anchor.diff:                label(for='order_value') Order Value
                 .input-append
                   input#order_value(
  -                  name='value'
  +                  name='value', type='text'
                     ng-model='order.second', ng-change='calc_first()'
                     rp-positive-amount, required)
                   .add-on {{order.second_currency}}
  
positive.code:               label(for='order_price') Price of Each
                .input-append
                  input#order_price(
                    name='price'
                    ng-model='order.price', ng-change='calc_second()'
                    rp-positive-amount, required)
                  .add-on {{order.second_currency}}
  
negative.code:               label(for='order_amount', ng-show="order.type == 'buy'") Amount To Buy
                .input-append
                  input#order_amount(
                    name='amount', type='text'
                    ng-model='order.first', ng-change='calc_second()'
                    rp-positive-amount, required)
                  .add-on {{order.first_currency}}
  