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jquery-file-upload
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postmessage.html

<!DOCTYPE HTML>
<!--
/*
 * jQuery File Upload Plugin postMessage API
 * https://github.com/blueimp/jQuery-File-Upload
 *
 * Copyright 2011, Sebastian Tschan
 * https://blueimp.net
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 */
-->
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery File Upload Plugin postMessage API</title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
</head>
<body>
<script>
/*jslint unparam: true, regexp: true */
/*global $, Blob, FormData, location */
'use strict';
var origin = /^http:\/\/example.org/,
    target = new RegExp('^(http(s)?:)?\\/\\/' + location.host + '\\/');
$(window).on('message', function (e) {
    e = e.originalEvent;
    var s = e.data,
        xhr = $.ajaxSettings.xhr(),
        f;
    if (!origin.test(e.origin)) {
        throw new Error('Origin "' + e.origin + '" does not match ' + origin);
    }
    if (!target.test(e.data.url)) {
        throw new Error('Target "' + e.data.url + '" does not match ' + target);
    }
    $(xhr.upload).on('progress', function (ev) {
        ev = ev.originalEvent;
        e.source.postMessage({
            id: s.id,
            type: ev.type,
            timeStamp: ev.timeStamp,
            lengthComputable: ev.lengthComputable,
            loaded: ev.loaded,
            total: ev.total
        }, e.origin);
    });
    s.xhr = function () {
        return xhr;
    };
    if (!(s.data instanceof Blob)) {
        f = new FormData();
        $.each(s.data, function (i, v) {
            f.append(v.name, v.value);
        });
        s.data = f;
    }
    $.ajax(s).always(function (result, statusText, jqXHR) {
        if (!jqXHR.done) {
            jqXHR = result;
            result = null;
        }
        e.source.postMessage({
            id: s.id,
            status: jqXHR.status,
            statusText: statusText,
            result: result,
            headers: jqXHR.getAllResponseHeaders()
        }, e.origin);
    });
});
</script>
</body>
</html>