JSFiddle - React, Tailwind, and code Playground

HTML

<div class="form-group">
									<label for="txtusername" class="col-sm-4 control-label">Username</label>
									<div class="col-sm-8">
										<input type="text" class="form-control" id="txtusername" name="txtusername" placeholder="Username" value="">
									</div>
								</div>
								<div class="form-group">
									<label for="txtpassword" class="col-sm-4 control-label">Password</label>
									<div class="col-sm-8">
										<input  type="password" class="form-control" id="txtpassword" name="txtpassword" placeholder="Password" value="">
									</div>
								</div>
								<div class="form-group">
									<div class="col-sm-offset-4 col-sm-8">
										<div class="checkbox">
											<label><input type="checkbox">Remember me</label>
										</div>
									</div>
								</div>
								<div class="form-group">
									<div class="col-sm-offset-4 col-sm-8">
										<button type="submit" id="signin" class="btn btn-default"  >Sign in</button>

									</div>

JavaScript

$(document).ready(function() {
    checkLoginStats(); $("#txtusername").attr("onkeyup","checkLoginStats();");  $("#txtpassword").attr("onkeyup","checkLoginStats();");
});

function checkLoginStats()
{
    var userName   = $("#txtusername").val();
    var userPass   = $("#txtpassword").val();
    var buttonStat = true;
    if(userName!="" && userPass!="")
    {
        buttonStat = false;
    }
    $("#signin").attr("disabled",buttonStat);
}