//HTML
<div class="form-group has-feedback col-xs-8 " style="padding-right:0px">
<input type="tel" class="form-control" name="Otp_MobileNo" id="mobileNo" placeholder="Mobile No." minlength="10" maxlength="10">
<span id="mobileno_message" style="display:none;color: red;">Please enter a valid Mobile No</span>
</div>
//Java Script
$("#getOtp").click(function(){
jQuery(document).ready(function(){
var MobileNo = jQuery("#mobileNo").val();
var MobileNoLength = MobileNo.length;
var zipRegex = /^\d{10}$/;
var mobileNo = $("#mobileNo").val();
if (!zipRegex.test(MobileNo))
{
jQuery('#mobileno_message').show();
}
else
{
// success!
jQuery('#mobileno_message').hide();
$.ajax({
type : 'POST',
url : '<?php echo site_url('Login/send_otp'); ?>',
data : {Otp_MobileNo:mobileNo,},
dataType : 'json',
beforeSend: function()
{
$("#error").fadeOut();
},
success : function(response)
{
alert(response.message_text);
$("#check-otp").delay().animate({
height: 'toggle',
},
"slow");
$("#getOtp").hide();
}
});
}
});
});