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Readme

react-maskinput

DEMO: https://xnimorz.github.io/masked-input/

Mask input with simple API and rich customization.

You often have to create input for a credit card, phone number, birthday, etc. Each of this usecases requires to input value with some formatting (for example 0000-0000-000-0000 for credit card).

react mask input could solve this problem without the tears.

Installation

npm install --save react-maskinput

or if you use yarn

yarn add react-maskinput

Usage

You can try all of this examples here: https://xnimorz.github.io/masked-input/

The most simple usage is a credit card (click to the show code button):

import MaskInput from 'react-maskinput';

<MaskInput alwaysShowMask maskChar="_" mask="0000-0000-0000-0000" size={20} />;

Other use cases:

All this examples you can try here: https://xnimorz.github.io/masked-input/

Credit card:

All props you can change right during the runtime. Credit card with automatic switching between visa and american express format (for amex format write 34 or 37):

import MaskInput from 'react-maskinput';
const [mask, setMask] = React.useState('0000-0000-0000-0000');

const onChange = e => {
  if (e.target.value.indexOf('34') === 0 || e.target.value.indexOf('37') === 0) {
    setMask('0000-000000-00000');
    return;
  }

  setMask('0000-0000-0000-0000');
};

<MaskInput onChange={onChange} maskChar="_" mask={mask} alwaysShowMask size={20} />;

Date

Date input with custom year (2 or 4 numbers):

import MaskInput from 'react-maskinput';
const [mask, setMask] = React.useState('00.00.0000');
const [maskString, setMaskString] = React.useState('DD.MM.YYYY');
const onChange = e => {
  if (parseInt(e.target.value[6], 10) > 2) {
    setMaskString('DD.MM.YY');
    setMask('00.00.00');
  } else {
    setMaskString('DD.MM.YYYY');
    setMask('00.00.0000');
  }
};
<MaskInput alwaysShowMask onChange={onChange} maskString={maskString} mask={mask} size={20} />;

You can use any regular input fields, like placeholder:

import MaskInput from 'react-maskinput';
const [mask, setMask] = React.useState('00.00.0000');
const [maskString, setMaskString] = React.useState('DD.MM.YYYY');
const onChange = e => {
  if (parseInt(e.target.value[6], 10) > 2) {
    setMaskString('DD.MM.YY');
    setMask('00.00.00');
  } else {
    setMaskString('DD.MM.YYYY');
    setMask('00.00.0000');
  }
};
<MaskInput
  onChange={onChange}
  maskString={maskString}
  mask={mask}
  size={35}
  showMask
  placeholder="Enter your birthdate DD.MM.YYYY"
/>;

Phone:

The USA phone format:

import MaskInput from 'react-maskinput';

<MaskInput
  alwaysShowMask
  mask={'+1 (000) 000 - 0000'}
  size={20}
  showMask
  maskChar="_"
  placeholder="Enter your birthdate DD.MM.YYYY"
/>;

Customization:

You can use defaultValue to set up componant as uncontrolled input:

import MaskInput from 'react-maskinput';

<MaskInput alwaysShowMask maskChar="_" mask="0000-{0}-0000" defaultValue="123456789" />;

In onChange | onChangeValue callback you can receive on processing value. This example also shows how to create controlled input:

import MaskInput from 'react-maskinput';
const [onChange, setOnChange] = React.useState('');
const [onValueChange, setOnValueChange] = React.useState('');
<div>
  <p>Value from onChange event is: "{onChange}"</p>
  <p>Value from onChange with replace is: "{onChange.replace('-', '')}"</p>
  <p>maskedValue from onValueChange is: "{onValueChange.maskedValue}"</p>
  <p>Value from onValueChange is: "{onValueChange.value}"</p>
  <MaskInput
    onChange={e => setOnChange(e.target.value)}
    onValueChange={setOnValueChange}
    mask={'0000-0000'}
    value={onChange}
    size={20}
  />
</div>;

Custom classes:

import MaskInput from 'react-maskinput';
<MaskInput className="custom-input" alwaysShowMask maskString="0000-(TEXT)-0000" mask="0000-(aaaa)-0000" />;

Get HTMLElement from the component:

import MaskInput from 'react-maskinput';
const [el, setEl] = React.useState(null);
<div>
  <p>
    <code>el is: `{el && el.outerHTML}`</code>
  </p>
  <MaskInput
    getReference={el => setEl(el)} /* Now in el is storing input HtmlElement */
    alwaysShowMask
    size={20}
    maskChar="_"
    mask="0000-0000-0000"
  />
</div>;

Props

List of specific react-maskinput props:

mask: String. Format:

   0 — any number 0-9
   * — any symbol
   a — A-Z, a-z
   q — "q" letter, 2 — "2" letter etc.
   \a — "a" letter
 default is undefined

[function] reformat: user function, if you want use custom reformat logic. It's userfull for numeric inputs, decimal numbers, emails, etc. If reformat defined mask will be ignored. Reformat function must receive object with several fields:

function reformat({value: string, selection: {start, end}, input: string}) {
    // realization

    return {
        [any] value: // value that stored and called in input core functions (such as reformat). Field may have any format,
        [String] visibleValue: // value that displayed to user in input if showMask is false,
        [String] maskedValue: // value that  displayed to user in input if showMask is true,
        [{[integer] start, [integer] end}] selection: {start, end} — // new selection range
    }
}

If reformat and mask is undefined, input allows to enter any values.

You can define custom mask by passing maskFormat. This prop must be an array, each object in array have several fields:

str: matched char for mask
regexp: validation rule as regexp
type: special

maskChar: Character to cover unfilled editable parts of mask. Default value is ''. maskString: String to cover unfilled editable parts of mask. Default is undefined. If maskString define maskChar ignored.

showMask: show mask in input. It's possible only if mask have not cyclic. Default value = false alwaysShowMask: show mask when input inactive

Callbacks: onChange(event). Event is synthetic react-event. If you want access to input value, you may use: event.target.value
onValueChange(event). fires, when value was changed. Provides 2 fields: value and maskedValue getReference: Callback to get native input ref

License

MIT

Changelog

3.0.0

The code of react-maskinput was rewritten to react hooks. It should be compatible with the prevoius version (2.x), but in some complicated cases behavior could be changed.