JSFiddle - React, Tailwind, and code Playground

by Barney Carroll

HTML

<FORM action="http://somesite.com/prog/adduser" method="post">
    <P>
    <LABEL for="firstname">First name: </LABEL>
        <INPUT type="text" id="firstname" /><BR/>

    </P>
 </FORM>

JavaScript

document.getElementById("firstname").onkeydown = function myFunction(e){
    var keyCode = (window.event) ? e.which : e.keyCode;
    if (keyCode == 65){
        this.value ="ض";
        return false;
    }
}