How to Max Length CustomField result to 100

Hi,

Well, the only way to do that is via custom coding, instead of using the advanced field, as there is no parameter to control that.

I constructed a custom code for you, which should help with that. Try adding it to functions.php in your theme/child theme directory. Before editing, please make sure to have a full site back-up just in case!

Change the $custom_field and $length variables according to your needs.

add_filter( 'asp_results', 'asp_c_field_to_desc', 10, 1 );
function asp_c_field_to_desc( $results ) {
	$custom_field = "field_name";
	$length = 100;
	
	// ------ DO NOT CHANGE BELOW ----------
	foreach ($results as $k=>&$r) {
		if ($r->content_type != "pagepost") continue;
		if ( function_exists('get_field') )
		  $meta_value = get_field( $custom_field, $id, true ); // ACF support
		else
		  $meta_value = get_post_meta( $id, $custom_field, true );
		// Modify the post title to add the meta value
		if ( !empty($meta_value) ) {
			$r->content .= wd_substr_at_word($meta_value, $length);
		}
	}
  
	return $results;
}

Sorry, I was not able to test before posting. Now I did, and there was indeed an error in the code. This one will work:

add_filter( 'asp_results', 'asp_c_field_to_desc', 10, 1 );
function asp_c_field_to_desc( $results ) {
    $custom_field = "my_custom_field";
    $length = 100;

    // ------ DO NOT CHANGE BELOW ----------
    foreach ($results as $k=>&$r) {
        if ($r->content_type != "pagepost") continue;
        if ( function_exists('get_field') )
            $meta_value = get_field( $custom_field, $r->id, true ); // ACF support
        else
            $meta_value = get_post_meta( $r->id, $custom_field, true );
        // Modify the post title to add the meta value
        if ( !empty($meta_value) ) {
            $meta_value = wd_array_to_string($meta_value);
            $r->content .= wd_substr_at_word($meta_value, $length);
        }
    }

    return $results;
}

Don’t add the {my_custom_field} variable to the advanced description field, the code automatically appends it to the end of it.

Actually, I may have found a much better solution. Instead of the previous code, you can use the one below. With that, you can use the advanced description field as before, it will automatically change the maximum length of all field values to 100:

add_filter('asp_cpt_advanced_field_value', 'change_asp_cpt_advanced_field_value', 10, 2);
function change_asp_cpt_advanced_field_value($value, $field_name) {
    $length = 100;
    return wd_substr_at_word($value, $length);
}

Actually, I think so, maybe this variation:

add_filter('asp_cpt_advanced_field_value', 'change_asp_cpt_advanced_field_value', 10, 2);
function change_asp_cpt_advanced_field_value($value, $field_name) {
        // Each line 'field_name' => length
        $fields_length = array(
		'custom_field_2' => 100,
		'custom_field_3' => 200
	);
	
	if ( isset($fields_length[$field_name]) ) {
		return wd_substr_at_word($value, $fields_length[$field_name]);
	} else {
		return $value;
	}
}