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	/**
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	);