I'm trying to create a calculator with inputs, but it works wrong, why?

Question

I'm trying to create a calculator with HTML inputs, but it not working, when I'm push on "Calculate" it's show me right answer and immediately refreshing page, but I'm don't want to refresh this is my code, why it not working? document.getElementById("calc").onclick = function() {myFunction()};

function myFunction() {
 if (isNaN(document.getElementById("num1").value) || isNaN(document.getElementById("num2").value)) {
   document.getElementById("value").innerHTML = "Please enter number!";

 }
else {
  switch (document.getElementById("opr").value) {
    case "+": 
      document.getElementById("value").innerHTML = parseInt(document.getElementById("num1").value) +      parseInt(document.getElementById("num2").value) ;
      break;
    case "-": document.getElementById("value").innerHTML = parseInt(document.getElementById("num1").value) -   parseInt(document.getElementById("num2").value) ;
      break;
    case "*": document.getElementById("value").innerHTML = parseInt(document.getElementById("num1").value) * parseInt(document.getElementById("num2").value) ;
      break;
    case "/": document.getElementById("value").innerHTML = parseInt(document.getElementById("num1").value) / parseInt(document.getElementById("num2").value) ;
      break;
    default: document.getElementById("value").innerHTML = "Something went wrong, please try again";
      break;
  } 
  }  
  }

Possible duplicate of http://stackoverflow.com/questions/19454310/stop-form-refreshing-page-on-submit — Jeremy Thille, Aug 15 '16 at 15:57
can you show the code from where you are taking the input? it is possible that you have a form, and because of that it is refreshing. — Ravi Shankar Bharti, Aug 15 '16 at 15:58
thanks very much, the problem was form, but without form i can't reset, therefor i put "Value" out of — Y. Vahe, Aug 16 '16 at 07:50

I'm trying to create a calculator with inputs, but it works wrong, why?

0 Answers0