JSFiddle - React, Tailwind, and code Playground

HTML

<div id="lse" class="display">
  <div id="centertbl">
    <table id="tblData" class="TSS">
      <tr>
        <td align="center" colspan="4"><b>Table 1</b></td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "1">Data 1</td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "2">Data 2</td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "3">Data 3</td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "4">Data 4</td>
      </tr>
    </table>

    <table id="tblData" class="TSS">
      <tr>
        <td align="center" colspan="4"><b>Table 2</b></td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "1">Data 1</td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "2">Data 2</td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "3">Data 3</td>
      </tr>
      <tr>
        <td align="center" colspan="4" id = "4">Data 4</td>
      </tr>
    </table>
  </div>

  <input type="submit" class="button button1" name="submitButton" value="Button 1">
  <input type="submit" class="button button1" name="submitButton" value="Button 2">
</div>

CSS

.TSS {
  border: 1px solid #000000;
  float: none;
  font-family: Verdana, Geneva, sans-serif;
  font-size: 10.6px;
  font-style: normal;
  padding: 10px;
  text-decoration: none;
  display: inline-block;
}

#centertbl {
  text-align: center;
}

.button {
  background-color: #4CAF50;
  /* Green */
  border: none;
  color: white;
  padding: 5px 15px;
  text-align: center;
  text-decoration: none;
  display: block;
  font-size: 16px;
  margin: 4px 2px;
  -webkit-transition-duration: 0.4s;
  /* Safari */
  transition-duration: 0.4s;
  cursor: pointer;
}

.button1 {
  background-color: white;
  color: black;
  border: 2px solid #4CAF50;
}

.button1:hover {
  background-color: #4CAF50;
  color: white;
}

td.selected{
  background:red;
  color:white;
}

JavaScript

$('td').on('click', function(){
	$('td').removeClass('selected');
  $(this).addClass('selected');
});

$('.button').on('click', function(){
	var selectedId = $('td.selected').attr('id');
  alert(selectedId);
});