22 lines
606 B
CoffeeScript
22 lines
606 B
CoffeeScript
window.price_sum_field_calculator = (count_fields_sel='.count.field', sum_field_sel='#sum_field') ->
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fields = document.querySelectorAll count_fields_sel
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sum_field = document.querySelector sum_field_sel
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change_f = (e) ->
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sum = 0
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for el in fields
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price = el.getAttribute 'data-price'
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sf = el.getAttribute 'for'
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s = 1 * el.value * price
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sfe = document.querySelector "##{sf}"
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sfe.textContent = (if 0==s then '' else s) if sfe
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sum += s
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sum_field.textContent = sum
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for el in fields
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el.addEventListener 'change', change_f
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el.addEventListener 'input', change_f
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change_f()
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