https://www.sidel.com/Scripts/libs/jquery/jquery.placeholder-enhanced.min.js

1/*!
2* jQuery Placeholder Enhanced 1.5
3* Copyright (c) 2013 Denis Ciccale (@tdecs)
4* Released under MIT license (https://raw.github.com/dciccale/placeholder-enhanced/master/LICENSE.txt)
5*/
6(function ($) {
7
8    var pluginName = 'placeholderEnhanced',
9	// if browser supports placeholder attribute, use native events to show/hide placeholder
10    hasNativeSupport = 'placeholder' in document.createElement('input') && 'placeholder' in document.createElement('textarea'),
11	// events namespaces
12    event = {
13        focus: 'focus.placeholder',
14        blur: 'blur.placeholder',
15        submit: 'submit.placeholder'
16    },
17	// placeholder css class
18    placeholderCssClass = 'placeholder',
19    $val;
20
21    // if placeholder is not supported, the jQuery val function returns the placeholder
22    // wrap the val function to fix this
23    if (!hasNativeSupport) {
24        $val = $.fn.val;
25        $.fn.val = function () {
26            var el = this[0];
27            if (!this.length) {
28                return;
29            }
30            if (!arguments.length && (el.nodeName === 'INPUT' || el.nodeName === 'TEXTAREA')) {
31                return el.value === this.attr('placeholder') ? '' : el.value;
32
33            } else {
34                if (this.hasClass(placeholderCssClass)) {
35                    this.removeClass(placeholderCssClass);
36                }
37                return $val.apply(this, arguments);
38            }
39        };
40    }
41
42    $.fn[pluginName] = function () {
43
44        // don't do anything with an empty collection
45        if (!this.length) {
46            return;
47        }
48
49        // ensure not sending placeholder value when placeholder is not supported
50        if (!hasNativeSupport) {
51            // filter forms to leave only the ones that submit event was not added yet
52            $('form')
53			// only grab forms that are not prepared
54        .filter(function () {
55            return !$.data(this, pluginName);
56        })
57        .each(function () {
58            // bind submit event
59            $(this).bind(event.submit, function () {
60                // empty input value if it's the same as the placeholder attribute
61                $(this).find('input[placeholder], textarea[placeholder]').each(function () {
62                    if (!$(this).val() && !this.disabled) {
63                        this.value = '';
64                    }
65                });
66            });
67            // mark as prepared
68            $.data(this, pluginName, true);
69        });
70        }
71
72        // copy attributes from a DOM node to a plain object to use later
73        function copyAttrs(element) {
74            var attrs = {}, exclude = ['placeholder', 'name', 'id'];
75            $.each(element.attributes, function (i, attr) {
76                if (attr.specified && $.inArray(attr.name, exclude) < 0) {
77                    attrs[attr.name] = attr.value;
78                }
79            });
80            return attrs;
81        }
82
83        // hides specified input
84        function hideInput($input) {
85            $input.css({ position: 'absolute', left: '-9999em' });
86        }
87
88        // shows specified input
89        function showInput($input) {
90            $input.css({ position: '', left: '' });
91        }
92
93
94        return this.each(function () {
95
96            // check if plugin already initialized
97            if ($.data(this, pluginName)) {
98                return;
99            }
100
101            var el = this,
102        $el = $(el),
103        placeholderTxt = $el.attr('placeholder'),
104        isPassword = (el.type === 'password'),
105        fakePassw,
106        setPlaceholder,
107        removePlaceholder;
108
109            // on blur set placeholder
110            setPlaceholder = function () {
111                // if there is no initial value
112                // or initial value is equal to placeholder (done in the fn.val wrapper)
113                // init the placeholder
114                if (!$el.val()) {
115                    if (!hasNativeSupport) {
116                        if (!isPassword) {
117                            $el.val(placeholderTxt).addClass(placeholderCssClass);
118                        } else {
119                            showInput(fakePassw);
120                            hideInput($el);
121                        }
122                    } else {
123                        $el.addClass(placeholderCssClass);
124                    }
125                }
126            };
127
128            // on focus remove placeholder
129            if (!isPassword || hasNativeSupport) {
130                // for non-password inputs and textareas
131                removePlaceholder = function () {
132                    if ($el.hasClass(placeholderCssClass)) {
133                        if (!hasNativeSupport) {
134                            el.value = '';
135                        }
136                        $el.removeClass(placeholderCssClass);
137                    }
138                };
139
140                // for password inputs
141            } else if (!hasNativeSupport) {
142                removePlaceholder = function () {
143                    showInput($el);
144                    hideInput(fakePassw);
145                };
146
147                // create a fake password input
148                fakePassw = $('<input>', $.extend(copyAttrs(el), {
149                    'type': 'text',
150                    value: placeholderTxt,
151                    tabindex: -1 // skip tabbing
152                }))
153				// add placeholder class
154          .addClass(placeholderCssClass)
155				// when fake input has focus, trigger real input focus
156          .bind(event.focus, function () {
157              $el.trigger(event.focus);
158          })
159				// insert fake input
160          .insertBefore($el);
161            }
162
163            // bind events and trigger blur the first time
164            $el
165        .bind(event.blur, setPlaceholder)
166        .bind(event.focus, removePlaceholder)
167        .trigger(event.blur);
168
169            // mark plugin as initialized for current element
170            $.data(el, pluginName, true);
171        });
172    };
173
174    // auto-initialize the plugin
175    $(function () {
176        $('input[placeholder], textarea[placeholder]')[pluginName]();
177    });

178}(jQuery));