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{% extends "admin/change_form.html" %}
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{% block admin_change_form_document_ready %}
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<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
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<script>
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    $('#id_operations, #id_zp_rate, #id_zp_rate2').on('change', function(e) {
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        e.preventDefault()
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        zp_rate = $('#id_zp_rate').val()
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        operations = $('#id_operations').val()
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        zp_rate2 = $('#id_zp_rate2').val()
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        res = $('#id_res').val()    
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        res = $('#id_res')
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        zp_rate4 = $('#id_zp_rate4').val()
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        zp_rate4 = $('#id_zp_rate4')
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        zp_rate3 = $('#id_zp_rate3').val()
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        function one(){
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            if (operations === '-')
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                zp_rate4.val(parseFloat(res) - parseFloat(zp_rate))
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         }
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        function two(){
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            if (operations === '%')
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                res.val((parseFloat(zp_rate) * parseFloat(zp_rate2)) / 100)
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            }
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        //zp_rate4.val(parseFloat(res) - parseFloat(zp_rate2))
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        one();
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        two();
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    })
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//if dejstvie == plus  plus(perem1, perem 2 );
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</script> 
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{% endblock %}