/// <reference path="../../../lib/jquery-1.2.6.js" />
/*
	Masked Input plugin for jQuery
	Copyright (c) 2007-2009 Josh Bush (digitalbush.com)
	Licensed under the MIT license (http://digitalbush.com/projects/masked-input-plugin/#license) 
	Version: 1.2.2 (03/09/2009 22:39:06)
*/

/*
http://webdeveloperplus.com/jquery/how-to-mask-input-with-jquery/

let us say you want to mask an input textbox so that it accepts only Tax ID numbers in the format 99-9999999. Firstly add a text input box to your page with say id as ‘taxid’. Now to mask the input for taxid, add this line to your jquery document ready function.
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   $('#date').mask("99-9999999");  

In the above code, we passed a parameter to mask function to mask the input. Here 9 stands for an integer between 0-9. You can use a to denote alphabet(A-Z, a-z) and * to denote alphabets and numerals(A-Z, a-z, 0-9).

And if you need to define your own set of input symbols, you can define that too. Let us say you want to define a mask with character # that will let user input any number from 1-4. Add the following definition in the jquery ready function before you use this mask.
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   $.mask.definitions['#']='[1234]';  

By default the mask function uses underscore to denote input points in text box. If you want to customize it to say dash ‘-‘ for a particular text box, you can pass an optional parameter to mask function.
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   $('#date').mask("99/99/9999",{placeholder:"-"});  

With this masked input plugin, you can make your form inputs more user friendly and less error prone as it won’t allow any other input except those defined by the mask.
*/
(function($) {
	var pasteEventName = ($.browser.msie ? 'paste' : 'input') + ".mask";
	var iPhone = (window.orientation != undefined);

	$.mask = {
		//Predefined character definitions
		definitions: {
			'9': "[0-9]",
			'a': "[A-Za-z]",
			'*': "[A-Za-z0-9]"
		}
	};

	$.fn.extend({
		//Helper Function for Caret positioning
		caret: function(begin, end) {
			if (this.length == 0) return;
			if (typeof begin == 'number') {
				end = (typeof end == 'number') ? end : begin;
				return this.each(function() {
					if (this.setSelectionRange) {
						this.focus();
						this.setSelectionRange(begin, end);
					} else if (this.createTextRange) {
						var range = this.createTextRange();
						range.collapse(true);
						range.moveEnd('character', end);
						range.moveStart('character', begin);
						range.select();
					}
				});
			} else {
				if (this[0].setSelectionRange) {
					begin = this[0].selectionStart;
					end = this[0].selectionEnd;
				} else if (document.selection && document.selection.createRange) {
					var range = document.selection.createRange();
					begin = 0 - range.duplicate().moveStart('character', -100000);
					end = begin + range.text.length;
				}
				return { begin: begin, end: end };
			}
		},
		unmask: function() { return this.trigger("unmask"); },
		mask: function(mask, settings) {
			if (!mask && this.length > 0) {
				var input = $(this[0]);
				var tests = input.data("tests");
				return $.map(input.data("buffer"), function(c, i) {
					return tests[i] ? c : null;
				}).join('');
			}
			settings = $.extend({
				placeholder: "_",
				completed: null
			}, settings);

			var defs = $.mask.definitions;
			var tests = [];
			var partialPosition = mask.length;
			var firstNonMaskPos = null;
			var len = mask.length;

			$.each(mask.split(""), function(i, c) {
				if (c == '?') {
					len--;
					partialPosition = i;
				} else if (defs[c]) {
					tests.push(new RegExp(defs[c]));
					if(firstNonMaskPos==null)
						firstNonMaskPos =  tests.length - 1;
				} else {
					tests.push(null);
				}
			});

			return this.each(function() {
				var input = $(this);
				var buffer = $.map(mask.split(""), function(c, i) { if (c != '?') return defs[c] ? settings.placeholder : c });
				var ignore = false;  			//Variable for ignoring control keys
				var focusText = input.val();

				input.data("buffer", buffer).data("tests", tests);

				function seekNext(pos) {
					while (++pos <= len && !tests[pos]);
					return pos;
				};

				function shiftL(pos) {
					while (!tests[pos] && --pos >= 0);
					for (var i = pos; i < len; i++) {
						if (tests[i]) {
							buffer[i] = settings.placeholder;
							var j = seekNext(i);
							if (j < len && tests[i].test(buffer[j])) {
								buffer[i] = buffer[j];
							} else
								break;
						}
					}
					writeBuffer();
					input.caret(Math.max(firstNonMaskPos, pos));
				};

				function shiftR(pos) {
					for (var i = pos, c = settings.placeholder; i < len; i++) {
						if (tests[i]) {
							var j = seekNext(i);
							var t = buffer[i];
							buffer[i] = c;
							if (j < len && tests[j].test(t))
								c = t;
							else
								break;
						}
					}
				};

				function keydownEvent(e) {
					var pos = $(this).caret();
					var k = e.keyCode;
					ignore = (k < 16 || (k > 16 && k < 32) || (k > 32 && k < 41));

					//delete selection before proceeding
					if ((pos.begin - pos.end) != 0 && (!ignore || k == 8 || k == 46))
						clearBuffer(pos.begin, pos.end);

					//backspace, delete, and escape get special treatment
					if (k == 8 || k == 46 || (iPhone && k == 127)) {//backspace/delete
						shiftL(pos.begin + (k == 46 ? 0 : -1));
						return false;
					} else if (k == 27) {//escape
						input.val(focusText);
						input.caret(0, checkVal());
						return false;
					}
				};

				function keypressEvent(e) {
					if (ignore) {
						ignore = false;
						//Fixes Mac FF bug on backspace
						return (e.keyCode == 8) ? false : null;
					}
					e = e || window.event;
					var k = e.charCode || e.keyCode || e.which;
					var pos = $(this).caret();

					if (e.ctrlKey || e.altKey || e.metaKey) {//Ignore
						return true;
					} else if ((k >= 32 && k <= 125) || k > 186) {//typeable characters
						var p = seekNext(pos.begin - 1);
						if (p < len) {
							var c = String.fromCharCode(k);
							if (tests[p].test(c)) {
								shiftR(p);
								buffer[p] = c;
								writeBuffer();
								var next = seekNext(p);
								$(this).caret(next);
								if (settings.completed && next == len)
									settings.completed.call(input);
							}
						}
					}
					return false;
				};

				function clearBuffer(start, end) {
					for (var i = start; i < end && i < len; i++) {
						if (tests[i])
							buffer[i] = settings.placeholder;
					}
				};

				function writeBuffer() { return input.val(buffer.join('')).val(); };

				function checkVal(allow) {
					//try to place characters where they belong
					var test = input.val();
					var lastMatch = -1;
					for (var i = 0, pos = 0; i < len; i++) {
						if (tests[i]) {
							buffer[i] = settings.placeholder;
							while (pos++ < test.length) {
								var c = test.charAt(pos - 1);
								if (tests[i].test(c)) {
									buffer[i] = c;
									lastMatch = i;
									break;
								}
							}
							if (pos > test.length)
								break;
						} else if (buffer[i] == test[pos] && i!=partialPosition) {
							pos++;
							lastMatch = i;
						} 
					}
					if (!allow && lastMatch + 1 < partialPosition) {
						input.val("");
						clearBuffer(0, len);
					} else if (allow || lastMatch + 1 >= partialPosition) {
						writeBuffer();
						if (!allow) input.val(input.val().substring(0, lastMatch + 1));
					}
					return (partialPosition ? i : firstNonMaskPos);
				};

				if (!input.attr("readonly"))
					input
					.one("unmask", function() {
						input
							.unbind(".mask")
							.removeData("buffer")
							.removeData("tests");
					})
					.bind("focus.mask", function() {
						focusText = input.val();
						var pos = checkVal();
						writeBuffer();
						setTimeout(function() {
							if (pos == mask.length)
								input.caret(0, pos);
							else
								input.caret(pos);
						}, 0);
					})
					.bind("blur.mask", function() {
						checkVal();
						if (input.val() != focusText)
							input.change();
					})
					.bind("keydown.mask", keydownEvent)
					.bind("keypress.mask", keypressEvent)
					.bind(pasteEventName, function() {
						setTimeout(function() { input.caret(checkVal(true)); }, 0);
					});

				checkVal(); //Perform initial check for existing values
			});
		}
	});
})(jQuery);