Title: Post filter Last modified: November 2, 2018 --- # Post filter * [valery2016](https://wordpress.org/support/users/valery2016/) * (@valery2016) * [7 years, 7 months ago](https://wordpress.org/support/topic/post-filter-2/) * Hi All! I am not a native speaker of English, sorry. * How to organize Records filtering by metabox field values? I created a custom post. Custom taxonomy allows you to get the archives of posts related to a specific term. I want in each archive I receive (for each taxonomy term) to organize a filter of the displayed Posts by the values of the metabox fields. * For ex.: [image](https://res.cloudinary.com/valery/image/upload/v1541137933/customArchive_w2tzjl.jpg) This is an archive page – taxonomy-term-one.php. * Is it possible? * Thanks! * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fpost-filter-2%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 5 replies - 1 through 5 (of 5 total) * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [7 years, 7 months ago](https://wordpress.org/support/topic/post-filter-2/#post-10841987) * Yes! The filter you want is actually an action. They are closely related, but you interact with the passed data differently. The action is called “[pre_get_posts](https://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts)” and your callback is passed the current WP_Query class object by reference. ALL post queries pass through this action, so you need to be sure you are affecting the right objects. A couple things to check is `$query->is_main_query()` and `! $query->is_admin()`, and perhaps `$query->is_archive()`, plus anything else, such as the post type and your taxonomy exist as query vars gotten with `$query- >get()`. I’m assuming your callback collects the passed object with `$query`. * Once you are sure you are changing the correct query, set query var (with `$query- >set()`) “orderby” to “meta_value” and set “meta_key” to your meta value’s key name. For good measure, set “order” to “ASC” since the default is “DESC”. * [Howdy_McGee](https://wordpress.org/support/users/howdy_mcgee/) * (@howdy_mcgee) * [7 years, 7 months ago](https://wordpress.org/support/topic/post-filter-2/#post-10841991) * You can use the `pre_get_posts` action hook ([Codex](https://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts), [Developer Resources](https://developer.wordpress.org/reference/hooks/pre_get_posts/)) * An example would be: * ``` /** * Modify the post query before it gets requested * * @param WP_Query $query * * @return void */ function wpf10840294_modify_query( $query ) { // Prevent running this on admin ( optional ) if( is_admin() ) { return; } // IF the query is the main loop on the page ( not a secondary WP_Query ) if( $query->is_main_query() { /** * IF we're currently viewing a taxonomy archive page * AND the viewed taxonomy is "taxonomy" and the viewed term is "term-slug" * * if you only want this to run on one term, * you would replcae "term-slug" with the slug of the term you would run it on * and the "taxonmy" with the taxonomy the term belongs to. * * if you want it to apply to all terms of the taxonomy, remove the 2nd parameter * and replace "taxonomy" with the desired taxonomy. */ if( $query->is_tax() && $query->is_tax( 'taxonomy', 'term-slug' ) { /** * Query the meta value by key name * * @see https://codex.wordpress.org/Class_Reference/WP_Query#Custom_Field_Parameters */ $query->set( 'meta_key', 'meta_key_name' ); /** * Order by the meta value * if the value is a numeric value use "meta_value_num" * * @see https://codex.wordpress.org/Class_Reference/WP_Query#Order_.26_Orderby_Parameters */ $query->set( 'orderby' => array( 'meta_value' => 'ASC' ) ); } } } add_action( 'pre_get_posts', 'wpf10840294_modify_query' ); ``` * One catch is that every post needs to have the meta key or it will be excluded from the query. The above code could go in a child themes `functions.php` file or a plugin file. * Let me know if you have any further questions! * Thread Starter [valery2016](https://wordpress.org/support/users/valery2016/) * (@valery2016) * [7 years, 7 months ago](https://wordpress.org/support/topic/post-filter-2/#post-10842125) * **bcworkz**, **Howdy_McGee** * Thank you so much!!! * I will now try to implement what I have planned… On the results (or lack thereof) I will inform you * Thanks! * Thread Starter [valery2016](https://wordpress.org/support/users/valery2016/) * (@valery2016) * [7 years, 7 months ago](https://wordpress.org/support/topic/post-filter-2/#post-10854250) * Hi All! The hook works great. I figured it out. * Now I just don’t understand how to create “controls” (filtering by color in the image in the starting post). So far I have created a form in which, when selecting a checkbox (color – green, for example), the line `/?option-color=green` is added to the URL. This is static. How to get all the values of all metabox fields dynamically( in WordPress) I do not know. In general, I need help … * If there is any tutorials on this topic, please share the link. Thanks! * Sorry for Google English 🙂 - This reply was modified 7 years, 7 months ago by [valery2016](https://wordpress.org/support/users/valery2016/). * [Howdy_McGee](https://wordpress.org/support/users/howdy_mcgee/) * (@howdy_mcgee) * [7 years, 7 months ago](https://wordpress.org/support/topic/post-filter-2/#post-10857241) * In your `pre_get_posts` hook you can look for `$_GET['option-color']` which will be whatever `option-color` equals in the url. In this case: * `$color = $_GET['option-color'] // green` `$query->set( 'meta_value', $color);` Viewing 5 replies - 1 through 5 (of 5 total) The topic ‘Post filter’ is closed to new replies. ## Tags * [filter](https://wordpress.org/support/topic-tag/filter/) * [metabox](https://wordpress.org/support/topic-tag/metabox/) * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/) * 5 replies * 3 participants * Last reply from: [Howdy_McGee](https://wordpress.org/support/users/howdy_mcgee/) * Last activity: [7 years, 7 months ago](https://wordpress.org/support/topic/post-filter-2/#post-10857241) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics