javascript - Need help in java script code -

            function addnumbers()             {                     var val1 = parseint(document.getelementbyid("value1").value);                     var val2 = parseint(document.getelementbyid("value2").value);                     var ansd = document.getelementbyid("answer");                     ansd.value = val1 + val2;             } 

i want show output without click on button please me out.

you can use onchange, trigger function, once input blurred. or can use onkeyup, triggered type.

function addnumbers() {    var val1 = parseint(document.getelementbyid("value1").value);    var val2 = parseint(document.getelementbyid("value2").value);    var ansd = document.getelementbyid("answer");    ansd.value = val1 + val2;  }  window.onload = function() {   addnumbers();  };

<input id="value1" onkeyup='addnumbers()' value="10"/>  <input id="value2" onkeyup='addnumbers()' value="20"/>  <input id="answer" />

edit:

you can check if value in input exists using conditions(if needed) if don't want display nan when 1 value empty.