missing the last word while input 2-byte letters

Cause

A common issue across various applications is the phenomenon where the last character is dropped when entering Korean or other double-byte characters in an input field. This often occurs due to Input Method Editor (IME) composition issues.

While this can be temporarily resolved by entering a non-character key (such as an arrow key or document key), this workaround is inconvenient for users.

Angular addresses this problem by providing COMPOSITION_BUFFER_MODE within the @angular/forms module.

Solution

Set the COMPOSITION_BUFFER_MODE within the initial execution module (typically app.module.ts).

Under Angular 17

import { COMPOSITION_BUFFER_MODE } from '@angular/forms';
...

@NgModule({
    providers: [
        { provide: COMPOSITION_BUFFER_MODE, useValue: false }
    ]
})

...

Angular 17+

// src/app/app.config.ts

import { ApplicationConfig } from '@angular/core';
import { provideRouter } from '@angular/router';
import { COMPOSITION_BUFFER_MODE } from '@angular/forms';

import { routes } from './app.routes';

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes),

    { provide: COMPOSITION_BUFFER_MODE, useValue: false }
  ]
};

This configuration is briefly described on the official Angular website, as follows:

Provide this token to control if form directives buffer IME input until the "compositionend" event occurs.

Disabling the composition buffer mode resolves the lost character issue.

References

• Input Text Cut-off Issue When Typing Korean
• COMPOSITION_BUFFER_MODE