Real-time Form Validation & Auto Formatting Plugin - field-validator.js

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License: MIT
Real-time Form Validation & Auto Formatting Plugin - field-validator.js

field-validator.js is a simple, powerful jQuery form validation plugin which enables you to validate and auto-format form fields on the client side.

More features:

  • A set of pre-defined validators.
  • Auto formats input values as typing.
  • Auto validates & formats input fields when you jump to the next one.
  • Custom background & styles for valid and invalid form fields.

Validators included:

  • Email.
  • Required.
  • Credit card.
  • Date and time.
  • Custom validators using REGEX.

Basic usage:

1. Include the latest version of jQuery library and the jQuery field-validator.js script on the web page.

<script src="//"></script>
<script src="field-validator.js"></script>

2. Add validations and custom validation rules to your form fields as follows:

  <div><label>This Field is Required:</label> <input type="text" id="req" class="form-control" required /></div>
  <div><label>A Person's Full Name:</label> <input type="text" class="form-control" pattern="^[a-zA-Z ,.'-]+$" /></div>
  <div><label>Three Four-Letter Words:</label> <input type="text" class="form-control" pattern="^[a-zA-Z]{4} [a-zA-Z]{4} [a-zA-Z]{4}$" /></div>
  <div><label>An Email Address:</label> <input type="text" class="form-control" data-type="email" /></div>

  <div><label>A Number:</label> <input type="text" class="form-control" pattern="^[0-9]*$" /></div>
  <div><label>A Single Digit:</label> <input type="text" class="form-control" pattern="^[0-9]$" /></div>
  <div><label>An Amount of Money:</label> <input type="text" class="form-control" data-type="money" /></div>
  <div><label>A Credit Card Number:</label> <input type="text" class="form-control" data-type="creditcard" data-cardicons="on" data-discover="on" data-amex="on" /></div>

  <div><label>This Field Will Become Title Case:</label> <input type="text" class="form-control" data-format="titlecase" /></div>
  <div><label>This Number Will Be Padded:</label> <input type="text" class="form-control" pattern="^[0-9]{1,10}$" data-pad="10" /></div>
  <div><label>Type a Date, Nearly Any Format Will Work:</label> <input type="text" class="form-control" data-type="date" /></div>

3. Customize the background color of invalid form fields.

fieldValidator.backgroundInvalid = "rgb(255, 240, 240)";

4. Customize the CSS styles of invalid form fields.

.form-error { ... }

5. All customization options.

  fieldSelector: ".form-control",
  errorSelector: ".form-error",

  inputDelay: 2000,
  animDelay: 500,

  colorValid: "blue",
  colorInvalid: "red",

  borderValid: undefined,
  borderInvalid: "red",

  backgroundValid: undefined,
  backgroundInvalid: undefined,

  describe: function (element, value) {
      function ident() {
          if ($(element).attr("id")) {
              return "#" + $(element).attr("id");
          } else if ($(element).attr("name")) {
              return "[name=" + $(element).attr("name") + "]";
          } else {
              return "." + $(element).attr("class").replace(/ /g, '.');
      return "<" + $(element)[0].tagName + "/> " + ident() + (!value ? "" : ": " + $(element).val());

  onvalid: function (callback) {
      if (callback) {
          handler = callback;
      } else {
          return handler;

This awesome jQuery plugin is developed by paulwardrip. For more Advanced Usages, please check the demo page or visit the official website.