Function select

plugins/MultiDrag/MultiDrag.js:532–541

* Selects the provided multi-drag item * @param {HTMLElement} el The element to be selected

(el)

			 * @param  {HTMLElement} el    The element to be selected
			 */
			select(el) {
				let sortable = el.parentNode[expando];
				if (!sortable || !sortable.options.multiDrag || ~multiDragElements.indexOf(el)) return;
				if (multiDragSortable && multiDragSortable !== sortable) {
					multiDragSortable.multiDrag._deselectMultiDrag();
					multiDragSortable = sortable;
				}
				toggleClass(el, sortable.options.selectedClass, true);
				multiDragElements.push(el);
			},
			/**
			 * Deselects the provided multi-drag item
			 * @param  {HTMLElement} el    The element to be deselected