@gruzf/mask-input
v2.0.9
Published
React masked input component
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GRUZF MaskInput
Input masking component for React. Made with attention to UX.
GRUZF MaskInput is written in
TypeScript
.
Table of Contents
Install
npm install @gruzf/mask-input
or
yarn add @gruzf/mask-input
:warning: @gruzf/mask-input requires React 16.8.0 or later.
Usage
import MaskInput from "@gruzf/mask-input";
import React from "react";
function DateInput(props) {
return (
<MaskInput
mask="99/99/9999"
onChange={props.onChange}
value={props.value}
/>
);
}
Properties
| Name | Type | Default | Description |
| :-------------------------------------------------------: | :-------------------------------: | :--------------------: | :------------------------------------------------------------------------------------------- |
| mask
| {String\|Array<String, RegExp>}
| "+7 (999) 999-99-99"
| Mask format |
| maskPlaceholder
| {String\|null}
| null
| Placeholder to cover unfilled parts of the mask |
| alwaysShowMask
| {Boolean}
| false
| Whether mask prefix and placeholder should be displayed when input is empty and has no focus |
| beforeMaskedStateChange
| {Function}
| | Function to modify value and selection before applying mask |
| unmask
| {Boolean}
| false
| Value format |
| fullFilled
| {Boolean}
| type==="tel"
| Value will be empty string until the user completely fills in the masked field. |
| onlyDigitAndLetter
| {Boolean}
| type==="tel"
| Value will contain only letters and digits |
| children
| {ReactElement}
| | Custom render function for integration with other input components |
And other InputHTMLAttributes that are passed to the <input/>
or to the passed children
wich contains <input/>
.
mask
Mask format. Can be either a string or array of characters and regular expressions.
Default mask: "+7 (999) 999-99-99"
.
If the mask
was not passed, the default input type
attribute will switch to 'tel'
<MaskInput mask="99/99/99" />
The same mask by regex array:
<MaskInput mask={[/\d/, /\d/, "\\", /\d/, /\d/, "\\", /\d/, /\d/]} />
| Character | Allowed input | | :-------: | :-----------: | | 9 | 0-9 | | a | a-z, A-Z | | * | 0-9, a-z, A-Z |
Any format character can be escaped with a backslash.
More complex masks can be defined as an array of regular expressions and constant characters.
// Canadian postal code mask
const firstLetter = /(?!.*[DFIOQU])[A-VXY]/i;
const letter = /(?!.*[DFIOQU])[A-Z]/i;
const digit = /[0-9]/;
const mask = [firstLetter, digit, letter, " ", digit, letter, digit];
return <MaskInput mask={mask} />;
maskPlaceholder
Default: null
Character or string to cover unfilled parts of the mask.
// Will be rendered as 12/--/--
<MaskInput mask="99/99/99" maskPlaceholder="-" value="12" />
// Will be rendered as 12/mm/yy
<MaskInput mask="99/99/99" maskPlaceholder="dd/mm/yy" value="12" />
// Will be rendered as 12/
<MaskInput mask="99/99/99" maskPlaceholder={null} value="12" />
alwaysShowMask
Default: false
If enabled, mask prefix and placeholder will be displayed even when input is empty and has no focus.
beforeMaskedStateChange
In case you need to customize masking behavior, you can provide beforeMaskedStateChange
function to change masked value and cursor position before it's applied to the input.
It receieves an object with previousState
, currentState
and nextState
properties. Each state is an object with value
and selection
properites where value
is a string and selection is an object containing start
and end
positions of the selection.
- previousState: Input state before change. Only defined on
change
event. - currentState: Current raw input state. Not defined during component render.
- nextState: Input state with applied mask. Contains
value
andselection
fields.
Selection positions will be null
if input isn't focused and during rendering.
beforeMaskedStateChange
must return a new state with value
and selection
.
// Trim trailing slashes
function beforeMaskedStateChange({ nextState }) {
let { value } = nextState;
if (value.endsWith("/")) {
value = value.slice(0, -1);
}
return {
...nextState,
value
};
}
return <MaskInput mask="99/99/99" beforeMaskedStateChange={beforeMaskedStateChange} />;
import MaskInput, { BeforeMaskedStateChangeStates } from "@gruzf/mask-input";
let mask = [/[0-2]/, /\d/, ":", /[0-5]/, /\d/];
// Timer input like "12:59"
const beforeMaskedStateChange = (states: BeforeMaskedStateChangeStates) => {
let { value, selection } = states.nextState;
if (value.startsWith("2")) {
mask[1] = /[0-3]/;
} // To block 24, 25, etc.
else {
mask[1] = /\d/;
} // To allow 05, 12, etc.
return { value, selection };
};
return <MaskInput mask={mask} beforeMaskedStateChange={beforeMaskedStateChange} />;
Please note that beforeMaskedStateChange
executes more often than onChange
and must be pure.
unmask
Default: false
If enabled, displayed value will be with mask, but input value will be without mask.
false:
// default mask: "+7 (999) 999-99-99" // passed value: "+7 (123) 456-78-90" // displayed value: "+7 (123) 456-78-90" // input value: "+7 (123) 456-78-90" return <MaskInput value="+7 (123) 456-78-90"/>
true:
// default mask: "+7 (999) 999-99-99" // passed value: "+7 (123) 456-78-90" // displayed value: "+7 (123) 456-78-90" // input value: "1234567890" return <MaskInput value="+7 (123) 456-78-90" unmask/>
fullFilled
Default: prop type
=== "tel"
If enabled, input value will be empty string until the user completely fills in the masked field.
false:
// type !== "tel" => fullFilled={false} // displayed value: "1234 567" // input value: "1234 567" return <MaskInput mask={"9999 9999 9999 9999"} value="1234567" />
true:
- not filled
// displayed value: "1234 567" // input value: "" return <MaskInput mask={"9999 9999 9999 9999"} value="1234567" fullFilled/>
- full filled
// displayed value: "1234 5678 9012 3456" // input value: "1234 5678 9012 3456" return <MaskInput mask={"9999 9999 9999 9999"} value="1234567890123456" fullFilled/>
- not filled
onlyDigitAndLetter
Default: prop type
=== "tel"
If enabled, input value will contain only digits and letters.
// default mask: "+7 (999) 999-99-99"
// passed value: "+7 (123) 456-78-90"
// displayed value: "+7 (123) 456-78-90"
// onlyDigitAndLetter = true because prop `type` === "tel"
// input value: "71234567890"
return <MaskInput value="+7 (123) 456-78-90"/>
// passed value: "--74_vg_R"
// displayed value: "--74_vg_R"
// input value: ""74vgR""
return <MaskInput mask="--99_aa_*" value="--74_vg_R" onlyDigitAndLetter/>
children
To use another component instead of regular <input />
provide it as children. The following properties, if used, should always be defined on the MaskInput
component itself: onChange
, onMouseDown
, onFocus
, onBlur
, value
, disabled
, readOnly
.
import MaskInput from "@gruzf/mask-input";
import { TextField } from "@mui/material";
import React from "react";
// Will work fine
function Input(props) {
return (
<MaskInput
mask="99/99/9999"
value={props.value}
onChange={props.onChange}
type="tel"
>
<TextField size="small" variant="filled" />
</MaskInput>
);
}
// Will throw an error because MaskInput's and children's onChange props aren't the same
function InvalidInput(props) {
return (
<MaskInput mask="99/99/9999" value={props.value}>
<TextField type="tel" disableUnderline onChange={props.onChange} />
</MaskInput>
);
}
maskedString
You can use function maskedString
to apply your mask on a string.
maskedString(value, mask, type)
value
- stringmask
- mask to apply on your valuetype
- type of your value:"text"
or"tel"
. Default:"tel"
import { maskedString } from "@gruzf/mask-input";
maskedString("1234567890", "+7 (999) 999-99-99"); // +7 (123) 456-78-90
Known Issues
Autofill
Browser's autofill requires either empty value in input or value which exactly matches beginning of the autofilled value. I.e. autofilled value "+1 (555) 123-4567" will work with "+1" or "+1 (5", but won't work with "+1 (___) ___-____" or "1 (555)". There are several possible solutions:
- Set
maskChar
to null and trim space after "+1" withbeforeMaskedStateChange
if no more digits are entered. - Apply mask only if value is not empty. In general, this is the most reliable solution because we can't be sure about formatting in autofilled value.
- Use less formatting in the mask.
Please note that it might lead to worse user experience (should I enter +1 if input is empty?). You should choose what's more important to your users — smooth typing experience or autofill. Phone and ZIP code inputs are very likely to be autofilled and it's a good idea to care about it, while security confirmation code in two-factor authorization shouldn't care about autofill at all.