This jQuery plugin filters keyboard input by specified regular expression.

Source code inspired by Ext.JS (Ext.form.TextField, Ext.EventManager), but was modified to provide more accurate logic.

$("#ggg").keyfilter(/[\dA-F]/);

Also you can pass test function instead of regexp. Its arguments:

• this - HTML DOM Element (event target).
• c - String that contains incoming character.

$("#ggg").keyfilter(function(c) { return c != 'a'; });

<input type="text" class="mask-num" />

Inputs with CSS classes like this will automatically have the corresponding regexp below applied.

• mask-pint: /[\d]/
• mask-int: /[\d\-]/
• mask-pnum: /[\d\.]/
• mask-num: /[\d\-\.]/
• mask-hex: /[0-9a-f]/i
• mask-email: /[a-z0-9_\.\-@]/i
• mask-alpha: /[a-z_]/i
• mask-alphanum: /[a-z0-9_]/i

You can apply these standard regexps to different classes if you wish.

$("input.integer").keyfilter($.fn.keyfilter.defaults.masks.int)

Keyfilter supports extending and changing of list of provided masks.

/*
 * Key filter masks for hosting.
 */

(function($)
{
  var hostingMasks = {
    dir: /[a-z0-9_\/\-\.]/i,
    ftpuser: /[a-z0-9_]/
  };

  $.extend($.fn.keyfilter.defaults.masks, hostingMasks);

})(jQuery);

/*
 * Key filter masks supporting french accents.
 */

(function($)
{
  $.extend($.fn.keyfilter.defaults.masks, {
    alpha:    /[a-zéèçàêoe_]/i,
    alphanum: /[a-zéèçàêoe0-9_]/i
  });
})(jQuery);

You can fully override masks by simple assignment after the plugin loads but before the document.ready event fires.

$.fn.keyfilter.defaults.masks = { ... };