## Ice Cream

- Use JavaScript to add the "onclick" listener
- Use JavaScript to hide the `div` containing the additional options.

Let's see how we can do this with jQuery. Items to note:

- Separation. The "click" handler is bound via JavaScript and not the onclick attribute.
- Fancier. jQuery provides many "effects" and "animations" (basic ones here are `fadeOut` and `fadeIn`)

Example 9.3 - Separation from Markup - Example 9.3 (Without Styles) | Example 9.3 JSFiddle

- Markup
- Style
- Script
- Screenshot

     <form method="get" name="ice_cream" id="ice_cream" action="https://cscie12.dce.harvard.edu/echo">
       <div>Would you like ice cream?
         <br/>

         <label>
           <input type="radio" name="want" id="ic_yes" value="yes"/>
    Yes     </label>
         <label>
           <input type="radio" name="want" id="ic_no" value="no"/>
    No     </label>
       </div>
       <fieldset id="icecream_options">
         <legend>Ice Cream Options     </legend>
         <p>How would you like it?
         </p>
         <label>
           <input type="radio" id="container_cup" name="container" value="cup"/>
    Cup     </label>
         <br/>

         <label>
           <input type="radio" id="container_cone" name="container" value="cone"/>
    Cone     </label>
         <br/>

         <p>Pick your toppings:
         </p>
         <label>
           <input type="checkbox" name="toppings" id="toppings_wc" value="whipcream"/>
    Whipped cream     </label>
         <br/>

         <label>
           <input type="checkbox" name="toppings" id="toppings_j" value="jimmies"/>
    Jimmies     </label>
         <br/>

         <label>
           <input type="checkbox" name="toppings" id="toppings_nuts" value="nuts"/>
    Nuts     </label>
         <br/>

         <label>
           <input type="checkbox" name="toppings" id="toppings_cherry" value="cherry"/>
    Cherry     </label>   </fieldset>
       <p>
         <input type="submit"/>

       </p>
     </form>

In `style` element (`<style>`) within `head` element:

    #icecream_options {
        background-color: #eee;
        margin-left: 2em;
    }
    label { display: block; }

In `script` element within `head` element (`<script>`):

    $(document).ready(
      function(){
        $("#icecream_options").hide();
        $("input[name='want']").click(
          function(){
            displayIceCreamOptions();
          }
        );
      }
    );

    function displayIceCreamOptions() {
        if ($("input[name='want']:checked").val() == 'yes') {
          $('#icecream_options').fadeIn('slow');
        } else {
          $('#icecream_options').fadeOut('slow');
        }
    }