Question

I’m using the jQuery calculation plugin here: http://www.pengoworks.com/workshop/jquery/calculation/calculation.plugin.htm

Here is a jsFiddle: http://jsfiddle.net/k3edG/4/

As you can see, I have multiple radio buttons. Alongside the radio buttons, right now – I have spans that sum up all the nutrition data in the totals area.

What I want to do is have the totals of each nutrition item only be calculated when the user selects the related radio button.

I thought about doing onclick events for each individual radio button but I haven’t been able to get anywhere yet.

Any thoughts?

$(document).ready(function() {



// get the sum of the elements
var calories = $(".caloriesSum").sum();
var fat = $(".fatSum").sum();
var satfat = $(".satfatSum").sum();
var carbs = $(".carbsSum").sum();
var protein = $(".proteinSum").sum();
var sodium = $(".sodiumSum").sum();
var chloresterol = $(".chloesterolSum").sum();

// update the total
$("#totalCalories").text(+ calories.toString());
$("#totalFat").text(+ fat.toString());
$("#totalSatFat").text(+ satfat.toString());    
$("#totalCarbs").text(+ carbs.toString());
$("#totalProtein").text(+ protein.toString());
$("#totalSodium").text(+ sodium.toString());
$("#totalChloresterol").text(+ chloresterol.toString());


}); 


<h4>Pick Your Meal</h4>

        <ul class="options">
            <li>
                <input type="radio" id="wwheatt" name="meal" value="whole_wheat_tortilla"> Whole Wheat Tortilla
                <span class="caloriesSum">280</span>
                <span class="fatSum">6</span>
                <span class="satfatSum">0</span>
                <span class="carbsSum">44</span>
                <span class="proteinSum">8</span>
                <span class="sodiumSum">340</span>
                <span class="chloesterolSum">0</span>
            </li>
            <li>
                <input type="radio" name="meal" value="flour_tortilla"> Flour Tortilla
                <span class="caloriesSum">290</span>
                <span class="fatSum">6</span>
                <span class="satfatSum">2</span>
                <span class="carbsSum">49</span>
                <span class="proteinSum">9</span>
                <span class="sodiumSum">770</span>
                <span class="chloesterolSum">0</span>
            </li>
            <li>
                <input type="radio" name="meal" value="naked"> Naked, zero nutrients
                <span class="caloriesSum">0</span>
                <span class="fatSum">0</span>
                <span class="satfatSum">0</span>
                <span class="carbsSum">0</span>
                <span class="proteinSum">0</span>
                <span class="sodiumSum">0</span>
                <span class="chloesterolSum">0</span>
            </li>
        </ul>

        <h4>Select Your Protein</h4>

        <ul class="options">
            <li>
                <input type="radio" name="protein" value="steak"> Steak
                <span class="caloriesSum">230</span>
                <span class="fatSum">9</span>
                <span class="satfatSum">3</span>
                <span class="carbsSum">3</span>
                <span class="proteinSum">32</span>
                <span class="sodiumSum">170</span>
                <span class="chloesterolSum">90</span>
            </li>
            <li>
                <input type="radio" name="protein" value="carnitas"> Carnitas
                <span class="caloriesSum">210</span>
                <span class="fatSum">9</span>
                <span class="satfatSum">3</span>
                <span class="carbsSum">2</span>
                <span class="proteinSum">29</span>
                <span class="sodiumSum">490</span>
                <span class="chloesterolSum">90</span>
            </li>
            <li>
                <input type="radio" name="protein" value="chicken"> Chicken
                <span class="caloriesSum">190</span>
                <span class="fatSum">2</span>
                <span class="satfatSum">0</span>
                <span class="carbsSum">4</span>
                <span class="proteinSum">35</span>
                <span class="sodiumSum">560</span>
                <span class="chloesterolSum">90</span>
            </li>
            <li>
                <input type="radio" name="protein" value="tofu"> Tofu
            </li>
        </ul>

Answer 1

Very basic; but is this the sort of thing you are after? http://jsfiddle.net/k3edG/3/

What I’ve done is add an active class to the <li /> which has a selected option.
Then I’ve modified your original update function to only add the values of active items.

I assumed that you would have nutritional information for the checkbox items as well as the radios

Hope that helps 😀