How to Find Longitude & Latitude of Geolocation in PhoneGap

Deepak Dwij
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Article

Introduction

In this article we are going to have a very interesting session with a PhoneGapPhoto application. In this application we will find the different geo locations with a PhoneGap Application.

Let's see how to get a latitude and longitude of Geolocation with PhoneGap.

Step 1 : Open Visual Studio 2010

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Step 2 : Open File menu -select new - Choose Project then.

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Step 3 : Select the new phone application and rename it according to your requirement.

Step 4 : After opening up the source code, replace the code with the given code for the index.html file:

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Scripting for getting User interface

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, maximum-scale=1.0, user-scalable=no;" />
    <meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
    <title>PhoneGap WP7</title>
       <link rel="stylesheet" href="master.css" type="text/css" media="screen" title="no title" charset="utf-8"/>
      <script type="text/javascript" charset="utf-8" src="phonegap-1.3.0.js"></script>
      <script type="text/javascript">
          // provide our own console if it does not exist ,huge dev aid'
          if (typeof window.console == "Undefined") {
              window.console = { log: function (str) { window.external.Notify(str); } };
          }
          // output any errors to console log ,created above'
          window.onerror = function (e) {
              console.log("window.onError::" + JSON.stringify(e));
          };
          console.log("Installed console !");
      </script>
      <script type="text/javascript" charset="uft-8" src="photo.js"></script>
</head>
<body>
    <h1> Photo Location</h1>
      <div>
       <input id="loadImageButton" type="button" value="Select Photo" onclick="selectPhoto(false);" />
      <input id="TakePictureButton" type="button" value="Take Photo" onclick="selectPhoto(true);" />
     </div>
      <div>
      <img id="imageControl" alt="" />
    </div>
<div>
    <span>Current Location : </span>
    <ul>
     <li> Latitude : <span id="latSpan"></span></li>
     <li> Longitude:<span id="lonSpan"></span></li>
    </ul>
    </div>
</body>
</html>

Designing

Step 5 : Code for the Master.css file.

body
{
    background:#000 none repeat scroll 0 0;
    color:#ccc;
    font-family:Helvetica, Verdana, Geneva, sans-serif;
    margin:0;
    border-top:1px solid #393939;
}
h1
{
     text-align:center;
     font-size:18px;
    color:#FFC312; /* Mango me! */
}
input[tpye=button]
{
      background-color:#000;
      border:4px Solid #fff;
      padding:4px;
      color:#fff;
}
div input[type=button]:nth-child(n+2)
{
      margin-left:6px;
}
#imageControl
{
      margin-top:80px;
      margin-left:10px;
     width:300px;
     height:300px;
     }

Step 6 : In this section we use JavaScript for various functionality for the PhoneGapPhoto application. To create a new main.js file, go to www then right-click - add new items then select Text file and rename to main.js.

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Scripting for getting info using JavaScript

Put the given JavaScript in the photo.js file.

    /* js file the operations */

var pictureSource;
var destinationType;
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
    pictureSource = navigator.camera.PictureSourceType;
    destinationType = navigator.camera.DestinationType;
    getCurrentLocation();
}
function selectPhoto(useCamera) {
    if (useCamera) { // take picture
        navigator.camera.getPicture(photoLoaded, onError, { allowEdit: true, destinationType: destinationType.FILE_URI });
    }
    else {
        // select from library
        navigator.camera.getPicture(photoLoaded, onError, { allowEdit: true, sourceType: pictureSource.PHOTOLIBRARY, destinationType: destinationType.FILE_URI });
    }
}
function photoLoaded(imageData) {
    var image = document.getElementById("imageControl");
    image.src = imageData;
}
function onError(message) {
     navigator.notification.alert(message, "", "Error");
}
function getCurrentLocation() {
     navigator.geolocation.getCurrentPosition(locationSuccess, onError);
}
function locationSuccess(position) {
    var lat = document.getElementById("latSpan");
    var lon = document.getElementById("lonSpan");
    lat.innerText = position.coords.latitude;
    lon.innerText = position.coords.longitude;
}

Step 7 : Output Pres F5

Additional Tools window:

Getting latitude and longitude for the New Delhi location.

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Getting latitude and longitude for the Palwal location.

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Getting latitude and longitude for the Aligarh location.

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Getting latitude and longitude for the Varanasi location.

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