This script pulls parameters, if any, from the query string, and automatically submits the Infusionsoft web form

auto-submit-is-form.js

<script>
    $ = jQuery;
    $(document).ready(function() {
        var query, param, arg;
        $('html').css('display', 'none');
        if (query = window.top.location.href.split('?')[1]) {
            $.each(query.split('&'), function (idx, val) {
                param = val.split('=')[0];
                arg   = val.split('=')[1];
                if ( ! $('#' + param).length) {
                    return;
                }
                $('#' + param).val(arg);
            });
        }
        $('.infusion-form').first().submit();
    });
</script>