Dodanie automatycznego rozszerzania się textarea (jquery.elastic.js) i rusztowania...

[redakcja.git] / platforma / static / js / jquery.elastic.js

diff --git a/platforma/static/js/jquery.elastic.js b/platforma/static/js/jquery.elastic.js
new file mode 100644 (file)
index 0000000..a0d8719
--- /dev/null
+++ b/platforma/static/js/jquery.elastic.js
@@ -0,0 +1,117 @@
+/**
+*      @name                                                   Elastic
+*      @descripton                                             Elastic is Jquery plugin that grow and shrink your textareas automaticliy
+*      @version                                                1.6.3
+*      @requires                                               Jquery 1.2.6+
+*
+*      @author                                                 Jan Jarfalk
+*      @author-email                                   jan.jarfalk@unwrongest.com
+*      @author-website                                 http://www.unwrongest.com
+*
+*      @licens                                                 MIT License - http://www.opensource.org/licenses/mit-license.php
+*/
+
+(function(jQuery){ 
+       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'];
+                       
+                       return this.each( function() {
+                               
+                               // Elastic only works on textareas
+                               if ( this.type != 'textarea' ) {
+                                       return false;
+                               }
+                               
+                               var $textarea   =       jQuery(this),
+                                       $twin           =       jQuery('<div />').css({'position': 'absolute','display':'none','word-wrap':'break-word'}),
+                                       lineHeight      =       parseInt($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,
+                                       i                       =       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()));
+                               }
+                               
+                               
+                               // Sets a given height and overflow state on the textarea
+                               function setHeightAndOverflow(height, overflow){
+                                       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() {
+                                       
+                                       // Get curated content from the textarea.
+                                       var textareaContent = $textarea.val().replace(/&/g,'&amp;').replace(/  /g, '&nbsp;').replace(/<|>/g, '&gt;').replace(/\n/g, '<br />');
+
+                                       var twinContent = $twin.html();
+                                       
+                                       if(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
+                               $textarea.keyup(function(){ update(); });
+                               
+                               // And this line is to catch the browser paste event
+                               $textarea.live('input paste',function(e){ setTimeout( update, 250); });                         
+                               
+                               // Run update once when elastic is initialized
+                               update();
+                               
+                       });
+                       
+        } 
+    }); 
+})(jQuery);
\ No newline at end of file