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View File Name : SimpleAjaxUploader.js

/**
 * Simple Ajax Uploader
 * Version 2.0
 * https://github.com/LPology/Simple-Ajax-Uploader
 *
 * Copyright 2012-2015 LPology, LLC
 * Released under the MIT license
 */

;(function( window, document, undefined ) {

    var ss = window.ss || {},

        // ss.trim()
        rLWhitespace = /^\s+/,
        rTWhitespace = /\s+$/,

        // ss.getUID
        uidReplace = /[xy]/g,

        // ss.getFilename()
        rPath = /.*(\/|\\)/,

        // ss.getExt()
        rExt = /.*[.]/,

        // ss.hasClass()
        rHasClass = /[\t\r\n]/g,

        // Check for Safari -- it doesn't like multi file uploading. At all.
        // http://stackoverflow.com/a/9851769/1091949
        isSafari = Object.prototype.toString.call( window.HTMLElement ).indexOf( 'Constructor' ) > 0,

        isIE7 = ( navigator.userAgent.indexOf('MSIE 7') !== -1 ),

        // Check whether XHR uploads are supported
        input = document.createElement( 'input' ),

        XhrOk;

    input.type = 'file';

    XhrOk = ( 'multiple' in input &&
              typeof File !== 'undefined' &&
              typeof ( new XMLHttpRequest() ).upload !== 'undefined' );


/**
* Converts object to query string
*/
ss.obj2string = function( obj, prefix ) {
    "use strict";

    var str = [];

    for ( var prop in obj ) {
        if ( obj.hasOwnProperty( prop ) ) {
            var k = prefix ? prefix + '[' + prop + ']' : prop, v = obj[prop];
            str.push( typeof v === 'object' ?
                        ss.obj2string( v, k ) :
                        encodeURIComponent( k ) + '=' + encodeURIComponent( v ) );
        }
    }

    return str.join( '&' );
};

/**
* Copies all missing properties from second object to first object
*/
ss.extendObj = function( first, second ) {
    "use strict";

    for ( var prop in second ) {
        if ( second.hasOwnProperty( prop ) ) {
            first[prop] = second[prop];
        }
    }
};

ss.addEvent = function( elem, type, fn ) {
    "use strict";

    if ( elem.addEventListener ) {
        elem.addEventListener( type, fn, false );

    } else {
        elem.attachEvent( 'on' + type, fn );
    }
    return function() {
        ss.removeEvent( elem, type, fn );
    };
};

ss.removeEvent = function( elem, type, fn ) {
    "use strict";

    if ( elem.removeEventListener ) {
        elem.removeEventListener( type, fn, false );

    } else {
        elem.detachEvent( 'on' + type, fn );
    }
};

ss.newXHR = function() {
    "use strict";

    if ( typeof XMLHttpRequest !== 'undefined' ) {
        return new window.XMLHttpRequest();

    } else if ( window.ActiveXObject ) {
        try {
            return new window.ActiveXObject( 'Microsoft.XMLHTTP' );
        } catch ( err ) {
            return false;
        }
    }
};

ss.getIFrame = function() {
    "use strict";

    var id = ss.getUID(),
        iframe;

    // IE7 can only create an iframe this way, all others are the other way
    if ( isIE7 ) {
        iframe = document.createElement('<iframe src="javascript:false;" name="' + id + '">');

    } else {
        iframe = document.createElement('iframe');
        /*jshint scripturl:true*/
        iframe.src = 'javascript:false;';
        iframe.name = id;
    }

    iframe.style.display = 'none';
    iframe.id = id;
    return iframe;
};

ss.getForm = function( opts ) {
    "use strict";

    var form = document.createElement('form');

    form.encoding = 'multipart/form-data'; // IE
    form.enctype = 'multipart/form-data';
    form.style.display = 'none';

    for ( var prop in opts ) {
        if ( opts.hasOwnProperty( prop ) ) {
            form[prop] = opts[prop];
        }
    }

    return form;
};

ss.getHidden = function( name, value ) {
    "use strict";

    var input = document.createElement( 'input' );

    input.type = 'hidden';
    input.name = name;
    input.value = value;
    return input;
};

/**
* Parses a JSON string and returns a Javascript object
* Borrowed from www.jquery.com
*/
ss.parseJSON = function( data ) {
    "use strict";

    if ( !data ) {
        return false;
    }

    data = ss.trim( data + '' );

    if ( window.JSON && window.JSON.parse ) {
        try {
            // Support: Android 2.3
            // Workaround failure to string-cast null input
            return window.JSON.parse( data + '' );
        } catch ( err ) {
            return false;
        }
    }

    var rvalidtokens = /(,)|(\[|{)|(}|])|"(?:[^"\\\r\n]|\\["\\\/bfnrt]|\\u[\da-fA-F]{4})*"\s*:?|true|false|null|-?(?!0\d)\d+(?:\.\d+|)(?:[eE][+-]?\d+|)/g,
        depth = null,
        requireNonComma;

    // Guard against invalid (and possibly dangerous) input by ensuring that nothing remains
    // after removing valid tokens
    return data && !ss.trim( data.replace( rvalidtokens, function( token, comma, open, close ) {

        // Force termination if we see a misplaced comma
        if ( requireNonComma && comma ) {
            depth = 0;
        }

        // Perform no more replacements after returning to outermost depth
        if ( depth === 0 ) {
            return token;
        }

        // Commas must not follow "[", "{", or ","
        requireNonComma = open || comma;

        // Determine new depth
        // array/object open ("[" or "{"): depth += true - false (increment)
        // array/object close ("]" or "}"): depth += false - true (decrement)
        // other cases ("," or primitive): depth += true - true (numeric cast)
        depth += !close - !open;

        // Remove this token
        return '';
    }) ) ?
        ( Function( 'return ' + data ) )() :
        false;
};

ss.getBox = function( elem ) {
    "use strict";

    var box,
        docElem,
        top = 0,
        left = 0;

    if ( elem.getBoundingClientRect ) {
        box = elem.getBoundingClientRect();
        docElem = document.documentElement;
        top = box.top  + ( window.pageYOffset || docElem.scrollTop )  - ( docElem.clientTop  || 0 );
        left = box.left + ( window.pageXOffset || docElem.scrollLeft ) - ( docElem.clientLeft || 0 );

    } else {
        do {
            left += elem.offsetLeft;
            top += elem.offsetTop;
        } while ( ( elem = elem.offsetParent ) );
    }

    return {
        top: Math.round( top ),
        left: Math.round( left )
    };
};

/**
* Helper that takes object literal
* and add all properties to element.style
* @param {Element} el
* @param {Object} styles
*/
ss.addStyles = function( elem, styles ) {
    "use strict";

    for ( var name in styles ) {
        if ( styles.hasOwnProperty( name ) ) {
            elem.style[name] = styles[name];
        }
    }
};

/**
* Function places an absolutely positioned
* element on top of the specified element
* copying position and dimensions.
*/
ss.copyLayout = function( from, to ) {
    "use strict";

    var box = ss.getBox( from );

    ss.addStyles( to, {
        position: 'absolute',
        left : box.left + 'px',
        top : box.top + 'px',
        width : from.offsetWidth + 'px',
        height : from.offsetHeight + 'px'
    });
};

/**
* Generates unique ID
* Complies with RFC 4122 version 4
* http://stackoverflow.com/a/2117523/1091949
* ID begins with letter "a" to be safe for HTML elem ID/name attr (can't start w/ number)
*/
ss.getUID = function() {
    "use strict";

    /*jslint bitwise: true*/
    return 'axxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(uidReplace, function(c) {
        var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
        return v.toString(16);
    });
};

/**
* Removes white space from left and right of string
*/
ss.trim = function( text ) {
    "use strict";
    return text.toString().replace( rLWhitespace, '' ).replace( rTWhitespace, '' );
};

/**
* Extract file name from path
*/
ss.getFilename = function( path ) {
    "use strict";
    return path.replace( rPath, '' );
};

/**
* Get file extension
*/
ss.getExt = function( file ) {
    "use strict";
    return ( -1 !== file.indexOf( '.' ) ) ? file.replace( rExt, '' ) : '';
};

/**
* Check whether element has a particular CSS class
* Parts borrowed from www.jquery.com
*/
ss.hasClass = function( elem, name ) {
    "use strict";
    return ( ' ' + elem.className + ' ' ).replace( rHasClass, ' ' ).indexOf( ' ' + name + ' ' ) >= 0;
};

/**
* Adds CSS class to an element
*/
ss.addClass = function( elem, name ) {
    "use strict";

    if ( !name || name === '' ) {
        return false;
    }
    if ( !ss.hasClass( elem, name ) ) {
        elem.className += ' ' + name;
    }
};

/**
* Removes CSS class from an element
*/
ss.removeClass = (function() {
    "use strict";

    var c = {}; //cache regexps for performance

    return function( e, name ) {
        if ( !c[name] ) {
            c[name] = new RegExp('(?:^|\\s)' + name + '(?!\\S)');
        }
        e.className = e.className.replace( c[name], '' );
    };
})();

/**
* Nulls out event handlers to prevent memory leaks in IE6/IE7
* http://javascript.crockford.com/memory/leak.html
* @param {Element} d
* @return void
*/
ss.purge = function( d ) {
    "use strict";

    var a = d.attributes, i, l, n;

    if ( a ) {
        for ( i = a.length - 1; i >= 0; i -= 1 ) {
            n = a[i].name;

            if ( typeof d[n] === 'function' ) {
                d[n] = null;
            }
        }
    }

    a = d.childNodes;

    if ( a ) {
        l = a.length;
        for ( i = 0; i < l; i += 1 ) {
            ss.purge( d.childNodes[i] );
        }
    }
};

/**
* Removes element from the DOM
*/
ss.remove = function( elem ) {
    "use strict";

    if ( elem && elem.parentNode ) {
        // null out event handlers for IE
        ss.purge( elem );
        elem.parentNode.removeChild( elem );
    }
    elem = null;
};

/**
* Accepts either a jQuery object, a string containing an element ID, or an element,
* verifies that it exists, and returns the element.
* @param {Mixed} elem
* @return {Element}
*/
ss.verifyElem = function( elem ) {
    "use strict";

    if ( typeof jQuery !== 'undefined' && elem instanceof jQuery ) {
        elem = elem[0];

    } else if ( typeof elem === 'string' ) {
        if ( elem.charAt( 0 ) == '#' ) {
            elem = elem.substr( 1 );
        }
        elem = document.getElementById( elem );
    }

    if ( !elem || elem.nodeType !== 1 ) {
        return false;
    }

    if ( elem.nodeName.toUpperCase() == 'A' ) {
        elem.style.cursor = 'pointer';

        ss.addEvent( elem, 'click', function( e ) {
            if ( e && e.preventDefault ) {
                e.preventDefault();

            } else if ( window.event ) {
                window.event.returnValue = false;
            }
        });
    }

    return elem;
};

ss._options = {};

ss.uploadSetup = function( options ) {
    "use strict";
    ss.extendObj( ss._options, options );
};

ss.SimpleUpload = function( options ) {
    "use strict";

    var i,
        len,
        btn;

    this._opts = {
        button: '',
        url: '',
        dropzone: '',
        dragClass: '',
        cors: false,
        progressUrl: false,
        sessionProgressUrl: false,
        nginxProgressUrl: false,
        multiple: false,
        maxUploads: 3,
        queue: true,
        checkProgressInterval: 500,
        keyParamName: 'APC_UPLOAD_PROGRESS',
        sessionProgressName: 'PHP_SESSION_UPLOAD_PROGRESS',
        nginxProgressHeader: 'X-Progress-ID',
        corsInputName: 'XHR_CORS_TARGETORIGIN',
        allowedExtensions: [],
        accept: '',
        maxSize: false,
        name: '',
        data: {},
        noParams: false,
        autoSubmit: true,
        multipart: false,
        method: 'POST',
        responseType: '',
        debug: false,
        hoverClass: '',
        focusClass: '',
        disabledClass: '',
        customHeaders: {},
        onAbort: function( filename, uploadBtn ) {},
        onChange: function( filename, extension, uploadBtn, size ) {},
        onSubmit: function( filename, extension, uploadBtn, size ) {},
        onProgress: function( pct ) {},
        onUpdateFileSize: function( filesize ) {},
        onComplete: function( filename, response, uploadBtn ) {},
        onExtError: function( filename, extension ) {},
        onSizeError: function( filename, fileSize ) {},
        onError: function( filename, type, status, statusText, response, uploadBtn ) {},
        startXHR: function( filename, fileSize, uploadBtn ) {},
        endXHR: function( filename, fileSize, uploadBtn ) {},
        startNonXHR: function( filename, uploadBtn ) {},
        endNonXHR: function( filename, uploadBtn ) {}
    };

    // Include any setup options
    ss.extendObj( this._opts, ss._options );

    // Then add options for this instance
    ss.extendObj( this._opts, options );

    options = null;

    this._btns = [];

    // An array of buttons was passed
    if ( this._opts.button instanceof Array ) {
        len = this._opts.button.length;

        for ( i = 0; i < len; i++ ) {
            btn = ss.verifyElem( this._opts.button[i] );

            if ( btn !== false ) {
                this._btns.push( this.rerouteClicks( btn ) );

            } else {
                this.log( 'Button with array index ' + i + ' is invalid' );
            }
        }

    // A single button was passed
    } else {
        btn = ss.verifyElem( this._opts.button );

        if ( btn !== false ) {
            this._btns.push( this.rerouteClicks( btn ) );
        }
    }

    delete this._opts.button;

    // No valid elements were passed to button option
    if ( this._opts.dropzone === '' && ( this._btns.length < 1 || this._btns[0] === false ) ) {
        throw new Error( "Invalid button. Make sure the element you're passing exists." );
    }

    if ( this._opts.multiple === false ) {
        this._opts.maxUploads = 1;
    }

    // An array of objects, each containing two items, a file and a reference
    // to the button which triggered the upload: { file: uploadFile, btn: button }
    this._queue = [];

    this._active = 0;
    this._disabled = false; // if disabled, clicking on button won't do anything
    this._maxFails = 10; // max allowed failed progress updates requests in iframe mode
    this._progKeys = {}; // contains the currently active upload ID progress keys

    if ( !XhrOk ) {
        // Cache progress keys after we set sizeBox for fewer trips to the DOM
        this._sizeFlags = {};
    }

    if ( XhrOk && this._opts.dropzone !== '' ) {
        this.addDropZone( this._opts.dropzone );
    }

    this._createInput();

    this._manDisabled = false;
    this.enable( true );
};

ss.SimpleUpload.prototype = {

    destroy: function() {
        "use strict";

        // # of upload buttons
        var i = this._btns.length;

        // Put upload buttons back to the way we found them
        while ( i-- ) {
            // Remove event listener
            if ( this._btns[i].off ) {
                this._btns[i].off();
            }

            // Remove any lingering classes
            ss.removeClass( this._btns[i], this._opts.hoverClass );
            ss.removeClass( this._btns[i], this._opts.focusClass );
            ss.removeClass( this._btns[i], this._opts.disabledClass );

            // In case we disabled it
            this._btns[i].disabled = false;
        }

        // Remove div/file input combos from the DOM
        ss.remove( this._input.parentNode );

        // Now burn it all down
        for ( var prop in this ) {
            if ( this.hasOwnProperty( prop ) ) {
                delete this.prop;
            }
        }
    },

    /**
    * Send data to browser console if debug is set to true
    */
    log: function( str ) {
        "use strict";

        if ( this._opts.debug && window.console && window.console.log ) {
            window.console.log( '[Uploader] ' + str );
        }
    },

    /**
    * Replaces user data
    * Note that all previously set data is entirely removed and replaced
    */
    setData: function( data ) {
        "use strict";
        this._opts.data = data;
    },

    /**
    * Set or change uploader options
    * @param {Object} options
    */
    setOptions: function( options ) {
        "use strict";
        ss.extendObj( this._opts, options );
    },

    /**
    * Designate an element as a progress bar
    * The CSS width % of the element will be updated as the upload progresses
    */
    setProgressBar: function( elem ) {
        "use strict";
        this._progBar = ss.verifyElem( elem );
    },

    /**
    * Designate an element to receive a string containing progress % during upload
    * Note: Uses innerHTML, so any existing child elements will be wiped out
    */
    setPctBox: function( elem ) {
        "use strict";
        this._pctBox = ss.verifyElem( elem );
    },

    /**
    * Designate an element to receive a string containing file size at start of upload
    * Note: Uses innerHTML, so any existing child elements will be wiped out
    */
    setFileSizeBox: function( elem ) {
        "use strict";
        this._sizeBox = ss.verifyElem( elem );
    },

    /**
    * Designate an element to be removed from DOM when upload is completed
    * Useful for removing progress bar, file size, etc. after upload
    */
    setProgressContainer: function( elem ) {
        "use strict";
        this._progBox = ss.verifyElem( elem );
    },

    /**
    * Designate an element to serve as the upload abort button
    */
    setAbortBtn: function( elem, remove ) {
        "use strict";

        this._abortBtn = ss.verifyElem( elem );
        this._removeAbort = false;

        if ( remove ) {
            this._removeAbort = true;
        }
    },

    /**
    * Returns number of files currently in queue
    */
    getQueueSize: function() {
        "use strict";
        return this._queue.length;
    },

    /**
    * Enables uploader and submits next file for upload
    */
    _cycleQueue: function() {
        "use strict";

        if ( this._queue.length > 0 && this._opts.autoSubmit ) {
            this.submit();
        }
    },

    /**
    * Remove current file from upload queue, reset props, cycle to next upload
    */
    removeCurrent: function( id ) {
        "use strict";

        if ( id ) {
            var i = this._queue.length;

            while ( i-- ) {
                if ( this._queue[i].id === id ) {
                    this._queue.splice( i, 1 );
                    break;
                }
            }

        } else {
            this._queue.splice( 0, 1 );
        }

        this._cycleQueue();
    },

    /**
    * Clears Queue so only most recent select file is uploaded
    */
    clearQueue: function() {
        "use strict";
        this._queue.length = 0;
    },

    /**
    * Disables upload functionality
    */
    disable: function( _self ) {
        "use strict";

        var i = this._btns.length,
            nodeName;

        // _self is always true when disable() is called internally
        this._manDisabled = !_self || this._manDisabled === true ? true : false;
        this._disabled = true;

        while ( i-- ) {
            nodeName = this._btns[i].nodeName.toUpperCase();

            if ( nodeName == 'INPUT' || nodeName == 'BUTTON' ) {
                this._btns[i].disabled = true;
            }

            if ( this._opts.disabledClass !== '' ) {
                ss.addClass( this._btns[i], this._opts.disabledClass );
            }
        }

        // Hide file input
        if ( this._input && this._input.parentNode ) {
            this._input.parentNode.style.visibility = 'hidden';
        }
    },

    /**
    * Enables upload functionality
    */
    enable: function( _self ) {
        "use strict";

        // _self will always be true when enable() is called internally
        if ( !_self ) {
            this._manDisabled = false;
        }

        // Don't enable uploader if it was manually disabled
        if ( this._manDisabled === true ) {
            return;
        }

        var i = this._btns.length;

        this._disabled = false;

        while ( i-- ) {
            ss.removeClass( this._btns[i], this._opts.disabledClass );
            this._btns[i].disabled = false;
        }
    }

};

ss.IframeUpload = {

    /**
    * Accepts a URI string and returns the hostname
    */
    _getHost: function( uri ) {
        var a = document.createElement( 'a' );

        a.href = uri;

        if ( a.hostname ) {
            return a.hostname.toLowerCase();
        }
        return uri;
    },

    _addFiles: function( file ) {
        var filename = ss.getFilename( file.value ),
            ext = ss.getExt( filename );

        if ( false === this._opts.onChange.call( this, filename, ext, this._overBtn ) ) {
            return false;
        }

        this._queue.push({
            id: ss.getUID(),
            file: file,
            name: filename,
            ext: ext,
            btn: this._overBtn,
            size: null
        });

        return true;
    },

    /**
    * Handles uploading with iFrame
    */
    _uploadIframe: function( fileObj, progBox, sizeBox, progBar, pctBox, abortBtn, removeAbort ) {
        "use strict";

        var self = this,
            opts = this._opts,
            key = ss.getUID(),
            iframe = ss.getIFrame(),
            form,
            url,
            msgLoaded = false,
            iframeLoaded = false,
            removeMessageListener,
            removeLoadListener,
            cancel;

        if ( opts.noParams === true ) {
            url = opts.url;

        } else {
            // If we're using Nginx Upload Progress Module, append upload key to the URL
            // Also, preserve query string if there is one
            url = !opts.nginxProgressUrl ?
                    opts.url :
                    url + ( ( url.indexOf( '?' ) > -1 ) ? '&' : '?' ) +
                          encodeURIComponent( opts.nginxProgressHeader ) +
                          '=' + encodeURIComponent( key );
        }

        form = ss.getForm({
            action: url,
            target: iframe.name,
            method: opts.method
        });

        // Begin progress bars at 0%
        opts.onProgress.call( this, 0 );

        if ( pctBox ) {
            pctBox.innerHTML = '0%';
        }

        if ( progBar ) {
            progBar.style.width = '0%';
        }

        // For CORS, add a listener for the "message" event, which will be
        // triggered by the Javascript snippet in the server response
        if ( opts.cors ) {
            removeMessageListener = ss.addEvent( window, 'message', function( event ) {
                // Make sure event.origin matches the upload URL
                if ( self._getHost( event.origin ) != self._getHost( opts.url ) ) {
                    self.log('Non-matching origin: ' + event.origin);
                    return;
                }

                // Set message event success flag to true
                msgLoaded = true;

                // Remove listener for message event
                removeMessageListener();

                opts.endNonXHR.call( self, fileObj.name, fileObj.btn );

                self._finish( fileObj,  '', '', event.data, sizeBox, progBox, pctBox, abortBtn, removeAbort );
            });
        }

        var remove = ss.addEvent( iframe, 'load', function() {
            remove();

            if ( opts.sessionProgressUrl ) {
                form.appendChild( ss.getHidden( opts.sessionProgressName, key ) );
            }

            // PHP APC upload progress key field must come before the file field
            else if ( opts.progressUrl ) {
                form.appendChild( ss.getHidden( opts.keyParamName, key ) );
            }

            // We get any additional data here after startNonXHR()
            // in case the data was changed with setData() prior to submitting
            for ( var prop in opts.data ) {
                if ( opts.data.hasOwnProperty( prop ) ) {
                    form.appendChild( ss.getHidden( prop, opts.data[prop] ) );
                }
            }

            // Add a field (default name: "XHR_CORS_TRARGETORIGIN") to tell server this is a CORS request
            // Value of the field is targetOrigin parameter of postMessage(message, targetOrigin)
            if ( opts.cors ) {
                form.appendChild( ss.getHidden( opts.corsInputName, window.location.href ) );
            }

            form.appendChild( fileObj.file );

            removeLoadListener = ss.addEvent( iframe, 'load', function() {
                if ( !iframe.parentNode || iframeLoaded ) {
                    return;
                }

                iframeLoaded = true;

                delete self._progKeys[key];
                delete self._sizeFlags[key];

                // Remove listener for iframe load event
                removeLoadListener();

                if ( abortBtn ) {
                    ss.removeEvent( abortBtn, 'click', cancel );
                }

                // After a CORS response, we wait briefly for the "message" event to finish,
                // during which time the msgLoaded var will be set to true, signalling success.
                // If iframe loads without "message" event, we assume there was an error
                if ( opts.cors ) {
                    window.setTimeout(function() {
                        ss.remove( form );
                        ss.remove( iframe );

                        // If msgLoaded has not been set to true after "message" event fires, we
                        // infer that an error must have occurred and respond accordingly
                        if ( !msgLoaded ) {
                            self._errorFinish( fileObj, '', '', false, 'error', progBox, sizeBox, pctBox, abortBtn, removeAbort );
                        }

                        opts = key = form = iframe = sizeBox = progBox = pctBox = abortBtn = removeAbort = null;
                    }, 600);
                }

                // Ordinary, non-CORS upload
                else {
                    try {
                        var doc = iframe.contentDocument ? iframe.contentDocument : iframe.contentWindow.document,
                            response = doc.body.innerHTML;

                        opts.endNonXHR.call( self, fileObj.name, fileObj.btn );

                        // No way to get status and statusText for an iframe so return empty strings
                        self._finish( fileObj, '', '', response, sizeBox, progBox, pctBox, abortBtn, removeAbort );

                    } catch ( e ) {
                        self._errorFinish( fileObj, '', e.message, false, 'error', progBox, sizeBox, pctBox, abortBtn, removeAbort );
                    }

                    window.setTimeout(function() {
                        ss.remove( form );
                        ss.remove( iframe );
                        form = iframe = null;
                    }, 0);

                    fileObj = opts = key = sizeBox = progBox = pctBox = null;
                }
            });// end load

            if ( abortBtn ) {
                cancel = function() {
                    ss.removeEvent( abortBtn, 'click', cancel );

                    delete self._progKeys[key];
                    delete self._sizeFlags[key];

                    if ( iframe ) {
                        iframeLoaded = true;
                        removeLoadListener();

                        try {
                            if ( iframe.contentWindow.document.execCommand ) {
                                iframe.contentWindow.document.execCommand('Stop');
                            }

                            iframe.src = 'javascript'.concat(':false;');

                        } catch( err ) {}

                        window.setTimeout(function() {
                            ss.remove( form );
                            ss.remove( iframe );
                            form = iframe = null;
                        }, 0);
                    }

                    self.log('Upload aborted');
                    opts.onAbort.call( self, fileObj.name, fileObj.btn );
                    self._last( sizeBox, progBox, pctBox, abortBtn, removeAbort );
                };

                ss.addEvent( abortBtn, 'click', cancel );
            }

            self.log( 'Commencing upload using iframe' );
            form.submit();

            if ( self._hasProgUrl ) {
                // Add progress key to active key array
                self._progKeys[key] = 1;

                // Start timer for first progress update
                window.setTimeout( function() {
                    self._getProg( key, progBar, sizeBox, pctBox, 1 );
                    progBar = sizeBox = pctBox = null;
                }, opts.checkProgressInterval );
            }

            // Remove this file from the queue and begin next upload
            window.setTimeout(function() {
                self.removeCurrent( fileObj.id );
            }, 0);

        });// end load

        document.body.appendChild( form );
        document.body.appendChild( iframe );
    },

    /**
    * Retrieves upload progress updates from the server
    * (For fallback upload progress support)
    */
    _getProg: function( key, progBar, sizeBox, pctBox, counter ) {
        "use strict";

        var self = this,
            opts = this._opts,
            time = new Date().getTime(),
            xhr,
            url,
            callback;

        if ( !key ) {
            return;
        }

        // Nginx Upload Progress Module
        if ( opts.nginxProgressUrl ) {
            url = opts.nginxProgressUrl + '?' +
                  encodeURIComponent( opts.nginxProgressHeader ) + '=' + encodeURIComponent( key ) +
                  '&_=' + time;
        }

        else if ( opts.sessionProgressUrl ) {
            url = opts.sessionProgressUrl;
        }

        // PHP APC upload progress
        else if ( opts.progressUrl ) {
            url = opts.progressUrl +
            '?progresskey=' + encodeURIComponent( key ) +
            '&_=' + time;
        }

        callback = function() {
            var response,
                size,
                pct,
                status,
                statusText;

            try {
                // XDomainRequest doesn't have readyState so we
                // just assume that it finished correctly
                if ( callback && ( opts.cors || xhr.readyState === 4 ) ) {
                    callback = undefined;
                    xhr.onreadystatechange = function() {};

                    try {
                        statusText = xhr.statusText;
                        status = xhr.status;
                    } catch( e ) {
                        // We normalize with Webkit giving an empty statusText
                        statusText = '';
                        status = '';
                    }

                    // XDomainRequest also doesn't have status, so we
                    // again just assume that everything is fine
                    if ( opts.cors || ( status >= 200 && status < 300 ) ) {
                        response = ss.parseJSON( xhr.responseText );

                        if ( response === false ) {
                            self.log( 'Error parsing progress response (expecting JSON)' );
                            return;
                        }

                        // Handle response if using Nginx Upload Progress Module
                        if ( opts.nginxProgressUrl ) {

                            if ( response.state == 'uploading' ) {
                                size = parseInt( response.size, 10 );
                                if ( size > 0 ) {
                                    pct = Math.round( ( parseInt( response.received, 10 ) / size ) * 100 );
                                    size = Math.round( size / 1024 ); // convert to kilobytes
                                }

                            } else if ( response.state == 'done' ) {
                                pct = 100;

                            } else if ( response.state == 'error' ) {
                                self.log( 'Error requesting upload progress: ' + response.status );
                                return;
                            }
                        }

                        // Handle response if using PHP APC
                        else if ( opts.sessionProgressUrl || opts.progressUrl ) {
                            if ( response.success === true ) {
                                size = parseInt( response.size, 10 );
                                pct = parseInt( response.pct, 10 );
                            }
                        }

                        // Update progress bar width
                        if ( pct ) {
                            if ( pctBox ) {
                                pctBox.innerHTML = pct + '%';
                            }

                            if ( progBar ) {
                                progBar.style.width = pct + '%';
                            }

                            opts.onProgress.call( self, pct );
                        }

                        if ( size && !self._sizeFlags[key] ) {
                            if ( sizeBox ) {
                                sizeBox.innerHTML = size + 'K';
                            }

                            self._sizeFlags[key] = 1;
                            opts.onUpdateFileSize.call( self, size );
                        }

                        // Stop attempting progress checks if we keep failing
                        if ( !pct &&
                             !size &&
                             counter >= self._maxFails )
                        {
                            counter++;
                            self.log( 'Failed progress request limit reached. Count: ' + counter );
                            return;
                        }

                        // Begin countdown until next progress update check
                        if ( pct < 100 && self._progKeys[key] ) {
                            window.setTimeout( function() {
                                self._getProg( key, progBar, sizeBox, pctBox, counter );

                                key = progBar = sizeBox = pctBox = counter = null;
                            }, opts.checkProgressInterval );
                        }

                        // We didn't get a 2xx status so don't continue sending requests
                    } else {
                        delete self._progKeys[key];
                        self.log( 'Error requesting upload progress: ' + status + ' ' + statusText );
                    }

                    xhr = size = pct = status = statusText = response = null;
                }

            } catch( e ) {
                self.log( 'Error requesting upload progress: ' + e.message );
            }
        };

        // CORS requests in IE8 and IE9 must use XDomainRequest
        if ( opts.cors && !opts.sessionProgressUrl ) {

            if ( window.XDomainRequest ) {
                xhr = new window.XDomainRequest();
                xhr.open( 'GET', url, true );
                xhr.onprogress = xhr.ontimeout = function() {};
                xhr.onload = callback;

                xhr.onerror = function() {
                    delete self._progKeys[key];
                    key = null;
                    self.log('Error requesting upload progress');
                };

                // IE7 or some other dinosaur -- just give up
            } else {
                return;
            }

        } else {
            var method = !opts.sessionProgressUrl ? 'GET' : 'POST',
                params;

            xhr = ss.newXHR();
            xhr.onreadystatechange = callback;
            xhr.open( method, url, true );

            // PHP session progress updates must be a POST request
            if ( opts.sessionProgressUrl ) {
                params = encodeURIComponent( opts.sessionProgressName ) + '=' + encodeURIComponent( key );
                xhr.setRequestHeader( 'Content-type', 'application/x-www-form-urlencoded' );
            }

            // Set the upload progress header for Nginx
            if ( opts.nginxProgressUrl ) {
                xhr.setRequestHeader( opts.nginxProgressHeader, key );
            }

            xhr.setRequestHeader( 'X-Requested-With', 'XMLHttpRequest' );
            xhr.setRequestHeader( 'Accept', 'application/json, text/javascript, */*; q=0.01' );

           xhr.send( ( opts.sessionProgressUrl &&  params ) || null );
        }
    },

    _initUpload: function( fileObj ) {
        if ( false === this._opts.startNonXHR.call( this, fileObj.name, fileObj.btn ) ) {

            if ( this._disabled ) {
                this.enable( true );
            }

            this._active--;
            return;
        }

        this._hasProgUrl = ( this._opts.progressUrl ||
                             this._opts.sessionProgressUrl ||
                             this._opts.nginxProgressUrl ) ?
                             true : false;

        this._uploadIframe( fileObj, this._progBox, this._sizeBox, this._progBar, this._pctBox, this._abortBtn, this._removeAbort );

        this._progBox = this._sizeBox = this._progBar = this._pctBox = this._abortBtn = this._removeAbort = null;
    }
};

ss.XhrUpload = {

    _addFiles: function( files ) {
        var total = files.length,
            filename,
            ext,
            size,
            i;

        if ( !this._opts.multiple ) {
            total = 1;
        }

        for ( i = 0; i < total; i++ ) {
            filename = ss.getFilename( files[i].name );
            ext = ss.getExt( filename );
            size = Math.round( files[i].size / 1024 );

            if ( false === this._opts.onChange.call( this, filename, ext, size ) ) {
                return false;
            }

            this._queue.push({
                id: ss.getUID(),
                file: files[i],
                name: filename,
                ext: ext,
                btn: this._overBtn,
                size: size
            });
        }

        return true;
    },

    /**
    * Handles uploading with XHR
    */
    _uploadXhr: function( fileObj, url, params, headers, sizeBox, progBar, progBox, pctBox, abortBtn, removeAbort ) {
        "use strict";

        var self = this,
            opts = this._opts,
            xhr = ss.newXHR(),
            callback,
            cancel;

        // Inject file size into size box
        if ( sizeBox ) {
            sizeBox.innerHTML = fileObj.size + 'K';
        }

        // Begin progress bars at 0%
        if ( pctBox ) {
            pctBox.innerHTML = '0%';
        }

        if ( progBar ) {
            progBar.style.width = '0%';
        }

        opts.onProgress.call( this, 0 );

        // Borrows heavily from jQuery ajax transport
        callback = function( _, isAbort ) {
            var status,
                statusText;

            // Firefox throws exceptions when accessing properties
            // of an xhr when a network error occurred
            try {
                // Was never called and is aborted or complete
                if ( callback && ( isAbort || xhr.readyState === 4 ) ) {

                    callback = undefined;
                    xhr.onreadystatechange = function() {};

                    // If it's an abort
                    if ( isAbort ) {

                        // Abort it manually if needed
                        if ( xhr.readyState !== 4 ) {
                            xhr.abort();
                        }

                        opts.onAbort.call( self, fileObj.name, fileObj.btn );
                        self._last( sizeBox, progBox, pctBox, abortBtn, removeAbort );

                    } else {
                        if ( abortBtn ) {
                            ss.removeEvent( abortBtn, 'click', cancel );
                        }

                        status = xhr.status;

                        // Firefox throws an exception when accessing
                        // statusText for faulty cross-domain requests
                        try {
                            statusText = xhr.statusText;

                        } catch( e ) {
                            // We normalize with Webkit giving an empty statusText
                            statusText = '';
                        }

                        if ( status >= 200 && status < 300 ) {
                            opts.endXHR.call( self, fileObj.name, fileObj.size, fileObj.btn );
                            self._finish( fileObj, status, statusText, xhr.responseText, sizeBox, progBox, pctBox, abortBtn, removeAbort );

                            // We didn't get a 2xx status so throw an error
                        } else {
                            self._errorFinish( fileObj, status, statusText, xhr.responseText, 'error', progBox, sizeBox, pctBox, abortBtn, removeAbort );
                        }
                    }
                }

            }
            catch ( e ) {
                if ( !isAbort ) {
                    self._errorFinish( fileObj, -1, e.message, false, 'error', progBox, sizeBox, pctBox, abortBtn, removeAbort );
                }
            }
        };

        if ( abortBtn ) {
            cancel = function() {
                ss.removeEvent( abortBtn, 'click', cancel );

                if ( callback ) {
                    callback( undefined, true );
                }
            };

            ss.addEvent( abortBtn, 'click', cancel );
        }

        xhr.onreadystatechange = callback;
        xhr.open( opts.method.toUpperCase(), url, true );

        ss.extendObj( headers, opts.customHeaders );

        for ( var i in headers ) {
            if ( headers.hasOwnProperty( i ) ) {
                xhr.setRequestHeader( i, headers[ i ] + '' );
            }
        }

        ss.addEvent( xhr.upload, 'progress', function( event ) {
            if ( event.lengthComputable ) {
                var pct = Math.round( ( event.loaded / event.total ) * 100 );

                opts.onProgress.call( self, pct );

                if ( pctBox ) {
                    pctBox.innerHTML = pct + '%';
                }

                if ( progBar ) {
                    progBar.style.width = pct + '%';
                }
            }
        });

        if ( opts.multipart === true ) {
            var formData = new FormData();

            for ( var prop in params ) {
                if ( params.hasOwnProperty( prop ) ) {
                    formData.append( prop, params[prop] );
                }
            }

            formData.append( opts.name, fileObj.file );
            this.log( 'Commencing upload using multipart form' );
            xhr.send( formData );

        } else {
            this.log( 'Commencing upload using binary stream' );
            xhr.send( fileObj.file );
        }

        // Remove file from upload queue and begin next upload
        this.removeCurrent( fileObj.id );
    },

    _initUpload: function( fileObj ) {
        "use strict";

        var params = {},
            headers = {},
            url;

        // Call the startXHR() callback and stop upload if it returns false
        // We call it before _uploadXhr() in case setProgressBar, setPctBox, etc., is called
        if ( false === this._opts.startXHR.call( this, fileObj.name, fileObj.size, fileObj.btn ) ) {

            if ( this._disabled ) {
                this.enable( true );
            }

            this._active--;
            return;
        }

        params[this._opts.name] = fileObj.name;

        headers['X-Requested-With'] = 'XMLHttpRequest';
        headers['X-File-Name'] = fileObj.name;

        if ( this._opts.responseType.toLowerCase() == 'json' ) {
            headers['Accept'] = 'application/json, text/javascript, */*; q=0.01';
        }

        if ( !this._opts.multipart ) {
            headers['Content-Type'] = 'application/octet-stream';
        }

        // We get the any additional data here after startXHR()
        ss.extendObj( params, this._opts.data );

        // Build query string while preserving any existing parameters
        url = this._opts.noParams === true ?
                this._opts.url :
                this._opts.url + ( ( this._opts.url.indexOf( '?' ) > -1 ) ? '&' : '?' ) +ss.obj2string( params );

        this._uploadXhr( fileObj, url, params, headers, this._sizeBox, this._progBar, this._progBox, this._pctBox, this._abortBtn, this._removeAbort );

        this._sizeBox = this._progBar = this._progBox = this._pctBox = this._abortBtn = this._removeAbort = null;
    }

};

(function(){
    ss.extendObj( ss.SimpleUpload.prototype, {

        _createInput: function() {
            "use strict";

            var self = this,
                div = document.createElement( 'div' );

            this._input = document.createElement( 'input' );
            this._input.type = 'file';
            this._input.name = this._opts.name;

            // Don't allow multiple file selection in Safari -- it has a nasty bug
            // http://stackoverflow.com/q/7231054/1091949
            if ( XhrOk && !isSafari && this._opts.multiple ) {
                this._input.multiple = true;
            }

            // Check support for file input accept attribute
            if ( 'accept' in this._input && this._opts.accept !== '' ) {
                this._input.accept = this._opts.accept;
            }

            ss.addStyles( div, {
                'display' : 'block',
                'position' : 'absolute',
                'overflow' : 'hidden',
                'margin' : 0,
                'padding' : 0,
                'opacity' : 0,
                'direction' : 'ltr',
                'zIndex': 2147483583
            });

            ss.addStyles( this._input, {
                'position' : 'absolute',
                'right' : 0,
                'margin' : 0,
                'padding' : 0,
                'fontSize' : '480px',
                'fontFamily' : 'sans-serif',
                'cursor' : 'pointer'
            });

            if ( div.style.opacity !== '0' ) {
                div.style.filter = 'alpha(opacity=0)';
            }

            ss.addEvent( this._input, 'change', function() {
                if ( !self._input || self._input.value === '' ) {
                    return;
                }

                if ( false === self._addFiles( XhrOk ? self._input.files : self._input ) ) {
                    return;
                }

                ss.removeClass( self._overBtn, self._opts.hoverClass );
                ss.removeClass( self._overBtn, self._opts.focusClass );

                // Now that file is in upload queue, remove the file input
                ss.remove( self._input.parentNode );
                delete self._input;

                // Then create a new file input
                self._createInput();

                // Submit if autoSubmit option is true
                if ( self._opts.autoSubmit ) {
                    self.submit();
                }
            });

            if ( self._opts.hoverClass !== '' ) {
                ss.addEvent( this._input, 'mouseover', function() {
                    ss.addClass( self._overBtn, self._opts.hoverClass );
                });

                ss.addEvent( this._input, 'mouseout', function() {
                    ss.removeClass( self._overBtn, self._opts.hoverClass );
                    ss.removeClass( self._overBtn, self._opts.focusClass );
                    self._input.parentNode.style.visibility = 'hidden';
                });
            }

            if ( self._opts.focusClass !== '' ) {
                ss.addEvent( this._input, 'focus', function() {
                    ss.addClass( self._overBtn, self._opts.focusClass );
                });

                ss.addEvent( this._input, 'blur', function() {
                    ss.removeClass( self._overBtn, self._opts.focusClass );
                });
            }

            div.appendChild( this._input );
            document.body.appendChild( div );
        },

        rerouteClicks: function( elem ) {
            "use strict";

            var self = this;

            // ss.addEvent() returns a function to detach, which
            // allows us to call elem.off() to remove mouseover listener
            elem.off = ss.addEvent( elem, 'mouseover', function() {
                if ( self._disabled ) {
                    return;
                }

                if ( !self._input ) {
                    self._createInput();
                }

                self._overBtn = elem;
                ss.copyLayout( elem, self._input.parentNode );
                self._input.parentNode.style.visibility = 'visible';
            });

            return elem;
        },

        /**
        * Final cleanup function after upload ends
        */
        _last: function( sizeBox, progBox, pctBox, abortBtn, removeAbort ) {
            "use strict";

            if ( sizeBox ) {
               sizeBox.innerHTML = '';
            }

            if ( pctBox ) {
                pctBox.innerHTML = '';
            }

            if ( abortBtn && removeAbort ) {
                ss.remove( abortBtn );
            }

            if ( progBox ) {
                ss.remove( progBox );
            }

            // Decrement the active upload counter
            this._active--;

            sizeBox = progBox = pctBox = abortBtn = removeAbort = null;

            if ( this._disabled ) {
                this.enable( true );
            }

            this._cycleQueue();
        },

        /**
        * Completes upload request if an error is detected
        */
        _errorFinish: function( fileObj, status, statusText, response, errorType, progBox, sizeBox, pctBox, abortBtn, removeAbort ) {
            "use strict";

            this.log( 'Upload failed: ' + status + ' ' + statusText );
            this._opts.onError.call( this, fileObj.name, errorType, status, statusText, response, fileObj.btn );
            this._last( sizeBox, progBox, pctBox, abortBtn, removeAbort );

            fileObj = status = statusText = response = errorType = sizeBox = progBox = pctBox = abortBtn = removeAbort = null;
        },

        /**
        * Completes upload request if the transfer was successful
        */
        _finish: function( fileObj, status, statusText, response, sizeBox, progBox, pctBox, abortBtn, removeAbort ) {
            "use strict";

            this.log( 'Server response: ' + response );

            if ( this._opts.responseType.toLowerCase() == 'json' ) {
                response = ss.parseJSON( response );

                if ( response === false ) {
                    this._errorFinish( fileObj, status, statusText, false, 'parseerror', progBox, sizeBox, abortBtn, removeAbort );
                    return;
                }
            }

            this._opts.onComplete.call( this, fileObj.name, response, fileObj.btn );
            this._last( sizeBox, progBox, pctBox, abortBtn, removeAbort );

            fileObj = status = statusText = response = sizeBox = progBox = pctBox = abortBtn = removeAbort = null;
        },

        /**
        * Verifies that file is allowed
        * Checks file extension and file size if limits are set
        */
        _checkFile: function( fileObj ) {
            "use strict";

            var extOk = false,
                i = this._opts.allowedExtensions.length;

            // Only file extension if allowedExtensions is set
            if ( i > 0 ) {
                while ( i-- ) {
                    if ( this._opts.allowedExtensions[i].toLowerCase() == fileObj.ext.toLowerCase() ) {
                        extOk = true;
                        break;
                    }
                }

                if ( !extOk ) {
                    this.removeCurrent( fileObj.id );
                    this.log( 'File extension not permitted' );
                    this._opts.onExtError.call( this, fileObj.name, fileObj.ext );
                    return false;
                }
            }

            if ( fileObj.size &&
                this._opts.maxSize !== false &&
                fileObj.size > this._opts.maxSize )
            {
                this.removeCurrent( fileObj.id );
                this.log( fileObj.name + ' exceeds ' + this._opts.maxSize + 'K limit' );
                this._opts.onSizeError.call( this, fileObj.name, fileObj.size );
                return false;
            }

            fileObj = null;

            return true;
        },

        /**
        * Validates input and directs to either XHR method or iFrame method
        */
        submit: function() {
            "use strict";

            if ( this._disabled ||
                this._active >= this._opts.maxUploads ||
                this._queue.length < 1 )
            {
                return;
            }

            if ( !this._checkFile( this._queue[0] ) ) {
                return;
            }

            // User returned false to cancel upload
            if ( false === this._opts.onSubmit.call( this, this._queue[0].name, this._queue[0].ext, this._queue[0].btn, this._queue[0].size ) ) {
                return;
            }

            // Increment the active upload counter
            this._active++;

            // Disable uploading if multiple file uploads are not enabled
            // or if queue is disabled and we've reached max uploads
            if ( this._opts.multiple === false ||
                this._opts.queue === false && this._active >= this._opts.maxUploads )
            {
                this.disable( true );
            }

            this._initUpload( this._queue[0] );
        }
    });

    if ( XhrOk ) {
        ss.extendObj( ss.SimpleUpload.prototype, ss.XhrUpload );

    } else {
        ss.extendObj( ss.SimpleUpload.prototype, ss.IframeUpload );
    }

}());

ss.extendObj(ss.SimpleUpload.prototype, {

    _dragFileCheck: function( e ) {
        if ( e.dataTransfer.types ) {
            for ( var i = 0; i < e.dataTransfer.types.length; i++ ) {
                if ( e.dataTransfer.types[i] == 'Files' ) {
                    return true;
                }
            }
        }

        return false;
    },

    addDropZone: function( elem ) {
        var self = this;

        elem = ss.verifyElem( elem );

        if ( !elem ) {
            self.log( 'Invalid or nonexistent element passed for drop zone' );
            return false;
        }

        elem.ondragenter = function( e ) {
            if ( !self._dragFileCheck( e ) ) {
                return false;
            }
            ss.addClass( this, self._opts.dragClass );
            return false;
        };

        elem.ondragover = function() {
            return false;
        };

        elem.ondragend = function() {
            ss.removeClass( this, self._opts.dragClass );
            return false;
        };

        elem.ondragleave = function() {
            ss.removeClass( this, self._opts.dragClass );
            return false;
        };

        elem.ondrop = function( e ) {
            e.preventDefault();

            if ( !self._dragFileCheck( e ) ) {
                return false;
            }

            self._addFiles( e.dataTransfer.files );
            self._cycleQueue();
            ss.removeClass( this, self._opts.dragClass );
        };
    }
});

// Expose to the global window object
window.ss = ss;

})( window, document );