How can I validate google reCAPTCHA v2 using javascript/jQuery?
I have a simple contact form in aspx. I want to validate the reCaptcha (client-side) before submitting the form. Please help.
Sample code:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Test Form</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script src="https://www.google.com/recaptcha/api.js" async defer></script>
<script>
$("#cmdSubmit").click(function () {
//need to validate the captcha
});
</script>
</head>
<body>
<form id="form1" runat="server">
<label class="clsLabe">First Name<sup>*</sup></label><br />
<input type="text" id="txtFName" name="txtFName" class="clsInput" /><br />
<div class="g-recaptcha" data-sitekey="my_key"></div>
<img id="cmdSubmit" src="SubmitBtn.png" alt="Submit Form" style="cursor:pointer;" />
</form>
</body>
</html>
I want to validate the captcha on cmdSubmit click.
Please help.
Answer
This Client side verification of reCaptcha - the following worked for me :
if reCaptcha is not validated on client side grecaptcha.getResponse(); returns null, else is returns a value other than null.
Javascript Code:
var response = grecaptcha.getResponse();
if(response.length == 0)
//reCaptcha not verified
else
//reCaptch verified