react-native-mask-input/lib/module/useMaskedInputProps.js

TextInput with mask for ReactNative on both iOS and Android. Includes obfuscation characters feature.

import * as React from 'react';
import formatWithMask from './formatWithMask';
export default (props => {
  const {
    value,
    mask,
    onChangeText,
    placeholderFillCharacter = '_',
    obfuscationCharacter,
    showObfuscatedValue,
    maskAutoComplete
  } = props;
  const maskArray = React.useMemo(() => typeof mask === 'function' ? mask(value) : mask, [mask, value]);
  const formattedValueResult = React.useMemo(() => {
    return formatWithMask({
      text: value || '',
      mask,
      obfuscationCharacter
    });
  }, [mask, obfuscationCharacter, value]);
  const maskHasObfuscation = React.useMemo(() => maskArray && !!maskArray.find(maskItem => Array.isArray(maskItem)), [maskArray]);
  const isValueObfuscated = React.useMemo(() => !!maskHasObfuscation && !!showObfuscatedValue, [maskHasObfuscation, showObfuscatedValue]);
  const handleChangeText = React.useCallback(text => {
    let textToFormat = text;

    if (isValueObfuscated) {
      textToFormat = formattedValueResult.masked || '';

      if (textToFormat.length > text.length) {
        textToFormat = textToFormat.slice(0, -1);
      } else if (textToFormat.length < text.length) {
        textToFormat = textToFormat + text[text.length - 1];
      }
    }

    const result = formatWithMask({
      text: textToFormat,
      mask,
      obfuscationCharacter,
      maskAutoComplete: maskAutoComplete && textToFormat.length > formattedValueResult.masked.length
    });
    onChangeText && onChangeText(result.masked, result.unmasked, result.obfuscated);
  }, [isValueObfuscated, mask, obfuscationCharacter, onChangeText, formattedValueResult.masked, maskAutoComplete]);
  const defaultPlaceholder = React.useMemo(() => {
    if (maskArray) {
      return maskArray.map(maskChar => {
        if (typeof maskChar === 'string') {
          return maskChar;
        } else {
          return placeholderFillCharacter;
        }
      }).join('');
    } else {
      return undefined;
    }
  }, [maskArray, placeholderFillCharacter]);
  const inputValue = isValueObfuscated ? formattedValueResult.obfuscated : formattedValueResult.masked;
  return {
    onChangeText: handleChangeText,
    value: inputValue,
    selection: isValueObfuscated ? {
      start: inputValue.length,
      end: inputValue.length
    } : undefined,
    placeholder: defaultPlaceholder
  };
});
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