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<?php

add_filter( 'jet-engine/listings/allowed-callbacks', 'jet_add_trim_callback', 10, 2 );

function jet_add_trim_callback( $callbacks ) {
	$callbacks['jet_trim_string'] = 'Trim string';
	return $callbacks;
}

function jet_trim_string( $string ) {

MjHead

.chess-listing .jet-listing-grid__item:nth-child(even) .chess-col-1 {
    order: 2;
}

.chess-listing .jet-listing-grid__item:nth-child(even) .chess-col-2 {
    order: 1;
}

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<?php
/**
 * Testimonials start template
 */
$settings = $this->get_settings();
$data_settings = $this->generate_setting_json();

$use_comment_corner = $this->get_settings( 'use_comment_corner' );

$class_array[] = 'jet-testimonials__instance';

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<?php

add_filter( 'jet-engine/listings/allowed-callbacks', 'jet_add_calc_callback', 10, 2 );
function jet_add_calc_callback( $callbacks ) {
	$callbacks['jet_calc_fileds'] = 'Calculated field example';
	return $callbacks;
}

function jet_calc_fileds( $field_1_value ) {
	return $field_1_value * get_post_meta( get_the_ID(), 'field_2' );

MjHead

<?php
add_filter( 'jet-engine/listings/allowed-callbacks', 'jet_he_add_calc_callback', 10, 2 );
function jet_he_add_calc_callback( $callbacks ) {
	$callbacks['jet_he_calc_fileds']             = 'Calculated total price';
	$callbacks['jet_he_calc_fileds_no_discount'] = 'Calculated total price (without discount)';
	return $callbacks;
}

function jet_he_calc_fileds( $field_1_value ) {
	$license_fee = absint( get_post_meta( get_the_ID(), 'license-fee', true ) );

MjHead

<?php

add_filter( 'jet-abaf/db/additional-db-columns', function( $columns ) {
	$columns = array(
		'user_email',
		'order_id'
	);
	return $columns;
} );

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<?php

/**
 * Add "Get thumb and title from related" callback into available callbacks list
 */
function jet_add_rel_callback( $callbacks ) {
	$callbacks['jet_rel_thumb_callback'] = 'Get thumb and title from related';
	return $callbacks;
}

MjHead

<?php

add_filter( 'jet-engine/listing/grid/posts-query-args', 'je_custom_listing_order', 10, 2 );

/**
 * Add multiple order by paramters to listing grid widget.
 *
 * What you need t replace:
 * - speakers_list - replace this with your custom ID added to Listing widget
 * - is-featured, speaker-name - meta fields names we need to sort by.

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add_filter( 'register_post_type_args', 'je_change_post_type_rewrite_slug', 10, 2 );

/**
 * Change post type rewirte
 * Where:
 * - apartments  - is a post type slug. Replace is with your actual slug.
 * - %locations% - is a placeholder for taxonomy term in URL.
 *
 * @param  array  $args
 * @param  string $post_type_name

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<?php
/**
 * Method 1
 * Can be used for: Any storage type
 *
 * page-slug - replace this with your Option Page slug
 * option-name - replace this with your option Name/ID
 */
$value = jet_engine()->listings->data->get_option( 'page-slug::option-name' );