Do not implement numeric input with like this Post NL user interface
Posted by jpluimers on 2026/01/14
I had to pick up a package keying in a 6 digit code using the below PostNL UI.
It was horrible. Don’t implement your numeric input UI like this: use a telephone keypad like or calculator numpad like keypad UI.
Number input not by keypad, but buttons in two rows:- 1 2 3 4 5 <X – 6 7 8 9 0 The <X functions as back-space
Source: my tweet [WaybackSave/Archive] Jeroen Wiert Pluimers @wiert@mastodon.social on X: “Numeric input when you try to get a package from @PostNL Not a real @KevlinHenney, but a gross UI design violation.”
Usable keypad layouts
The back-space key can for instance be next to the input field or an unused key from the layouts below:
| Telephone keypad | Numeric keypad part of an extended keyboard | Calculator keypad |
|---|---|---|
 |
 |
 |
--jeroen
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