How to make a converter?

Ask the community
,
1

I was working on a project, and I wanted to add a convertor. There are to boxes, one of which you can input data into. You type a number into the first box, and a number pops up in the second box (at a rate of 0.0046). If the input is not a number, or below 1, the output should give an error message. I always wanted to make my own calculators, customizable to my wants.

2

Set an onInput or onChange event listener,
You can restrict it in advance to numbers only.
But you can also check for isNun
Something like:

//call this function from the event handler
function checkInput (v){
  if (isNaN(v)) {
    return "Not a Number";
  }
const num = Number(v);
if(num < 1){return "smaller then 1";}
  return v;
}

And then assign the results to the second box.