FormMaskField Component

A flexible, Material-UI integrated form field component with advanced text masking capabilities and Formik integration.

it is part of https://www.npmjs.com/package/form-input-fields

Features

• Material-UI Integration: Consistent styling with other form components
• Formik Integration: Seamless form state management
• Flexible Masking: Pattern-based input masking with multiple character types
• Uppercase Conversion: Automatic text transformation
• TypeScript Support: Full type safety and IntelliSense
• Clean Value Option: Return masked or unmasked values to form state

Usage

Basic Usage with Formik

import { Formik, Field } from "formik";
import { FormMaskField } from "form-input-mask-field";

<Formik
  initialValues={{ phoneNumber: "", gameCode: "" }}
  onSubmit={(values) => console.log(values)}
>
  <Field
    component={FormMaskField}
    name="phoneNumber"
    label="Phone Number"
    mask="(999) 999-9999"
    placeholder="Enter phone number"
  />

  <Field
    component={FormMaskField}
    name="gameCode"
    label="Game Code"
    mask="AAAAA"
    toUpperCase={true}
    returnCleanValue={true}
  />
</Formik>;

Mask Pattern Characters

| Character | Description | Example | | --------- | ---------------------------- | ------------------------ | | 9 | Digit (0-9) | 999-99-9999 for SSN | | A | Letter (a-z, A-Z) | AAA for country code | | * | Alphanumeric (a-z, A-Z, 0-9) | ***-*** for mixed code | | a | Lowercase letter (a-z) | aaa for lowercase only | | Z | Uppercase letter (A-Z) | ZZZ for uppercase only | | # | Hexadecimal (0-9, A-F, a-f) | ###### for hex color | | Any other | Literal character | -, (, ), /, etc. |

Props

| Prop | Type | Default | Description | | ------------------ | ---------- | ------- | -------------------------------------------------------------- | | mask | string | - | Mask pattern using the characters above | | placeholderChar | string | '_' | Character shown in placeholder for mask positions | | toUpperCase | boolean | false | Convert input to uppercase automatically | | returnCleanValue | boolean | false | Return unmasked value to Formik (true) or masked value (false) | | showMaskPattern | boolean | false | Show the mask pattern as helper text below the input field | | showPlaceholder | boolean | false | Show placeholder text with mask pattern in the input field | | onChange | function | - | Custom change handler with masked, clean, and raw values |

Plus all standard Material-UI TextField props and Formik FieldProps.

Examples

Phone Number

<Field
  component={FormMaskField}
  name="phone"
  label="Phone Number"
  mask="(999) 999-9999"
  placeholder="(555) 123-4567"
/>

Date Input

<Field
  component={FormMaskField}
  name="date"
  label="Date"
  mask="99/99/9999"
  placeholder="MM/DD/YYYY"
/>

Product Code (Uppercase)

<Field
  component={FormMaskField}
  name="productCode"
  label="Product Code"
  mask="AAA-999-AAA"
  toUpperCase={true}
  returnCleanValue={true}
/>

Credit Card

<Field
  component={FormMaskField}
  name="creditCard"
  label="Credit Card"
  mask="9999 9999 9999 9999"
  placeholder="1234 5678 9012 3456"
/>

Custom Change Handler

<Field
  component={FormMaskField}
  name="customField"
  label="Custom Field"
  mask="999-AAA"
  onChange={(event) => {
    console.log("Masked value:", event.target.value);
    console.log("Clean value:", event.target.cleanValue);
    console.log("Raw input:", event.target.rawValue);
  }}
/>

Show Mask Pattern

<Field
  component={FormMaskField}
  name="gameCode"
  label="Game Code"
  mask="AAA-999"
  showMaskPattern={true}
  toUpperCase={true}
/>
// This will show "Pattern: AAA-999" as helper text below the input

Show Placeholder

<Field
  component={FormMaskField}
  name="phoneNumber"
  label="Phone Number"
  mask="(999) 999-9999"
  showPlaceholder={true}
/>
// This will show "(___) ___-____" as placeholder text in the input field

Complete Example Application

Here's a comprehensive example showing how to build a complete form application using FormMaskField with Material-UI and Formik:

App.tsx

import React from "react";
import { Formik, Form, Field, FormikHelpers, FormikErrors } from "formik";
import Container from "@mui/material/Container";
import Typography from "@mui/material/Typography";
import Box from "@mui/material/Box";
import Button from "@mui/material/Button";
import { Grid } from "@mui/material";
import Paper from "@mui/material/Paper";
import Alert from "@mui/material/Alert";
import { ThemeProvider, createTheme } from "@mui/material/styles";
import CssBaseline from "@mui/material/CssBaseline";
import { FormMaskField } from "form-input-mask-field";
import "./App.css";

interface FormValues {
  phone: string;
  date: string;
  creditCard: string;
  licensePlate: string;
  hexColor: string;
  customCode: string;
  socialSecurity: string;
  postalCode: string;
}

interface FormFieldEvent
  extends Omit<React.ChangeEvent<HTMLInputElement>, "target"> {
  target: HTMLInputElement & {
    value: string;
    cleanValue: string;
    rawValue: string;
    name: string;
  };
}

// Create a Material-UI theme
const theme = createTheme({
  palette: {
    primary: {
      main: "#1976d2",
    },
    secondary: {
      main: "#dc004e",
    },
  },
});

// Validation schema
const validateForm = (values: FormValues): FormikErrors<FormValues> => {
  const errors: Partial<FormValues> = {};

  if (!values.phone) {
    errors.phone = "Phone number is required";
  } else if (values.phone.replace(/\D/g, "").length < 10) {
    errors.phone = "Phone number must be 10 digits";
  }

  if (!values.date) {
    errors.date = "Date is required";
  }

  if (!values.creditCard) {
    errors.creditCard = "Credit card is required";
  } else if (values.creditCard.replace(/\D/g, "").length < 16) {
    errors.creditCard = "Credit card must be 16 digits";
  }

  if (!values.licensePlate) {
    errors.licensePlate = "License plate is required";
  }

  return errors;
};

function App() {
  const initialValues: FormValues = {
    phone: "",
    date: "",
    creditCard: "",
    licensePlate: "",
    hexColor: "",
    customCode: "",
    socialSecurity: "",
    postalCode: "",
  };

  const handleSubmit = (
    values: FormValues,
    { setSubmitting }: FormikHelpers<FormValues>
  ) => {
    console.log("Form Values:", values);
    setTimeout(() => {
      alert("Form submitted! Check console for values.");
      setSubmitting(false);
    }, 400);
  };

  const handleCustomChange =
    (fieldName: keyof FormValues) => (event: FormFieldEvent) => {
      console.log(`${fieldName} changed:`, {
        masked: event.target.value,
        clean: event.target.cleanValue,
        raw: event.target.rawValue,
      });
      return event;
    };

  return (
    <ThemeProvider theme={theme}>
      <CssBaseline />
      <Container maxWidth="lg" sx={{ py: 4 }}>
        <Typography variant="h3" component="h1" gutterBottom align="center">
          FormMaskField Demo
        </Typography>

        <Typography
          variant="subtitle1"
          align="center"
          color="text.secondary"
          paragraph
        >
          A comprehensive example showcasing the FormMaskField component with
          various mask patterns and configurations
        </Typography>

        <Formik
          initialValues={initialValues}
          validate={validateForm}
          onSubmit={handleSubmit}
        >
          {({ values, isSubmitting, errors, touched }) => (
            <Form>
              <Grid container spacing={3}>
                {/* Basic Masks Section */}
                <Grid>
                  <Paper elevation={2} sx={{ p: 3 }}>
                    <Typography variant="h5" gutterBottom>
                      Basic Input Masks
                    </Typography>

                    <Grid container spacing={2}>
                      <Grid>
                        <Field
                          name="phone"
                          component={FormMaskField}
                          label="Phone Number"
                          mask="(999) 999-9999"
                          showMaskPattern={true}
                          showPlaceholder={true}
                          helperText="US phone number format"
                          onChange={handleCustomChange("phone")}
                        />
                      </Grid>

                      <Grid>
                        <Field
                          name="date"
                          component={FormMaskField}
                          label="Date"
                          mask="99/99/9999"
                          showMaskPattern={true}
                          showPlaceholder={true}
                          helperText="MM/DD/YYYY format"
                        />
                      </Grid>

                      <Grid>
                        <Field
                          name="socialSecurity"
                          component={FormMaskField}
                          label="Social Security Number"
                          mask="999-99-9999"
                          showMaskPattern={true}
                          showPlaceholder={true}
                          returnCleanValue={true}
                          helperText="Clean value returned (no dashes)"
                        />
                      </Grid>

                      <Grid>
                        <Field
                          name="postalCode"
                          component={FormMaskField}
                          label="ZIP Code"
                          mask="99999-9999"
                          showMaskPattern={true}
                          showPlaceholder={true}
                          helperText="US ZIP+4 format"
                        />
                      </Grid>
                    </Grid>
                  </Paper>
                </Grid>

                {/* Advanced Masks Section */}
                <Grid>
                  <Paper elevation={2} sx={{ p: 3 }}>
                    <Typography variant="h5" gutterBottom>
                      Advanced Input Masks
                    </Typography>

                    <Grid container spacing={2}>
                      <Grid>
                        <Field
                          name="creditCard"
                          component={FormMaskField}
                          label="Credit Card Number"
                          mask="9999-9999-9999-9999"
                          showMaskPattern={true}
                          showPlaceholder={true}
                          helperText="16-digit credit card number"
                          onChange={handleCustomChange("creditCard")}
                        />
                      </Grid>

                      <Grid>
                        <Field
                          name="licensePlate"
                          component={FormMaskField}
                          label="License Plate"
                          mask="AAA-999"
                          toUpperCase={true}
                          showMaskPattern={true}
                          showPlaceholder={true}
                          helperText="3 letters + 3 numbers (auto uppercase)"
                          onChange={handleCustomChange("licensePlate")}
                        />
                      </Grid>

                      <Grid>
                        <Field
                          name="hexColor"
                          component={FormMaskField}
                          label="Hex Color Code"
                          mask="#######"
                          toUpperCase={true}
                          showMaskPattern={true}
                          showPlaceholder={true}
                          placeholderChar="0"
                          helperText="6-digit hex color code"
                        />
                      </Grid>

                      <Grid>
                        <Field
                          name="customCode"
                          component={FormMaskField}
                          label="Custom Code"
                          mask="**-999-AA"
                          toUpperCase={true}
                          returnCleanValue={true}
                          showMaskPattern={true}
                          showPlaceholder={true}
                          helperText="Alphanumeric + digits + letters"
                          onChange={handleCustomChange("customCode")}
                        />
                      </Grid>
                    </Grid>
                  </Paper>
                </Grid>

                {/* Current Values Display */}
                <Grid>
                  <Paper elevation={2} sx={{ p: 3 }}>
                    <Typography variant="h5" gutterBottom>
                      Current Form Values
                    </Typography>

                    <Box sx={{ mt: 2 }}>
                      <Typography
                        variant="body2"
                        component="pre"
                        sx={{
                          backgroundColor: "#f5f5f5",
                          p: 2,
                          borderRadius: 1,
                          overflow: "auto",
                          fontSize: "0.875rem",
                        }}
                      >
                        {JSON.stringify(values, null, 2)}
                      </Typography>
                    </Box>
                  </Paper>
                </Grid>

                {/* Form Errors Display */}
                {Object.keys(errors).length > 0 &&
                  Object.keys(touched).length > 0 && (
                    <Grid>
                      <Alert severity="error">
                        <Typography variant="h6" gutterBottom>
                          Form Validation Errors:
                        </Typography>
                        <ul>
                          {Object.entries(errors).map(
                            ([field, error]) =>
                              touched[field] && (
                                <li key={field}>
                                  <strong>{field}:</strong> {error}
                                </li>
                              )
                          )}
                        </ul>
                      </Alert>
                    </Grid>
                  )}

                {/* Submit Button */}
                <Grid>
                  <Box
                    sx={{ display: "flex", justifyContent: "center", mt: 2 }}
                  >
                    <Button
                      type="submit"
                      variant="contained"
                      size="large"
                      disabled={isSubmitting}
                      sx={{ minWidth: 200 }}
                    >
                      {isSubmitting ? "Submitting..." : "Submit Form"}
                    </Button>
                  </Box>
                </Grid>
              </Grid>
            </Form>
          )}
        </Formik>
      </Container>
    </ThemeProvider>
  );
}

export default App;

App.css

#root {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem;
  text-align: center;
}

.logo {
  height: 6em;
  padding: 1.5em;
  will-change: filter;
  transition: filter 300ms;
}

.logo:hover {
  filter: drop-shadow(0 0 2em #646cffaa);
}

.logo.react:hover {
  filter: drop-shadow(0 0 2em #61dafbaa);
}

@keyframes logo-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: no-preference) {
  a:nth-of-type(2) .logo {
    animation: logo-spin infinite 20s linear;
  }
}

.card {
  padding: 2em;
}

.read-the-docs {
  color: #888;
}

Key Features Demonstrated

This example application showcases:

1. Complete Form Integration: Full Formik integration with validation and error handling
2. Multiple Mask Types: Phone numbers, dates, credit cards, license plates, hex colors, and custom codes
3. Advanced Features:
   • Uppercase conversion (toUpperCase)
   • Clean value return (returnCleanValue)
   • Custom placeholder characters (placeholderChar)
   • Pattern display (showMaskPattern)
   • Placeholder display (showPlaceholder)
4. Custom Event Handling: onChange handlers that provide masked, clean, and raw values
5. Material-UI Integration: Consistent styling with Material-UI theme and components
6. Real-time Validation: Form validation with error display
7. Live Value Display: Real-time display of current form values
8. Responsive Layout: Grid-based responsive layout

Running the Example

To run this example:

1. Install dependencies: npm install
2. Start the development server: npm run dev
3. Open your browser and navigate to the local development URL
4. Interact with the form fields to see the masking in action
5. Open browser console to see custom onChange event data

The example demonstrates how FormMaskField seamlessly integrates with existing Material-UI and Formik workflows while providing powerful input masking capabilities.

Support

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