Difference between revisions of "JReviews:Developers Filters"
From JReviews Documentation
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| − | = What is a Filter | + | = What is a Filter? = |
| − | + | JReviews has many filter hooks strategically placed in the code at points where you may want to change or override the value of a variable at runtime. | |
| + | |||
| + | Filters can modify data by binding a callback function to a filter hook. When the filter is executed, each callback function is run in order of priority, and can modify the filtered data by returning a new value. | ||
For example, you can use a filter to: | For example, you can use a filter to: | ||
Revision as of 11:04, 14 February 2018
JReviews 3 comes with Filters that allow you to make certain types of customizations and extend the functionality of JReviews without having to modify core files.
Contents
What is a Filter?
JReviews has many filter hooks strategically placed in the code at points where you may want to change or override the value of a variable at runtime.
Filters can modify data by binding a callback function to a filter hook. When the filter is executed, each callback function is run in order of priority, and can modify the filtered data by returning a new value.
For example, you can use a filter to:
- Change the page title and metatags of different pages
- Override the permissions of specific users or user groups for different events (creating listings, reviews, etc.)
- Add or remove CSS and Scripts to and from the page.
Defining a Filter
Typically you will not need to do this because JReviews 3 already comes with many filters and we'll add more over time. However, if you need to create a new filter that is not yet available this is the syntax from creating one:
$data = \Clickfwd\Hook\Filter::filter('filter_name', $data, ['foo'=>$bar]);
Where:
- $data is the variable that can be modified by the filters
- $params is an array of reference variables that can be used inside the filter logic
Using Filter Functions
To use a filter you need to create a filter function using the following syntax:
function filter_callback_function($data, $params = []) { return $data; } Clickfwd\Hook\Filter::add('filter_name', 'filter_callback_function', $priority = 10);
The $data variable can be modified inside the callback function and must always be returned at the end of the function.
To create new filter functions that are not overwritten on upgrades, create a new file in overrides and place your filter functions there:
Joomla
/templates/jreviews_overrides/filters/filter_functions.php
WordPress
/templates/jreviews_overrides/filters/filter_functions.php
Available Filters
Notifications
$payload = \Clickfwd\Hook\Filter::filter('listing_inquiry_email_payload', $payload, ['event'=>$event]);
Asset Manager
266: self::$css = Hook::filter('asset_manager_stylesheets', self::$css);
312: self::$js = Hook::filter('asset_manager_scripts', self::$js);
Metatags
160: $robots = Hook::filter('page_robots_metatag', $robots, $params);
182: $title = Hook::filter('page_title_metatag', $title, $params);
202: $keywords = Hook::filter('page_keywords_metatag', $keywords, $params);
214: $description = Hook::filter('page_description_metatag', $description, $params);
226: $canonical = Hook::filter('page_canonical_metatag', $canonical, $params);
238: $prev = Hook::filter('page_prev_metatag', $prev, $params);
248: $next = Hook::filter('page_next_metatag', $next, $params);
Listing Detail
541: $menuExtras = Clickfwd\Hook\Filter::filter('listing_detail_action_buttons', $menuExtras, [['listing'=>$listing]]);
Listing Permissions
57: return $this->filteredResponse($trust,'trusted_on_listing_create'); 85: return $this->filteredResponse($permission,'listing_allows_claims',$listing); 132: return $this->filteredResponse($permission,'listing_allows_inquiries',$listing); 150: return $this->filteredResponse($permission,'listing_allows_favorites',$listing); 173: return $this->filteredResponse($permission,'listing_allows_user_reviews',$listing); 191: return $this->filteredResponse($permission,'listing_allows_editor_reviews',$listing); 207: return $this->filteredResponse($permission,'listing_user_reviews_opened',$listing); 223: return $this->filteredResponse($permission,'listing_editor_reviews_opened',$listing); 251: $permission = $this->filteredResponse($permission,'can_create_listing',[$listingTypeId]); 278: return $this->filteredResponse($permission,'can_update_listing',$listing); 296: return $this->filteredResponse($permission,'can_add_listing_metadata',$listingType); 312: return $this->filteredResponse($permission,'can_use_editor_in_listing',[]); 334: return $this->filteredResponse($permission,'can_publish_listing',$listing); 356: return $this->filteredResponse($permission,'can_delete_listing',$listing); 374: return $this->filteredResponse($permission,'can_claim_listing',$listing); 390: return $this->filteredResponse($permission,'can_send_listing_inquiry',$listing); 406: return $this->filteredResponse($permission,'can_favorite_listing',$listing); 420: return $this->filteredResponse($permission,'can_feature_listing',[]); 496: return $this->filteredResponse($permission,'can_create_user_review_for_listing',$listing,$this->getMessage()); 546: return $this->filteredResponse($permission,'can_create_editor_review_for_listing',$listing,$this->getMessage()); 564: return $this->filteredResponse($permission,'can_add_review_on_listing_create',$listingType); 586: return $this->filteredResponse($permission,'can_update_listing_media',[$listing,$listingType]); 624: return $this->filteredResponse($permission,'can_upload_listing_media',[$listing,$listingType]); 644: return $this->filteredResponse($permission,'can_upload_media_from_url_in_listing',$listing); 662: return $this->filteredResponse($permission,'can_upload_listing_photo',[$listing,$listingType]); 680: return $this->filteredResponse($permission,'can_upload_listing_video'); 698: return $this->filteredResponse($permission,'can_upload_listing_audio',[$listing,$listingType]); 716: return $this->filteredResponse($permission,'can_upload_listing_attachment',[$listing,$listingType]);
Media Permissions
30: return $this->filteredResponse($trust,'trusted_on_create_photo'); 49: return $this->filteredResponse($trust,'trusted_on_create_video'); 68: return $this->filteredResponse($trust,'trusted_on_create_audio'); 87: return $this->filteredResponse($trust,'trusted_on_create_attachment'); 105: return $this->filteredResponse($permission,'media_allows_voting',$listing); 121: return $this->filteredResponse($permission,'media_allows_report',$listing); 149: return $this->filteredResponse($permission,'can_update_media_in_listing',[$listing,$media]); 177: return $this->filteredResponse($permission,'can_delete_media_in_listing',[$listing,$media]); 205: return $this->filteredResponse($permission,'can_publish_media_in_listing',[$listing,$media]); 237: return $this->filteredResponse($permission,'can_set_main_media',[$listing,$media]); 259: return $this->filteredResponse($permission,'can_update_media_details',[$listing,$media]); 286: return $this->filteredResponse($permission,'can_vote_on_media',[$listing,$media]); 302: return $this->filteredResponse($permission,'can_report_media',$listing); 323: return $this->filteredResponse($permission,'can_download_attachment',$media);
Review Permissions
28: return $this->filteredResponse($trust,'trusted_on_user_review_create'); 45: return $this->filteredResponse($trust,'trusted_on_user_review_update'); 58: return $this->filteredResponse($trust,'trusted_on_editor_review_create'); 71: return $this->filteredResponse($trust,'trusted_on_editor_review_update'); 84: return $this->filteredResponse($trust,'trusted_on_create_review_owner_reply'); 104: return $this->filteredResponse($permission,'review_allows_report',$review); 124: return $this->filteredResponse($permission,'review_allows_voting',$review); 140: return $this->filteredResponse($permission,'review_allows_replies',$review); 156: return $this->filteredResponse($permission,'review_allows_discussions',$review); 180: return $this->filteredResponse($permission,'can_update_review',$review); 204: return $this->filteredResponse($permission,'can_reply_to_review',[$listing,$review]); 220: return $this->filteredResponse($permission,'can_delete_review_reply',$listing); 236: return $this->filteredResponse($permission,'can_report_review',$review); 261: return $this->filteredResponse($permission,'can_vote_on_review',$review); 279: return $this->filteredResponse($permission,'can_create_review_post',$review); 319: return $this->filteredResponse($permission,'can_upload_review_media',$review); 337: return $this->filteredResponse($permission,'can_upload_media_from_url_in_review',$review); 353: return $this->filteredResponse($permission,'can_upload_review_photo',$review); 369: return $this->filteredResponse($permission,'can_upload_review_video',$review); 385: return $this->filteredResponse($permission,'can_upload_review_audio',$review); 401: return $this->filteredResponse($permission,'can_upload_review_attachment',$review);
Review Discussion Permissions
26: return $this->filteredResponse($trust,'trusted_on_create_review_discussion'); 48: return $this->filteredResponse($permission,'review_discussion_allows_report',$post); 64: return $this->filteredResponse($permission,'can_report_review_discussion',$post); 86: return $this->filteredResponse($permission,'can_update_review_discussion',[$post,$review]); 108: return $this->filteredResponse($permission,'can_delete_review_discussion',[$post,$review]);
Field Permissions
59: return $this->filteredResponse($permission,'can_view_field_in_'.$location.'_page',$field); 87: return $this->filteredResponse($permission,'can_read_field',[$fname]); 115: return $this->filteredResponse($permission,'can_write_field',[$fname]);