Google Map is not loading for the first time

javascript jquery google-maps jquery-mobile google-maps-api-3

22,128

Solution 1

Problems

First of all, why are you using jQuery Mobile? I don't see the point in your current example.

In this case jQuery Mobile is the main problem. Because jQuery Mobile is used everything will be loaded into the DOM. When you "navigate from the previous page" page is not refreshed and this line:

google.maps.event.addDomListener(window, 'load', initialize);

can't trigger. It will trigger only if you manually refresh the page.

Second thing, you cant use jQuery Mobile page events without having any page what so ever. In your code you have this part:

$(document).delegate('#content', 'pageinit', function () {
    navigator.geolocation.getCurrentPosition(initialize);
});

For it to initialize successfully div with an id content MUST have another attribute called data-role="page", like this:

<div id="content" data-role="page">

</div>

Third thing. Lets assume everything else is ok. Pageinit will not trigger from the HEAD. When jQuery Mobile loads pages it loads them into the DOM and only BODY part will be loaded. So for your map to work you need to move our javascript to the BODY (including a css). In you first example it didnt worked because you were triggering page even on a non-page div container.

And last thing, if you want to use jQuery Mobile properly you will need to take care correct version of jQuery is used with a correct version of jQuery Mobile. If you want to be safe use jQ 1.8.3 with jQM 1.2

Solution

Here's a working solution:

<!DOCTYPE html>
<html>
    <head>
        <title>jQM Complex Demo</title>
        <meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; minimum-scale=1.0; user-scalable=no; target-densityDpi=device-dpi"/>
        <link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
        <script src="http://www.dragan-gaic.info/js/jquery-1.8.2.min.js"></script>          
        <script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>                  
    </head>
    <body>
        <style>
            #map-canvas {
                width: 300px;
                height: 300px;
            }
        </style>            
        <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>       
        <script type="text/javascript">
            function initialize() {     
                var myLatlng = new google.maps.LatLng(33.89342, -84.30715);

                var mapOptions = {
                  zoom: 10,
                  center: myLatlng,
                  mapTypeId: google.maps.MapTypeId.ROADMAP
                };

                var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

                var marker = new google.maps.Marker({
                    position: myLatlng,
                    map: map,
                    title: 'Location'
                });
            }

            //google.maps.event.addDomListener(window, 'load', initialize);
            
            $(document).on('pageshow', '#wrapper', function(e, data){       
                initialize();
            });             
        </script>   
        <div id="wrapper" data-role="page">
            <div class="header">
                <h3>Test</h3>
                <a href="index.html"><img src="images/logo-small.png" alt="logo"/></a>
            </div>
            <div id="content">
                <div id="map-canvas"></div>
            </div>
        </div>  
    </body>
</html>

Working examples and much more information regarding this topic can be found in this ARTICLE.

Solution 2

just add: data-ajax="false" to the link tag which redirects to the page that contains your map. for example, if map.aspx contains your map, you can link to it like this:

<a href="map.aspx" data-ajax="false">

Solution 3

I have also same problem with google.maps.event.addDomListener(window, 'load', initialize); where initialize is my method . I just add few line of code before google.maps.event.addDomListener(window, 'load', initialize);

Code is

 $(document).ready( function () {
        initialize();
    });

and this code is working for me

Solution 4

I was having same problem but I have no any jquery-mobile libraray or any other which would conflict the map. Struggling a hard time, I found a solution for my project:

Doesn't work:

<script src="http://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY" async defer>
</script>

Works (Removing async and defer attributes):

<script src="http://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>

Hope! This helps someone if the other solutions doesn't work. Try this only if none of other solution work because it is not good suggestion as we know google page speed guide or google map api guide says to use it.

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22,128

Author by

Chrishan

Experienced Android Developer. Please find my profile at LinkedIn

Updated on December 10, 2020

Comments

Chrishan over 3 years

I am using Google Maps JavaScript API to load map inside my mobile website. When I navigate from the previous page map won't load but if I refresh the page map load as expected. If I use the JavaScript inside the body even the page is not loading. I can't figure out the problem. Is it something with the previous page code ?

Here is my code in Head tag.

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1"> 
<link rel="stylesheet" type="text/css" href="css/jquery.mobile-1.1.0.min.css" />  
<link href="css/site.css" rel="stylesheet" type="text/css" />
<script src="./js/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.js"></script>
<script type="text/javascript" 
src="http://maps.googleapis.com/maps/api/js?key=xxxxxxxx&sensor=false">
</script>
        <script type="text/javascript">
            function initialize() {
                var myLatlng = new google.maps.LatLng(<?php echo $longtitude ?>, <?php echo $latitude ?>);

                var mapOptions = {
                  zoom: 10,
                  center: myLatlng,
                  mapTypeId: google.maps.MapTypeId.ROADMAP
                };

                var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

                var marker = new google.maps.Marker({
                    position: myLatlng,
                    map: map,
                    title: 'Location'
                });
            }
             google.maps.event.addDomListener(window, 'load', initialize);

             $(document).delegate('#content', 'pageinit', function () {
               navigator.geolocation.getCurrentPosition(initialize);
                });
        </script>
</head>

Here is my Body Tag

<body >
    <div id="wrapper">
        <div class="header">
            <a href="index.html"><img src="images/logo-small.png" alt="logo"/></a>
        </div>
        <div class="back">
        <a data-rel="back"><img src="images/back.png"/></a>
    </div> 
        <div id="content">
            <div class="list">
                <div class="list-items" id="info">
                    <?php echo "<h3>$sa1<span>$postcode<span>$sa2</span></span></h3><h2>$price</h2>";?>
                <br class="clear" />
                <br class="clear" />
                </div>
            </div>
            <br class="clear" />
        <div id="map-canvas">
        </div>
    </div>
    </div>
</body>

I refer question This and This but it's not working with my code.

Gajotres about 11 years

This will never work. pageload event will work ONLY if pageload function is used to load an external page into the DOM.
jakobhans about 11 years

I was under the impression that all pages are loaded into jQueryMobile's DOM as some kind of "external" page. Since in the question there are no <div data-role="page"> I took for granted that this was outside the first page.
Gajotres about 11 years

You are correct but pageload will trigger only if $.mobile.loadPage function is used to load the page. And I don't think he went that far.
Chrishan about 11 years

Still not working for me. We used your code completely but still it takes the css styles from the previous page and not loading the map at all. But when we refreshed map loads without any external styling as you have mentioned in the code.
Gajotres about 11 years

Can you add an alert into a pageshow event? This will tell us if event was successfully trigered.
Chrishan about 11 years

yes copied all and paste it in a new file. but the new file still get the CSS styles of previous page. I think it inherits from the previous page.