How can I validate google reCAPTCHA v2 using javascript/jQuery?

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Mahatma Aladdin via StackOverflow

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Jan 12, 2015, 8:00:00 AM1/12/15

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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>
        <script src="https://www.google.com/recaptcha/api.js" async defer></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.

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