foodsoft/app/views/shared/_article_fields_price.html....

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.fold-line
= f.input :price do
.input-prepend
%span.add-on= t 'number.currency.format.unit'
= f.input_field :price, class: 'input-mini'
= f.input :tax do
.input-append
= f.input_field :tax, class: 'input-mini'
%span.add-on %
.fold-line
= f.input :deposit do
.input-prepend
%span.add-on= t 'number.currency.format.unit'
= f.input_field :deposit, class: 'input-mini'
.control-group
%label.control-label{for: 'article_fc_price'}
= Article.human_attribute_name(:fc_price)
.controls.control-text#article_fc_price
= number_to_currency(f.object.fc_price) rescue nil
-# do this inline, since it's being used in ajax forms only
- field = f.object.class.model_name.to_s.underscore
:javascript
var form = $('#article_fc_price').closest('form');
$('##{field}_price, ##{field}_tax, ##{field}_deposit', form).on('change keyup', function() {
var price = parseFloat($('##{field}_price', form).val());
var tax = parseFloat($('##{field}_tax', form).val());
var deposit = parseFloat($('##{field}_deposit', form).val());
// Article#gross_price and Article#fc_price
var gross_price = (price + deposit) * (tax / 100 + 1);
var fc_price = gross_price * (#{FoodsoftConfig[:price_markup].to_f} / 100 + 1);
$('#article_fc_price').html($.isNumeric(fc_price) ? I18n.l("currency", fc_price) : '…');
});