JSFiddle - React, Tailwind, and code Playground

HTML

<select name="Type[]" onchange='Pack(this);' required>
<option value="Orange">Orange</option> 
<option value="Apple">Apple</option>    
<option value="others">Others</option>                          
<input type="text" name="othermethod[]" id="otherpack" style="display:none"/>
</select>

<select name="Type[]" onchange='Pack(this);' required>
<option value="Orange">Orange</option> 
<option value="Apple">Apple</option>    
<option value="others">Others</option>                          
<input type="text" name="othermethod[]" id="otherpack" style="display:none"/>
</select>

<select name="Type[]" onchange='Pack(this);' required>
<option value="Orange">Orange</option> 
<option value="Apple">Apple</option>    
<option value="others">Others</option>                          
<input type="text" name="othermethod[]" id="otherpack" style="display:none"/>
</select>

JavaScript

function Pack(v) {
	var inputBox=v.nextSibling;
  var selectedValue=v.options[v.selectedIndex].value;
  if (selectedValue=="others") {
  	inputBox.style.display='block';
  } else {
  	inputBox.style.display='none';
  }
}