Force datepicker to be open on page load

<?php
// this code goes in your theme's functions.php file
// http://www.gravityhelp.com/forums/topic/display-the-calendar-in-the-opened-state#post-150402
// only enqueue the script when form 328 is being embedded
// change 328 here to your form's ID
add_action('gform_enqueue_scripts_328', 'enqueue_open_datepicker', 10, 2);
function enqueue_open_datepicker($form, $is_ajax) {
    // enqueue the script to open the datepicker.  Script is stored in the child theme /js/ subdirectory,
    // and depends on jQuery and the jQuery UI Datepicker script
    wp_enqueue_script('open_datepicker', get_stylesheet_directory_uri() . '/js/datepicker-open.js', array('jquery','jquery-ui-datepicker'));
}

// this code goes in to a file called datepicker-open.js in a folder inside your theme folder, called js
// this will force all datepicker open on load.  You can use different selectors here if you want to
// instead of .gform_wrapper and input
jQuery(document).ready(function($) {
    $( "body .gform_wrapper input.datepicker" ).datepicker( "show" );
});