OTP Input
Enter a verification code with automatic advance and paste support.
use blinc_cn as cn;
use blinc_core::reactive::{Signal, computed};
use blinc_layout::{binding::IntoReactive, prelude::*};
pub fn input_otp_demo(name: Signal<String>, disabled: Signal<bool>) -> Div {
let code = name;
div()
.class("demo-wide")
.child(cn::label("Verification code"))
.child(
cn::input_otp(code, 6)
.numeric_only(true)
.group_every(3)
.disabled(disabled),
)
.child(
bound_text(computed(move |g| {
format!("{} of 6 digits", g.get(code).unwrap_or_default().len())
}))
.class("demo-caption"),
)
}
fn bound_text(value: impl IntoReactive<String>) -> Text {
Text::bound(value.into_reactive())
}
@layer components {
.cn-input-otp-slot:disabled {
box-shadow: none;
}
.cn-input-otp-slot {
box-shadow: var(--shadow-sm);
background: var(--cn-input-bg, var(--input-bg));
border-color: var(--border);
border-radius: var(--radius-md);
color: var(--text-primary);
outline: 2px solid transparent;
outline-offset: 1px;
transition:
background-color var(--duration-fast) var(--ease-state),
border-color var(--duration-fast) var(--ease-state),
outline-color var(--duration-fast) var(--ease-state),
outline-offset var(--duration-fast) var(--ease-out);
}
.cn-input-otp-slot:focus:not(:disabled) {
outline: 2px solid var(--focus-ring);
outline-offset: 2px;
}
.cn-input-otp-slot.cn-input-otp-slot--error:not(:disabled),
.cn-input-otp-slot.cn-input-otp-slot--error:hover:not(:disabled),
.cn-input-otp-slot.cn-input-otp-slot--error:focus:not(:disabled) {
border-color: var(--border-error);
}
.cn-input-otp-slot.cn-input-otp-slot--error:focus:not(:disabled) {
outline: 2px solid var(--focus-ring-error);
}
.cn-input-otp--disabled {
opacity: 0.5;
}
}
Usage and properties
Enter a verification code with automatic advance and paste support. Apply CSS after the component layer to restyle the documented parts.
Use the installation guide to add blinc_cn and its component stylesheet. Create the fixture bindings once, and return the demo from your UI builder. Values marked Bound accept Signal/Computed sources where the API supports them; structural options configure the component at construction.
| Property | Type | Update model | This example |
|---|---|---|---|
value | Signal<String> | Bound | values.name |
length / group_every | usize | Construction | 6 / 3 |
numeric_only | bool | Construction | true |
disabled | bool or IntoReactive<bool> | Bound | values.disabled |
Keyboard and interaction
Use the control’s documented keyboard commands; Tab reaches enabled controls and :focus-visible marks keyboard focus.
Customizing it
Add application CSS after the default component layer. These selectors are the restyling surface for this component:
.cn-input-otp.cn-input-otp-slot.cn-input-otp-separator
Theme and component variables: --primary, --text-primary, --text-secondary, --surface, --border, --radius-default, --duration-fast, --ease-state.
Built-in themes
The Live theme control installs Blinc's own theme bundles, including their colours, focus rings, corner shapes and motion tokens.
pub fn theme_bundle_for(name: &str) -> blinc_theme::ThemeBundle {
match name {
"restrained" => blinc_theme::RestrainedTheme::bundle(),
"expressive" => blinc_theme::ExpressiveTheme::bundle(),
_ => blinc_theme::HybridTheme::bundle(),
}
.with_css(blinc_cn::cn_styles::CN_STYLES)
}Download the default widget and component stylesheets. Sample assets and licenses are available in the asset guide.
Documentation
From the canonical component guide.
Segmented one-time-code input:
use blinc::cn::prelude::*;
let code = ctx.use_signal(String::new());
cn::input_otp(code, 6)
.numeric_only(true)
.on_complete(|code| println!("complete code: {code}"))
OTP Options
Tab and Shift+Tab reach each enabled slot and continue to the controls before or after the OTP input. Typing still advances automatically, Backspace in an empty slot moves back, and pasting distributes the code across the slots. Disabled slots are skipped.
cn::input_otp(code, 6)
.numeric_only(true)
.masked(false)
.group_every(3)
.error(has_error) // a bool, Signal or Computed
Platforms and version
The component API is available in Blinc 0.6.0. The Live example runs in a dedicated worker and requires a compatible GPU surface. Preview and Code remain available when Live cannot start. The canvas has a descriptive label; a full screen-reader DOM mirror is not provided. The gallery integration is based on revision e2e55c24e078.
Recordings and live demos use the default Hybrid theme with bundled Noto Sans. The recording uses a 560 × 320 logical viewport at twice that resolution. Live follows its container and actual display density. Source base revision · Exact build source · Artifact versions and checksums · Font license.