title: How do I get a value where a drag-able element dropped?
body: <p>I'm now developing a website that can drag elements and drop into a table cells (each cell has its "ID")</p>
  
  <p>Now I can drag and drop the element to the cells but I want to know </p>
  
  <ul>
  <li>How to get the ID of table cell where I dropped the element?</li>
  </ul>
  
  <p>here's the picture's concept.</p>
  
  <p><img src="https://i.stack.imgur.com/TwuuO.jpg" alt="enter image description here"></p>
  
  <p>Suppose that cell's ID are the combination of row and column number.</p>