[5417] | 1 | /** |
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| 2 | * @name Elastic |
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| 3 | * @descripton Elastic is jQuery plugin that grow and shrink your textareas automatically |
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| 4 | * @version 1.6.11 |
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| 5 | * @requires jQuery 1.2.6+ |
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| 6 | * |
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| 7 | * @author Jan Jarfalk |
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| 8 | * @author-email jan.jarfalk@unwrongest.com |
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| 9 | * @author-website http://www.unwrongest.com |
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| 10 | * |
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| 11 | * @licence MIT License - http://www.opensource.org/licenses/mit-license.php |
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| 12 | */ |
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| 13 | |
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| 14 | (function($){ |
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| 15 | jQuery.fn.extend({ |
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| 16 | elastic: function() { |
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| 17 | |
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| 18 | // We will create a div clone of the textarea |
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| 19 | // by copying these attributes from the textarea to the div. |
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| 20 | var mimics = [ |
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| 21 | 'paddingTop', |
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| 22 | 'paddingRight', |
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| 23 | 'paddingBottom', |
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| 24 | 'paddingLeft', |
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| 25 | 'fontSize', |
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| 26 | 'lineHeight', |
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| 27 | 'fontFamily', |
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| 28 | 'width', |
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| 29 | 'fontWeight', |
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| 30 | 'border-top-width', |
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| 31 | 'border-right-width', |
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| 32 | 'border-bottom-width', |
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| 33 | 'border-left-width', |
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| 34 | 'borderTopStyle', |
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| 35 | 'borderTopColor', |
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| 36 | 'borderRightStyle', |
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| 37 | 'borderRightColor', |
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| 38 | 'borderBottomStyle', |
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| 39 | 'borderBottomColor', |
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| 40 | 'borderLeftStyle', |
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| 41 | 'borderLeftColor' |
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| 42 | ]; |
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| 43 | |
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| 44 | return this.each( function() { |
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| 45 | |
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| 46 | // Elastic only works on textareas |
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| 47 | if ( this.type !== 'textarea' ) { |
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| 48 | return false; |
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| 49 | } |
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| 50 | |
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| 51 | var $textarea = jQuery(this), |
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| 52 | $twin = jQuery('<div />').css({ |
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| 53 | 'position' : 'absolute', |
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| 54 | 'display' : 'none', |
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| 55 | 'word-wrap' : 'break-word', |
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| 56 | 'white-space' :'pre-wrap' |
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| 57 | }), |
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| 58 | lineHeight = parseInt($textarea.css('line-height'),10) || parseInt($textarea.css('font-size'),'10'), |
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| 59 | minheight = parseInt($textarea.css('height'),10) || lineHeight*3, |
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| 60 | maxheight = parseInt($textarea.css('max-height'),10) || Number.MAX_VALUE, |
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| 61 | goalheight = 0; |
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| 62 | |
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| 63 | // Opera returns max-height of -1 if not set |
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| 64 | if (maxheight < 0) { maxheight = Number.MAX_VALUE; } |
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| 65 | |
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| 66 | // Append the twin to the DOM |
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| 67 | // We are going to meassure the height of this, not the textarea. |
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| 68 | $twin.appendTo($textarea.parent()); |
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| 69 | |
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| 70 | // Copy the essential styles (mimics) from the textarea to the twin |
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| 71 | var i = mimics.length; |
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| 72 | while(i--){ |
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| 73 | $twin.css(mimics[i].toString(),$textarea.css(mimics[i].toString())); |
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| 74 | } |
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| 75 | |
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| 76 | // Updates the width of the twin. (solution for textareas with widths in percent) |
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| 77 | function setTwinWidth(){ |
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| 78 | var curatedWidth = Math.floor(parseInt($textarea.width(),10)); |
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| 79 | if($twin.width() !== curatedWidth){ |
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| 80 | $twin.css({'width': curatedWidth + 'px'}); |
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| 81 | |
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| 82 | // Update height of textarea |
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| 83 | update(true); |
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| 84 | } |
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| 85 | } |
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| 86 | |
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| 87 | // Sets a given height and overflow state on the textarea |
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| 88 | function setHeightAndOverflow(height, overflow){ |
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| 89 | |
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| 90 | var curratedHeight = Math.floor(parseInt(height,10)); |
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| 91 | if($textarea.height() !== curratedHeight){ |
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| 92 | $textarea.css({'height': curratedHeight + 'px','overflow':overflow}); |
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| 93 | } |
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| 94 | } |
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| 95 | |
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| 96 | // This function will update the height of the textarea if necessary |
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| 97 | function update(forced) { |
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| 98 | |
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| 99 | // Get curated content from the textarea. |
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| 100 | var textareaContent = $textarea.val().replace(/&/g,'&').replace(/ {2}/g, ' ').replace(/<|>/g, '>').replace(/\n/g, '<br />'); |
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| 101 | |
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| 102 | // Compare curated content with curated twin. |
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| 103 | var twinContent = $twin.html().replace(/<br>/ig,'<br />'); |
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| 104 | |
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| 105 | if(forced || textareaContent+' ' !== twinContent){ |
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| 106 | |
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| 107 | // Add an extra white space so new rows are added when you are at the end of a row. |
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| 108 | $twin.html(textareaContent+' '); |
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| 109 | |
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| 110 | // Change textarea height if twin plus the height of one line differs more than 3 pixel from textarea height |
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| 111 | if(Math.abs($twin.height() + lineHeight - $textarea.height()) > 3){ |
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| 112 | |
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| 113 | var goalheight = $twin.height()+lineHeight; |
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| 114 | if(goalheight >= maxheight) { |
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| 115 | setHeightAndOverflow(maxheight,'auto'); |
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| 116 | } else if(goalheight <= minheight) { |
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| 117 | setHeightAndOverflow(minheight,'hidden'); |
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| 118 | } else { |
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| 119 | setHeightAndOverflow(goalheight,'hidden'); |
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| 120 | } |
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| 121 | |
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| 122 | } |
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| 123 | |
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| 124 | } |
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| 125 | |
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| 126 | } |
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| 127 | |
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| 128 | // Hide scrollbars |
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| 129 | $textarea.css({'overflow':'hidden'}); |
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| 130 | |
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| 131 | // Update textarea size on keyup, change, cut and paste |
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| 132 | $textarea.bind('keyup change cut paste', function(){ |
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| 133 | update(); |
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| 134 | }); |
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| 135 | |
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| 136 | // Update width of twin if browser or textarea is resized (solution for textareas with widths in percent) |
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| 137 | $(window).bind('resize', setTwinWidth); |
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| 138 | $textarea.bind('resize', setTwinWidth); |
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| 139 | $textarea.bind('update', update); |
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| 140 | |
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| 141 | // Compact textarea on blur |
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| 142 | $textarea.bind('blur',function(){ |
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| 143 | if($twin.height() < maxheight){ |
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| 144 | if($twin.height() > minheight) { |
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| 145 | $textarea.height($twin.height()); |
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| 146 | } else { |
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| 147 | $textarea.height(minheight); |
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| 148 | } |
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| 149 | } |
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| 150 | }); |
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| 151 | |
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| 152 | // And this line is to catch the browser paste event |
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| 153 | $textarea.bind('input paste',function(e){ setTimeout( update, 250); }); |
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| 154 | |
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| 155 | // Run update once when elastic is initialized |
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| 156 | update(); |
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| 157 | |
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| 158 | }); |
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| 159 | |
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| 160 | } |
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| 161 | }); |
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| 162 | })(jQuery); |
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