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File: tablednd.js
/**
 * functions/tablednd.js
 *
 * Copyright (c) 2013-2019 Simon Fraser University
 * Copyright (c) 2003-2019 John Willinsky
 * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
 *
 * Setup a table for dragging and dropping.
 *
 * Depends on the jquery.tablednd library.
 */

/**
 * Setup a table for dragging and dropping rows.
 */
function setupTableDND(tableID, moveHandler) {
	$(tableID).tableDnD({
		// add this class to cells to make them handles for dragging the row
		dragHandle: "drag",

		onDrop: function(table, row) {
			// find the row we dropped on
			var rows = table.tBodies[0].rows;
			var prevRowId = null;
			var nextRowId = null;
			for (var i=0; i<rows.length; i++) {
				if (rows[i].id) { // skip nondata rows
					if (rows[i].id == row.id) {
						if (i+1 < rows.length) {
							nextRowId = rows[i+1].id.split(/-/)[1];
							break;
						}
					} else {
						prevRowId = rows[i].id.split(/-/)[1];
					}
				}
			}
			// update the sequence in the database
			var req = makeAsyncRequest();

			// id's are "context-##", remove the "context-"
			var url = moveHandler + '?id=' + row.id.split(/-/)[1];

			// The prevId sent to the moveHandler so it can
			// sequence our dropped item immediately after it.  If
			// we are dropping above the first visible item we
			// instead pass the id of the next item, so the
			// moveHandler can sequence this item after it.  This
			// deals with the special case where we are dragging
			// and dropping on a multi-page table where the first
			// item in the displayed view is not the very first
			// item in the entire sequence.
			if (prevRowId != null) url += '&prevId=' + prevRowId;
			else url += '&nextId=' + nextRowId;

			sendAsyncRequest(req, url, null, 'GET');
		},

		onAllowDrop: function(dragRow, dropRow) {
			// allow dropping only onto other data rows with the same "context-"
			if (dropRow.className == "data") return true;
			else return false;
		}
	});
}