JSFiddle - React, Tailwind, and code Playground

by Prasad Gavande

HTML

<input type="text" id="txtGradeNumber" />
<input type="button" id="btn" />

JavaScript

$(document).ready(function(){ 
var regularFieldValidation = function (elementValue, elementId, errorMessage, regExp) {
      if (!regExp.test(elementValue)) {
          alert("in if of reg expression test");
          $(elementId).css("border-color", "red");
          $(elementId).attr("data-original-title", errorMessage);
          $(elementId).tooltip('show');
          return false;
      }

  }
$("#btn").on("click",function(){
  var a = /^\d*$/;
  var checkRegExpValidation = regularFieldValidation(gradeNumber, "#txtGradeNumber", "Please Enter Number only", a);
});
});