root / astakos / im / static / im / js / jquery.infieldlabel.js @ 1e685275
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1 | 13858d75 | Kostas Papadimitriou | /*
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2 | 13858d75 | Kostas Papadimitriou | * In-Field Label jQuery Plugin
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3 | 13858d75 | Kostas Papadimitriou | * http://fuelyourcoding.com/scripts/infield.html
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4 | 13858d75 | Kostas Papadimitriou | *
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5 | 13858d75 | Kostas Papadimitriou | * Copyright (c) 2009 Doug Neiner
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6 | 13858d75 | Kostas Papadimitriou | * Dual licensed under the MIT and GPL licenses.
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7 | 13858d75 | Kostas Papadimitriou | * Uses the same license as jQuery, see:
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8 | 13858d75 | Kostas Papadimitriou | * http://docs.jquery.com/License
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9 | 13858d75 | Kostas Papadimitriou | *
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10 | 13858d75 | Kostas Papadimitriou | * @version 0.1
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11 | 13858d75 | Kostas Papadimitriou | */
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12 | 13858d75 | Kostas Papadimitriou | (function($){ |
13 | 13858d75 | Kostas Papadimitriou | |
14 | 13858d75 | Kostas Papadimitriou | $.InFieldLabels = function(label,field, options){ |
15 | 13858d75 | Kostas Papadimitriou | // To avoid scope issues, use 'base' instead of 'this'
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16 | 13858d75 | Kostas Papadimitriou | // to reference this class from internal events and functions.
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17 | 13858d75 | Kostas Papadimitriou | var base = this; |
18 | 13858d75 | Kostas Papadimitriou | |
19 | 13858d75 | Kostas Papadimitriou | // Access to jQuery and DOM versions of each element
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20 | 13858d75 | Kostas Papadimitriou | base.$label = $(label); |
21 | 13858d75 | Kostas Papadimitriou | base.label = label; |
22 | 13858d75 | Kostas Papadimitriou | |
23 | 13858d75 | Kostas Papadimitriou | base.$field = $(field); |
24 | 13858d75 | Kostas Papadimitriou | base.field = field; |
25 | 13858d75 | Kostas Papadimitriou | |
26 | 13858d75 | Kostas Papadimitriou | base.$label.data("InFieldLabels", base); |
27 | 13858d75 | Kostas Papadimitriou | base.showing = true;
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28 | 13858d75 | Kostas Papadimitriou | |
29 | 13858d75 | Kostas Papadimitriou | base.init = function(){ |
30 | 13858d75 | Kostas Papadimitriou | // Merge supplied options with default options
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31 | 13858d75 | Kostas Papadimitriou | base.options = $.extend({},$.InFieldLabels.defaultOptions, options); |
32 | 13858d75 | Kostas Papadimitriou | |
33 | 13858d75 | Kostas Papadimitriou | // Check if the field is already filled in
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34 | 13858d75 | Kostas Papadimitriou | if(base.$field.val() != ""){ |
35 | 13858d75 | Kostas Papadimitriou | base.$label.hide();
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36 | 13858d75 | Kostas Papadimitriou | base.showing = false;
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37 | 13858d75 | Kostas Papadimitriou | }; |
38 | 13858d75 | Kostas Papadimitriou | base.$field.focus(function(){ |
39 | 13858d75 | Kostas Papadimitriou | base.fadeOnFocus(); |
40 | 13858d75 | Kostas Papadimitriou | }).blur(function(){
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41 | 13858d75 | Kostas Papadimitriou | base.checkForEmpty(true);
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42 | 13858d75 | Kostas Papadimitriou | }).bind('keydown.infieldlabel',function(e){ |
43 | 13858d75 | Kostas Papadimitriou | // Use of a namespace (.infieldlabel) allows us to
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44 | 13858d75 | Kostas Papadimitriou | // unbind just this method later
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45 | 13858d75 | Kostas Papadimitriou | base.hideOnChange(e); |
46 | 13858d75 | Kostas Papadimitriou | }).change(function(e){
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47 | 13858d75 | Kostas Papadimitriou | base.checkForEmpty(); |
48 | 13858d75 | Kostas Papadimitriou | }).bind('onPropertyChange', function(){ |
49 | 13858d75 | Kostas Papadimitriou | base.checkForEmpty(); |
50 | 13858d75 | Kostas Papadimitriou | }); |
51 | 13858d75 | Kostas Papadimitriou | }; |
52 | 13858d75 | Kostas Papadimitriou | |
53 | 13858d75 | Kostas Papadimitriou | // If the label is currently showing
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54 | 13858d75 | Kostas Papadimitriou | // then fade it down to the amount
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55 | 13858d75 | Kostas Papadimitriou | // specified in the settings
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56 | 13858d75 | Kostas Papadimitriou | base.fadeOnFocus = function(){ |
57 | 13858d75 | Kostas Papadimitriou | if(base.showing){
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58 | 13858d75 | Kostas Papadimitriou | base.setOpacity(base.options.fadeOpacity); |
59 | 13858d75 | Kostas Papadimitriou | }; |
60 | 13858d75 | Kostas Papadimitriou | }; |
61 | 13858d75 | Kostas Papadimitriou | |
62 | 13858d75 | Kostas Papadimitriou | base.setOpacity = function(opacity){ |
63 | 13858d75 | Kostas Papadimitriou | base.$label.stop().animate({ opacity: opacity }, base.options.fadeDuration); |
64 | 13858d75 | Kostas Papadimitriou | base.showing = (opacity > 0.0);
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65 | 13858d75 | Kostas Papadimitriou | }; |
66 | 13858d75 | Kostas Papadimitriou | |
67 | 13858d75 | Kostas Papadimitriou | // Checks for empty as a fail safe
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68 | 13858d75 | Kostas Papadimitriou | // set blur to true when passing from
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69 | 13858d75 | Kostas Papadimitriou | // the blur event
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70 | 13858d75 | Kostas Papadimitriou | base.checkForEmpty = function(blur){ |
71 | 13858d75 | Kostas Papadimitriou | if(base.$field.val() == ""){ |
72 | 13858d75 | Kostas Papadimitriou | base.prepForShow(); |
73 | 13858d75 | Kostas Papadimitriou | base.setOpacity( blur ? 1.0 : base.options.fadeOpacity );
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74 | 13858d75 | Kostas Papadimitriou | } else {
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75 | 13858d75 | Kostas Papadimitriou | base.setOpacity(0.0);
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76 | 13858d75 | Kostas Papadimitriou | }; |
77 | 13858d75 | Kostas Papadimitriou | }; |
78 | 13858d75 | Kostas Papadimitriou | |
79 | 13858d75 | Kostas Papadimitriou | base.prepForShow = function(e){ |
80 | 13858d75 | Kostas Papadimitriou | if(!base.showing) {
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81 | 13858d75 | Kostas Papadimitriou | // Prepare for a animate in...
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82 | 13858d75 | Kostas Papadimitriou | base.$label.css({opacity: 0.0}).show(); |
83 | 13858d75 | Kostas Papadimitriou | |
84 | 13858d75 | Kostas Papadimitriou | // Reattach the keydown event
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85 | 13858d75 | Kostas Papadimitriou | base.$field.bind('keydown.infieldlabel',function(e){ |
86 | 13858d75 | Kostas Papadimitriou | base.hideOnChange(e); |
87 | 13858d75 | Kostas Papadimitriou | }); |
88 | 13858d75 | Kostas Papadimitriou | }; |
89 | 13858d75 | Kostas Papadimitriou | }; |
90 | 13858d75 | Kostas Papadimitriou | |
91 | 13858d75 | Kostas Papadimitriou | base.hideOnChange = function(e){ |
92 | 13858d75 | Kostas Papadimitriou | if(
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93 | 13858d75 | Kostas Papadimitriou | (e.keyCode == 16) || // Skip Shift |
94 | 13858d75 | Kostas Papadimitriou | (e.keyCode == 9) // Skip Tab |
95 | 13858d75 | Kostas Papadimitriou | ) return;
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96 | 13858d75 | Kostas Papadimitriou | |
97 | 13858d75 | Kostas Papadimitriou | if(base.showing){
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98 | 13858d75 | Kostas Papadimitriou | base.$label.hide();
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99 | 13858d75 | Kostas Papadimitriou | base.showing = false;
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100 | 13858d75 | Kostas Papadimitriou | }; |
101 | 13858d75 | Kostas Papadimitriou | |
102 | 13858d75 | Kostas Papadimitriou | // Remove keydown event to save on CPU processing
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103 | 13858d75 | Kostas Papadimitriou | base.$field.unbind('keydown.infieldlabel'); |
104 | 13858d75 | Kostas Papadimitriou | }; |
105 | 13858d75 | Kostas Papadimitriou | |
106 | 13858d75 | Kostas Papadimitriou | // Run the initialization method
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107 | 13858d75 | Kostas Papadimitriou | base.init(); |
108 | 13858d75 | Kostas Papadimitriou | }; |
109 | 13858d75 | Kostas Papadimitriou | |
110 | 13858d75 | Kostas Papadimitriou | $.InFieldLabels.defaultOptions = {
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111 | 13858d75 | Kostas Papadimitriou | fadeOpacity: 0.5, // Once a field has focus, how transparent should the label be |
112 | 13858d75 | Kostas Papadimitriou | fadeDuration: 300 // How long should it take to animate from 1.0 opacity to the fadeOpacity |
113 | 13858d75 | Kostas Papadimitriou | }; |
114 | 13858d75 | Kostas Papadimitriou | |
115 | 13858d75 | Kostas Papadimitriou | |
116 | 13858d75 | Kostas Papadimitriou | $.fn.inFieldLabels = function(options){ |
117 | 13858d75 | Kostas Papadimitriou | return this.each(function(){ |
118 | 13858d75 | Kostas Papadimitriou | // Find input or textarea based on for= attribute
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119 | 13858d75 | Kostas Papadimitriou | // The for attribute on the label must contain the ID
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120 | 13858d75 | Kostas Papadimitriou | // of the input or textarea element
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121 | 13858d75 | Kostas Papadimitriou | var for_attr = $(this).attr('for'); |
122 | 13858d75 | Kostas Papadimitriou | if( !for_attr ) return; // Nothing to attach, since the for field wasn't used |
123 | 13858d75 | Kostas Papadimitriou | |
124 | 13858d75 | Kostas Papadimitriou | |
125 | 13858d75 | Kostas Papadimitriou | // Find the referenced input or textarea element
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126 | 13858d75 | Kostas Papadimitriou | var $field = $( |
127 | 13858d75 | Kostas Papadimitriou | "input#" + for_attr + "[type='text']," + |
128 | 13858d75 | Kostas Papadimitriou | "input#" + for_attr + "[type='password']," + |
129 | 13858d75 | Kostas Papadimitriou | "textarea#" + for_attr
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130 | 13858d75 | Kostas Papadimitriou | ); |
131 | 13858d75 | Kostas Papadimitriou | |
132 | 13858d75 | Kostas Papadimitriou | if( $field.length == 0) return; // Again, nothing to attach |
133 | 13858d75 | Kostas Papadimitriou | |
134 | 13858d75 | Kostas Papadimitriou | // Only create object for input[text], input[password], or textarea
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135 | 13858d75 | Kostas Papadimitriou | (new $.InFieldLabels(this, $field[0], options)); |
136 | 13858d75 | Kostas Papadimitriou | }); |
137 | 13858d75 | Kostas Papadimitriou | }; |
138 | 13858d75 | Kostas Papadimitriou | |
139 | 13858d75 | Kostas Papadimitriou | })(jQuery); |