A real-world debugging story of PrimeNG's p-inputOtp clashing with popular phonetic keyboards like Ridmik, plus handling ghost intervals in Angular.
As frontend developers, we always strive to build smooth, frictionless verification experiences. Recently, while working on a local bus ticketing platform, I implemented a 6-digit OTP verification system using PrimeNG v17's <p-inputOtp> component.
Everything looked flawless on desktop browsers and standard mobile emulators using Google Gboard. However, once we hit real-world production testing, we stumbled upon a major user accessibility blocker and a sneaky timer bug that could easily slip past your standard QA pipeline.
If you are developing web apps for regions with high adoption of custom/phonetic third-party keyboards (like Ridmik Keyboard in Bangladesh), here is what you need to know.
The "Ghost Input" Problem with Phonetic Keyboards
The Symptom
Users utilizing the standard Google Gboard could type their OTP perfectly. But users utilizing the highly popular Ridmik Keyboard couldn't input a single digit into the OTP boxes. The keys registered on their keyboard, but the input fields stayed entirely blank.
The Root Cause
Phonetic keyboards like Ridmik rely heavily on an IME (Input Method Editor) composition buffer. Instead of firing a clean, immediate keydown event with a concrete value like Gboard does, they fire text composition events (compositionstart, compositionend).
By default, PrimeNG's <p-inputOtp> component ships with [integerOnly]="true". This directive aggressively intercepts standard keydown events to validate digits and instantly shifts focus to the next input box. Because it moves focus before the IME(Input Method Editor) finishes composing the character, the input is completely dropped in transition.
The Solution
We need to ease up on the strict keydown interception and let the browser's native numeric input handling do the heavy lifting.
Simply remove [integerOnly]="true" (or set it to false) and enforce inputmode="numeric". This forces mobile devices to present the native number pad while giving phonetic keyboards the buffer space they need to insert characters safely.
<!-- Before -->
<p-inputOtp [(ngModel)]="otpCode" [length]="6" [integerOnly]="true">
</p-inputOtp>
<!-- After (Fixed) -->
<p-inputOtp
[(ngModel)]="otpCode"
[length]="6"
[integerOnly]="false"
inputmode="numeric">
</p-inputOtp>
Testing strictly on standard emulators or default operating system configurations often masks deep, localized accessibility issues. Building software for global or specific regional markets means intentionally checking how your UI interactives play with localized tools—like third-party keyboards—that your actual user base interacts with daily.
Have you ever run into a bizarre keyboard or input composition compatibility bug in production? Drop a comment below and share your debugging horror story!
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