Return from variable in javascript = undefined

Question

Return from variable in javascript = undefined

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#1 by (3 votes)

2

Here is the code:

    <script type="text/javascript">
    function Enviar(){
    var tempo = document.getElementById('tempo');
    var veloc = document.getElementById('veloc');

    var distancia = parseInt(tempo) * parseInt(veloc);
    var litros = parseInt(distancia) / 12;

    alert("Tempo gasto de viagem:"+tempo.value+"\nVelocidade média:"+veloc.value+
          "\nDistância percorrida:"+distancia.value+"\nLitros gastos:"+litros.value);
    }
    </script>
</body>

But in the result it says that the distance and liter variables are "undefined" and should contain the results of multiplication and division.

javascript

asked by anonymous 08.10.2015 / 02:32

1 answer

How to convert numbers 2.15600e + 03 (euler) to numeric type? The program jumps a line of code forward

score 3 · Accepted Answer

The variables tempo and veloc are elements, not values. So it should be:

var distancia = parseInt(tempo.value) * parseInt(veloc.value);

Already distancia and litros are values, not elements. So it makes no sense to try to get value from them. The alert should be:

alert("Tempo gasto de viagem:"+tempo.value+"\nVelocidade média:"+veloc.value+
      "\nDistância percorrida:"+distancia+"\nLitros gastos:"+litros);