Radio Button Click

HTML

<form>
    <fieldset>
        <legend>Group 1</legend>
    <input type="radio" name="OptionGroupOne" value="1">First Option</input>
    <br />
    <input type="radio" name="OptionGroupOne" value="2">Second Option</input>
    <br />
    <input type="radio" name="OptionGroupOne" value="3">Second Option</input>
    <br />
    <input type="radio" name="OptionGroupOne" value="4">Second Option</input>
    </fieldset>
    <fieldset>
        <legend>Group 2</legend>
     <input type="radio" name="OptionGroupTwo" value="1">First Option</input>
    <br />
    <input type="radio" name="OptionGroupTwo" value="2">Second Option</input>   
    </fieldset>
   
</form>
<br />
<div class="output"> 
    <textarea name="$txtSRClosingNote" rows="8" cols="20" id="txtSRClosingNote" disabled=""></textarea>
</div>

JavaScript

//On document ready
$(function() {
    $("input[type='radio']").on('click', function(e) {       
      
       if ($(this).val() == 2 || $(this).val() == 4)
       {
       document.getElementById("txtSRClosingNote").disabled = false;
       } else{
       document.getElementById("txtSRClosingNote").disabled = true;
       
       }   
           
    });
});