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<?php
/*
Plugin Name: Add TOS/PP checkbox To BuddyPress Registration
Plugin URI: https://premium.wpmudev.org/
Description: Inserts text links and checkbox to BuddyPress regtration form to confirm acceptance of terms and privacy policy prior to registration. Submit button is disabled if check box is not selected. To install on your site, upload to wp-content/mu-plugins/
Author: James Morris @ WPMUDEV
Author URI: https://premium.wpmudev.org/
License: GPLv2 or later
*/
add_action('bp_before_registration_submit_buttons', 'bph_show_privacy_link');
function bph_show_privacy_link() {
    echo '
    <script type="text/javascript">
    jQuery( document ).ready(function($) {
        $("#signup_submit").prop("disabled", true);
        $("#tos-pp-check").on("click", function() {
            if($(this).is(":checked")){
                 $("#signup_submit").prop("disabled",false);
             } else {
                 $("#signup_submit").prop("disabled",true);
             }
         });
    });
    </script>
    <style type="text/css" media="all">
    #buddypress #signup_form.standard-form div.submit, div#terms-privacy, label#tos-pp-check {
        width:50%;
        padding:0 1em;
        float: right !important;
    }
    #buddypress #signup_form.standard-form div.submit input#signup_submit {
        padding:1em;
        background-color:lightblue;
        color:black;
    }
    #buddypress #signup_form.standard-form div.submit input#signup_submit:disabled, #buddypress #signup_form.standard-form div.submit input#signup_submit:disabled:hover {
        padding:1em;
        background-color:#ddd;
        color:#999;
    }
    #buddypress #signup_form.standard-form div.submit input#signup_submit:hover {
        padding:1em;
        background-color:green;
        color:white;
    }
    a#bp-terms-link, a#bp-privacy-link {
        border-bottom:1px dotted silver;
    }
    </style>
    <div id="terms-privacy">
    Checking "I Agree" constitutes agreement to our standard <a href="http://ss.wpdevtests.com/terms/" title="Read Our Terms of Service" target="_blank" id="bp-terms-link">Terms of Service</a> and acknowledgement of our <a href="http://ss.wpdevtests.com/privacy/" title="Read Our Privacy Policy" target="_blank" id="bp-privacy-link">Privacy Policy</a>.
    <br />
    <label for="tos-pp-check">
    <input id="tos-pp-check" type="checkbox" />
    I Agree
    </label>
    </div>
    ';
}