JSFiddle - React, Tailwind, and code Playground

by Arindam Nayak

HTML

<input type="text" id="txt1" />
<input type="button" value="submit" onclick="incrvalue()" />

JavaScript

function incrvalue()
{
    var ibox = document.getElementById("txt1"); 
    if(isNaN(ibox.value)) return; // if input is not a number
   var  k = parseInt(ibox.value);
    k = k + 1;
    ibox.value = k;
}