javascript - get result of a multiplication of two input tags into a different one

Question

I have two inputs tags. one is quantity and the other is rate.

How can I show the result of the multiplication of those directly into a different input tag straight after the user stop typing?

I'm new to development and I'm finding my way. I'd like to have an input on where to start to sort this out.

Thank you

Answer 1

Maybe this helps a little bit.... (Dirty... i know)

<input id="in1">
<input id="in2">
<input id="in3">

<script>
 var val1=0;
 var val2=0;
 var val3=0;
 $(document).ready(function(){
   $('#in1').keyup(function(){
     val1=$(this).val();
     val2=$('#in2').val();
     val3=parseInt(val1)*parseInt(val2);
     $('#in3').val(val3);
   });
   $('#in2').keyup(function(){
     val2=$(this).val();
     val1=$('#in1').val();
     val3=parseInt(val1)*parseInt(val2);
     $('#in3').val(val3);
   });
 });
</script>

NOT TESTED