Counting a check_box selections?

Rails
1

Hello to everybody!

I have the following code in new.html.erb allowing a user to
select more questions (item) for creating a questionnaire:

…
<% for item in @itemss %>
<%= check_box_tag “questionnaire[item_ids][]”, item.id,
@questionnaire.items.include?(item) %>
<%= item.kind %> <%= item.question %>
- “<%= item.denomination %>” - p.ti <%= item.score %>

<% end %>
…

I would like to show, while the user is making his choices, the
calculation of:

  • the number of selected items
  • the sum of the scores (each item has its own score)

any suggestions?

2

use jquery and bind click event to some calculcation function. you can
set some value or metadata to count with

eg

= check_box_tag ‘name’, value, checked?, :‘data-count’ => 123, :class =>
‘sums’

and you jquery

var result; // global variable

jQuery(‘.sums’).each(function() {
jQuery(this).bind(‘click’, function() {
result+= parseInt(jQuery(this).attr(‘data-count’)) *
(jQuery(this).attr(‘checked’)) ? 1 : -1;
});
});

in data-count you can have the value you want to inc/dec from final
result
when user clicks, jquery will evaluate checked state, when checked,
it’ll increase the result, when unchecked, it’ll decrease

tom

On Jul 24, 2011, at 20:15 , mr ma wrote:

     - "<%=  item.denomination %>" - p.ti <%= item.score %> <br/>

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Tomas Meinlschmidt, MS {MCT, MCP+I, MCSE, AER}, NetApp Filer/NetCache

www.meinlschmidt.com www.maxwellrender.cz www.lightgems.cz

3

Thank you very much Tomas!!!
I have not yet used jquery, I will study it a little bit…
Marco

4

Hi Tomas,

I studied a little Javascript and I write this script but
the variable ‘result’ is undefined, can you help me? :wink:

=> new.html.erb
…

<% @itemss.each do |item| %> <%= check_box_tag "questionnaire[item_ids][]", item.id, @questionnaire.items.include?(item), :'data-count' => item.score, :class => 'sums', :onClick => "calculate();" %> <%= item.kind %> <%= item.question %> - "<%= item.denomination %>" - p.ti <%= item.score %>
<% end %>

...

=> application.html.erb
…