FlashFileDownloader.js

/*
 * FileDownloader
 */

var FileDownloader = {};
FileDownloader.misc = {};

FileDownloader.flashPath = 'flash-file-downloader/FlashFileDownloader.swf';
FileDownloader.flashContainer = 'flashContainer';
FileDownloader.lastResult = undefined;

FileDownloader.networkReady = true;
FileDownloader.JSReady = false;
FileDownloader.ready = false;

FileDownloader.download = function(url, callback) {
    if (! FileDownloader.ready || ! FileDownloader.misc.getMovie("FlashFileDownloader").download) { 
        return setTimeout(function() { FileDownloader.download(url, callback); }, 500);
    }

    FileDownloader.ready = false;

    if (! FileDownloader.misc.isFlashAvailable()) {
        FileDownloader.misc.log("Sorry, we need Flash to proceed");
    }

    FileDownloader._url = url;
    FileDownloader._download(FileDownloader._url, callback);
}

/******************************************************************************/
// Misc. utility functions

FileDownloader_isJavaScriptReady = function() {
    return FileDownloader.JSReady;
}

FileDownloader.misc.quietEmbedSWF = function(path, containerId) {
    var swfName = FileDownloader.misc.fileBasename(path);

    FileDownloader.misc.addInvisibleElement(swfName, containerId);
    var containerEl = document.getElementById(containerId);
    var width = parseInt(getComputedStyle(containerEl).width);
    var height = parseInt(getComputedStyle(containerEl).height);

    var params = { allowScriptAccess : "always", name : swfName, wmode : "transparent" };
    var flashvars = false;
    var attributes = { name : swfName};

    swfobject.embedSWF(path, swfName, "" + width, "" + height, "10.0.0",
        "expressInstall.swf", flashvars, params, attributes);
}

FileDownloader.misc.addInvisibleElement = function(id, containerEl) {
    var container = document.getElementById(containerEl) || containerEl || document.body;

    if (!container) {
        return setTimeout(function() { FileDownloader.misc.addInvisibleElement(id, containerEl); }, 500);
    }

    if (document.getElementById(id)) {
        return false;
    }

    var elementType = 'div';

    var innerContainer = document.getElementById('file_downloader_container');
    if (!innerContainer) {
        innerContainer = document.createElement('div');
        innerContainer.id = 'file_downloader_container';
        innerContainer.style.display = 'none';
        container.appendChild(innerContainer);
    }
    // var innerContainer = document.getElementById('file_downloader_container');

    var el = document.createElement(elementType);
    el.id = id;
    el.style.display = 'none';
    container.appendChild(el);

    return true;
}

FileDownloader.misc.fileBasename = function(path) {
    var s = path.replace(/.*\//, '').replace(/.swf/i, '');
    return s;
}

FileDownloader.misc.getMovie = function(movieName) { 
 
    if (navigator.appName.indexOf("Microsoft") != -1) { 
        return window[movieName];
    } else { 
        return document[movieName]; 
    } 
} 

FileDownloader.misc.handleResult = function(resultObj) {

    FileDownloader.lastResult = resultObj;

    // Clear queue of other methods if 
    if (!resultObj.error()) {
        FileDownloader.ready = true;
        
        // Execute user function on object here
        if (FileDownloader._handler) {
            FileDownloader._handler(resultObj);
        }
    } else {
        // nothing worked, return last result
        FileDownloader.ready = true;

        // Execute user function on object here
        if (FileDownloader._handler) {
            FileDownloader._handler(resultObj);
        }
    }
}

// This function gets called from ActionScript after the download is finished
FileDownloader.misc.sendToJavaScript = function(params) {

    FileDownloader.networkReady = true;

    result = new FileDownloader.result(params);
    FileDownloader.misc.handleResult(result);
}

FileDownloader.misc.sendTimestampToFlash = function () {
    var timestamp = new Date().getTime() + "";
    FileDownloader.misc.getMovie("FlashFileDownloader").uploadTimestamp(timestamp);
}

FileDownloader.misc.getTime = function() {
    return (new Date()).getTime();
}

FileDownloader.misc.sendToActionScript = function(command) {
    if (!FileDownloader.networkReady) {
        return setTimeout(function() { FileDownloader.misc.sendToActionScript(command)}, 500);
    }
    
    FileDownloader.networkReady = false;
    FileDownloader.misc.getMovie("FlashFileDownloader").sendToActionScript(command);
}

FileDownloader.misc.isFlashAvailable = function() {
    if (navigator.mimeTypes && navigator.mimeTypes["application/x-shockwave-flash"])
        return true;
    else if (FileDownloader.isFlashReady())
        return true;
    else if (window.ActiveXObject) {
        for (x = 7; x <= 11; x++) {
            try {
                oFlash = eval("new ActiveXObject('ShockwaveFlash.ShockwaveFlash." + x + "');");
                if (oFlash) {
                    return true;
                }
            }
            catch(e) { }
        }
    }
    else
        return false;
}

FileDownloader.misc.addOnloadEvent = function(newEvent) {
    var originalEvent = window.onload;

    if (typeof window.onload != 'function') {
        window.onload = newEvent;
    } else {
        window.onload = function() {
            if (originalEvent) { originalEvent(); }
            newEvent();
        }
    }
}

FileDownloader.misc.onloadActions = function () {
    FileDownloader.networkReady = true;
    FileDownloader.JSReady = true;
    FileDownloader.ready = true;
    
    FileDownloader.misc.quietEmbedSWF(FileDownloader.flashPath, FileDownloader.flashContainer);
}

FileDownloader.misc.log = function() {
    if (typeof(console) != "undefined" && console.log)
        console.log(arguments);
}

FileDownloader.isFlashReady = function() {
    var m = FileDownloader.misc.getMovie("FlashFileDownloader");
    return m && m.sendToActionScript;
}

FileDownloader._download = function (url, callback) {
    // Callbacks implemented: success, failure, progress
    if (!callback) {
        callback = {}
    } 

    var defaultHandler = FileDownloader.misc.log;
    FileDownloader.progressHandler = callback.progress || defaultHandler;
    FileDownloader.successHandler = callback.success || defaultHandler;
    FileDownloader.failureHandler = callback.failureHandler || defaultHandler;

    console.log(FileDownloader.misc.getMovie("FlashFileDownloader").download);

    FileDownloader.misc.getMovie("FlashFileDownloader").download(url);
    FileDownloader.misc.getMovie("FlashFileDownloader").addCallback('progress', 'FileDownloader.progressHandler');
    FileDownloader.misc.getMovie("FlashFileDownloader").addCallback('success', 'FileDownloader.successHandler');
    FileDownloader.misc.getMovie("FlashFileDownloader").addCallback('failure', 'FileDownloader.failureHandler') ;
}

/* Create our container element */
document.write('<div id="file_downloader_container"></div>');
FileDownloader.misc.addOnloadEvent(FileDownloader.misc.onloadActions);