https://www.analysisgroup.com/Resources/js/jquery.placeholder.js

1/*! http://mths.be/placeholder v2.0.8 by @mathias */
2;(function(window, document, $) {
3
4	// Opera Mini v7 doesn’t support placeholder although its DOM seems to indicate so
5	var isOperaMini = Object.prototype.toString.call(window.operamini) == '[object OperaMini]';
6	var isInputSupported = 'placeholder' in document.createElement('input') && !isOperaMini;
7	var isTextareaSupported = 'placeholder' in document.createElement('textarea') && !isOperaMini;
8	var prototype = $.fn;
9	var valHooks = $.valHooks;
10	var propHooks = $.propHooks;
11	var hooks;
12	var placeholder;
13
14	if (isInputSupported && isTextareaSupported) {
15
16		placeholder = prototype.placeholder = function() {
17			return this;
18		};
19
20		placeholder.input = placeholder.textarea = true;
21
22	} else {
23
24		placeholder = prototype.placeholder = function() {
25			var $this = this;
26			$this
27				.filter((isInputSupported ? 'textarea' : ':input') + '[placeholder]')
28				.not('.placeholder')
29				.bind({
30					'focus.placeholder': clearPlaceholder,
31					'blur.placeholder': setPlaceholder
32				})
33				.data('placeholder-enabled', true)
34				.trigger('blur.placeholder');
35			return $this;
36		};
37
38		placeholder.input = isInputSupported;
39		placeholder.textarea = isTextareaSupported;
40
41		hooks = {
42			'get': function(element) {
43				var $element = $(element);
44
45				var $passwordInput = $element.data('placeholder-password');
46				if ($passwordInput) {
47					return $passwordInput[0].value;
48				}
49
50				return $element.data('placeholder-enabled') && $element.hasClass('placeholder') ? '' : element.value;
51			},
52			'set': function(element, value) {
53				var $element = $(element);
54
55				var $passwordInput = $element.data('placeholder-password');
56				if ($passwordInput) {
57					return $passwordInput[0].value = value;
58				}
59
60				if (!$element.data('placeholder-enabled')) {
61					return element.value = value;
62				}
63				if (value == '') {
64					element.value = value;
65					// Issue #56: Setting the placeholder causes problems if the element continues to have focus.
66					if (element != safeActiveElement()) {
67						// We can't use `triggerHandler` here because of dummy text/password inputs :(
68						setPlaceholder.call(element);
69					}
70				} else if ($element.hasClass('placeholder')) {
71					clearPlaceholder.call(element, true, value) || (element.value = value);
72				} else {
73					element.value = value;
74				}
75				// `set` can not return `undefined`; see http://jsapi.info/jquery/1.7.1/val#L2363
76				return $element;
77			}
78		};
79
80		if (!isInputSupported) {
81			valHooks.input = hooks;
82			propHooks.value = hooks;
83		}
84		if (!isTextareaSupported) {
85			valHooks.textarea = hooks;
86			propHooks.value = hooks;
87		}
88
89		$(function() {
90			// Look for forms
91			$(document).delegate('form', 'submit.placeholder', function() {
92				// Clear the placeholder values so they don't get submitted
93				var $inputs = $('.placeholder', this).each(clearPlaceholder);
94				setTimeout(function() {
95					$inputs.each(setPlaceholder);
96				}, 10);
97			});
98		});
99
100		// Clear placeholder values upon page reload
101		$(window).bind('beforeunload.placeholder', function() {
102			$('.placeholder').each(function() {
103				this.value = '';
104			});
105		});
106
107	}
108
109	function args(elem) {
110		// Return an object of element attributes
111		var newAttrs = {};
112		var rinlinejQuery = /^jQuery\d+$/;
113		$.each(elem.attributes, function(i, attr) {
114			if (attr.specified && !rinlinejQuery.test(attr.name)) {
115				newAttrs[attr.name] = attr.value;
116			}
117		});
118		return newAttrs;
119	}
120
121	function clearPlaceholder(event, value) {
122		var input = this;
123		var $input = $(input);
124		if (input.value == $input.attr('placeholder') && $input.hasClass('placeholder')) {
125			if ($input.data('placeholder-password')) {
126				$input = $input.hide().next().show().attr('id', $input.removeAttr('id').data('placeholder-id'));
127				// If `clearPlaceholder` was called from `$.valHooks.input.set`
128				if (event === true) {
129					return $input[0].value = value;
130				}
131				$input.focus();
132			} else {
133				input.value = '';
134				$input.removeClass('placeholder');
135				input == safeActiveElement() && input.select();
136			}
137		}
138	}
139
140	function setPlaceholder() {
141		var $replacement;
142		var input = this;
143		var $input = $(input);
144		var id = this.id;
145		if (input.value == '') {
146			if (input.type == 'password') {
147				if (!$input.data('placeholder-textinput')) {
148					try {
149						$replacement = $input.clone().attr({ 'type': 'text' });
150					} catch(e) {
151						$replacement = $('<input>').attr($.extend(args(this), { 'type': 'text' }));
152					}
153					$replacement
154						.removeAttr('name')
155						.data({
156							'placeholder-password': $input,
157							'placeholder-id': id
158						})
159						.bind('focus.placeholder', clearPlaceholder);
160					$input
161						.data({
162							'placeholder-textinput': $replacement,
163							'placeholder-id': id
164						})
165						.before($replacement);
166				}
167				$input = $input.removeAttr('id').hide().prev().attr('id', id).show();
168				// Note: `$input[0] != input` now!
169			}
170			$input.addClass('placeholder');
171			$input[0].value = $input.attr('placeholder');
172		} else {
173			$input.removeClass('placeholder');
174		}
175	}
176
177	function safeActiveElement() {
178		// Avoid IE9 `document.activeElement` of death
179		// https://github.com/mathiasbynens/jquery-placeholder/pull/99
180		try {
181			return document.activeElement;
182		} catch (exception) {}
183	}
184
185}(this, document, jQuery));