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$('form').submit(function () {
    if ($(this).valid()) {
        $(this).find('button[type="submit"]').prop('disabled', true);
    }
});

$('form').submit(function () {
    if ($(this).valid()) {
        $(this).find('button[type="submit"]').prop('disabled', true)
                                                            .attr('style', 'background:none!important;border:none!important')
                                                            .html('<i class="fa fa-spinner fa-spin"></i>');
    }
});