jQuery Mask Plugin

http://plugins.jquery.com/mask/

Documentation

Basic Usage Examples

$(document).ready(function(){
  $('.date').mask('00/00/0000');
  $('.time').mask('00:00:00');
  $('.date_time').mask('00/00/0000 00:00:00');
  $('.cep').mask('00000-000');
  $('.phone').mask('0000-0000');
  $('.phone_with_ddd').mask('(00) 0000-0000');
  $('.phone_us').mask('(000) 000-0000');
  $('.mixed').mask('AAA 000-S0S');
  $('.cpf').mask('000.000.000-00', {reverse: true});
  $('.money').mask('000.000.000.000.000,00', {reverse: true});
  $('.money2').mask("#.##0,00", {reverse: true});
  $('.ip_address').mask('0ZZ.0ZZ.0ZZ.0ZZ', {
    translation: {
      'Z': {
        pattern: /[0-9]/, optional: true
      }
    }
  });
  $('.ip_address').mask('099.099.099.099');
  $('.percent').mask('##0,00%', {reverse: true});
  $('.clear-if-not-match').mask("00/00/0000", {clearIfNotMatch: true});
  $('.placeholder').mask("00/00/0000", {placeholder: "__/__/____"});
  $('.fallback').mask("00r00r0000", {
      translation: {
        'r': {
          pattern: /[\/]/, 
          fallback: '/'
        }, 
        placeholder: "__/__/____"
      }
    });
);

Callback Examples

var options =  { 
  onComplete: function(cep) {
    alert('CEP Completed!:' + cep);
  },
  onKeyPress: function(cep, event, currentField, options){
    console.log('An key was pressed!:', cep, ' event: ', event, 
                'currentField: ', currentField, ' options: ', options);
  },
  onChange: function(cep){
    console.log('cep changed! ', cep);
  },
  onInvalid: function(val, e, f, invalid, options){
    var error = invalid[0];
    console.log ("Digit: ", error.v, " is invalid for the position: ", error.p, ". We expect something like: ", error.e);
  }
};

$('.cep_with_callback').mask('00000-000', options);

On-the-fly mask change

var options =  {onKeyPress: function(cep, e, field, options){
  var masks = ['00000-000', '0-00-00-00'];
    mask = (cep.length>7) ? masks[1] : masks[0];
  $('.crazy_cep').mask(mask, options);
}};

$('.crazy_cep').mask('00000-000', options);

Mask as a function

var SPMaskBehavior = function (val) {
  return val.replace(/\D/g, '').length === 11 ? '(00) 00000-0000' : '(00) 0000-00009';
},
spOptions = {
  onKeyPress: function(val, e, field, options) {
      field.mask(SPMaskBehavior.apply({}, arguments), options);
    }
};

$('.sp_celphones').mask(SPMaskBehavior, spOptions);

Using HTML Notation Exemples

To get your mask applied with the data-mask attribute just use it as the same way you use with the $.mask function. 

<input type="text" name="field-name" data-mask="00/00/0000" />

Activating a reversible mask 

<input type="text" name="field-name" data-mask="00/00/0000" data-mask-reverse="true" />

Using clearIfNotMatch option 

<input type="text" name="field-name" data-mask="00/00/0000" data-mask-clearifnotmatch="true" />

Translation

Teach to jQuery Mask Plugin how to apply your mask: 

// now the digit 0 on your mask pattern will be interpreted 
// as valid characters like 0,1,2,3,4,5,6,7,8,9 and *
$('.your-field').mask('00/00/0000', {'translation': {0: {pattern: /[0-9*]/}}});

By default, jQuery Mask Plugin only reconizes the logical digit A (Numbers and Letters) and S (A-Za-z) but you can extend or modify this behaviour by telling to jQuery Mask Plugin how to interpret those logical digits. 

$('.your-field').mask('AA/SS/YYYY', {'translation': {
                                        A: {pattern: /[A-Za-z0-9]/}, 
                                        S: {pattern: /[A-Za-z]/},  
                                        Y: {pattern: /[0-9]/}
                                      }
                                });

Now jQuery Mask Plugin knows the logic digit Y and you can create your own pattern. 

Optional digits

You can also tell to jQuery Mask which digit is optional, to create a IP mask for example: 

// way 1
$('.ip_address').mask('099.099.099.099');
// way 2
$('.ip_address').mask('0ZZ.0ZZ.0ZZ.0ZZ', {translation:  {'Z': {pattern: /[0-9]/, optional: true}}});

Now, all Z digits in your masks is optional. 

Recursive digits

With jQuery Mask Plugin you can also define recursive patterns inside your mask: 

$('.money_example').mask('#.##0,00', {reverse: true});

With example above the mask will be placed from the right to the left (that's why reverse:true is defined). As soon as you start typing, a "0,00" will be applied followed by repeating recursively the following pattern "#.##". The result could be something like: 1.234.567,890. 

You can also use that kind of feature to define what kind of data could be typed inside of a field:

$('.example').mask('0#');

Now only numbers will be allowed inside your form field. 

Fallback digits

When a user types a invalid char for the current position the plugin will replace it by its fallback instead of erasing them.

$('.field_with_fallback').mask("00r00r0000", {
  translation: {
    'r': {
      pattern: /[\/]/, 
      fallback: '/'
    }, 
    placeholder: "__/__/____"
  }
});

Removing the mask

$('.date').unmask();

Getting the unmasked typed value

$('.date').cleanVal();

Customization

jQuery Mask Plugin has a few default options that you can overwrite as you like:

Field Options

var custom_options = {
  byPassKeys: [8, 9, 37, 38, 39, 40],
  translation: {
                '0': {pattern: /\d/}, 
                '9': {pattern: /\d/, optional: true}, 
                '#': {pattern: /\d/, recursive: true}, 
                'A': {pattern: /[a-zA-Z0-9]/}, 
                'S': {pattern: /[a-zA-Z]/}
            };
};

byPassKeys list of keyboard's keyCode that you want to be ignored when it was pressed. 
translation object with all digits that should be interpreted as a special chars and its regex representation. 

Global Options

// nonInput: elements we consider nonInput
// dataMask: we mask data-mask elements by default
// watchInputs: watch for dynamically added inputs by default
// watchDataMask: by default we disabled the watcher for dynamically added data-mask elements by default (performance reasons)
 $.jMaskGlobals = {
    nonInput: 'td,span,div', 
    dataMask: true, 
    watchInterval: 300,
    watchInputs: true, 
    watchDataMask: false,
    byPassKeys: [9, 16, 17, 18, 36, 37, 38, 39, 40, 91],
    translation: {
      '0': {pattern: /\d/},
      '9': {pattern: /\d/, optional: true},
      '#': {pattern: /\d/, recursive: true},
      'A': {pattern: /[a-zA-Z0-9]/},
      'S': {pattern: /[a-zA-Z]/}
    }
  };