str] = mapped_column(Text) -> TextField

[mmzeynalli]

This happens even when class_ is None. Skip instead.

[mmzeynalli]

why not widgets.TextArea?

[mmzeynalli]

I think in this case you can downsize call override

[mmzeynalli]

typo

[mmzeynalli]

@maxim-f1 Hey, I plan to release new version tomorrow or day after, could you finalize this as well?

[maxim-f1]

Also, is there a chance to have it "default" field for Text type?

In this case, all text fields will become textareas instead of input fields. It seems this behavior is not expected for short strings of the String CHAR type.

[mmzeynalli]

Yes, I suspected that, and was wondering if we can "separate" input from textarea

[maxim-f1]

In my opinion, it is better to make a separate widget for String and CHAR in another MR