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    <p>It's actually pretty simple. The above example from Dive into HTML is incomplete, as it doesn't show the show_map function, which is a user-created function that actually reads the incoming data and does something with it. Here's a more complete example:</p> <pre><code>&lt;!DOCTYPE HTML&gt; &lt;html lang = "en"&gt; &lt;head&gt; &lt;title&gt;location.html&lt;/title&gt; &lt;meta charset = "UTF-8" /&gt; &lt;script type = "text/javascript"&gt; //&lt;![CDATA[ function getLoc(){ navigator.geolocation.getCurrentPosition(showMap); } // end getLoc function showMap(position){ var lat = position.coords.latitude; var long = position.coords.longitude; var linkUrl = "http://maps.google.com?q=" + lat + "," + long; var mapLink = document.getElementById("mapLink"); mapLink.href = linkUrl; var embedMap = document.getElementById("embedMap"); embedMap.src = linkUrl + "&amp;z=16&amp;amp;output=embed"; } // end showMap //]]&gt; &lt;/script&gt; &lt;/head&gt; &lt;body onload = "getLoc()"&gt; &lt;h1&gt;Geolocation Demo&lt;/h1&gt; &lt;p&gt; &lt;a id = "mapLink" href = "http://maps.google.com"&gt;click for a map&lt;/a&gt; &lt;/p&gt; &lt;iframe id = "embedMap" width="800" height="500" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src= ""&gt; &lt;/iframe&gt;&lt;br /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>This example (from my upcoming HTML5 book) has a getLoc() function called by the body onload mechanism. This uses the navigator.geolocation.getCurrentPosition() function to request a permission vector. It will pop up a permission dialog, which will be rejected if the user chooses not to share her current position. If the user does play along, the indicated callback function (in my case showMap) will be displayed. </p> <p>The callback function automatically accepts a special position object as its only parameter. This object has a number of potentially useful attributes, but latitude and longitude are the most helpful. You can use these values to simply print out the current position. You can also concatenate these values into a Google maps URL to get a quick Google map of the current location. I also embedded a Google map into my current page, and changed the URL of the embedded (iframe) map to get immediate feedback.</p> <p>Hope this helps!</p>
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    1. POgeolocation in google map and HTML5
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    1. USTwo pi
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    1. COThe point that still missing is, the technology behind geolocation in HTML5. If I do not (want to) use google map or google service, how will I incorporate this geolocation service in my own server? Is the Database for IP-geolocation universal? Or, specific company based service?
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      1. USMorison
    2. CO@Morison the way that HTML5 specifies that geolocation works is that you request the user's location from their browser. The browser then supplies it however it can. In the case of firefox, it sends information on nearby wireless access points to Google and then sends the results back to the website that requested it. For Mobile Safari and Android, it can use the device's GPS and cell information. Once you have the location, you can do whatever you want with it - you don't need to display a google map, you could for example customise your content for the location, or display a map from Bing.
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      1. USColin Pickard
 

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