jquery - Rails 3: How to sum multiple collection selections? -

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i have select box collection called "size", values of 10, 25, 50, etc. can add/remove field using jquery that, example, there 3 different size selections on page: 25, 50, , 10. if want sum these values on page, , total of 85, how can accomplish this?

audience.rb

size = ['5', '10', '25', '50', '75', '100']

form.html.erb

<%= f.fields_for :audiences |audience_form| %>   <div class="audiencefields">   <span class="audienceforminsert"></span>     <div>     <%= audience_form.label :number_of_people, "size" %><br />     <%= audience_form.collection_select :number_of_people, audience::size, :to_s, :to_s, :include_blank => true %>   </div>    </div>    <%= audience_form.link_to_remove "remove audience", :id => "removelink" %>   <% end %>    <p><%= f.link_to_add "add audience", :audiences, :id => "addlink" %></p>

application.js

$("#removelink").hide().filter(":first-child").show();  $('form a.add_nested_fields, form a.remove_nested_fields').live('click', function(){ $("div.audiencefields span.audienceforminsert").each(function(index, element) {     //index starts 0     $(this).text("audience");}); });  $("span.audienceshowinsert").each(function(index, element) {     //index starts 0     $(this).text("audience " + (index + 1)); });

find of select boxes , add selected value:

var combined = 0; $("select").each(function() {     combined += parseint($(this).val()); });

here example jsfiddle.


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