Harvard Extension School
CSCI E-12 Fundamentals of Web Site Development | Fall 2019

## Ice Cream

Start with everything visible, then hide with JavaScript:
Key piece here is: `$("#icecream_options").hide();`

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

- Markup
- Style
- Script
- Screenshot

    <form method="get" name="ice_cream" id="ice_cream" action="http://cscie12.dce.harvard.edu/echo">
    <div>Would you like ice cream?<br/>
    <input type="radio" name="want" id="ic_yes" value="yes"/><label for="ic_yes">Yes</label><br/>
    <input type="radio" name="want" id="ic_no" value="no"/><label for="ic_no">No</label></div><fieldset id="icecream_options"><legend>Ice Cream Options</legend><p>How would you like it?</p>

    <input type="radio" id="container_cup" name="container" value="cup"/><label for="container_cup">Cup</label><br/>
    <input type="radio" id="container_cone" name="container" value="cone"/><label for="container_cone">Cone</label><br/><p>Pick your toppings:</p>

    <input type="checkbox" name="toppings" id="toppings_wc" value="whipcream"/><label for="toppings_wc">Whipped cream</label><br/>
    <input type="checkbox" name="toppings" id="toppings_j" value="jimmies"/><label for="toppings_j">Jimmies</label><br/>
    <input type="checkbox" name="toppings" id="toppings_nuts" value="nuts"/><label for="toppings_nuts">Nuts</label><br/>
    <input type="checkbox" name="toppings" id="toppings_cherry" value="cherry"/><label for="toppings_cherry">Cherry</label></fieldset><p>
    <input type="submit"/></p>

    </form>

In `style` element (`<style type="text/css">`) within `head` element:

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

In `script` element within `head` element (`<script type="text/javascript">`):

    $(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');
        }
    }

What's the difference between sprinkles and jimmies?

Copyright © David Heitmeyer