Enter some whitespaces (more then minLength)

[kotmatpockuh]

Enter some whitespaces (more then minLength) - as result all posts are fetched. This is bad behaviour, we must trim our input, and call ajax query only if minLength is reached with character, not with whitespace.

[kotmatpockuh]

in .php you need something like:

                               if (strlen($term) > 0){
                    relevanssi_do_query( $query );
                    $tempPosts = $query->posts;
                }
            } else {
                $tempPosts = array();
                if (strlen($term) > 0){
                    $tempPosts = get_posts( array(
                        'suppress_filters' => false,
                        's'                => $term,
                        'numberposts'      => $this->options['autocomplete_numrows'],
                        'post_type'        => $this->options['autocomplete_posttypes'],
                    ) );
                }

and in .js:

action: 'autocompleteCallback',
                        term: this.term.trim()