Frey/jQuery/jquery.tablednd_0_5.js

/**
 * 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
        }

        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
        }
);
1	dpavlin	1026	/**
2			* TableDnD plug-in for JQuery, allows you to drag and drop table rows
3			* You can set up various options to control how the system will work
4			* Copyright (c) Denis Howlett <denish@isocra.com>
5			* Licensed like jQuery, see http://docs.jquery.com/License.
6			*
7			* Configuration options:
8			*
9			* onDragStyle
10			* This is the style that is assigned to the row during drag. There are limitations to the styles that can be
11			* associated with a row (such as you can't assign a border--well you can, but it won't be
12			* displayed). (So instead consider using onDragClass.) The CSS style to apply is specified as
13			* a map (as used in the jQuery css(...) function).
14			* onDropStyle
15			* This is the style that is assigned to the row when it is dropped. As for onDragStyle, there are limitations
16			* to what you can do. Also this replaces the original style, so again consider using onDragClass which
17			* is simply added and then removed on drop.
18			* onDragClass
19			* This class is added for the duration of the drag and then removed when the row is dropped. It is more
20			* flexible than using onDragStyle since it can be inherited by the row cells and other content. The default
21			* is class is tDnD_whileDrag. So to use the default, simply customise this CSS class in your
22			* stylesheet.
23			* onDrop
24			* Pass a function that will be called when the row is dropped. The function takes 2 parameters: the table
25			* and the row that was dropped. You can work out the new order of the rows by using
26			* table.rows.
27			* onDragStart
28			* Pass a function that will be called when the user starts dragging. The function takes 2 parameters: the
29			* table and the row which the user has started to drag.
30			* onAllowDrop
31			* Pass a function that will be called as a row is over another row. If the function returns true, allow
32			* dropping on that row, otherwise not. The function takes 2 parameters: the dragged row and the row under
33			* the cursor. It returns a boolean: true allows the drop, false doesn't allow it.
34			* scrollAmount
35			* This is the number of pixels to scroll if the user moves the mouse cursor to the top or bottom of the
36			* window. The page should automatically scroll up or down as appropriate (tested in IE6, IE7, Safari, FF2,
37			* FF3 beta
38			* dragHandle
39			* This is the name of a class that you assign to one or more cells in each row that is draggable. If you
40			* specify this class, then you are responsible for setting cursor: move in the CSS and only these cells
41			* will have the drag behaviour. If you do not specify a dragHandle, then you get the old behaviour where
42			* the whole row is draggable.
43			*
44			* Other ways to control behaviour:
45			*
46			* Add class="nodrop" to any rows for which you don't want to allow dropping, and class="nodrag" to any rows
47			* that you don't want to be draggable.
48			*
49			* Inside the onDrop method you can also call $.tableDnD.serialize() this returns a string of the form
50			* <tableID>[]=<rowID1>&<tableID>[]=<rowID2> so that you can send this back to the server. The table must have
51			* an ID as must all the rows.
52			*
53			* Other methods:
54			*
55			* $("...").tableDnDUpdate()
56			* Will update all the matching tables, that is it will reapply the mousedown method to the rows (or handle cells).
57			* This is useful if you have updated the table rows using Ajax and you want to make the table draggable again.
58			* The table maintains the original configuration (so you don't have to specify it again).
59			*
60			* $("...").tableDnDSerialize()
61			* Will serialize and return the serialized string as above, but for each of the matching tables--so it can be
62			* called from anywhere and isn't dependent on the currentTable being set up correctly before calling
63			*
64			* Known problems:
65			* - Auto-scoll has some problems with IE7 (it scrolls even when it shouldn't), work-around: set scrollAmount to 0
66			*
67			* Version 0.2: 2008-02-20 First public version
68			* Version 0.3: 2008-02-07 Added onDragStart option
69			* Made the scroll amount configurable (default is 5 as before)
70			* Version 0.4: 2008-03-15 Changed the noDrag/noDrop attributes to nodrag/nodrop classes
71			* Added onAllowDrop to control dropping
72			* Fixed a bug which meant that you couldn't set the scroll amount in both directions
73			* Added serialize method
74			* Version 0.5: 2008-05-16 Changed so that if you specify a dragHandle class it doesn't make the whole row
75			* draggable
76			* Improved the serialize method to use a default (and settable) regular expression.
77			* Added tableDnDupate() and tableDnDSerialize() to be called when you are outside the table
78			*/
79			jQuery.tableDnD = {
80			/** Keep hold of the current table being dragged */
81			currentTable : null,
82			/** Keep hold of the current drag object if any */
83			dragObject: null,
84			/** The current mouse offset */
85			mouseOffset: null,
86			/** Remember the old value of Y so that we don't do too much processing */
87			oldY: 0,
88
89			/** Actually build the structure */
90			build: function(options) {
91			// Set up the defaults if any
92
93			this.each(function() {
94			// This is bound to each matching table, set up the defaults and override with user options
95			this.tableDnDConfig = jQuery.extend({
96			onDragStyle: null,
97			onDropStyle: null,
98			// Add in the default class for whileDragging
99			onDragClass: "tDnD_whileDrag",
100			onDrop: null,
101			onDragStart: null,
102			scrollAmount: 5,
103			serializeRegexp: /[^\-]*$/, // The regular expression to use to trim row IDs
104			serializeParamName: null, // If you want to specify another parameter name instead of the table ID
105			dragHandle: null // If you give the name of a class here, then only Cells with this class will be draggable
106			}, options \|\| {});
107			// Now make the rows draggable
108			jQuery.tableDnD.makeDraggable(this);
109			});
110
111			// Now we need to capture the mouse up and mouse move event
112			// We can use bind so that we don't interfere with other event handlers
113			jQuery(document)
114			.bind('mousemove', jQuery.tableDnD.mousemove)
115			.bind('mouseup', jQuery.tableDnD.mouseup);
116
117			// Don't break the chain
118			return this;
119			},
120
121			/** This function makes all the rows on the table draggable apart from those marked as "NoDrag" */
122			makeDraggable: function(table) {
123			var config = table.tableDnDConfig;
124			if (table.tableDnDConfig.dragHandle) {
125			// We only need to add the event to the specified cells
126			var cells = jQuery("td."+table.tableDnDConfig.dragHandle, table);
127			cells.each(function() {
128			// The cell is bound to "this"
129			jQuery(this).mousedown(function(ev) {
130			jQuery.tableDnD.dragObject = this.parentNode;
131			jQuery.tableDnD.currentTable = table;
132			jQuery.tableDnD.mouseOffset = jQuery.tableDnD.getMouseOffset(this, ev);
133			if (config.onDragStart) {
134			// Call the onDrop method if there is one
135			config.onDragStart(table, this);
136			}
137			return false;
138			});
139			})
140			} else {
141			// For backwards compatibility, we add the event to the whole row
142			var rows = jQuery("tr", table); // get all the rows as a wrapped set
143			rows.each(function() {
144			// Iterate through each row, the row is bound to "this"
145			var row = jQuery(this);
146			if (! row.hasClass("nodrag")) {
147			row.mousedown(function(ev) {
148			if (ev.target.tagName == "TD") {
149			jQuery.tableDnD.dragObject = this;
150			jQuery.tableDnD.currentTable = table;
151			jQuery.tableDnD.mouseOffset = jQuery.tableDnD.getMouseOffset(this, ev);
152			if (config.onDragStart) {
153			// Call the onDrop method if there is one
154			config.onDragStart(table, this);
155			}
156			return false;
157			}
158			}).css("cursor", "move"); // Store the tableDnD object
159			}
160			});
161			}
162			},
163
164			updateTables: function() {
165			this.each(function() {
166			// this is now bound to each matching table
167			if (this.tableDnDConfig) {
168			jQuery.tableDnD.makeDraggable(this);
169			}
170			})
171			},
172
173			/** Get the mouse coordinates from the event (allowing for browser differences) */
174			mouseCoords: function(ev){
175			if(ev.pageX \|\| ev.pageY){
176			return {x:ev.pageX, y:ev.pageY};
177			}
178			return {
179			x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
180			y:ev.clientY + document.body.scrollTop - document.body.clientTop
181			};
182			},
183
184			/** Given a target element and a mouse event, get the mouse offset from that element.
185			To do this we need the element's position and the mouse position */
186			getMouseOffset: function(target, ev) {
187			ev = ev \|\| window.event;
188
189			var docPos = this.getPosition(target);
190			var mousePos = this.mouseCoords(ev);
191			return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};
192			},
193
194			/** Get the position of an element by going up the DOM tree and adding up all the offsets */
195			getPosition: function(e){
196			var left = 0;
197			var top = 0;
198			/** Safari fix -- thanks to Luis Chato for this! */
199			if (e.offsetHeight == 0) {
200			/** Safari 2 doesn't correctly grab the offsetTop of a table row
201			this is detailed here:
202			http://jacob.peargrove.com/blog/2006/technical/table-row-offsettop-bug-in-safari/
203			the solution is likewise noted there, grab the offset of a table cell in the row - the firstChild.
204			note that firefox will return a text node as a first child, so designing a more thorough
205			solution may need to take that into account, for now this seems to work in firefox, safari, ie */
206			e = e.firstChild; // a table cell
207			}
208
209			while (e.offsetParent){
210			left += e.offsetLeft;
211			top += e.offsetTop;
212			e = e.offsetParent;
213			}
214
215			left += e.offsetLeft;
216			top += e.offsetTop;
217
218			return {x:left, y:top};
219			},
220
221			mousemove: function(ev) {
222			if (jQuery.tableDnD.dragObject == null) {
223			return;
224			}
225
226			var dragObj = jQuery(jQuery.tableDnD.dragObject);
227			var config = jQuery.tableDnD.currentTable.tableDnDConfig;
228			var mousePos = jQuery.tableDnD.mouseCoords(ev);
229			var y = mousePos.y - jQuery.tableDnD.mouseOffset.y;
230			//auto scroll the window
231			var yOffset = window.pageYOffset;
232			if (document.all) {
233			// Windows version
234			//yOffset=document.body.scrollTop;
235			if (typeof document.compatMode != 'undefined' &&
236			document.compatMode != 'BackCompat') {
237			yOffset = document.documentElement.scrollTop;
238			}
239			else if (typeof document.body != 'undefined') {
240			yOffset=document.body.scrollTop;
241			}
242
243			}
244
245			if (mousePos.y-yOffset < config.scrollAmount) {
246			window.scrollBy(0, -config.scrollAmount);
247			} else {
248			var windowHeight = window.innerHeight ? window.innerHeight
249			: document.documentElement.clientHeight ? document.documentElement.clientHeight : document.body.clientHeight;
250			if (windowHeight-(mousePos.y-yOffset) < config.scrollAmount) {
251			window.scrollBy(0, config.scrollAmount);
252			}
253			}
254
255
256			if (y != jQuery.tableDnD.oldY) {
257			// work out if we're going up or down...
258			var movingDown = y > jQuery.tableDnD.oldY;
259			// update the old value
260			jQuery.tableDnD.oldY = y;
261			// update the style to show we're dragging
262			if (config.onDragClass) {
263			dragObj.addClass(config.onDragClass);
264			} else {
265			dragObj.css(config.onDragStyle);
266			}
267			// If we're over a row then move the dragged row to there so that the user sees the
268			// effect dynamically
269			var currentRow = jQuery.tableDnD.findDropTargetRow(dragObj, y);
270			if (currentRow) {
271			// TODO worry about what happens when there are multiple TBODIES
272			if (movingDown && jQuery.tableDnD.dragObject != currentRow) {
273			jQuery.tableDnD.dragObject.parentNode.insertBefore(jQuery.tableDnD.dragObject, currentRow.nextSibling);
274			} else if (! movingDown && jQuery.tableDnD.dragObject != currentRow) {
275			jQuery.tableDnD.dragObject.parentNode.insertBefore(jQuery.tableDnD.dragObject, currentRow);
276			}
277			}
278			}
279
280			return false;
281			},
282
283			/** We're only worried about the y position really, because we can only move rows up and down */
284			findDropTargetRow: function(draggedRow, y) {
285			var rows = jQuery.tableDnD.currentTable.rows;
286			for (var i=0; i<rows.length; i++) {
287			var row = rows[i];
288			var rowY = this.getPosition(row).y;
289			var rowHeight = parseInt(row.offsetHeight)/2;
290			if (row.offsetHeight == 0) {
291			rowY = this.getPosition(row.firstChild).y;
292			rowHeight = parseInt(row.firstChild.offsetHeight)/2;
293			}
294			// Because we always have to insert before, we need to offset the height a bit
295			if ((y > rowY - rowHeight) && (y < (rowY + rowHeight))) {
296			// that's the row we're over
297			// If it's the same as the current row, ignore it
298			if (row == draggedRow) {return null;}
299			var config = jQuery.tableDnD.currentTable.tableDnDConfig;
300			if (config.onAllowDrop) {
301			if (config.onAllowDrop(draggedRow, row)) {
302			return row;
303			} else {
304			return null;
305			}
306			} else {
307			// If a row has nodrop class, then don't allow dropping (inspired by John Tarr and Famic)
308			var nodrop = jQuery(row).hasClass("nodrop");
309			if (! nodrop) {
310			return row;
311			} else {
312			return null;
313			}
314			}
315			return row;
316			}
317			}
318			return null;
319			},
320
321			mouseup: function(e) {
322			if (jQuery.tableDnD.currentTable && jQuery.tableDnD.dragObject) {
323			var droppedRow = jQuery.tableDnD.dragObject;
324			var config = jQuery.tableDnD.currentTable.tableDnDConfig;
325			// If we have a dragObject, then we need to release it,
326			// The row will already have been moved to the right place so we just reset stuff
327			if (config.onDragClass) {
328			jQuery(droppedRow).removeClass(config.onDragClass);
329			} else {
330			jQuery(droppedRow).css(config.onDropStyle);
331			}
332			jQuery.tableDnD.dragObject = null;
333			if (config.onDrop) {
334			// Call the onDrop method if there is one
335			config.onDrop(jQuery.tableDnD.currentTable, droppedRow);
336			}
337			jQuery.tableDnD.currentTable = null; // let go of the table too
338			}
339			},
340
341			serialize: function() {
342			if (jQuery.tableDnD.currentTable) {
343			return jQuery.tableDnD.serializeTable(jQuery.tableDnD.currentTable);
344			} else {
345			return "Error: No Table id set, you need to set an id on your table and every row";
346			}
347			},
348
349			serializeTable: function(table) {
350			var result = "";
351			var tableId = table.id;
352			var rows = table.rows;
353			for (var i=0; i<rows.length; i++) {
354			if (result.length > 0) result += "&";
355			var rowId = rows[i].id;
356			if (rowId && rowId && table.tableDnDConfig && table.tableDnDConfig.serializeRegexp) {
357			rowId = rowId.match(table.tableDnDConfig.serializeRegexp)[0];
358			}
359
360			result += tableId + '[]=' + rowId;
361			}
362			return result;
363			},
364
365			serializeTables: function() {
366			var result = "";
367			this.each(function() {
368			// this is now bound to each matching table
369			result += jQuery.tableDnD.serializeTable(this);
370			});
371			return result;
372			}
373
374			}
375
376			jQuery.fn.extend(
377			{
378			tableDnD : jQuery.tableDnD.build,
379			tableDnDUpdate : jQuery.tableDnD.updateTables,
380			tableDnDSerialize: jQuery.tableDnD.serializeTables
381			}
382			);