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HTML

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Fetch Tiles into PPouchDB</title>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" ></script>
    <script src="http://cdn.kendostatic.com/2013.1.514/js/kendo.all.min.js"></script>
    <script src="https://googledrive.com/host/0B2Ay-nw1QSW2SHhjR0VBZXE2bUU/PouchTest/xhr2lib.js"></script>
    <script src="https://googledrive.com/host/0B2Ay-nw1QSW2SHhjR0VBZXE2bUU/PouchTest/pouchdb-nightly.js"></script>
    <link href="http://cdn.kendostatic.com/2013.1.514/styles/kendo.common.min.css" rel="stylesheet" />
    <link href="http://cdn.kendostatic.com/2013.1.514/styles/kendo.metroblack.min.css" rel="stylesheet" />
    <link href="http://cdn.kendostatic.com/2013.1.514/styles/kendo.dataviz.metroblack.min.css" rel="stylesheet" />
</head>

<body>
    <div id="deleteDB" class="shadow k-button ">Delete Database</div>
    <div class="gap">&nbsp;</div>
    <div id="downloadButton" class="k-button shadow ">Download Tiles</div>
    <div class="gap">&nbsp;</div>
    <div class="CSSTableGenerator">
        <table>
            <tr>
                <td>Item
                </td>
                <td>Value
                </td>
            </tr>
            <tr>
                <td>Status
                </td>
                <td data-bind="text: status">xxx
                </td>
            </tr>
            <tr>
                <td>XHR2 Support
                </td>
                <td data-bind="text: xhr">xxx
                </td>
            </tr>
            <tr>
                <td>Base64 blobs
                </td>
                <td data-bind="text: b64Flag">xxx
                </td>
            </tr>
            <tr>
                <td>DB Manifest
                </td>
                <td data-bind="text: dbManifest">xxx
                </td>
            </tr>
            <tr>
                <td>Tile Count
                </td>
                <td data-bind="text: tileCount">xxx
                </td>
            </tr>
            <tr>
                <td>Start Time
                </td>
                <td data-bind="text: startTime">xxx
                </td>
            </tr>
            <tr>
                <td>Fetch Time
                </td>
                <td data-bind="text: fetchTime">xxx
                </td>
            </tr>
            <tr>
                <td>Blob Count
                </td>
                <td data-bind="text: blobCount">xxx
                </td>
            </tr>
            <tr>
                <td>Total Time
                </td>
                <td data-bind="text: totalTime">xxx
                </td>
            </tr>
                        <tr>
                <td>Blobs/sec
                </td>
                <td data-bind="text: blobRate">xxx
                </td>
            </tr>
        </table>
    </div>
    <h1>Sample Image Fetched From PouchDB</h1>
    <div class="gap">&nbsp;</div>
    <div id="imgBox">
        <img id="imgTile" alt="MAP not loaded YET">
    </div>
</body>
</html>

              
            
!

CSS

              
                html
{
    font: 14px "Verdana", "Helvetica", sans-serif;
    margin-left: 8px;
    height: 100%;
    background-image: linear-gradient(bottom, rgb(83,181,217) 17%, rgb(147,208,219) 59%);
    background-image: -o-linear-gradient(bottom, rgb(83,181,217) 17%, rgb(147,208,219) 59%);
    background-image: -moz-linear-gradient(bottom, rgb(83,181,217) 17%, rgb(147,208,219) 59%);
    background-image: -webkit-linear-gradient(bottom, rgb(83,181,217) 17%, rgb(147,208,219) 59%);
    background-image: -ms-linear-gradient(bottom, rgb(83,181,217) 17%, rgb(147,208,219) 59%);
    background-image: -webkit-gradient( linear, left bottom, left top, color-stop(0.17, rgb(83,181,217)), color-stop(0.59, rgb(147,208,219)) );
}

body {
  height: 100%;
  wdith: 100%;
}


.gap
{
    display: block;
    height: 10px;
}

.shadow
{
    box-shadow: 0 1px 7px rgba(0, 0, 0, 0.65);
}

#imgBox
{
    padding: 4px;
    width: 256px;
    height: 256px;
    box-shadow: 0 1px 7px rgba(0, 0, 0, 0.65);
}

#imgTile
{
    width: 100%;
    height: 100%;
}

.CSSTableGenerator
{
    margin: 0px;
    padding: 0px;
    width: 80%;
    box-shadow: 0 1px 7px rgba(0, 0, 0, 0.65);
    border: 1px solid #000000;
    -moz-border-radius-bottomleft: 0px;
    -webkit-border-bottom-left-radius: 0px;
    border-bottom-left-radius: 0px;
    -moz-border-radius-bottomright: 0px;
    -webkit-border-bottom-right-radius: 0px;
    border-bottom-right-radius: 0px;
    -moz-border-radius-topright: 0px;
    -webkit-border-top-right-radius: 0px;
    border-top-right-radius: 0px;
    -moz-border-radius-topleft: 0px;
    -webkit-border-top-left-radius: 0px;
    border-top-left-radius: 0px;
}

    .CSSTableGenerator table
    {
        width: 100%;
        height: 100%;
        margin: 0px;
        padding: 0px;
    }

    .CSSTableGenerator tr:last-child td:last-child
    {
        -moz-border-radius-bottomright: 0px;
        -webkit-border-bottom-right-radius: 0px;
        border-bottom-right-radius: 0px;
    }

    .CSSTableGenerator table tr:first-child td:first-child
    {
        -moz-border-radius-topleft: 0px;
        -webkit-border-top-left-radius: 0px;
        border-top-left-radius: 0px;
    }

    .CSSTableGenerator table tr:first-child td:last-child
    {
        -moz-border-radius-topright: 0px;
        -webkit-border-top-right-radius: 0px;
        border-top-right-radius: 0px;
    }

    .CSSTableGenerator tr:last-child td:first-child
    {
        -moz-border-radius-bottomleft: 0px;
        -webkit-border-bottom-left-radius: 0px;
        border-bottom-left-radius: 0px;
    }

    .CSSTableGenerator tr:hover td
    {
    }

    .CSSTableGenerator tr:nth-child(odd)
    {
        background-color: #aad4ff;
    }

    .CSSTableGenerator tr:nth-child(even)
    {
        background-color: #ffffff;
    }

    .CSSTableGenerator td
    {
        vertical-align: middle;
        border: 1px solid #000000;
        border-width: 0px 1px 1px 0px;
        text-align: left;
        padding: 8px;
        font-size: 14px;
        font-family: Verdana;
        font-weight: normal;
        color: #000000;
    }

    .CSSTableGenerator tr:last-child td
    {
        border-width: 0px 1px 0px 0px;
    }

    .CSSTableGenerator tr td:last-child
    {
        border-width: 0px 0px 1px 0px;
    }

    .CSSTableGenerator tr:last-child td:last-child
    {
        border-width: 0px 0px 0px 0px;
    }

    .CSSTableGenerator tr:first-child td
    {
        background: -o-linear-gradient(bottom, #005fbf 5%, #003f7f 100%);
        background: -webkit-gradient( linear, left top, left bottom, color-stop(0.05, #005fbf), color-stop(1, #003f7f) );
        background: -moz-linear-gradient( center top, #005fbf 5%, #003f7f 100% );
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#005fbf", endColorstr="#003f7f");
        background: -o-linear-gradient(top,#005fbf,003f7f);
        background-color: #005fbf;
        border: 0px solid #000000;
        text-align: center;
        border-width: 0px 0px 1px 1px;
        font-size: 16px;
        font-family: Verdana;
        font-weight: bold;
        color: #ffffff;
    }

    .CSSTableGenerator tr:first-child:hover td
    {
        background: -o-linear-gradient(bottom, #005fbf 5%, #003f7f 100%);
        background: -webkit-gradient( linear, left top, left bottom, color-stop(0.05, #005fbf), color-stop(1, #003f7f) );
        background: -moz-linear-gradient( center top, #005fbf 5%, #003f7f 100% );
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#005fbf", endColorstr="#003f7f");
        background: -o-linear-gradient(top,#005fbf,003f7f);
        background-color: #005fbf;
    }

    .CSSTableGenerator tr:first-child td:first-child
    {
        border-width: 0px 0px 1px 0px;
    }

    .CSSTableGenerator tr:first-child td:last-child
    {
        border-width: 0px 0px 1px 1px;
    }

1px 1px;
}

              
            
!

JS

              
                var baseURL = "https://googledrive.com/host/0B2Ay-nw1QSW2SHhjR0VBZXE2bUU/TinyBlueMarble/";

var DBNAME = "MapTiles";
var DB = null;
var manifest = null;
var vm = null;
var showID = "4-9-6";
var fetchCnt = 0;
var imageType = "jpg";
var maxTiles = 999999;

window.indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
if (!window.indexedDB) {
    window.alert("Your browser doesn't support a stable version of IndexedDB.");
}

// executed when all js and css is loaded (i.e. document ready event)
$(function () {
    makeVM();
    vm.set("status", "Initializing");
    testXHR();
    testBase64();
    openDB();
    setup();
});

function makeVM() {
    vm = kendo.observable({
        status: "",
        xhr: false,
        b64Flag: false,
        dbManifest: false,
        tileCount: 0,
        startTime: "",
        fetchTime: "0",
        blobCount: 0,
        totalTime: "0",
        blobRate: 0
    });
    kendo.bind(document.body, vm);
}

function testXHR() {
    vm.set("xhr", $xhr.supported());
}

function testBase64() {
    var b64Flag = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
    vm.set("b64Flag", b64Flag);
}

function setup() {
    $("#deleteDB").click(deleteDB);
    $("#downloadButton").click(download);
    $xhr.defaultError(function (text, code) {
        console.error("xhr2 error: ", text, " code: ", code, " url: ", this.xhr2data.url);
    });
}

function openDB() {
    DB = Pouch(DBNAME);
    DB.get("MANIFEST", function (err, doc) {
        if (err) {
            console.error("Manifest fetch error: ", err.error, " reason: ", err.reason, " status: ", err.status);
            manifest = null;
            vm.set("dbManifest", false);
            getManifest();
        } else {
            manifest = doc.data;
            vm.set("dbManifest", true);
            vm.set("tileCount", manifest.files.length);
            vm.set("status", "Ready");
        }
    });
}

function deleteDB() {
    Pouch.destroy(DBNAME, function (err, info) {
        if (err) {
            console.error("Could not Delete DB: ", info);
        } else {
            console.log("db deleted");
            vm.set("dbManifest", false);
        }
    });
    manifest = null;
    vm.set("tileCount", 0);
    vm.set("status", "Reload");
}

function getManifest() {
    $xhr.ajax({
        url: baseURL + "manifest.json",
        dataType: "json",
        success: parseManifest
    });
}

function parseManifest(data) {
    data.files = data.files.slice(0, maxTiles - 1);
    manifest = data;
    DB.put({ _id: "MANIFEST", data: data }, function (err, response) {
        if (err) {
            console.error("Could store MANIFEST: error: " + err.error + " reason: " + err.reason + " status: " + err.status);
        } else {
            console.log("saved: ", response.id + " rev: " + response.rev);
            vm.set("dbManifest", true);
        }
    });
    vm.set("tileCount", manifest.files.length);
    vm.set("status", "Ready");
}

function download() {
    if (manifest == null) {
        alert("No Manifest, reload");
        return;
    }
    fetchCnt = 0;
    vm.set("blobCount", 0);
    vm.set("startTime", new Date());
    vm.set("fetchTime", "0");
    getBlobs(manifest.files);
}

function getBlobs(fileList) {
    console.log("starting to fetch blobs");
    $.each(fileList, function (i, val) {
        var path = baseURL + val.id + "." + imageType;
        $xhr.ajax({
            url: path,
            dataType: "blob",
            success: function (data) { saveBlob(data, val.size, val.id); }
        });
    });
}

function saveBlob(blob, length, id) {
    if (blob.size != length) {
        console.error("Blob Length found: ", blob.size, " expected: ", length);
    }
    putBlob(blob, id);
    ++fetchCnt;
    if (fetchCnt == manifest.files.length) {
        setTimeout(fetchComplete, 0);
    }
}

function fetchComplete() {
    var startTime = vm.get("startTime");
    var elapsed = new Date() - startTime;
    var fetchTime = ms2Time(elapsed);
    vm.set("fetchTime", fetchTime);
    console.log("Done Fetching Tiles");
}

function putBlob(blob, id) {
    var cnt;
    var type = blob.type;
    DB.putAttachment(id + "/pic", blob, type, function (err, response) {
        if (err) {
            console.error("Could store blob: error: " + err.error + " reason: " + err.reason + " status: " + err.status);
        } else {
            console.log("saved: ", response.id + " rev: " + response.rev);
            cnt = vm.get("blobCount");
            vm.set("blobCount", ++cnt);
            if (cnt == manifest.files.length) {
                setTimeout(storeComplete, 0);
            }
        }
    });
}

function storeComplete() {
    console.log("Done Storing Tiles");
    var startTime = vm.get("startTime");
    var elapsed = new Date() - startTime;
    var totalTime = ms2Time(elapsed);
    vm.set("totalTime", totalTime);
    var rate = manifest.files.length * 1000 / elapsed;
    vm.set("blobRate", rate);
    setImage();
}

function setImage() {
    var id = showID;
    var blob;
    DB.getAttachment(id + "/pic", function (err, response) {
        if (err) {
            console.error("Could find blob id: ", id, " error: ", err.error, " reason: ", err.reason, " status: ", err.status);
        } else {
            blob = response;
            var imgURL = URL.createObjectURL(blob);
            // Set img src to ObjectURL
            $("#imgTile").attr("src", imgURL);
            // Revoking ObjectURL
            URL.revokeObjectURL(imgURL);
        }
    });
}

function ms2Time(ms) {
    var secs = ms / 1000;
    ms = Math.floor(ms % 1000);
    var minutes = secs / 60;
    secs = Math.floor(secs % 60);
    var hours = minutes / 60;
    minutes = Math.floor(minutes % 60);
    hours = Math.floor(hours % 24);
    return hours + ":" + minutes + ":" + secs + "." + ms;
}
              
            
!
999px

Console