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JavaScript Filters Reference

REQUIREMENTS

JavaScript hooks use the WordPress Hooks API (wp.hooks). Add your code to a custom JavaScript file enqueued after Better Messages.

This page lists all JavaScript filter hooks available in the Better Messages plugin frontend. Filters allow you to modify data, customize UI elements, and control client-side behavior.

UI Elements​

better_messages_header_element​

Replaces or modifies the header element at the top of the threads list page. Return an HTML string or React JSX element. The page parameter identifies which page is rendering (currently 'index'), and mobileView indicates if the mobile layout is active.

Parameters:

  • header (JSX.Element) — Default IndexHeader component
  • page (string) — Page identifier ('index')
  • mobileView (boolean) — Whether mobile view is active

Returns: JSX.Element|string — React component or HTML string

wp.hooks.addFilter('better_messages_header_element', 'my_plugin', function(header, page, mobileView) {
    if (mobileView) {
        return '<div class="custom-header">Messages</div>';
    }
    return header;
});

Header element example

Replaces or modifies the footer element at the bottom of the threads list page. Return an HTML string or React JSX element. Works the same as the header element filter with page and mobileView parameters.

Parameters:

  • footer (JSX.Element) — Default ChatFooter component
  • page (string) — Page identifier ('index')
  • mobileView (boolean) — Whether mobile view is active

Returns: JSX.Element|string

wp.hooks.addFilter('better_messages_footer_element', 'my_plugin', function(footer, page, mobileView) {
    if (page === 'index') {
        return '<div class="my-custom-footer">Add <strong>custom</strong> content</div>';
    }
    return footer;
});

Footer element example

better_messages_messages_list_before​

Adds HTML content above the messages list, before the message history begins. The HTML is parsed and rendered as React elements. Return an empty string to show nothing. Useful for thread-specific announcements, encryption status banners, or custom info boxes.

Parameters:

  • content (string) — Default empty string
  • thread (object) — Thread object

Returns: string — HTML string

wp.hooks.addFilter('better_messages_messages_list_before', 'my_plugin', function(content, thread) {
    if (thread.type === 'group') {
        return '<div class="group-notice">Welcome to the group chat!</div>';
    }
    return content;
});

Messages list before example

better_messages_send_button_after​

Adds HTML content after the send button in the reply form area. The HTML is rendered inline with the send button. Useful for adding custom action buttons, emoji shortcuts, or addon-specific controls next to the message composer.

Parameters:

  • content (string) — Default empty string
  • thread (object) — Thread object

Returns: string — HTML string

wp.hooks.addFilter('better_messages_send_button_after', 'my_plugin', function(content, thread) {
    return '<button class="my-custom-btn" onclick="myAction()">+</button>';
});

Send button after example

better_messages_participants_list_after​

Adds HTML content after the participants list in thread information panel.

Parameters:

  • content (string) — Default empty string
  • thread (object) — Thread object

Returns: string — HTML string

wp.hooks.addFilter('better_messages_participants_list_after', 'my_plugin', function(html, thread) {
    html += '<div class="my-custom-html">Add <strong>custom</strong> data</div>';
    return html;
});

Participants list after example

better_messages_user_settings_after​

Adds custom settings sections after the user settings options.

Parameters:

  • elements (array) — Default empty array

Returns: array — Array of React elements

Message Styling & Context Menu​

better_messages_single_message_class​

Adds custom CSS classes to individual message elements in the message list. The message object contains all message properties (sender_id, thread_id, content, etc.) so you can conditionally style messages based on sender, content, or metadata.

Parameters:

  • className (string) — Current CSS classes
  • message (object) — Message object

Returns: string

wp.hooks.addFilter('better_messages_single_message_class', 'my_plugin', function(className, message) {
    if (message.sender_id === 1) {
        className += ' admin-message';
    }
    return className;
});

better_messages_single_message_context_menu​

Modifies the context menu items shown when right-clicking or long-pressing a message. Each menu item should have key, label, icon (SVG string), and action (callback function) properties. You can add, remove, or reorder items in the array.

Parameters:

  • items (array) — Array of MessageContextMenuItem objects
  • message (object) — Message object
  • thread (object) — Thread object

Returns: array

Available properties for menu items: key (string, required for React), label (string), icon (string, SVG HTML), action (function, callback on click).

wp.hooks.addFilter('better_messages_single_message_context_menu', 'my_plugin', function(items, message, thread) {
    items.push({
        key: 'context-report-item',
        icon: '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-2h2v2zm0-4h-2V7h2v6z"/></svg>',
        label: 'Report',
        action: function() {
            alert('Reported message #' + message.message_id);
        }
    });
    return items;
});

Message context menu example

better_messages_video_preload_attribute​

Controls the preload attribute for video players in messages.

Parameters:

  • preload (string) — Default 'auto'

Returns: string — 'none', 'metadata', or 'auto'

wp.hooks.addFilter('better_messages_video_preload_attribute', 'my_plugin', function() {
    return 'metadata'; // Save bandwidth
});

Thread Styling & Context Menu​

better_messages_single_thread_class​

Adds custom CSS classes to individual thread items in the threads list sidebar. The thread object contains all thread properties (thread_id, type, subject, unread_count, etc.) so you can conditionally style threads based on state or metadata.

Parameters:

  • className (string) — Current CSS classes
  • thread (object) — Thread object

Returns: string

wp.hooks.addFilter('better_messages_single_thread_class', 'my_plugin', function(className, thread) {
    if (thread.pinned) {
        className += ' pinned-thread';
    }
    return className;
});

better_messages_thread_context_menu​

Modifies the context menu actions shown when right-clicking or long-pressing a thread in the threads list. Each action should have key, label, tooltip, icon, classes, showInThread, showInList, onClick, and optionally onAuxClick properties.

Parameters:

  • actions (array) — Array of ThreadAction objects
  • thread (object) — Thread object
  • anotherUser (object|false) — Other user in PM, or false
  • isMiniChat (boolean) — Whether in mini chat mode

Returns: array

Available properties for actions: key (string, required for React), label (string), tooltip (string), icon (string, SVG HTML), classes (string, CSS classes), showInThread (bool), showInList (bool), onClick (function), onAuxClick (function, middle-click).

wp.hooks.addFilter('better_messages_thread_context_menu', 'my_plugin', function(buttons, thread, anotherUser, isMiniChat) {
    buttons.push({
        key: 'custom-action',
        showInThread: true,
        showInList: true,
        tooltip: 'Archive this conversation',
        label: 'Archive',
        icon: '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24"><path d="M20.54 5.23l-1.39-1.68C18.88 3.21 18.47 3 18 3H6c-.47 0-.88.21-1.16.55L3.46 5.23C3.17 5.57 3 6.02 3 6.5V19c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2V6.5c0-.48-.17-.93-.46-1.27zM12 17.5L6.5 12H10v-2h4v2h3.5L12 17.5z"/></svg>',
        classes: 'bm-archive-action',
        onClick: function() {
            alert('Archive thread #' + thread.thread_id);
        }
    });
    return buttons;
});

Thread context menu example

better_messages_threads_list_selector​

Filters the database query selector for the threads list.

Parameters:

  • selector (object) — Default: { isDeleted: 0, isHidden: 0, adminAccess: { $exists: false } }

Returns: object

wp.hooks.addFilter('better_messages_threads_list_selector', 'my_plugin', function(selector) {
    // Only show group threads
    selector.type = 'group';
    return selector;
});

User Elements​

better_messages_avatar_class​

Adds custom CSS classes to user avatar elements throughout the UI. The default includes 'avatar bbpm-avatar' and an 'online' class when the user is online. The user object provides user data for conditional styling.

Parameters:

  • className (string) — Default 'avatar bbpm-avatar' + online status
  • user (object) — User object

Returns: string

wp.hooks.addFilter('better_messages_avatar_class', 'my_plugin', function(className, user) {
    if (user.verified) {
        className += ' verified-avatar';
    }
    return className;
});

better_messages_avatar_attributes​

Adds custom HTML attributes to avatar elements.

Parameters:

  • attributes (object) — Default empty object
  • user (object) — User object

Returns: object

wp.hooks.addFilter('better_messages_avatar_attributes', 'my_plugin', function(attrs, user) {
    attrs['data-role'] = user.role || 'member';
    return attrs;
});

better_messages_before_avatar_click​

Intercepts avatar click events before the default profile navigation occurs. Return true to prevent the default behavior and handle the click yourself (e.g., open a custom profile modal). Return false to allow normal navigation.

Parameters:

  • prevented (boolean) — Default false
  • user_id (number) — User ID

Returns: boolean

wp.hooks.addFilter('better_messages_before_avatar_click', 'my_plugin', function(prevented, userId) {
    // Open custom profile modal instead of navigating
    openProfileModal(userId);
    return true; // Prevent default navigation
});

better_messages_username_class​

Adds custom CSS classes to username elements.

Parameters:

  • className (string) — Default 'user bm-user'
  • user (object) — User object

Returns: string

wp.hooks.addFilter('better_messages_username_class', 'my_plugin', function(classes, user) {
    classes += ' notranslate';
    return classes;
});

better_messages_username_attributes​

Adds custom HTML attributes to username elements.

Parameters:

  • attributes (object) — Default empty object
  • user (object) — User object

Returns: object

better_messages_before_username_click​

Intercepts username click events before the default profile navigation occurs. Return true to prevent the default behavior and handle the click yourself. Return false to allow normal navigation to the user's profile.

Parameters:

  • prevented (boolean) — Default false
  • user_id (number) — User ID

Returns: boolean

wp.hooks.addFilter('better_messages_before_username_click', 'my_plugin', function(prevented, userId) {
    openProfileModal(userId);
    return true;
});

Message Sending​

better_messages_before_message_sent​

Prevents message sending or performs custom validation before a message is sent. Return true to block the message from being sent (the user stays in the composer). Return false to allow sending to proceed normally.

Parameters:

  • prevented (boolean) — Default false
  • threadId (number) — Thread ID
  • thread (object) — Thread object

Returns: boolean — true to prevent, false to allow

wp.hooks.addFilter('better_messages_before_message_sent', 'my_plugin', function(prevented, threadId, thread) {
    if (!confirm('Are you sure you want to send this message?')) {
        return true; // Prevent sending
    }
    return false;
});

API & Network​

better_messages_api_request_config​

Modifies the axios request configuration before any Better Messages REST API call is made. The config object includes URL, headers, data, and method. Use this to add custom headers, modify URLs, or inject authentication tokens for external auth systems.

Parameters:

  • config (object) — Axios request config (URL, headers, data, etc.)

Returns: object

wp.hooks.addFilter('better_messages_api_request_config', 'my_plugin', function(config) {
    config.headers['X-Custom-Header'] = 'my-value';
    return config;
});

better_messages_api_response​

Filters API responses before they are processed by the application. Receives the full axios response object including status, data, and headers. Use this to transform response data, handle custom headers, or log API interactions.

Parameters:

  • response (object) — Axios response object

Returns: object

wp.hooks.addFilter('better_messages_api_response', 'my_plugin', function(response) {
    // Transform or log response data
    console.log('API response:', response.config.url, response.status);
    return response;
});

better_messages_unhandled_api_error​

Handles unhandled API errors. Return a new config to retry, or false to reject.

Parameters:

  • retry (boolean) — Default false
  • response (object) — Error response
  • config (object) — Original request config

Returns: object|false

wp.hooks.addFilter('better_messages_unhandled_api_error', 'my_plugin', function(retry, response, config) {
    if (response.status === 401) {
        // Redirect to login
        window.location.href = '/login';
    }
    return false;
});

better_messages_navigate_url​

Intercepts URL navigation when opening conversations. Return true if you handle navigation yourself.

Parameters:

  • handled (boolean) — Default false
  • url (string) — Target URL

Returns: boolean

wp.hooks.addFilter('better_messages_navigate_url', 'my_plugin', function(handled, url) {
    // Use SPA router instead of full page reload
    myRouter.push(url);
    return true;
});

File Uploads​

better_messages_uploader_enabled​

Controls whether file drag-and-drop and paste upload functionality is enabled globally. Return false to completely disable file uploads in the UI. When disabled, the upload button and drag-drop zones are removed.

Parameters:

  • enabled (boolean) — Default true

Returns: boolean

wp.hooks.addFilter('better_messages_uploader_enabled', 'my_plugin', function() {
    return false; // Disable file uploads
});

better_messages_open_uploader_modal​

Controls whether the file uploader modal opens.

Parameters:

  • open (boolean) — Default true
  • buttonRef (HTMLElement|null) — Upload button reference

Returns: boolean

Calls​

better_messages_call_show_notification​

WebSocket Version

This functionality is available only with the WebSocket version.

Controls whether to show the incoming call notification.

Parameters:

  • show (boolean) — Default true
  • message (object) — Incoming call data

Returns: boolean

wp.hooks.addFilter('better_messages_call_show_notification', 'my_plugin', function(show, message) {
    // Suppress notification for specific threads
    if (message.thread_id === 123) return false;
    return show;
});

better_messages_call_show_incoming_screen​

WebSocket Version

This functionality is available only with the WebSocket version.

Controls whether to show the incoming call screen.

Parameters:

  • show (boolean) — Default true
  • data (object) — Incoming call data

Returns: boolean

better_messages_call_answer_force​

WebSocket Version

This functionality is available only with the WebSocket version.

Indicates whether a call was answered by an external system (e.g., VoIP).

Parameters:

  • answered (boolean) — Default false
  • messageId (number) — Call message ID
  • threadId (number) — Thread ID

Returns: boolean

better_messages_call_create_not_allowed​

Controls whether to show error when call creation is denied.

Parameters:

  • showError (boolean) — Default true
  • thread_id (number) — Thread ID
  • type (string) — 'audio' or 'video'

Returns: boolean

better_messages_call_join_not_allowed​

Controls whether to show error when joining a call is denied.

Parameters:

  • showError (boolean) — Default true
  • thread_id (number) — Thread ID
  • type (string) — 'audio' or 'video'

Returns: boolean

better_messages_outgoing_call_not_allowed​

Controls whether to show error when starting an outgoing call is denied.

Parameters:

  • showError (boolean) — Default true
  • user_id (number) — Recipient user ID
  • thread_id (number) — Thread ID
  • type (string) — 'audio' or 'video'

Returns: boolean

better_messages_group_video_call_items​

WebSocket Version

This functionality is available only with the WebSocket version.

Filters the map of participants displayed in group video calls.

Parameters:

  • items (Map) — Map of participant identity to GroupVideoParticipantData
  • thread (object) — Thread object

Returns: Map

Miscellaneous​

better_messages_max_toasts_limit​

Limits the maximum number of toast notifications (on-site popups for new messages) displayed at the same time. Return null for unlimited toasts, or a number to cap them. Older toasts are removed when the limit is exceeded.

Parameters:

  • limit (null|number) — Default null (no limit)

Returns: null|number

wp.hooks.addFilter('better_messages_max_toasts_limit', 'my_plugin', function() {
    return 3; // Max 3 toasts
});

Toast notifications example

better_messages_emoji_important​

Controls whether the !important flag is applied to emoji CSS styles. Default is true to ensure emojis render correctly regardless of theme CSS. Return false if emoji styles conflict with your theme and you want to manage emoji sizing yourself.

Parameters:

  • useImportant (boolean) — Default true

Returns: boolean

wp.hooks.addFilter('better_messages_emoji_important', 'my_plugin', function() {
    return false; // Remove !important from emoji styles
});

better_messages_no_sleep_enable​

Controls whether screen lock prevention activates during calls.

Parameters:

  • enable (boolean) — Default true

Returns: boolean

better_messages_no_sleep_disable​

Controls whether screen lock prevention deactivates after calls.

Parameters:

  • disable (boolean) — Default true

Returns: boolean