Sample code to download file from internet - Phonegap Wiki

## phonegap_download_example.html
<!DOCTYPE html>
<html>
  <head>
  <title></title>

<!-- Android
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no;" />
<meta charset="utf-8">-->

<!-- iPad/iPhone specific css below, add after your main css >
<link rel="stylesheet" media="only screen and (max-device-width: 1024px)" href="/ipad.css" type="text/css" />
<link rel="stylesheet" media="only screen and (max-device-width: 480px)" href="/iphone.css" type="text/css" />
-->
<!-- If your application is targeting iOS BEFORE 4.0 you MUST put json2.js from http://www.JSON.org/json2.js into your www directory and include it here -->
<script type="text/javascript" charset="utf-8" src="phonegap-1.4.1.js"></script>
    <script type="text/javascript">


// If you want to prevent dragging, uncomment this section
/*
function preventBehavior(e)
{
      e.preventDefault();
    };
document.addEventListener("touchmove", preventBehavior, false);
*/

/* If you are supporting your own protocol, the var invokeString will contain any arguments to the app launch.
see http://iphonedevelopertips.com/cocoa/launching-your-own-application-via-a-custom-url-scheme.html
for more details -jm */
/*
function handleOpenURL(url)
{
// TODO: do something with the url passed in.
}
*/

function onBodyLoad()
{
document.addEventListener("deviceready", onDeviceReady, false);
}

    function downloadFile(){
        window.requestFileSystem(
                     LocalFileSystem.PERSISTENT, 0,
                     function onFileSystemSuccess(fileSystem) {
                     fileSystem.root.getFile(
                                 "dummy.html", {create: true, exclusive: false},
                                 function gotFileEntry(fileEntry){
                                 var sPath = fileEntry.fullPath.replace("dummy.html","");
                                 var fileTransfer = new FileTransfer();
                                 fileEntry.remove();

                                 fileTransfer.download(
                                           "http://www.w3.org/2011/web-apps-ws/papers/Nitobi.pdf",
                                           sPath + "theFile.pdf",
                                           function(theFile) {
                                           console.log("download complete: " + theFile.toURI());
                                           showLink(theFile.toURI());
                                           },
                                           function(error) {
                                           console.log("download error source " + error.source);
                                           console.log("download error target " + error.target);
                                           console.log("upload error code: " + error.code);
                                           }
                                           );
                                 },
                                 fail);
                     },
                     fail);

    }

    function showLink(url){
        alert(url);
        var divEl = document.getElementById("ready");
        var aElem = document.createElement("a");
        aElem.setAttribute("target", "_blank");
        aElem.setAttribute("href", url);
        aElem.appendChild(document.createTextNode("Ready! Click To Open."))
        divEl.appendChild(aElem);

    }


    function fail(evt) {
        console.log(evt.target.error.code);
    }

/* When this function is called, PhoneGap has been initialized and is ready to roll */
/* If you are supporting your own protocol, the var invokeString will contain any arguments to the app launch.
see http://iphonedevelopertips.com/cocoa/launching-your-own-application-via-a-custom-url-scheme.html
for more details -jm */
function onDeviceReady()
{
// do your thing!
        downloadFile();
}

    </script>
  </head>
  <body onload="onBodyLoad()">
<h1>Hey, it's PhoneGap!</h1>
<p>Don't know how to get started? Check out <em><a target="_blank" href="/http://www.phonegap.com/start">PhoneGap Start</a><em>
</p>
<br />
    <p>
        DOWNLOADING FILE...<br />
        <span id="ready"></span>
    </p>
  </body>
</html>