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public/javascripts/vendor/jquery.elastic.js

+/**
+*	@name							Elastic
+*	@descripton						Elastic is jQuery plugin that grow and shrink your textareas automatically
+*	@version						1.6.11
+*	@requires						jQuery 1.2.6+
+*
+*	@author							Jan Jarfalk
+*	@author-email					jan.jarfalk@unwrongest.com
+*	@author-website					http://www.unwrongest.com
+*
+*	@licence						MIT License - http://www.opensource.org/licenses/mit-license.php
+*/
+
+(function($){ 
+	jQuery.fn.extend({  
+		elastic: function() {
+		
+			//	We will create a div clone of the textarea
+			//	by copying these attributes from the textarea to the div.
+			var mimics = [
+				'paddingTop',
+				'paddingRight',
+				'paddingBottom',
+				'paddingLeft',
+				'fontSize',
+				'lineHeight',
+				'fontFamily',
+				'width',
+				'fontWeight',
+				'border-top-width',
+				'border-right-width',
+				'border-bottom-width',
+				'border-left-width',
+				'borderTopStyle',
+				'borderTopColor',
+				'borderRightStyle',
+				'borderRightColor',
+				'borderBottomStyle',
+				'borderBottomColor',
+				'borderLeftStyle',
+				'borderLeftColor'
+				];
+			
+			return this.each( function() {
+
+				// Elastic only works on textareas
+				if ( this.type !== 'textarea' ) {
+					return false;
+				}
+					
+			var $textarea	= jQuery(this),
+				$twin		= jQuery('<div />').css({
+					'position'		: 'absolute',
+					'display'		: 'none',
+					'word-wrap'		: 'break-word',
+					'white-space'	:'pre-wrap'
+				}),
+				lineHeight	= parseInt($textarea.css('line-height'),10) || parseInt($textarea.css('font-size'),'10'),
+				minheight	= parseInt($textarea.css('height'),10) || lineHeight*3,
+				maxheight	= parseInt($textarea.css('max-height'),10) || Number.MAX_VALUE,
+				goalheight	= 0;
+				
+				// Opera returns max-height of -1 if not set
+				if (maxheight < 0) { maxheight = Number.MAX_VALUE; }
+					
+				// Append the twin to the DOM
+				// We are going to meassure the height of this, not the textarea.
+				$twin.appendTo($textarea.parent());
+				
+				// Copy the essential styles (mimics) from the textarea to the twin
+				var i = mimics.length;
+				while(i--){
+					$twin.css(mimics[i].toString(),$textarea.css(mimics[i].toString()));
+				}
+				
+				// Updates the width of the twin. (solution for textareas with widths in percent)
+				function setTwinWidth(){
+					var curatedWidth = Math.floor(parseInt($textarea.width(),10));
+					if($twin.width() !== curatedWidth){
+						$twin.css({'width': curatedWidth + 'px'});
+						
+						// Update height of textarea
+						update(true);
+					}
+				}
+				
+				// Sets a given height and overflow state on the textarea
+				function setHeightAndOverflow(height, overflow){
+				
+					var curratedHeight = Math.floor(parseInt(height,10));
+					if($textarea.height() !== curratedHeight){
+						$textarea.css({'height': curratedHeight + 'px','overflow':overflow});
+					}
+				}
+				
+				// This function will update the height of the textarea if necessary 
+				function update(forced) {
+					
+					// Get curated content from the textarea.
+					var textareaContent = $textarea.val().replace(/&/g,'&amp;').replace(/ {2}/g, '&nbsp;').replace(/<|>/g, '&gt;').replace(/\n/g, '<br />');
+					
+					// Compare curated content with curated twin.
+					var twinContent = $twin.html().replace(/<br>/ig,'<br />');
+					
+					if(forced || textareaContent+'&nbsp;' !== twinContent){
+					
+						// Add an extra white space so new rows are added when you are at the end of a row.
+						$twin.html(textareaContent+'&nbsp;');
+						
+						// Change textarea height if twin plus the height of one line differs more than 3 pixel from textarea height
+						if(Math.abs($twin.height() + lineHeight - $textarea.height()) > 3){
+							
+							var goalheight = $twin.height()+lineHeight;
+							if(goalheight >= maxheight) {
+								setHeightAndOverflow(maxheight,'auto');
+							} else if(goalheight <= minheight) {
+								setHeightAndOverflow(minheight,'hidden');
+							} else {
+								setHeightAndOverflow(goalheight,'hidden');
+							}
+							
+						}
+						
+					}
+					
+				}
+				
+				// Hide scrollbars
+				$textarea.css({'overflow':'hidden'});
+				
+				// Update textarea size on keyup, change, cut and paste
+				$textarea.bind('keyup change cut paste', function(){
+					update(); 
+				});
+				
+				// Update width of twin if browser or textarea is resized (solution for textareas with widths in percent)
+				$(window).bind('resize', setTwinWidth);
+				$textarea.bind('resize', setTwinWidth);
+				$textarea.bind('update', update);
+				
+				// Compact textarea on blur
+				$textarea.bind('blur',function(){
+					if($twin.height() < maxheight){
+						if($twin.height() > minheight) {
+							$textarea.height($twin.height());
+						} else {
+							$textarea.height(minheight);
+						}
+					}
+				});
+				
+				// And this line is to catch the browser paste event
+				$textarea.bind('input paste',function(e){ setTimeout( update, 250); });				
+				
+				// Run update once when elastic is initialized
+				update();
+				
+			});
+			
+        } 
+    }); 
+})(jQuery);
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