Table of Contents

• Installation
• Usage
• Masking Types
  • Static Masking Type
  • Optional Masking Type
  • Dynamic Masking Type
  • Alias Masking Type
  • Alternator Masking Type
  • Preprocessing Masking Type

Features

• 🎯 Simple API
• 💎 Works like a charm with Next.js
• ✨ Compatible with React Hook Form
• 🏁 Compatible with React Final Form

Install

npm i use-mask-input

Quickstart

import React from 'react'
import { withMask } from 'use-mask-input';

const App = () => {
  return (
    <input type="text" ref={withMask('9999-9999')} />
  )
}

Usage with React Hook Forms

import React from 'react';
import { useForm } from 'react-hook-form';
import { useHookFormMask } from 'use-mask-input';

function App() {
  const { register, handleSubmit } = useForm();
  const registerWithMask = useHookFormMask(register);

  ...

  return (
    <form onSubmit={onSubmit}>
      <input
        {...registerWithMask("phone", ['99 9999-9999', '99999-9999'], {
          required: true
        })}
        type="text"
      />
      <button type="submit">Submit</button>
    </form>
  );
}

Usage with React Final Form

Just use withMask normaly.

import React from 'react';
import { Form, Field } from 'react-final-form';
import { withMask } from 'use-mask-input';

function App() {
  ...
  return (
    <Form
      onSubmit={onSubmit}
      render={({ handleSubmit }) => (
        <form onSubmit={handleSubmit}>
          <Field
            name="phone"
            render={({ input, meta }) => (
              <input ref={withMask('9999-9999')} {...input} />
            )}
          />
          <button type="submit">Submit</button>
        </form>
      )}
    />
  );
}

Masking types

The mask params can be

Static Masking Type

These are the very basics of masking. The mask is defined and will not change during the input.

<input
  {...registerWithMask("phone", '99 9999-9999')}
  type="text"
/>

Optional Masking Type

It is possible to define some parts in the mask as optional. This is done by using [ ]. By example:

<input
  {...registerWithMask("phone", '99 [9]9999-9999')}
  type="text"
/>

This mask will allow input like (99) 99999-9999 or (99) 9999-9999.

Dynamic Masking Type

Dynamic masks can change during input. To define a dynamic part use { }.

{n} => n repeats {n|j} => n repeats, with j jitmasking {n,m} => from n to m repeats {n,m|j} => from n to m repeats, with j jitmasking

Also {+} and {} is allowed. + start from 1 and start from 0.

By example:

//static mask with dynamic syntax
<input
  {...registerWithMask("phone", "aa-9{4}")}
  type="text"
/>

// dynamic mask ~ the 9 def can be occur 1 to 4 times
<input
  {...registerWithMask("phone", "aa-9{4}")}
  type="text"
/>

// dynamic mask ~ email
<input
  {...registerWithMask("phone", "*{1,20}[.*{1,20}][.*{1,20}][.*{1,20}]@*{1,20}[.*{2,6}][.*{1,2}]")}
  type="text"
/>

Alias Masking Type

A Lot of common default "aliases" presets, you can use like that:

<input                         // the alias
  {...registerWithMask("date", "datetime", {
    inputFormat: "yyyy-mm-dd",
  })}
  type="text"
/>

You can use together with options like inputFormat, prefix, suffix, etc. Checkout API docs

The avaliable ones is:

• datetime
• email
• ip
• datetime
• cpf
• email
• numeric
• currency
• decimal
• integer
• percentage
• url
• ip
• mac
• ssn

Alternator Masking Type

The alternator syntax is like an OR statement. The mask can be one of the 3 choices specified in the alternator.

To define an alternator use the |. ex: "a|9" => a or 9 "(aaa)|(999)" => aaa or 999 "(aaa|999|9AA)" => aaa or 999 or 9AA "aaaa|9999" => aaa a or 9 999

<input
  {...registerWithMask("phone", "9999-9999|99999-9999")}
  type="text"
/>

// or just passing an array
<input
  {...registerWithMask("phone", ["9999-9999", "99999-9999"])}
  type="text"
/>

Preprocessing Masking Type

You can define the mask as a function that can allow you to preprocess the resulting mask. Example sorting for multiple masks or retrieving mask definitions dynamically through ajax. The preprocessing fn should return a valid mask definition.

<input
  {...registerWithMask("phone", function () {
    /* do stuff */ return ["[1-]AAA-999", "[1-]999-AAA"];
  })}
  type="text"
/>

API

(TODO)