How to accept only number in the flet textfield ?

[noob-infinity]

Hi,

I want to know how to make a textfield in flet that accept only number . I have used attribute keyboard_type=ft.KeyboardType.NUMBER, however it is not working.

Please suggest.

Thanks in advance.

[niuniudd]

You can use:max_length=1

[noob-infinity]

First all,length of the input will vary much hence I don't want to set max length length.Even if set the max length,the textfield is still accepting non numeric character.

[niuniudd]

You can check e.data in event method

[ndonkoHenri]

At the moment Flet doesn't have an ideal way to do this. There were several tries for this using on_change to filter the keyboard inputs. These tries weren't that ideal and the result wasn't that user friendly (one could see the typed non-numeric character being entered and later on removed).

Good to mention: the effect of type could be better observed on mobile. Mobile devices have different type of keyboards (one for normal text, one for numbers only, email...etc) and depending on the type value you set, the appropriate keyboard type is then shown.