JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="school" name="school"/>

JavaScript

$("#school").bind('keypress', function (event) {
          var flag=0;
            if (event.keyCode === 13 || event.keyCode === 8)
{
var flag=1;
    return true;
}

console.log(flag);
            var regex = new RegExp("^[a-zA-Z0-9]+$");
            var key = String.fromCharCode(!event.charCode ? event.which : event.charCode);
            console.log(key);
            if (!regex.test(key)) {
              console.log("if");

              //jQuery("#errmsg").html(localStorage.getItem("datas")).show();

              event.preventDefault();
              return false;
            }
            else
            {
              console.log("else");
            }
            //alert(data);



          });