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