JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https:////netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
<script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
<form name='form1' method='post' autocomplete='on'>


<table id='tblselect' class=normal2 style='font-size:0.6em;'>
<tr><th align='right'>Shipment Type: </th>
<td><select name='shiptype' id="shiptype" onchange="">
        <option value="0"> Please select... </option>
        <option value="1"> LOCAL </option>
        <option value="2"> IMPORT </option>
      </select></td></tr>
</table>    
<br>



<table id="t1" class=normal2 style='font-size:0.6em;display:none;'>

<tr><th align='right'>Shipment Type:</th>
<td><b><input type='text' name='ship' value='LOCAL' readonly /></b></td></tr>

<tr><th align='right'>Reference Number: </th>
<td><b><input type='text' name='ref_no' value="<?php echo $localrefnumb ?>" readonly /></b></td></tr>

<tr><th align='right'>Supplier: </th>
<td><select name='supplier'>
    <option value='&nbsp;'> Please select... </option>
    <option value='Supplier 1'> Supplier 1 </option>
    <option value='Supplier 2'> Supplier 2 </option>
    <option value='Supplier 3'> Supplier 3 </option>
      </select></td></tr>

<tr><th align='right'>Description: </th>
<td><input type='text' name='description' size='70' /></td></tr>

<tr><th align='right'>PO No: </th>
<td><input type='date' name='po_no' /></td></tr>

<tr><th align='right'>Invoice Number: </th>
<td><input type='text' name='inv_number' /></td></tr>

<tr><th align='right'>Receive Qty: </th>
<td><input type='text' name='r_qty'/></td></tr>

<tr><th align='right'>No. of Boxes/Packs: </th>
<td><input type='text' name='no_boxes'/></td>

<tr><th align='right'> </th>
<td></td></tr>

<tr><th align='right'> </th>
<td align='left'><input type='submit' name='local_btn' value='SAVE' style='font-size:2em;'> &nbsp;&nbsp;&nbsp;&nbsp; <input type='submit' name='local_cancel' value='CANCEL'...

JavaScript

$(document).ready(function(){
 $('#shiptype').change(function () {
   $('#t1,#t2').hide();
      var tableValue = $(this).val();

    if (tableValue == 1) {
        $('#t1').show();
    } else if (tableValue == 2) {
        $('#t2').show();
    }   

}); });