source: trunk/www.guidonia.net/wp/wp-content/plugins/contact-form-7/contact-form-7.js@ 44

jQuery(document).ready(function() {
    try {
        jQuery('div.wpcf7 > form').ajaxForm({
            beforeSubmit: wpcf7BeforeSubmit,
            dataType: 'json',
            success: wpcf7ProcessJson
        });
    } catch (e) {
    }

    try {
        jQuery('div.wpcf7 > form').each(function(i, n) {
            wpcf7ToggleSubmit(jQuery(n));
        });
    } catch (e) {
    }
});

// Exclusive checkbox
function wpcf7ExclusiveCheckbox(elem) {
    jQuery(elem.form).find('input:checkbox[name="' + elem.name + '"]').not(elem).removeAttr('checked');
}

// Toggle submit button
function wpcf7ToggleSubmit(form) {
    var submit = jQuery(form).find('input:submit');
    if (! submit.length) return;

    var acceptances = jQuery(form).find('input:checkbox.wpcf7-acceptance');
    if (! acceptances.length) return;

    submit.removeAttr('disabled');
    acceptances.each(function(i, n) {
        n = jQuery(n);
        if (n.hasClass('wpcf7-invert') && n.is(':checked') || ! n.hasClass('wpcf7-invert') && ! n.is(':checked'))
        submit.attr('disabled', 'disabled');
    });
}

function wpcf7BeforeSubmit(formData, jqForm, options) {
        wpcf7ClearResponseOutput();
        jQuery('img.ajax-loader', jqForm[0]).css({ visibility: 'visible' });

    formData.push({name: '_wpcf7_is_ajax_call', value: 1});
    jQuery(jqForm[0]).append('<input type="hidden" name="_wpcf7_is_ajax_call" value="1" />');
  
        return true;
}

function wpcf7NotValidTip(into, message) {
  jQuery(into).append('<span class="wpcf7-not-valid-tip">' + message + '</span>');
        jQuery('span.wpcf7-not-valid-tip').mouseover(function() {
                jQuery(this).fadeOut('fast');
        });
        jQuery(into).find(':input').mouseover(function() {
                jQuery(into).find('.wpcf7-not-valid-tip').not(':hidden').fadeOut('fast');
        });
        jQuery(into).find(':input').focus(function() {
                jQuery(into).find('.wpcf7-not-valid-tip').not(':hidden').fadeOut('fast');
        });
}

function wpcf7ProcessJson(data) {
        var wpcf7ResponseOutput = jQuery(data.into).find('div.wpcf7-response-output');
        wpcf7ClearResponseOutput();
        if (data.invalids) {
                jQuery.each(data.invalids, function(i, n) {
                        wpcf7NotValidTip(jQuery(data.into).find(n.into), n.message);
                });
                wpcf7ResponseOutput.addClass('wpcf7-validation-errors');
        }
        if (data.captcha) {
                jQuery.each(data.captcha, function(i, n) {
                        jQuery(data.into).find(':input[name="' + i + '"]').clearFields();
                        jQuery(data.into).find('img.wpcf7-captcha-' + i).attr('src', n);
                        var match = /([0-9]+)\.(png|gif|jpeg)$/.exec(n);
                        jQuery(data.into).find('input:hidden[name="_wpcf7_captcha_challenge_' + i + '"]').attr('value', match[1]);
                });
        }
    if (data.quiz) {
        jQuery.each(data.quiz, function(i, n) {
            jQuery(data.into).find(':input[name="' + i + '"]').clearFields();
            jQuery(data.into).find(':input[name="' + i + '"]').siblings('span.wpcf7-quiz-label').text(n[0]);
            jQuery(data.into).find('input:hidden[name="_wpcf7_quiz_answer_' + i + '"]').attr('value', n[1]);
        });
    }
        if (1 == data.spam) {
                wpcf7ResponseOutput.addClass('wpcf7-spam-blocked');
        }
        if (1 == data.mailSent) {
                jQuery(data.into).find('form').resetForm().clearForm();
                wpcf7ResponseOutput.addClass('wpcf7-mail-sent-ok');

        if (data.onSentOk)
            jQuery.each(data.onSentOk, function(i, n) { eval(n) });
        } else {
                wpcf7ResponseOutput.addClass('wpcf7-mail-sent-ng');
        }
        wpcf7ResponseOutput.append(data.message).fadeIn('fast');
}

function wpcf7ClearResponseOutput() {
        jQuery('div.wpcf7-response-output').hide().empty().removeClass('wpcf7-mail-sent-ok wpcf7-mail-sent-ng wpcf7-validation-errors wpcf7-spam-blocked');
        jQuery('span.wpcf7-not-valid-tip').remove();
        jQuery('img.ajax-loader').css({ visibility: 'hidden' });
}