JSFiddle - React, Tailwind, and code Playground

by Ron Eaglin

HTML

<input type="textbox" value="A" id = "input" />
<input type="button" value="Add Node" onclick="AddNode();" />

JavaScript

function AddNode() {
   var content = document.getElementById("input").value;
   var next_content = String.fromCharCode(content.charCodeAt(0) + 1);
   document.getElementById("input").value = next_content;
}