Search by year Jet Smart Filters

search-by-year-jet-smart-filters.php

<?php

/* Search by year Jet Smart Filters */

/* I want to share this code that allows you to search by year on Jet Smart Filters. */

// 1. Create a meta field named 'example-date', which is type date saved as timestamp.

// 2. Set a query on query builder that will fetch all the years of a meta field (in this case, meta field is named example-date, created on step 1).

/* Add a query with this SQL (Advanced) on Query builder
SELECT year, label
FROM (
    SELECT 'all' AS year, 'All' AS label
    UNION ALL
    SELECT DISTINCT YEAR(FROM_UNIXTIME(meta_value)) AS year, YEAR(FROM_UNIXTIME(meta_value)) AS label
    FROM wp_postmeta
    WHERE meta_key = 'example-date'
) AS combined_results
ORDER BY 
    CASE 
        WHEN year = 'all' THEN 0
        ELSE 1
    END, 
    year DESC;
*/


// 3. Using a Code Snippets plugin (or in functions.php of your child theme), I add this code to process filtering by year.

/* JetSmartFilters Filter by year */
add_filter( 'jet-smart-filters/query/meta-query-row', function( $row ) {
    if ( false !== strpos( $row['key'], 'by_years__' ) ) {
        $args = explode( '__', $row['key'] );

        if ( count( $args ) < 2 ) {
            return $row;
        }

        $meta_key = $args[1];
        $year = $row['value']; // Selected year from filter

        if ( $year === 'all' ) {
            // If the value is 'all', return the row without modifying the date filter
            return $row;
        }

        $row['key'] = $meta_key;
        $row['compare'] = 'BETWEEN';
        $row['type'] = 'NUMERIC';
        $row['value'] = array(
            strtotime("{$year}-01-01 00:00:00"),
            strtotime("{$year}-12-31 23:59:59"),
        );
    }
    return $row;
}, 10, 1);
/* END JetSmartFilters Filter by year */

// 4. Then create a radio filter, put 'label' as label and 'year' as value. On Data Source put JetEngine Query Builder (with the query you've just created), on "Use default filter" put 'all', "Equals comparison" and, most importantly, Query Variable should be "by_years__example-date" (change example-date to the meta field date you created on step one).

// 5. At last, on your frontend, place a radio filter, configure it as you normally do and it should be working right away.