https://www.cyberstep.com/js/jquery.infieldlabel.js

1/*
2 * In-Field Label jQuery Plugin + 少しカスタマイズ
3 * http://fuelyourcoding.com/scripts/infield.html
4 *
5 * Copyright (c) 2009 Doug Neiner
6 * Dual licensed under the MIT and GPL licenses.
7 * Uses the same license as jQuery, see:
8 * http://docs.jquery.com/License
9 *
10 * @version 0.1
11 */
12(function($){
13
14    $.InFieldLabels = function(label,field, options){
15        // To avoid scope issues, use 'base' instead of 'this'
16        // to reference this class from internal events and functions.
17        var base = this;
18        
19        // Access to jQuery and DOM versions of each element
20        base.$label = $(label);
21        base.label = label;
22
23 		base.$field = $(field);
24		base.field = field;
25        
26		base.$label.data("InFieldLabels", base);
27		base.showing = true;
28        
29        base.init = function(){
30			// Merge supplied options with default options
31            base.options = $.extend({},$.InFieldLabels.defaultOptions, options);
32
33			// Check if the field is already filled in
34			if(base.$field.val() != ""){
35				base.$label.hide();
36				base.showing = false;
37			};
38			
39			base.$field.focus(function(){
40				base.fadeOnFocus();
41			}).blur(function(){
42				base.checkForEmpty(true);
43			}).bind('keydown.infieldlabel',function(e){
44				// Use of a namespace (.infieldlabel) allows us to
45				// unbind just this method later
46				base.hideOnChange(e);
47			}).change(function(e){
48				base.checkForEmpty();
49			}).bind('onPropertyChange', function(){
50				base.checkForEmpty();
51			});
52        };
53
54		// If the label is currently showing
55		// then fade it down to the amount
56		// specified in the settings
57		base.fadeOnFocus = function(){
58			if(base.showing){
59				base.setOpacity(base.options.fadeOpacity);
60			};
61		};
62		
63		base.setOpacity = function(opacity){
64			base.$label.stop().animate({ opacity: opacity }, base.options.fadeDuration);
65			base.showing = (opacity > 0.0);
66		};
67		
68		// Checks for empty as a fail safe
69		// set blur to true when passing from
70		// the blur event
71		base.checkForEmpty = function(blur){
72			if(base.$field.val() == ""){
73				base.prepForShow();
74				base.setOpacity( blur ? 1.0 : base.options.fadeOpacity );
75			} else {
76				base.setOpacity(0.0);
77			};
78		};
79		
80		base.prepForShow = function(e){
81			if(!base.showing) {
82				// Prepare for a animate in...
83				base.$label.css({opacity: 0.0}).show();
84				
85				// Reattach the keydown event
86				base.$field.bind('keydown.infieldlabel',function(e){
87					base.hideOnChange(e);
88				});
89			};
90		};
91
92		base.hideOnChange = function(e){
93			if(
94				(e.keyCode == 16) || // Skip Shift
95				(e.keyCode == 9) // Skip Tab
96			  ) return; 
97			
98			if(base.showing){
99				base.$label.hide();
100				base.showing = false;
101			};
102			
103			// Remove keydown event to save on CPU processing
104			base.$field.unbind('keydown.infieldlabel');
105		};
106      
107		// Run the initialization method
108        base.init();
109    };
110	
111    $.InFieldLabels.defaultOptions = {
112        fadeOpacity: 0.5, // Once a field has focus, how transparent should the label be
113		fadeDuration: 300 // How long should it take to animate from 1.0 opacity to the fadeOpacity
114    };
115	
116
117    $.fn.inFieldLabels = function(options){
118        return this.each(function(){
119			// Find input or textarea based on for= attribute
120			// The for attribute on the label must contain the ID
121			// of the input or textarea element
122			var for_attr = $(this).attr('for');
123			if( !for_attr ) return; // Nothing to attach, since the for field wasn't used
124			
125			
126			// Find the referenced input or textarea element
127			// ここにinputのemailにも対応させるように追加しました
128			var $field = $(
129				"input#" + for_attr + "[type='text']," + 
130				"input#" + for_attr + "[type='password']," + 
131				"input#" + for_attr + "[type='email']," + 
132				"textarea#" + for_attr
133				);
134				
135			if( $field.length == 0) return; // Again, nothing to attach
136			
137			// Only create object for input[text], input[password], or textarea
138            (new $.InFieldLabels(this, $field[0], options));
139        });
140    };
141	
142})(jQuery);