gistfile1.js

(function($) {
 
/*
*  render_map
*
*  This function will render a Google Map onto the selected jQuery element
*
*  @type	function
*  @date	8/11/2013
*  @since	4.3.0
*
*  @param	$el (jQuery element)
*  @return	n/a
*/
 
function render_map( $el ) {
 
	// var
	var $markers = $el.find('.marker');
 
	// vars
	var args = {
		zoom		: 16,
		center		: new google.maps.LatLng(0, 0),
		scrollwheel: false,
		mapTypeId	: google.maps.MapTypeId.ROADMAP
	};
 
	// create map	        	
	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 );
 
}
 
/*
*  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') );
	
	var currentDomain = window.location.protocol + "//" + window.location.host + "/";
	
	// 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( 10 );
	}
	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
*/
 
$(document).ready(function(){
 
	$('.acf-map').each(function(){
 
		render_map( $(this) );
 
	});
	
	 $(function () {
        $('#footer').on('shown.bs.tab', function(e) {
            lastCenter=map.getCenter();
            google.maps.event.trigger(map, 'resize');
            map.setCenter(lastCenter);
        });
    });
    
	$(function () {
    	$('#footer').on('shown.bs.collapse', function() {
			lastCenter=map.getCenter();
            google.maps.event.trigger(map, 'resize');
            map.setCenter(lastCenter);
		});
	});

});
 
})(jQuery);

I'm still having trouble with this... I have 3 tabs, but only first and last will show their maps. I don't know what's the problem.