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Diffstat (limited to 'lib/packages/jquery/jquery.tablednd.js')
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1 files changed, 314 insertions, 0 deletions
diff --git a/lib/packages/jquery/jquery.tablednd.js b/lib/packages/jquery/jquery.tablednd.js new file mode 100644 index 0000000..6cf3a85 --- /dev/null +++ b/lib/packages/jquery/jquery.tablednd.js @@ -0,0 +1,314 @@ +/** + * 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 © 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) + * + * 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. + * + * 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 serialise method + */ +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) { + // Make sure options exists + options = options || {}; + // Set up the defaults if any + + this.each(function() { + // Remember the options + this.tableDnDConfig = { + onDragStyle: options.onDragStyle, + onDropStyle: options.onDropStyle, + // Add in the default class for whileDragging + onDragClass: options.onDragClass ? options.onDragClass : "tDnD_whileDrag", + onDrop: options.onDrop, + onDragStart: options.onDragStart, + scrollAmount: options.scrollAmount ? options.scrollAmount : 5 + }; + // 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) { + // Now initialise the rows + var rows = table.rows; //getElementsByTagName("tr") + var config = table.tableDnDConfig; + for (var i=0; i<rows.length; i++) { + // To make non-draggable rows, add the nodrag class (eg for Category and Header rows) + // inspired by John Tarr and Famic + var nodrag = $(rows[i]).hasClass("nodrag"); + if (! nodrag) { //There is no NoDnD attribute on rows I want to drag + jQuery(rows[i]).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 + } + } + }, + + /** 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 = $(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) { + var result = ""; + var tableId = jQuery.tableDnD.currentTable.id; + var rows = jQuery.tableDnD.currentTable.rows; + for (var i=0; i<rows.length; i++) { + if (result.length > 0) result += "&"; + result += tableId + '[]=' + rows[i].id; + } + return result; + } else { + return "Error: No Table id set, you need to set an id on your table and every row"; + } + } +} + +jQuery.fn.extend( + { + tableDnD : jQuery.tableDnD.build + } +);
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