How to make a Submit that Zera an accountant

Question

I don’t understand javascript and I don’t know how to search to make a button that when pressed zeroes my counter that is a global variable

<form id="btn" method="get">
<input type="submit" name="submit" value="zerar"onclick="submit();">
</form>
<script>
    function ssubmit(){
         document.getElementById("btn".submit());
    }
</script>

then he calls another function that resets the variable "in" where I put to call the other function?

Answer 1

Do you really need the button to be a Submit? Because you can control the click on any element for that. Anyway, it follows.

<form id="btn" method="get">
  <input type="submit" name="submit" value="zerar" onclick="ssubmit();">
</form>
<script>
    function ssubmit(){
         num = 0; //assumindo que seja num a variável global zerada
         document.getElementById("btn".submit()); //procede o submit normal do formulário (isso vai recarregar a página, daí perde o sentido o código).
    }
</script>

Already in case you want instead of submit, happen only the function call, you can do:

<button onclick="ssubmit();">Zerar</button>
<script>
    function ssubmit(){
        num = 0; //de novo, assumindo que num seja a variável global
        outraFuncao(); // chama uma outra função para fazer seja lá o que você quiser fazer
    }
</script>

If I haven’t answered your question, explain better what you need.