zobrazení google mapy po rozkryti divu jquery

function new_map( $el ) {
    // var
    var $markers = $el.find('.marker');
    // vars
    var args = {
        zoom        : 16,
        center        : new google.maps.LatLng(0, 0),
        mapTypeId    : google.maps.MapTypeId.ROADMAP,
        scrollwheel: false
    };
        
    // create map                
    var map = new google.maps.Map( $el[0], args);
    
    // add a markers reference
    map.markers = [];
    // add markers
    $markers.each(function(){
        add_marker( $(this), map );
    });
    // center map
    center_map( map );
    // return
    return map;    
}
/*
*  add_marker
*
*  This function will add a marker to the selected Google Map
*
*  @type    function
*  @date    8/11/2013
*  @since    4.3.0
*
*  @param    $marker (jQuery element)
*  @param    map (Google Map object)
*  @return    n/a
*/
function add_marker( $marker, map ) {
    // var
    var latlng = new google.maps.LatLng( $marker.attr('data-lat'), $marker.attr('data-lng') );
    // create marker
    var marker = new google.maps.Marker({
        position    : latlng,
        map            : map
    });
    // add to array
    map.markers.push( marker );
    // if marker contains HTML, add it to an infoWindow
    if( $marker.html() )
    {
        // create info window
        var infowindow = new google.maps.InfoWindow({
            content        : $marker.html()
        });
        // show info window when marker is clicked
        google.maps.event.addListener(marker, 'click', function() {
            infowindow.open( map, marker );
    });
    }
}

/*
*  center_map
*
*  This function will center the map, showing all markers attached to this map
*
*  @type    function
*  @date    8/11/2013
*  @since    4.3.0
*
*  @param    map (Google Map object)
*  @return    n/a
*/

function center_map( map ) {

    // vars
    var bounds = new google.maps.LatLngBounds();

    // loop through all markers and create bounds
    $.each( map.markers, function( i, marker ){

        var latlng = new google.maps.LatLng( marker.position.lat(), marker.position.lng() );

        bounds.extend( latlng );

    });

    // only 1 marker?
    if( map.markers.length == 1 )
    {
        // set center of map
        map.setCenter( bounds.getCenter() );
        map.setZoom( 16 );
    }
    else
    {
        // fit to bounds
        map.fitBounds( bounds );
    }

}

/*
*  document ready
*
*  This function will render each map when the document is ready (page has loaded)
*
*  @type    function
*  @date    8/11/2013
*  @since    5.0.0
*
*  @param    n/a
*  @return    n/a
*/
// global var
var map = null;

$(document).ready(function(){

    $('.acf-map').each(function(){

        // create map
        map = new_map( $(this) );

    });

});

$( ".mapa" ).click(function() {
  $( '.acf-map' ).delay( 500 ).fadeIn( 500 );
  google.maps.event.trigger(map, "resize");
  
});