1 | /** |
---|
2 | * @name Elastic |
---|
3 | * @descripton Elastic is jQuery plugin that grow and shrink your textareas automatically |
---|
4 | * @version 1.6.11 |
---|
5 | * @requires jQuery 1.2.6+ |
---|
6 | * |
---|
7 | * @author Jan Jarfalk |
---|
8 | * @author-email jan.jarfalk@unwrongest.com |
---|
9 | * @author-website http://www.unwrongest.com |
---|
10 | * |
---|
11 | * @licence MIT License - http://www.opensource.org/licenses/mit-license.php |
---|
12 | */ |
---|
13 | |
---|
14 | (function($){ |
---|
15 | jQuery.fn.extend({ |
---|
16 | elastic: function() { |
---|
17 | |
---|
18 | // We will create a div clone of the textarea |
---|
19 | // by copying these attributes from the textarea to the div. |
---|
20 | var mimics = [ |
---|
21 | 'paddingTop', |
---|
22 | 'paddingRight', |
---|
23 | 'paddingBottom', |
---|
24 | 'paddingLeft', |
---|
25 | 'fontSize', |
---|
26 | 'lineHeight', |
---|
27 | 'fontFamily', |
---|
28 | 'width', |
---|
29 | 'fontWeight', |
---|
30 | 'border-top-width', |
---|
31 | 'border-right-width', |
---|
32 | 'border-bottom-width', |
---|
33 | 'border-left-width', |
---|
34 | 'borderTopStyle', |
---|
35 | 'borderTopColor', |
---|
36 | 'borderRightStyle', |
---|
37 | 'borderRightColor', |
---|
38 | 'borderBottomStyle', |
---|
39 | 'borderBottomColor', |
---|
40 | 'borderLeftStyle', |
---|
41 | 'borderLeftColor' |
---|
42 | ]; |
---|
43 | |
---|
44 | return this.each( function() { |
---|
45 | |
---|
46 | // Elastic only works on textareas |
---|
47 | if ( this.type !== 'textarea' ) { |
---|
48 | return false; |
---|
49 | } |
---|
50 | |
---|
51 | var $textarea = jQuery(this), |
---|
52 | $twin = jQuery('<div />').css({ |
---|
53 | 'position' : 'absolute', |
---|
54 | 'display' : 'none', |
---|
55 | 'word-wrap' : 'break-word', |
---|
56 | 'white-space' :'pre-wrap' |
---|
57 | }), |
---|
58 | lineHeight = parseInt($textarea.css('line-height'),10) || parseInt($textarea.css('font-size'),'10'), |
---|
59 | minheight = parseInt($textarea.css('height'),10) || lineHeight*3, |
---|
60 | maxheight = parseInt($textarea.css('max-height'),10) || Number.MAX_VALUE, |
---|
61 | goalheight = 0; |
---|
62 | |
---|
63 | // Opera returns max-height of -1 if not set |
---|
64 | if (maxheight < 0) { maxheight = Number.MAX_VALUE; } |
---|
65 | |
---|
66 | // Append the twin to the DOM |
---|
67 | // We are going to meassure the height of this, not the textarea. |
---|
68 | $twin.appendTo($textarea.parent()); |
---|
69 | |
---|
70 | // Copy the essential styles (mimics) from the textarea to the twin |
---|
71 | var i = mimics.length; |
---|
72 | while(i--){ |
---|
73 | $twin.css(mimics[i].toString(),$textarea.css(mimics[i].toString())); |
---|
74 | } |
---|
75 | |
---|
76 | // Updates the width of the twin. (solution for textareas with widths in percent) |
---|
77 | function setTwinWidth(){ |
---|
78 | var curatedWidth = Math.floor(parseInt($textarea.width(),10)); |
---|
79 | if($twin.width() !== curatedWidth){ |
---|
80 | $twin.css({'width': curatedWidth + 'px'}); |
---|
81 | |
---|
82 | // Update height of textarea |
---|
83 | update(true); |
---|
84 | } |
---|
85 | } |
---|
86 | |
---|
87 | // Sets a given height and overflow state on the textarea |
---|
88 | function setHeightAndOverflow(height, overflow){ |
---|
89 | |
---|
90 | var curratedHeight = Math.floor(parseInt(height,10)); |
---|
91 | if($textarea.height() !== curratedHeight){ |
---|
92 | $textarea.css({'height': curratedHeight + 'px','overflow':overflow}); |
---|
93 | } |
---|
94 | } |
---|
95 | |
---|
96 | // This function will update the height of the textarea if necessary |
---|
97 | function update(forced) { |
---|
98 | |
---|
99 | // Get curated content from the textarea. |
---|
100 | var textareaContent = $textarea.val().replace(/&/g,'&').replace(/ {2}/g, ' ').replace(/<|>/g, '>').replace(/\n/g, '<br />'); |
---|
101 | |
---|
102 | // Compare curated content with curated twin. |
---|
103 | var twinContent = $twin.html().replace(/<br>/ig,'<br />'); |
---|
104 | |
---|
105 | if(forced || textareaContent+' ' !== twinContent){ |
---|
106 | |
---|
107 | // Add an extra white space so new rows are added when you are at the end of a row. |
---|
108 | $twin.html(textareaContent+' '); |
---|
109 | |
---|
110 | // Change textarea height if twin plus the height of one line differs more than 3 pixel from textarea height |
---|
111 | if(Math.abs($twin.height() + lineHeight - $textarea.height()) > 3){ |
---|
112 | |
---|
113 | var goalheight = $twin.height()+lineHeight; |
---|
114 | if(goalheight >= maxheight) { |
---|
115 | setHeightAndOverflow(maxheight,'auto'); |
---|
116 | } else if(goalheight <= minheight) { |
---|
117 | setHeightAndOverflow(minheight,'hidden'); |
---|
118 | } else { |
---|
119 | setHeightAndOverflow(goalheight,'hidden'); |
---|
120 | } |
---|
121 | |
---|
122 | } |
---|
123 | |
---|
124 | } |
---|
125 | |
---|
126 | } |
---|
127 | |
---|
128 | // Hide scrollbars |
---|
129 | $textarea.css({'overflow':'hidden'}); |
---|
130 | |
---|
131 | // Update textarea size on keyup, change, cut and paste |
---|
132 | $textarea.bind('keyup change cut paste', function(){ |
---|
133 | update(); |
---|
134 | }); |
---|
135 | |
---|
136 | // Update width of twin if browser or textarea is resized (solution for textareas with widths in percent) |
---|
137 | $(window).bind('resize', setTwinWidth); |
---|
138 | $textarea.bind('resize', setTwinWidth); |
---|
139 | $textarea.bind('update', update); |
---|
140 | |
---|
141 | // Compact textarea on blur |
---|
142 | $textarea.bind('blur',function(){ |
---|
143 | if($twin.height() < maxheight){ |
---|
144 | if($twin.height() > minheight) { |
---|
145 | $textarea.height($twin.height()); |
---|
146 | } else { |
---|
147 | $textarea.height(minheight); |
---|
148 | } |
---|
149 | } |
---|
150 | }); |
---|
151 | |
---|
152 | // And this line is to catch the browser paste event |
---|
153 | $textarea.bind('input paste',function(e){ setTimeout( update, 250); }); |
---|
154 | |
---|
155 | // Run update once when elastic is initialized |
---|
156 | update(); |
---|
157 | |
---|
158 | }); |
---|
159 | |
---|
160 | } |
---|
161 | }); |
---|
162 | })(jQuery); |
---|