text: /**
   * TableDnD plug-in for JQuery, allows you to drag and drop table rows
   * You can set up various options to control how the system will work
   * Copyright (c) Denis Howlett <denish@isocra.com>
   * Licensed like jQuery, see http://docs.jquery.com/License.
   *
   * Configuration options:
   *
   * onDragStyle
   *     This is the style that is assigned to the row during drag. There are limitations to the styles that can be
   *     associated with a row (such as you can't assign a border--well you can, but it won't be
   *     displayed). (So instead consider using onDragClass.) The CSS style to apply is specified as
   *     a map (as used in the jQuery css(...) function).
   * onDropStyle
   *     This is the style that is assigned to the row when it is dropped. As for onDragStyle, there are limitations
   *     to what you can do. Also this replaces the original style, so again consider using onDragClass which
   *     is simply added and then removed on drop.
   * onDragClass
   *     This class is added for the duration of the drag and then removed when the row is dropped. It is more
   *     flexible than using onDragStyle since it can be inherited by the row cells and other content. The default
   *     is class is tDnD_whileDrag. So to use the default, simply customise this CSS class in your
   *     stylesheet.
   * onDrop
   *     Pass a function that will be called when the row is dropped. The function takes 2 parameters: the table
   *     and the row that was dropped. You can work out the new order of the rows by using
   *     table.rows.
   * onDragStart
   *     Pass a function that will be called when the user starts dragging. The function takes 2 parameters: the
   *     table and the row which the user has started to drag.
   * onAllowDrop
   *     Pass a function that will be called as a row is over another row. If the function returns true, allow
   *     dropping on that row, otherwise not. The function takes 2 parameters: the dragged row and the row under
   *     the cursor. It returns a boolean: true allows the drop, false doesn't allow it.
   * scrollAmount
   *     This is the number of pixels to scroll if the user moves the mouse cursor to the top or bottom of the
   *     window. The page should automatically scroll up or down as appropriate (tested in IE6, IE7, Safari, FF2,
   *     FF3 beta
   * dragHandle
   *     This is the name of a class that you assign to one or more cells in each row that is draggable. If you
   *     specify this class, then you are responsible for setting cursor: move in the CSS and only these cells
   *     will have the drag behaviour. If you do not specify a dragHandle, then you get the old behaviour where
   *     the whole row is draggable.
   *
   * Other ways to control behaviour:
   *
   * Add class="nodrop" to any rows for which you don't want to allow dropping, and class="nodrag" to any rows
   * that you don't want to be draggable.
   *
   * Inside the onDrop method you can also call $.tableDnD.serialize() this returns a string of the form
   * <tableID>[]=<rowID1>&<tableID>[]=<rowID2> so that you can send this back to the server. The table must have
   * an ID as must all the rows.
   *
   * Other methods:
   *
   * $("...").tableDnDUpdate()
   * Will update all the matching tables, that is it will reapply the mousedown method to the rows (or handle cells).
   * This is useful if you have updated the table rows using Ajax and you want to make the table draggable again.
   * The table maintains the original configuration (so you don't have to specify it again).
   *
   * $("...").tableDnDSerialize()
   * Will serialize and return the serialized string as above, but for each of the matching tables--so it can be
   * called from anywhere and isn't dependent on the currentTable being set up correctly before calling
   *
   * Known problems:
   * - Auto-scoll has some problems with IE7  (it scrolls even when it shouldn't), work-around: set scrollAmount to 0
   *
   * Version 0.2: 2008-02-20 First public version
   * Version 0.3: 2008-02-07 Added onDragStart option
   *                         Made the scroll amount configurable (default is 5 as before)
   * Version 0.4: 2008-03-15 Changed the noDrag/noDrop attributes to nodrag/nodrop classes
   *                         Added onAllowDrop to control dropping
   *                         Fixed a bug which meant that you couldn't set the scroll amount in both directions
   *                         Added serialize method
   * Version 0.5: 2008-05-16 Changed so that if you specify a dragHandle class it doesn't make the whole row
   *                         draggable
   *                         Improved the serialize method to use a default (and settable) regular expression.
   *                         Added tableDnDupate() and tableDnDSerialize() to be called when you are outside the table
   */
  jQuery.tableDnD = {
      /** Keep hold of the current table being dragged */
      currentTable : null,
      /** Keep hold of the current drag object if any */
      dragObject: null,
      /** The current mouse offset */
      mouseOffset: null,
      /** Remember the old value of Y so that we don't do too much processing */
      oldY: 0,
  
      /** Actually build the structure */
      build: function(options) {
          // Set up the defaults if any
  
          this.each(function() {
              // This is bound to each matching table, set up the defaults and override with user options
              this.tableDnDConfig = jQuery.extend({
                  onDragStyle: null,
                  onDropStyle: null,
  				// Add in the default class for whileDragging
  				onDragClass: "tDnD_whileDrag",
                  onDrop: null,
                  onDragStart: null,
                  scrollAmount: 5,
  				serializeRegexp: /[^\-]*$/, // The regular expression to use to trim row IDs
  				serializeParamName: null, // If you want to specify another parameter name instead of the table ID
                  dragHandle: null // If you give the name of a class here, then only Cells with this class will be draggable
              }, options || {});
              // Now make the rows draggable
              jQuery.tableDnD.makeDraggable(this);
          });
  
          // Now we need to capture the mouse up and mouse move event
          // We can use bind so that we don't interfere with other event handlers
          jQuery(document)
              .bind('mousemove', jQuery.tableDnD.mousemove)
              .bind('mouseup', jQuery.tableDnD.mouseup);
  
          // Don't break the chain
          return this;
      },
  
      /** This function makes all the rows on the table draggable apart from those marked as "NoDrag" */
      makeDraggable: function(table) {
          var config = table.tableDnDConfig;
  		if (table.tableDnDConfig.dragHandle) {
  			// We only need to add the event to the specified cells
  			var cells = jQuery("td."+table.tableDnDConfig.dragHandle, table);
  			cells.each(function() {
  				// The cell is bound to "this"
                  jQuery(this).mousedown(function(ev) {
                      jQuery.tableDnD.dragObject = this.parentNode;
                      jQuery.tableDnD.currentTable = table;
                      jQuery.tableDnD.mouseOffset = jQuery.tableDnD.getMouseOffset(this, ev);
                      if (config.onDragStart) {
                          // Call the onDrop method if there is one
                          config.onDragStart(table, this);
                      }
                      return false;
                  });
  			})
  		} else {
  			// For backwards compatibility, we add the event to the whole row
  	        var rows = jQuery("tr", table); // get all the rows as a wrapped set
  	        rows.each(function() {
  				// Iterate through each row, the row is bound to "this"
  				var row = jQuery(this);
  				if (! row.hasClass("nodrag")) {
  	                row.mousedown(function(ev) {
  	                    if (ev.target.tagName == "TD") {
  	                        jQuery.tableDnD.dragObject = this;
  	                        jQuery.tableDnD.currentTable = table;
  	                        jQuery.tableDnD.mouseOffset = jQuery.tableDnD.getMouseOffset(this, ev);
  	                        if (config.onDragStart) {
  	                            // Call the onDrop method if there is one
  	                            config.onDragStart(table, this);
  	                        }
  	                        return false;
  	                    }
  	                }).css("cursor", "move"); // Store the tableDnD object
  				}
  			});
  		}
  	},
  
  	updateTables: function() {
  		this.each(function() {
  			// this is now bound to each matching table
  			if (this.tableDnDConfig) {
  				jQuery.tableDnD.makeDraggable(this);
  			}
  		})
  	},
  
      /** Get the mouse coordinates from the event (allowing for browser differences) */
      mouseCoords: function(ev){
          if(ev.pageX || ev.pageY){
              return {x:ev.pageX, y:ev.pageY};
          }
          return {
              x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
              y:ev.clientY + document.body.scrollTop  - document.body.clientTop
          };
      },
  
      /** Given a target element and a mouse event, get the mouse offset from that element.
          To do this we need the element's position and the mouse position */
      getMouseOffset: function(target, ev) {
          ev = ev || window.event;
  
          var docPos    = this.getPosition(target);
          var mousePos  = this.mouseCoords(ev);
          return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};
      },
  
      /** Get the position of an element by going up the DOM tree and adding up all the offsets */
      getPosition: function(e){
          var left = 0;
          var top  = 0;
          /** Safari fix -- thanks to Luis Chato for this! */
          if (e.offsetHeight == 0) {
              /** Safari 2 doesn't correctly grab the offsetTop of a table row
              this is detailed here:
              http://jacob.peargrove.com/blog/2006/technical/table-row-offsettop-bug-in-safari/
              the solution is likewise noted there, grab the offset of a table cell in the row - the firstChild.
              note that firefox will return a text node as a first child, so designing a more thorough
              solution may need to take that into account, for now this seems to work in firefox, safari, ie */
              e = e.firstChild; // a table cell
          }
  		if (e && e.offsetParent) {
          	while (e.offsetParent){
              	left += e.offsetLeft;
              	top  += e.offsetTop;
              	e     = e.offsetParent;
          	}
  
          	left += e.offsetLeft;
          	top  += e.offsetTop;
          }
  
          return {x:left, y:top};
      },
  
      mousemove: function(ev) {
          if (jQuery.tableDnD.dragObject == null) {
              return;
          }
  
          var dragObj = jQuery(jQuery.tableDnD.dragObject);
          var config = jQuery.tableDnD.currentTable.tableDnDConfig;
          var mousePos = jQuery.tableDnD.mouseCoords(ev);
          var y = mousePos.y - jQuery.tableDnD.mouseOffset.y;
          //auto scroll the window
  	    var yOffset = window.pageYOffset;
  	 	if (document.all) {
  	        // Windows version
  	        //yOffset=document.body.scrollTop;
  	        if (typeof document.compatMode != 'undefined' &&
  	             document.compatMode != 'BackCompat') {
  	           yOffset = document.documentElement.scrollTop;
  	        }
  	        else if (typeof document.body != 'undefined') {
  	           yOffset=document.body.scrollTop;
  	        }
  
  	    }
  
  		if (mousePos.y-yOffset < config.scrollAmount) {
  	    	window.scrollBy(0, -config.scrollAmount);
  	    } else {
              var windowHeight = window.innerHeight ? window.innerHeight
                      : document.documentElement.clientHeight ? document.documentElement.clientHeight : document.body.clientHeight;
              if (windowHeight-(mousePos.y-yOffset) < config.scrollAmount) {
                  window.scrollBy(0, config.scrollAmount);
              }
          }
  
  
          if (y != jQuery.tableDnD.oldY) {
              // work out if we're going up or down...
              var movingDown = y > jQuery.tableDnD.oldY;
              // update the old value
              jQuery.tableDnD.oldY = y;
              // update the style to show we're dragging
  			if (config.onDragClass) {
  				dragObj.addClass(config.onDragClass);
  			} else {
  	            dragObj.css(config.onDragStyle);
  			}
              // If we're over a row then move the dragged row to there so that the user sees the
              // effect dynamically
              var currentRow = jQuery.tableDnD.findDropTargetRow(dragObj, y);
              if (currentRow) {
                  // TODO worry about what happens when there are multiple TBODIES
                  if (movingDown && jQuery.tableDnD.dragObject != currentRow) {
                      jQuery.tableDnD.dragObject.parentNode.insertBefore(jQuery.tableDnD.dragObject, currentRow.nextSibling);
                  } else if (! movingDown && jQuery.tableDnD.dragObject != currentRow) {
                      jQuery.tableDnD.dragObject.parentNode.insertBefore(jQuery.tableDnD.dragObject, currentRow);
                  }
              }
          }
  
          return false;
      },
  
      /** We're only worried about the y position really, because we can only move rows up and down */
      findDropTargetRow: function(draggedRow, y) {
          var rows = jQuery.tableDnD.currentTable.rows;
          for (var i=0; i<rows.length; i++) {
              var row = rows[i];
              var rowY    = this.getPosition(row).y;
              var rowHeight = parseInt(row.offsetHeight)/2;
              if (row.offsetHeight == 0) {
                  rowY = this.getPosition(row.firstChild).y;
                  rowHeight = parseInt(row.firstChild.offsetHeight)/2;
              }
              // Because we always have to insert before, we need to offset the height a bit
              if ((y > rowY - rowHeight) && (y < (rowY + rowHeight))) {
                  // that's the row we're over
  				// If it's the same as the current row, ignore it
  				if (row == draggedRow) {return null;}
                  var config = jQuery.tableDnD.currentTable.tableDnDConfig;
                  if (config.onAllowDrop) {
                      if (config.onAllowDrop(draggedRow, row)) {
                          return row;
                      } else {
                          return null;
                      }
                  } else {
  					// If a row has nodrop class, then don't allow dropping (inspired by John Tarr and Famic)
                      var nodrop = jQuery(row).hasClass("nodrop");
                      if (! nodrop) {
                          return row;
                      } else {
                          return null;
                      }
                  }
                  return row;
              }
          }
          return null;
      },
  
      mouseup: function(e) {
          if (jQuery.tableDnD.currentTable && jQuery.tableDnD.dragObject) {
              var droppedRow = jQuery.tableDnD.dragObject;
              var config = jQuery.tableDnD.currentTable.tableDnDConfig;
              // If we have a dragObject, then we need to release it,
              // The row will already have been moved to the right place so we just reset stuff
  			if (config.onDragClass) {
  	            jQuery(droppedRow).removeClass(config.onDragClass);
  			} else {
  	            jQuery(droppedRow).css(config.onDropStyle);
  			}
              jQuery.tableDnD.dragObject   = null;
              if (config.onDrop) {
                  // Call the onDrop method if there is one
                  config.onDrop(jQuery.tableDnD.currentTable, droppedRow);
              }
              jQuery.tableDnD.currentTable = null; // let go of the table too
          }
      },
  
      serialize: function() {
          if (jQuery.tableDnD.currentTable) {
              return jQuery.tableDnD.serializeTable(jQuery.tableDnD.currentTable);
          } else {
              return "Error: No Table id set, you need to set an id on your table and every row";
          }
      },
  
  	serializeTable: function(table) {
          var result = "";
          var tableId = table.id;
          var rows = table.rows;
          for (var i=0; i<rows.length; i++) {
              if (result.length > 0) result += "&";
              var rowId = rows[i].id;
              if (rowId && rowId && table.tableDnDConfig && table.tableDnDConfig.serializeRegexp) {
                  rowId = rowId.match(table.tableDnDConfig.serializeRegexp)[0];
              }
  
              result += tableId + '[]=' + rowId;
          }
          return result;
  	},
  
  	serializeTables: function() {
          var result = "";
          this.each(function() {
  			// this is now bound to each matching table
  			result += jQuery.tableDnD.serializeTable(this);
  		});
          return result;
      }
  
  }
  
  jQuery.fn.extend(
  	{
  		tableDnD : jQuery.tableDnD.build,
  		tableDnDUpdate : jQuery.tableDnD.updateTables,
  		tableDnDSerialize: jQuery.tableDnD.serializeTables
  	}
  );
  