We will create two tables: show school subjects on the left and show schedules on the right You can drag and drop school subjects onto the schedule cell. The school subject is a < div class = "item" > element, and the schedule cell is an element, as shown in the following figure:

Show school subjects

    <div class="left">
        <table>
            <tr>
                <td><div class="item">English</div></td>
            </tr>
            <tr>
                <td><div class="item">Science</div></td>
            </tr>
            <!-- other subjects -->
        </table>
    </div>

Show schedule

<div class="right">
        <table>
            <tr>
                <td class="blank"></td>
                <td class="title">Monday</td>
                <td class="title">Tuesday</td>
                <td class="title">Wednesday</td>
                <td class="title">Thursday</td>
                <td class="title">Friday</td>
            </tr>
            <tr>
                <td class="time">08:00</td>
                <td class="drop"></td>
                <td class="drop"></td>
                <td class="drop"></td>
                <td class="drop"></td>
                <td class="drop"></td>
            </tr>
            <!-- other cells -->
        </table>
    </div>

Drag the school subject on the left

    $('.left .item').draggable({
        revert:true,
        proxy:'clone'
    });

Place school subjects on schedule cells

 $('.right td.drop').droppable({
        onDragEnter:function(){
            $(this).addClass('over');
        },
        onDragLeave:function(){
            $(this).removeClass('over');
        },
        onDrop:function(e,source){
            $(this).removeClass('over');
            if ($(source).hasClass('assigned')){
                $(this).append(source);
            } else {
                var c = $(source).clone().addClass('assigned');
                $(this).empty().append(c);
                c.draggable({
                    revert:true
                });
            }
        }
    });