Masked input

Pattern-masked text input. The field shows a formatted display string; onValueChange / v-model receive the raw alphanumeric characters kept by the mask (# digits, A letters, * alphanumeric; other characters are literals).

PreviewMasked display

Phone

Usage

React

import { useState } from "react";
import { MaskedInput } from "@sometic/react/input";

export function Example() {
    const [raw, setRaw] = useState("");
    return (
        <MaskedInput mask="(###) ###-####" value={raw} onValueChange={setRaw} placeholder="Phone" />
    );
}

Vue

<script setup>
import { ref } from "vue";
import { MaskedInput } from "@sometic/vue/input";

const raw = ref("");
</script>

<template>
    <MaskedInput v-model="raw" mask="(###) ###-####" placeholder="Phone" />
</template>

Vanilla

import { createMaskedInputController } from "@sometic/dom/input-masked";

const input = document.querySelector("input");
const controller = createMaskedInputController({
    mask: "(###) ###-####",
    defaultValue: "",
    onValueChange(next) {
        console.log(next);
    },
});

const apply = () => {
    input.value = controller.getDisplayValue();
};
apply();

input.addEventListener("input", () => {
    controller.setFromDisplay(input.value);
    apply();
});

Custom Elements (Web Components)

<script type="module">
    import { registerInputElements } from "@sometic/elements/input";
    registerInputElements();
</script>

<sometic-masked-input mask="(###) ###-####" placeholder="Phone"></sometic-masked-input>

CDN Simple

<script src="https://cdn.jsdelivr.net/npm/@sometic/elements@1.1.6/dist/cdn/sometic-elements.iife.js"></script>

<sometic-masked-input mask="(###) ###-####" placeholder="Phone"></sometic-masked-input>

CDN Module

<script
    type="module"
    src="https://cdn.jsdelivr.net/npm/@sometic/elements@1.1.6/dist/cdn/sometic-elements.esm.js"
></script>

<sometic-masked-input mask="(###) ###-####" placeholder="Phone"></sometic-masked-input>

Vue

<script setup>
import { ref } from "vue";
import { MaskedInput } from "@sometic/vue/input";

const raw = ref("");
</script>

<template>
    <MaskedInput v-model="raw" mask="(###) ###-####" placeholder="Phone" />
</template>

How it works

1. Engine (@sometic/dom/input-masked): parseMask / formatMasked map raw characters onto mask tokens. createMaskedInputController holds controllable raw string state and resolves display via resolveInput (type: "text").
2. Adapters: React MaskedInput requires mask: string; controlled value is raw. On change it strips to alphanumeric, then keeps only characters that fit the mask (formatMasked(...).raw). Vue mirrors with required mask and v-model (raw).
3. Custom element: sometic-masked-input observes mask, value, disabled, readonly, invalid, placeholder, shadow, syncs the display string into a light-DOM <input>, and dispatches value-change with { value } (raw).

Masking is formatting, not validation or a security boundary.

Anatomy

Part	Role
Native input	Shows masked display; app owns raw

State attributes follow Input: data-disabled, data-readonly, data-invalid, data-filled, data-empty, optional data-size / data-variant.

Props / attributes

React MaskedInputProps

Omit<InputProps, "type" | "value" | "defaultValue"> plus:

Prop	Type	Default	Description
mask	string	required	Pattern tokens
value	string	,	Controlled raw value
defaultValue	string	,	Uncontrolled initial raw
onValueChange	(raw: string) => void	,	Emits raw characters
disabled	boolean	false	Disables input
readonly	boolean	false	Read-only
invalid	boolean	false	Invalid + aria-invalid
name / placeholder	string	,	Native association / hint
styling props	from Input	,	unstyled, classes, …
Native attrs	remaining input HTML attrs	,	Forwarded; ref supported

Vue

Required mask, modelValue (raw string), disabled, readonly. Emits update:modelValue with raw. Use v-model.

Custom element (sometic-masked-input)

Observed: mask, value, disabled, readonly, invalid, placeholder, shadow. Event: value-change → { value: string } (raw).

Events / callbacks

Surface	Event	Payload
React	onValueChange	raw string
Vue	update:modelValue	raw string
Custom element	value-change	{ value }

Callbacks are ignored while disabled or readonly on the adapter path. Display string is never the event payload.

Controlled vs uncontrolled

Same pattern as Input, but the controlled value is raw, not display:

• Controlled: pass value (raw) + onValueChange.
• Uncontrolled: omit value, optional defaultValue.
• Vue: v-model binds raw.

Form participation

Native name posts whatever is in the DOM input (display). Prefer reading Sometic raw state (or formatting on submit) when validating or storing. Pair with @sometic/validation on the raw string inside Form.

Accessibility

• Label via Field; describe the expected format in description text (“US phone: (555) 123-4567”).
• Masking does not replace validation; set invalid + error text when rules fail.
• Keyboard behavior is native text input (Tab, caret, selection).
• Do not use the mask as the only error announcement; use Field / live regions for failures.

Styling

Same input state attrs. Example:

<MaskedInput mask="###-##-####" unstyled classes={{ root: "field-control" }} invalid={hasError} />

Edge cases

• Incomplete input, raw may be shorter than the pattern; display stops filling tokens.
• Paste, alphanumeric characters are filtered then applied to the mask; excess is dropped by token walk.
• Mask tokens, # = digit, A = letter, * = alphanumeric; everything else is a literal.
• React strip vs CE controller, React adapters filter to [a-zA-Z0-9] before formatMasked; prefer the same mask tokens your CE demos use.
• Not security, never treat masking as sanitization for secrets.
• SSR, format helpers are pure; register the CE only in the browser.

Performance notes

formatMasked runs on each change. Keep masks modest in length. Import @sometic/react/input (or Vue/elements/dom masked subpaths) so unused specialized inputs tree-shake.

When to use / When not

Use for fixed patterns such as phone, ZIP, and simple ID formats.

Do not use for:

• Money amounts, Currency input.
• Unitless numbers, Number input.
• Free text or schema-only validation without display formatting, Input.

FAQ

Display vs raw? The UI shows the masked display; callbacks and controlled value use raw kept characters.

What are the mask tokens? # digit, A letter, * alphanumeric; other characters are literals (for example (, ), -, spaces).

Does paste work? Yes. Pasted text is filtered and walked through the mask; only matching characters are kept.

Is the mask validation? No. Pair raw output with @sometic/validation or your Form validators.

Why not CurrencyInput? Currency needs Intl formatting and numeric number | null values, not digit literals in a fixed pattern.

Can I change mask at runtime? Yes on CE (rebuilds controller) and React/Vue (re-format from current raw). Prefer stable masks per field to avoid surprising caret jumps.

Controlled empty string? value="" is controlled empty raw, not uncontrolled.

Ref forwarding? React forwards ref to the underlying <input>.

Light DOM or shadow? Light DOM default; shadow on the CE isolates styles.

Bundle tip? Import from @sometic/react/input or @sometic/dom/input-masked, not a mega barrel.

Related links

• Input
• Currency input
• Field
• Form
• Styling slots