Changelog

4.8.6 – Jun 24, 2021

• Add nonce field to button for dismissing notice asking for plugin review.
• Add strings from config/ directory to POT file.
• Add nonce check to AJAX endpoint for refreshing cached Mailchimp lists.
• Add capability check to AJAX endpoint for retrieving list details.
• Schedule event to refresh cached Mailchimp list upon plugin activation.

Thanks to the team over at pluginvulnerabilities.com for bringing some of these changes to our attention.

4.8.5 – Jun 1, 2021

Add nonce verification to all URL’s using _mc4wp_action query parameter.
This fixes a CSRF vulnerability where a malicious website could trick a logged-in admin user in performing unwanted actions.

A special thanks to Erwan from WPScan for bringing this issue to our attention.

4.8.4 – May 7, 2021

• Add defer attribute to JS file, so page parsing isn’t blocked at all.
• Rewrite plugin CSS to optimize for selector performance and get rid of some duplication.

After installing this update, make sure to also update any add-on plugins like Mailchimp for WordPress Premium and Mailchimp Top Bar.

4.8.3 – Jan 21, 2021

• Fix fatal error on older PHP versions when submitting form without any subscriber tags set in the form settings.
• Minor performance improvement in bootstrap method of the plugin.

4.8.2 – Jan 20, 2021

• Allow short-circuiting mc4wp_subscriber_data filter by returning null or false.
• Use a subdirectory for the default debug log file location, so that it’s easier to protect using htaccess.
• Improved reliability for fetching lists from mailchimp when lists have high stats.member_count property.

4.8.1 – Aug 25, 2020

• Fix notice by explicitly setting permission_callback on registered REST route.
• Minor internal code improvements.

4.8 – Jul 9, 2020

• Plugin now requires PHP 5.3 or higher.
• Prefix overlay classname to prevent styling collissions with other plugins.
• Form sign-ups can now add tags to both new and existing subscribers.
• Update JavaScript dependencies.
• Register script early to work with Gutenberg preview.

4.7.8 – Jun 04, 2020

• Add MC4WP_API_V3::add_template method.
• Minor code hardening to ensure a default form is always set.
• Update JS dependencies to their latest versions.
• Fix icon for Gutenberg block.

4.7.7 – Apr 28, 2020

• Update JS dependencies to their latest versions.
• API client add_list_member method now has an additional parameter to skip merge field validation.
• Simplify code for updating an existing form.

4.7.6 – Apr 9, 2020

• Update JS dependencies to their latest versions.
• Check if className is of type string, fixes a console warning when clicking inside a SVG element.
• Minor improvements to the AMP implementation to address harmless validation warnings.

4.7.5 – Feb 10, 2020

• Add AMP compatibility to sign-up forms, thanks to Claudiu Lodromanean. This uses the official AMP plugin for WordPress.
• Add settings key to WPML config so settings can easily by copied over to translated versions of a form.
• Optimize size & performance of JavaScript code, resulting in a file that is 40% smaller.
• Update CodeMirror to its latest version.
• Escape all string translations.

4.7.4 – Dec 7, 2019

Fixes

• htaccess config for servers running Apache 2.4 or later.

4.7.3 – Dec 4, 2019

Fixes

• Top Bar & User Sync add-on using API v2 since version 4.7.1.
• Revert change in formatter for date fields, breaking all forms with date fields in them.

Improvements

• Add getter method for raw (unmodified) data on form class.

4.7.2 – Nov 27, 2019

Fixes

• Invalid .htaccess file in case there already is one in the uploads directory.

4.7.1 – Nov 26, 2019

Improvements

• Update MemberPress hook names. Thanks Ian Heggaton!
• Use WordPress.org translations instead of bundling translation files in plugin itself.
• Write .htaccess to directory of debug log file, to prevent file access.
• Add some convenient hooks for Checkout for WooCommerce.
• Stop parsing shortcodes in text widgets as WordPress core does this since version 4.9.

4.7 – Nov 7, 2019

Improvements

• Add role=alert to form notices.
• Add setting to pre-check sign-up checkbox for Gravity Forms integrations.
• Add new position for WooCommerce integration: directly after the billing_email field.
• Fix PHP notices for submitting a form and saving a form as an administrator.
• Add link to Koko Analytics plugin.

4.6.2 – Oct 24, 2019

Fixes

• Address fields in forms would always be required (even if really optional).

Improvements

• Add proper SVG admin menu icon.
• Minor overall performance and memory usage improvements.

4.6.1 – Oct 7, 2019

Fixes

• Fixed list cache usage for WPForms, Gravity Forms and Ninja Forms integrations.

4.6.0 – Oct 7, 2019

Improvements

• Improved fetch and cache mechanism for retrieving Mailchimp account details, fetching data only when it is required.
• Updated Mithril and CodeMirror dependencies.
• Decreased size of forms.js from 22KB to 9KB.
• No longer requiring jQuery anywhere.
• Increase API HTTP request timeout to 15 seconds.

Please note that installing this update requires you to also update any add-ons like Mailchimp Top Bar and Mailchimp for WordPress Premium (if installed).

4.5.5 – Sep 12, 2019

Fixes

• Google reCAPTCHA script was still loading even if no forms have it enabled.

4.5.4 – Sep 11, 2019

Improvements

• Removed custom color from menu item for improved accessibility.
• Take birthday field format into account when sending data to Mailchimp.
• Print Google reCAPTCHA script in footer.

Changes

• Changed plugin name to MC4WP instead of Mailchimp for WordPress.

4.5.3 – July 23, 2019

Fixes

• Temporarily switch status of pending subscribers to “unsubscribe” versus deleting susbcriber before re-subscribing.
• Deprecation notice for Gravity Forms version 2.4 and higher.

Improvements

• Filter out empty tags when applying tags to new subscribers.
• Show all not installed integrations.
• Show notice when form doesn’t have a Mailchimp list selected to subscribe people to.
• Check function existence for compatibility with WordPress 4.7
• Don’t submit form when Google reCAPTCHA is enabled but errors.
• Update third-party JavaScript dependencies.

4.5.2 – May 8, 2019

Improvements

• Accept more truthy values in custom integration for improved compatibility with third-party forms.
• Update JavaScript dependencies.
• Load Google reCaptcha script in footer (if needed).

4.5.1 – April 8, 2019

Additions

• Add sign-up integration for Give
• Add sign-up integration for UltimateMember

Improvements

• Write to debug log if Google reCAPTCHA secret key is incorrect.
• Validate reCAPTCHA keys when savings form settings.
• Allow setting an empty “successfully subscribed” message.

4.5.0 – March 27, 2019

Additions

• Built-in integration with Google reCAPTCHA to prevent bots from subscribing to your Mailchimp lists.

Improvements

• Minor improvements to the JavaScript that is loaded on admin pages.

4.4.0 – March 1, 2019

Fixes

• AffiliateWP integration subscribing the wrong user if affiliate ID differs from user ID.

Improvements

• Renamed “MailChimp” to “Mailchimp” to match Mailchimp’s new branding.
• More accurate handling of timeouts for accounts with many MailChimp lists.
• UX improvements for integrations overview page.
• Validate MailChimp API key format when it’s entered.
• Improved compatibility with Klarna Checkout in the WooCommerce checkout integration.
• Bumped required PHP version to 5.3 (soft requirement for now).

Additions

• Added Gutenberg block for easily adding a form to a post or page.
• Added subscriber tags setting to forms.

4.3.3 – December 31, 2018

Fixes

• Update WPForms integration to properly detect if the WPForms plugin is activated.

Improvements

• Write API request parameters to the debug log in case of connection timeouts.
• Update JavaScript dependencies.

4.3.2 – December 11, 2018

Fixes

• Use of readonly function, which is only available in WordPress 4.9 or later.

4.3.1 – November 28, 2018

Fixes

• Fatal error on PHP versions older than 5.5

4.3 – November 28, 2018

Additions

• Added MC4WP_API_KEY PHP constant which can be used to set your Mailchimp API key.
• Add mc4wp_mailchimp_list_limit filter hook to modify the maximum number of Mailchimp lists to fetch. Defaults to 200.

Improvements

• Apply mc4wp_integration_gravity-forms_options filter hook on Gravity Forms integration options so the checkbox can be prechecked and the checkbox label text modified.
• The updated_subscriber JS event is now fired forms not using AJAX as well (when applicable).

4.2.5 – Sep 11, 2018

Improvements

• Only re-add subscriber to list if we want to re-trigger a double opt-in confirmation email.
• Change Gravity Forms field name to “Mailchimp for WordPress”
• Get rid of cached result of Mailchimp API connection.

4.2.4 – July 9, 2018

Improvements

• Ensure type-safety on some global variables.
• Stop showing trashed forms immediately.
• Pre-check Mailchimp list when creating a new form if there is only 1 list.
• Send null for unknown values in usage tracking data (only when opted-in).

Additions

• Add methods for accessing Mailchimp’s e-commerce promo code endpoints to API class.

4.2.3 – June 11, 2018

Fixes

• Don’t wrap “agree to terms” input in hyperlink element.
• Allow [ENTER] key again after field helper overlay is closed.

Improvements

• Fallback to meta-refresh if redirect fails because of “headers already sent” error.

4.2.2 – May 22, 2018

Fixes

• Events Manager integration was not working with logged-in users.
• Form preview URL should respect admin HTTP(S) scheme.
• Removed use of PHP 5.4 function.

Improvements

• Add “agree to terms” checkbox to field helper.

Additions

• Add filter mc4wp_http_request_args.

4.2.1 – April 11, 2018

Fixes

• Namespace usage warning when running PHP 5.2

Improvements

• Remove obsolete type attribute from all <script> tags printed by the plugin.
• Improved tooltips on settings pages.
• Do not pre-check integration checkboxes by default.
• Add textual warnings to settings that may affect GDPR compliance.
• Update translation files.

4.2 – March 5, 2018

Additions

• Live form preview while editing form.

Improvements

• Improved conditional fields logic.
• Debug log now includes request & response data.
• Form JavaScript events are fired in an isolated thread now, to prevent errors in event callbacks from breaking form functionality.
• Don’t send empty field values to Mailchimp when updating subscribers.
• Show interest grouping ID in list overview on settings page.

Fixes

• Ninja Forms export checkbox would always state “checked” when form contained a Mailchimp sign-up checkbox.

4.1.15 – February 7, 2018

Fixes

• Dropdown fields with special characters were not properly passed to Mailchimp.
• Interest groups with an all-numeric ID were not properly passed to Mailchimp.

Improvements

• Various minor code optimizations
• Do not redirect when showing “already subscribed” warning.
• Improved scroll to form handling after a form is submitted without AJAX.

4.1.14 – January 8, 2018

Fixes

• Validate method was incorrectly checking required array fields.

Improvements

• Wrap some missing strings in translate calls. Thanks morlor.
• Make it clear that redirecting after successful form submissions will not show the “subscribed” message.

4.1.13 – December 28, 2017

Fixes

• Array to string conversion in default form messages.

Additions

• Allow marking Gravity Forms sign-up checkbox as a required field.

4.1.12 – December 11, 2017

Fixes

• Ninja Forms double opt-in setting was incorrectly inversed.

Improvements

• Simplified form processing & notice logic.
• Prevent 404 errors by proactively replacing lowercased name="name" input attributes.
• Updated JavaScript dependencies.

Additions

• Integration for AffiliateWP.

4.1.11 – November 2, 2017

Fixes

• Filter out empty array values when overriding selected Mailchimp lists via _mc4wp_lists.

Improvements

• Updated JavaScript dependencies.

Additions

• Link to the HTML Forms from the plugin settings pages.

4.1.10 – October 19, 2017

Improvements

• Remove unused options from Ninja Forms integration.
• Now logging all sign-ups from Ninja Forms integrations when using Mailchimp for WordPress Premium.

Additions

• Added Gravity Forms integration. You can now integrate with Gravity Forms by adding the “Mailchimp” field to your forms.

4.1.9 – September 19, 2017

Improvements

• Add <label> element to sign-up checkbox for WCAG compatibility.
• Custom integration now works with Enfold theme’s contact form element.

4.1.7 & 4.1.8 – September 8, 2017

Fixes

• Properly escape the return value of add_query_arg when it is used in HTML attributes to prevent cross-site scripting. Thanks to Karim Ouerghemmi of RIPS for responsibly disclosing.
• Now loading integrations after WPML so that String Translations work properly.

Additions

• Add sign-up integration for WPForms forms.

Improvements

• Updated internal JS dependencies.
• Form tag {data key="foo.bar"} now allows you to access nested array values.

4.1.6 – July 31, 2017

Fixes

• Method on API class for retrieving campaign data.

Improvements

• Show Akamai reference number when an API request is blocked by Mailchimp’s firewall.
• Minor output buffering improvements in form previewer.

4.1.5 – June 27, 2017

Fixes

• Failsafe against outputting sign-up checkbox twice in registration forms.
• Properly close HTML anchor element in French translation files.
• Fix BuddyPress sign-ups when using WordPress Multisite.

Improvements

• Fire action hook mc4wp_form_updated_subscriber whenever a form was used to update a subscriber in Mailchimp.
• Increase browser timeout for AJAX request when fetching Mailchimp lists.

Additions

• Added campaign & template methods to API client class.

4.1.4 – June 15, 2017

Fixes

• Some form specific JS events were not firing due to incorrect event names.
• Registration form integration now works with WooCommerce registration form.
• Notice that asks for a plugin review would re-appear after dismissing it.

4.1.3 – May 24, 2017

Improvements

• Randomise time of cron event that renews Mailchimp lists.
• Always try to show Mailchimp list info when API key is given.

4.1.2 – May 8, 2017

Fixes

• Use earlier hook priority for Ninja Forms 3 integration so action is registered on time.

Improvements

• Improved Mailchimp list fetching & memory usage for accounts with many lists.
• Show error message when fetching lists fails.
• Updated plugin translations.

4.1.1 – April 11, 2017

Fixes

• WPML String Translation not working with the checkbox label for sign-up integrations.

Improvements

• Use updated order methods when using WooCommerce 3.0, thanks to Liam McArthur.
• Updated JavaScript dependencies.

4.1.0 – March 14, 2017

Improvements

• Updated all JavaScript dependencies in the plugin.
• Failsafed filter hooks to prevent invalid variable types.
• Explain that greyed out integrations means that specific plugin is not activated.
• Conditional form elements now uses event delegation, so it works with forms in Boxzilla pop-ups.
• Updated language files.

Additions

• Added support for Ninja Forms 3.
• Added mc4wp_integration_show_checkbox filter.

4.0.13 – February 8, 2017

Improvements

• Ensure fields are HTML decoded before sending to Mailchimp.
• Better OptimizePress compatibility.
• Show all address-type fields as required when form contains 1 or more fields of the same address group.

4.0.12 – January 16, 2017

Fixes

• Don’t call stripslashes on POST data twice.

Improvements

• Plugin review notice is now dismissible over AJAX.
• Improved formatting of birthday fields.
• Updated Polish translations, thanks to Mateusz Lomber.
• Updated German translations, thanks to Sven de Vries.

Additions

• Add update_ecommerce_store_product method to API class.
• Throw form specific JavaScript events, like 15.subscribed to hook into “subscribed” events for form with ID 15.

4.0.11 – December 9, 2016

Fixes

• Unescaped request variable on integration settings page, allowing for authenticated XSS. Thanks to dxwsecurity for responsibly disclosing.

Improvements

• Add $args parameter to API::get_lists_activity method. Relates to the Mailchimp Activity plugin.

4.0.10 – December 6, 2016

Improvements

• You can now enable or disable debug logging from the “Other” settings page.
• No longer using deprecated function in Contact Form 7, thanks to stodorovic.
• Improved UI for adding hidden interest groupings fields to a form.

4.0.9 – November 23, 2016

Fixes

• Issue with escaped HTML when using form tags introduced by previous update.

4.0.8 – November 23, 2016

Improvements

• Improved handling of large debug logs.
• Improved error messages when writing exceptions to debug log.
• Show notice when form is missing required Mailchimp fields.
• Custom form integration now handles arrays with 1-level depth. Thanks to Mardari Igor.
• You can now use nested tags in your form code, eg {data key="utm_source" default="{current_path}"}

Additions

• Add data-hide-if attribute logic to forms. See conditionally hide form fields. Thanks to Kurt Zenisek.
• Add hooks for delayed BuddyPress sign-up. Thanks to Christian Wach.

4.0.7 – October 25, 2016

Improvements

• Obfuscate all email addresses in debug log. Thanks Sauli Lepola.
• Ask for confirmation before disabling double opt-in, which we do not recommend.
• Allow vertical resizing of debug log.
• Failsafe against including JavaScript file twice.
• No longer wrapping CF7 checkbox in paragraph tags.

Additions

• Added mc4wp_form_api_error action hook for API errors encountered by forms.
• Added element_class argument to [mc4wp_form] shortcode for adding CSS classes.

4.0.6 – October 10, 2016

Fixes

• Issue with lists not showing when using W3 Total Cache with APCu object cache enabled.

Improvements

• We’re no longer stripping newlines from text fields.

Additions

• Added missing e-commerce related API methods to API class.

4.0.5 – September 29, 2016

Fixes

• Allow checkbox option for the List Choice field (again).

Improvements

• Fetch Mailchimp lists over AJAX, to speed up perceived performance (especially when your account has many lists).
• Periodically fetch Mailchimp lists, so cache is always fresh.
• Improved <label> element accessibility for checkbox integrations.
• Stop using double underscore prefix in function names, as these are reserved in PHP 7.
• {post} and {user} shortcodes now accept a default parameter.

Additions

• Add MemberPress integration.
• Add missing e-commerce related API methods for next week’s WooCommerce Mailchimp e-commerce integration release.

4.0.4 – September 7, 2016

Improvements

• Allow re-running previous migrations by visiting a certain admin URL.
• Do not show checkboxes option for fields that only accept a single value.
• Write field specific errors to debug log when Mailchimp denies a sign-up request.
• Write to debug log when custom integrations can not find an EMAIL field.
• Differentiate between connection & authorization errors when testing connection to Mailchimp.
• Bump limit of number of Mailchimp lists to fetch from 100 to 500.

4.0.3 – August 24, 2016

Fixes

• Ninja Forms integration not working when using PayPal integration.

Improvements

• Show connection errors on Mailchimp settings page.

Additions

• Add pre-checked option to Ninja Forms integration.
• You can now conditionally hide fields or elements using the data-show-if attribute.

4.0.2 – August 10, 2016

Fixes

• Hidden fields which referenced interest groups by name were not sent to Mailchimp.
• Adding hidden field to form would reset value on every change.

Improvements

• Decrease file size of JavaScript for forms by about 30%.

4.0 & 4.0.1 – August 9, 2016

This release updates the plugin to version 3 of the Mailchimp API. Please read through the upgrade guide before updating to make sure things keep working as expected for you.

Changes

• “Send welcome email” is now handled from your list settings in Mailchimp.
• Filter mc4wp_form_merge_vars is now called mc4wp_form_data.
• Filter mc4wp_integration_merge_vars is now called mc4wp_integration_data.
• New format for GROUPING fields in forms & filter hooks.
• Value delimiter in hidden fields is now a pipe | character.

Additions

• New filter: mc4wp_form_subscriber_data.
• New filter: mc4wp_integration_subscriber_data.
• New form tag: {cookie name="mycookie"}

Improvements

• The plugin now communicates with the latest & greatest Mailchimp API.
• Previously unsubscribed subscribers can now be re-added without errors.
• Add User-Agent header to all API requests.
• Available fields in form editor are now split-up by category.
• Birthday fields now accept a broader range of values and delimiters.

Fixes

• Issue with only 10 Mailchimp lists / fields / interests being returned.
• Incorrect form message showing when double opt-in is disabled.
• Error in upgrade routine when API request fails.
• List fields not fetched when list has just 1 non-default merge field.

3.1.12 – July 28, 2016

Improvements

• Smarter scrolling after submitting form & reloading page.
• Format output of {subscriber_count} tag.
• You can now use <img> in your form messages.
• Add Mailchimp API error code to debug log lines.
• Add plugin name + version to User-Agent header for all Mailchimp API requests.
• Make sure value of MC_LANGUAGE field is limited to 2 characters.

3.1.11 – July 5, 2016

Improvements

• Update JavaScript dependencies for admin screens.
• Test debug log & show notice when it’s not writable.

Additions

• Add “placeholder” option for dropdown fields.

3.1.10 – June 21, 2016

Fixes

• Styles Builder in Premium not building because of incorrect flag in core plugin.

Improvements

• Don’t show position option for WooCommerce integration when sign-up is implicit.
• Improvements to form previewer logic.
• Make sure admin notifications are always shown exactly one time.

3.1.9 – June 7, 2016

Fixes

• Placeholder polyfill wasn’t loaded (only in IE8 and below).

Improvements

• Don’t write to debug log if it is not writable.
• Reset some CSS properties for commonly used class names in Form Editor & Debug Log.
• Do not unnecessarily register styles which are then immediately enqueued.

Additions

• Add “is required field” option for dropdown & radio fields in Field Helper.
• Link to Boxzilla plugin from admin sidebar.

3.1.8 – May 23, 2016

Fixes

• Form Preview mode replaced all titles on that page with “Form Preview”.
• API class fix for eCommerce360 functionality.

Improvements

• Show dismissible notice when API key is not set.
• Show empty API key errors in plugin log.
• Friendlier error message for re-subscribe failures.

Additions

• Add form.reset() method to JS API.

3.1.7 – May 9, 2016

Fixes

• Shortcode wasn’t accepting element_id as a valid attribute.
• Take array style fields into account when checking if a form contains a given field.

Improvements

• Nested fields will now be properly validated when they’re marked as required.
• If plugin is installed using Composer, autoloader won’t be loaded (again).

3.1.6 – April 12, 2016

Fixes

• Form event for starting a form was named start where it should have been started.

Improvements

• Some preparations for the upcoming migration to the new Mailchimp API (version 3).
• Consistent hook parameters for mc4wp_form_subscribed action.
• Improved logic for rendering form response.

Additions

• New checkbox position for WooCommerce checkout integration.

3.1.5 – March 22, 2016

Fixes

• Response message was shown for unsubmitted forms when using {response} in the form mark-up with multiple forms on the same page.

Improvements

• Scroll to form after form submission now uses native browser method scrollIntoView().
• Various improvements for right-to-left (RTL) sites.
• The Mailchimp API key is now obfuscated on the settings page.
• Contact Form 7 integration now uses an early hook priority to ensure we run before any page redirects.

Additions

• Add position option for WooCommerce integration.
• Add {post} tag whch can be used in form mark-up to fetch properties of the current page or post.

3.1.4 – February 29, 2016

Fixes

• Forms with address fields never passing validation.

Improvements

• Perform type checks on global variables to prevent issues with poorly coded plugins.
• Add Interest Category ID to list overview table for easier debugging.
• Updated Russian translations.

3.1.3 – February 17, 2016

Fixes

• Issue with API array responses (for the Mailchimp Activity add-on, for example).

Improvements

• Updated Dutch, Portugese, Spanish and Italian translations.

3.1.2 – February 15, 2016

Fixes

• Form JavaScript not working when another plugins loads Dojo framework.
• [ENTER] not submitting form settings or creating new-line.
• Internal fields marked as required not passing form validation.
• Deselecting all Mailchimp lists wouldn’t persist after saving form settings.
• No sign-up request firing for lists with only an EMAIL field.

Improvements

• Show accepted choice values for dropdown and radio fields in lists overview.
• Use all Mailchimp lists for Lists Choice field, instead of just the selected ones.
• Failsafed JavaScript for when any other script loads RequireJS globally.

Additions

• Added support for Shortcake plugin.
• Error message for when no list is selected can now be customized from the form message settings.

3.1.1 – February 1, 2016

Fixes

• Field Helper not adding type attribute when building forms.
• Field Helper not setting the correct value attribute for Hidden Groups.

Improvements

• Add sourcemaps to minified JavaScript files.
• Add link to article on how to enable debug logging.
• Field Helper now always shows both placeholder and value fields.

3.1 – January 26, 2016

Fixes

• <input> fields being stripped from form when saving as a role other than “superadmin” on MultiSite installations.
• Certain actions like “renew lists” not working for users other than admin (if they have explicit access to settings pages).

Improvements

• Show Akamai firewall reference number when site’s IP address is blocked
• Make sure integrations have a Mailchimp list selected before trying to subscribe.
• Move less important settings to “Other” page.
• When a field is required in Mailchimp, it has to be required in forms as well now.
• Allow including a _mc4wp_email_type field in forms to set an explicit email type.
• Miscellaneous overall performance improvements.

Additions

• Added debug logging, which shows all warnings & errors the plugin encountered in communicating with Mailchimp.
• Add get_lists_for_email( $email ) method to API class.
• Add MC4WP_Queue class for better background processing of expensive operations.

3.0.12 – January 15, 2016

Fixes

• Incorrect hooks being fired for successful and unsuccessful form sign-ups (which also broke the success redirect).

3.0.11 – January 14, 2016

Improvements

• Allow splitting up “birthday” and “date” fields into separate fields with day, month and year index.
• Improved algorithm for finding fields when integrating with Contact Form 7 or other custom forms.
• Ninja Forms integration can now automatically find name-fields.
• Ninja Forms integration can now use mc4wp- prefixed admin labels.

Additions

• add_ecommerce_order() and delete_ecommerce_order() methods to API class.

3.0.10 – January 6, 2016

Fixes

• 500 server error for “already subscribed” on Windows servers.
• Incorrect HTML being generated for hidden fields.
• Duplicate sign-up request when using CF7 integration.

Improvements

• Stop logging “already subscribed” errors to PHP’s error log.
• Simplify pattern attribute for date fields.
• Remove invalid autofill attribute from honeypot field.

3.0.9 – December 17, 2015

Fixes

Not being able to select a list when creating a new form.

3.0.8 – December 15, 2015

Fixes

• Make sure mc4wp_show_form() works without passing a form ID.

Improvements

• Remove UI for bulk-enabling integrations, as every integration needs specific settings anyway.
• Do not print inline JavaScript for forms until it’s surely needed.
• Add position key to mc4wp_admin_menu_items filter to set a menu position.
• Various minor code improvements.

3.0.7 – December 10, 2015

Fixes

Workaround for SSL certification bug in WordPress 4.4, affecting servers with an older versions of OpenSSL installed.

Additions

Added mc4wp_use_sslverify filter to disable or explicitly enable SSL certificate verification.

3.0.4 – December 7, 2015

Fixes

• Fixes compatibility issues with add-on plugins performing validation, like Goodbye Captcha and BWS Captcha.

Improvements

• Now using group ID’s for interest grouping fields, so changing the group in Mailchimp does not require updating your form code.
• Never load enabled integrations which are not installed.
• Reintroduce support for automatically sending OPTIN_IP

Additions

• Add filter: mc4wp_form_data, filters form data before it is processed.

3.0.3 – November 30, 2015

Fixes

• Added backwards compatibility for Goodbye Captcha integration.

Improvements

• Prevented notice when saving Form widget settings for the first time.
• Add autofill="off" to honeypot field.
• Remove nonces from forms as they’re not really useful for publicly available features.
• Errors returned by Mailchimp are now logged for Forms as well.
• Pre-select Mailchimp list if there’s just one list in the connected account.
• Added missing translation calls for Form Editor.

3.0.2 – November 25, 2015

Fixes

• Redirect on success not working.
• Forms overview page redirected to main WP Admin page (edge case).
• Safari was always showing the leave-page confirmation dialog.

Improvements

• Add form-specific classes to preview form element. This allows the Styles Builder to work with the Form Preview.
• Form events are now triggered after the page has finished loading, so all scripts are loaded & ready to use.
• Reset background-color in Form Themes stylesheets.

3.0.0 & 3.0.1 – November 23, 2015

Version 3.0 is a total revamp of the plugin. For a quick overview of the changes, please read this post on our blog.

Before upgrading, please go through the upgrade guide as some things have changed.

Breaking Changes

• Captcha fields: {captcha} field is now handled by the Captcha add-on plugin.
• New dynamic content tags syntax: {data_NAME} is now {data key="NAME"}
• Event binding: jQuery(document).on('subscribe.mc4wp','.mc4wp-form', function(){ ... }) is now mc4wp.forms.on('subscribed', function(form) { ... })
• Removed integrations: MultiSite & bbPress.

Improvements

• New form editor with syntax highlighting, more advanced field options & better visual feedback.
• Better support for Mailchimp address fields.
• Better support for choice fields (eg groupings, list choice & country fields).
• All fields marked as required are now validated server-side as well (instead of just Mailchimp required fields).
• All integrations have their own settings page now.
• Events Manager: checkbox is now automatically added to booking forms.
• Tons of usability & accessibility improvements.
• Tons of code improvements: improved memory usage, 100+ new unit tests & better usage of various best practices.
• The premium plugin is now an add-on of this plugin.

Additions

• New “Preview Form” option, showing unsaved form changes.
• Integrations can now be “implicit”, thus no longer showing a checkbox option to visitors.
• New JavaScript API, replacing jQuery event hooks.
• Ninja Forms integration
• Introduced various new filter & action hooks, please see the new code reference for developers for more information.

2.3.18 – November 2, 2015

Fixes

• Incorrect number of parameters for error_log statement in integrations class.

Improvements

• Usage tracking is now scheduled once a week (instead of daily).
• Preparations for the upcoming Mailchimp for WordPress version 3.0 release.
• Tested compatibility with WordPress 4.4

2.3.17 – October 22, 2015

Fixes

• Honeypot field being autofilled in Chrome, causing a form error.

Improvements

• Updated Portugese translations.

2.3.16 – October 14, 2015

Fixes

• Error in Russian translation, causing a broken link on the Mailchimp settings page.

Improvements

• Textual improvements to Mailchimp settings page.
• Connectivity issues with Mailchimp will now always show an error message.
• Renewing Mailchimp lists will now also update the output of the {subscriber_count} tag.

2.3.15 – October 9, 2015

Fixes

• Fixes JS error when form contains no submit button

Improvements

• Only prefix url fields with http:// if it is filled.
• Updated Spanish & Catalan translations, thanks to Xavier Gimeno Torrent.
• Fix mc4wp_form_before_fields being applied twice.
• Position honeypot field to the right for Right-To-Left sites.
• _mc4wp_lists can now be a comma-separated string of Mailchimp list ID’s to subscribe to (or an array).
• Minor other defensive coding improvements to prevent clashes with other plugins.

Additions

• Added opt-in usage tracking to help us make the plugin better. No sensitive data is tracked.

2.3.14 – September 25

Fixes

• Use of undefined constant in previous update.

2.3.13 – September 25, 2015

Fixes

• Honeypot causing horizontal scrollbar on RTL sites.
• List choice fields not showing when using one of the default form themes.

Improvements

• Minor styling improvements for RTL sites.
• Mailchimp list fields of type “website” will now become HTML5 url type fields.
• Auto-prefix fields of type url with http://

2.3.12 – September 21, 2015

Fixes

• Issue with interest groupings not being fetched after updating to version 2.3.11

2.3.11 – September 21, 2015

Fixes

• Honeypot field being filled by browser’s autocomplete.
• Styling issue for submit buttons in Mobile Safari.
• Empty response from Mailchimp API

Improvements

• Do not query Mailchimp API for interest groupings if list has none.
• Integration errors are now logged to PHP’s error log for easier debugging.

Additions

• You can now use shortcodes in the form content.

2.3.10 – September 7, 2015

Fixes

• Showing “not connected” when the plugin was actually connected to Mailchimp.
• Issue with address fields when addr1 was not given.
• Comment form checkbox not outputted for some older themes.

Improvements

• Do not flush Mailchimp cache on every settings save.
• Add default CSS styles for number fields.
• Placeholders will now work in older version of IE as well.

2.3.9 – September 1, 2015

Improvements

• Mailchimp lists cache is now automatically flushed after changing your API key setting.
• Better field population after submitting a form with errors.
• More helpful error message when no list is selected.
• Translate options when installing plugin from a language other than English.
• Add form mark-up to WPML configuration file.
• Sign-up checkbox in comment form is now shown before the “submit comment” button.
• URL-encode variables in “Redirect URL” setting.
• Better error message when connected to Mailchimp but account has no lists.

Additions

• Add mc4wp_form_action filter to set a custom action attribute on the form element.

2.3.8 – August 18, 2015

Fixes

• Prevented JS error when outputting forms with no submit button.
• Using 0 as a Redirect URL resulted in a blank page.
• Sign-up checkbox was showing twice in the Easy Digital Downloads checkout when showing registration fields, thanks Daniel Espinoza.
• Default form was not automatically translated for languages other than English.

Improvements

• Better way to hide the honeypot field, which stops bots from subscribing to your lists.
• role=”form” is no longer needed, thanks XhmikosR!
• Filter mc4wp_form_animate_scroll now disables just the scroll animation, not the scroll itself.
• Revamped UI for Mailchimp lists overview
• Updated German & Greek translations.

Additions

• Added mc4wp_form_is_submitted() and mc4wp_form_get_response_html() functions.

2.3.7 – July 13, 2015

Improvements

• Use the same order as Mailchimp.com, which is useful when you have over 100 Mailchimp lists.
• Use /* ... */ for inline JavaScript comments to prevent errors with minified HTML – props Ed Gifford

Additions

• Filter: mc4wp_form_animate_scroll to disable animated scroll-to after submitting a form.
• Add {current_path} variable to use in form templates.
• Add default attribute to {data_name} variables, usage: {data_something default="The default value"}

2.3.6 – July 6, 2015

Fixes

• Undefined index notice when visitor’s USER_AGENT is not set.

Improvements

• Relayed the browser’s Accept-Language header to Mailchimp for auto-detecting a subscriber’s language.
• Better CSS for form reset
• Updated HTML5 placeholder polyfill

2.3.5 – June 24, 2015

Fixes

• Faulty update for v3.0 appearing for people running GitHub updater plugin.

Improvements

• Updated language files.
• Now passing the form as a parameter to mc4wp_form_css_classes filter.

2.3.4 – May 29, 2015

Fixes

• Issue with GROUPINGS not being sent to Mailchimp

Improvements

• Code preview in Field Builder is now read-only

2.3.3 – May 27, 2015

Fixes

• Get correct IP address when using proxy like Cloudflare or Sucuri WAF.
• Use strict type check for printing inline CSS that hides honeypot field

Improvements

• Add contactemail and contactname to field name guesses when integrating with third-party form.
• Re-enable sslverify

2.3.2 – May 12, 2015

Fixes

• Groupings not being sent to Mailchimp
• Issue when using more than one {data_xx} replacement

Improvements

• IE8 compatibility for honeypot fallback script.

2.3.1 – May 6, 2015

Fixes

• PHP notice in includes/class-tools.php, introduced by version 2.3.

2.3 – May 6, 2015

Fixes

• The email address is no longer automatically added to the Redirect URL as this is against Google Analytics policy. To add it again, use ?email={email} in your Redirect URL setting.
• Registration type integrations were not correctly picking up on first- and last names.
• JavaScript error in IE8 because of setAttribute call on honeypot field.
• API class subscribe method now always returns a boolean.

Improvements

• Add role attribute to form elements
• Major code refactoring for easier unit testing and improved code readability.
• Use Composer for autoloading all plugin classes (PHP 5.2 compatible)
• You can now use form variables in both forms, messages as checkbox label texts.

Additions

• You can now handle unsubscribe calls with our forms too.
• Added Portugese, Indonesian, German (CH) and Spanish (PR) translations.

2.2.9 – April 15, 2015

Fixes

• Menu item for settings page not appearing on Google App Engine (#88)

Improvements

• Updated Italian, Russian & Turkish translations.

2.2.8 – March 24, 2015

Fixes

• API key field value was not properly escaped.
• Background images were stripped from submit buttons.

Improvements

• Better sanitising of all settings
• Updated all translations

Additions

• Added mc4wp_before_checkbox and mc4wp_after_checkbox filters to easily add more fields to sign-up checkbox integrations.
• Added some helper methods related to interest groupings to MC4WP_MailChimp class.
• Allow setting custom Mailchimp lists to subscribe to using lists attribute on shortcode.

2.2.7 – March 11, 2015

Fixes

• Honeypot field was visible for themes or templates not calling wp_head() and wp_footer()

Improvements

• Various minor code improvements
• Updated German, Spanish, Brazilian, French, Hungarian and Russian translations.

Additions

• Added mc4wp_form_success action hook to hook into successful sign-ups
• Added mc4wp_form_data filter hook to modify all form data before processing

2.2.6 – February 26, 2015

Fixes

• CSS reset wasn’t working for WooCommerce checkout sign-up checkbox.
• mc4wp-submitted class was not added in IE8
• Incorrect action attribute on form element for some server configurations

Improvements

• Anti-SPAM improvements: a better honeypot field and a timestamp field to prevent instant form submissions.
• Reset background-image on submit buttons when using CSS themes
• Smarter email detection when integrating with third-party forms
• Updated all translations

Additions

• Custom fallback for browsers not supporting input[type="date"]

2.2.5 – February 13, 2015

Fixed

• Issue where WooCommerce checkout sign-up was not working for cheque payments.
• Translation were loaded too late to properly translate some strings, like the admin menu items.

Improvements

• The presence of required list fields in form mark-up is now checked as you type.
• Number fields will now repopulate if an error occurred.
• Updated all translations.
• Make sure there is only one plugin instance.
• Various other code improvements.

Additions

• Added support for GitHub Updater Plugin.
• You can now specify whether you want to send a welcome email (only with double opt-in disabled).

A huge thank you to Stefan Oderbolz for various fixed and improvements related to translations in this release.

2.2.4 – February 4, 2015

Fixed

• Textual fix as entering “0” for no redirection does not work.

Improvements

• Moved third-party scripts to their own directory for easier exclusion
• All code is now adhering to the WP Code Standards
• Updated Dutch, German, Spanish, Hungarian, French, Italian and Turkish translations.

Additions

• Now showing a heads up when at limit of 100 Mailchimp lists. (#71)
• Added wpml-config.xml file for better WPML compatibility
• Added filter mc4wp_menu_items for adding & removing menu items from add-ons

2.2.3 – January 24, 2015

Minor improvements and additions for compatibility with the Mailchimp User Sync plugin.

2.2.2 – January 13, 2015

Fixes

• Plugin wasn’t connecting to Mailchimp for users on Mailchimp server us10 (API keys ending in -us10)

2.2.1 – January 12, 2015

Improvements

• Use JS object to transfer lists data to Field Wizard.
• Field Wizard strings are now translatable
• Add is_spam method to checkbox integration to battle spam sign-ups
• Minor code & code style improvements
• Updated Danish, German, Spanish, French, Italian and Portugese (Brazil) translations

Additions

• You can now set MC_LOCATION, MC_NOTES and MC_LANGUAGE from your form HTML
• The submit button now has a default value when generating HTML for it

2.2 – December 9, 2014

Fixes

• “Select at least one list” notice appearing when unselecting any Mailchimp list in Form settings
• If an error occurs, textareas will no longer lose their value

Improvements

• Improved the way form submissions are handled
• Minor code & documentation improvements
• Updated Dutch, French, Portugese and Spanish translations

Additions

• Added sign-up checkbox integration for WooCommerce checkout.
• Added sign-up checkbox integration for Easy Digital Downloads checkout.
• The entered email will now be appended to the URL when redirecting to another page