Drop Down Search

gf_drop_down_search.php

add_action("gform_pre_render", "set_chosen_options");
function set_chosen_options($form){
    ?>
    <script type="text/javascript">
    gform.addFilter('gform_chosen_options', 'set_chosen_options_js');
    function set_chosen_options_js(options, element){
        options.search_contains = true;
        return options;
    }
</script>
    <?php
    //return the form object from the php hook
    return $form;
}