AjaxUpLoad.js使用实现文件上传

AjaxUpLoad.js的使用实现无刷新文件上传，如图。

图1 文件上传前

图2 文件上传后

1、创建页面并编写HTML

 

上传文档:
<div class="uploadFile">
    <span id="doc"><input type="text" disabled="disabled" /></span>
    <input type="hidden" id="hidFileName"  />
    <input type="button" id="btnUploadFile" value="上传" />
    <input type="button" id="btnDeleteFile" value="删除"  />
</div>

上传图片:
<div class="uploadImg">
    <img id="imgShow" src="/images/nophoto.gif" />
    <input type="hidden" id="hidImgName" />
    <input type="button" id="btnUploadImg" value="上传" />
    <input type="button" id="btnDeleteImg" value="删除" />
</div>

2、引用AjaxUpload.js文件

<script src="/js/common/AjaxUpload.js" type="text/javascript"></script>

3、编写JS脚本

window.onload = function() {
    init();  //初始化
}

//初始化
function init() {
    //初始化文档上传
    var btnFile = document.getElementById("btnUploadFile");
    var doc = document.getElementById("doc");
    var hidFileName = document.getElementById("hidFileName");
    document.getElementById("btnDeleteFile").onclick = function() { DelFile(doc, hidFileName); };
    g_AjxUploadFile(btnFile, doc, hidFileName);

    //初始化图片上传
    var btnImg = document.getElementById("btnUploadImg");
    var img = document.getElementById("imgShow");
    var hidImgName = document.getElementById("hidImgName");
    document.getElementById("btnDeleteImg").onclick = function() { DelImg(img, hidImgName); };
    g_AjxUploadImg(btnImg, img, hidImgName);
}


var g_AjxTempDir = "/file/temp/";
//文档上传
function g_AjxUploadFile(btn, doc, hidPut, action) {
    var button = btn, interval;
    new AjaxUpload(button, {
    action: ((action == null || action == undefined) ? '/Common/UploadHandler.ashx?fileType=file' : action),
        data: {},
        name: 'myfile',
        onSubmit: function(file, ext) {
            if (!(ext && /^(rar|zip|pdf|pdfx|txt|csv|xls|xlsx|doc|docx|RAR|ZIP|PDF|PDFX|TXT|CSV|XLS|XLSX|DOC|DOCX)$/.test(ext))) {
                alert("您上传的文档格式不对，请重新选择！");
                return false;
            }
        },
        onComplete: function(file, response) {
            flagValue = response;
            if (flagValue == "1") {
                alert("您上传的文档格式不对，请重新选择！");
            }
            else if (flagValue == "2") {
                alert("您上传的文档大于2M，请重新选择！");
            }
            else if (flagValue == "3") {
                alert("文档上传失败！");
            }
            else {
                hidPut.value = response;
                doc.innerHTML="<a href='" + g_AjxTempDir + response + "' target='_blank'>" + response + "</a>";
            }
        }
    });
}
//图片上传
function g_AjxUploadImg(btn, img, hidPut) {
    var button = btn, interval;
    new AjaxUpload(button, {
        action: '/Common/UploadHandler.ashx?fileType=img',
        data: {},
        name: 'myfile',
        onSubmit: function(file, ext) {
            if (!(ext && /^(jpg|JPG|png|PNG|gif|GIF)$/.test(ext))) {
                alert("您上传的图片格式不对，请重新选择！");
                return false;
            }
        },
        onComplete: function(file, response) {
            flagValue = response;
            if (flagValue == "1") {
                alert("您上传的图片格式不对，请重新选择！");
            }
            else if (flagValue == "2") {
                alert("您上传的图片大于200K，请重新选择！");
            }
            else if (flagValue == "3") {
                alert("图片上传失败！");
            }
            else {
                hidPut.value = response;
                img.src = g_AjxTempDir + response;
            }
        }
    });
}

//删除文档
function DelFile(doc, hidPut) {
    hidPut.value = "";
    doc.innerHTML = "<input type=\"text\" disabled=\"disabled\" />";
}

//删除图片
function DelImg(img, hidPut) {
    hidPut.value = "";
    img.src = "/images/nophoto.gif";
}

 

4、创建/Common/UploadHandler.ashx处理程序

 

<%@ WebHandler Language="C#" Class="UploadHandler" %>

using System;
using System.Web;
using System.Text.RegularExpressions;
using System.IO;

public class UploadHandler : IHttpHandler {
    private string _filedir = "";    //文件目录
    /// <summary>
    /// 处理上传文件(1:文件格式不正确、2:文件大小不正确、3:上传失败、文件名称:上传成功)
    /// </summary>
    /// <param name="context"></param>
    public void ProcessRequest (HttpContext context) {
        _filedir = context.Server.MapPath(@"/file/temp/");
        try
        {
            string result = "3";
            string fileType = context.Request.QueryString["fileType"]; //获取上传文件类型
            if (fileType == "file")
            {
                result = UploadFile(context);  //文档上传
            }
            else if (fileType == "img")
            {
                result = UploadImg(context);   //图片上传
            }
            context.Response.Write(result);
        }
        catch
        {
            context.Response.Write("3");//3文件上传失败
        }
    }

    /// <summary>
    /// 文档上传
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    private string UploadFile(HttpContext context)
    {
        int cout = context.Request.Files.Count;
        if (cout > 0)
        {
            HttpPostedFile hpf = context.Request.Files[0];
            if (hpf != null)
            {
                string fileExt = Path.GetExtension(hpf.FileName).ToLower();
                //只能上传文件，过滤不可上传的文件类型
                string fileFilt = ".rar|.zip|.pdf|.pdfx|.txt|.csv|.xls|.xlsx|.doc|.docx......";
                if (fileFilt.IndexOf(fileExt) <= -1)
                {
                    return "1";
                }

                //判断文件大小
                int length = hpf.ContentLength;
                if (length > 2097152)
                {
                    return "2";
                }

                Random rd = new Random();
                DateTime nowTime = DateTime.Now;
                string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName);
                if (!Directory.Exists(_filedir))
                {
                    Directory.CreateDirectory(_filedir);
                }
                string fileName = _filedir + newFileName;
                hpf.SaveAs(fileName);
                return newFileName;
            }

        }
        return "3";
    }

    /// <summary>
    /// 图片上传
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    private string UploadImg(HttpContext context)
    {
        int cout = context.Request.Files.Count;
        if (cout > 0)
        {
            HttpPostedFile hpf = context.Request.Files[0];
            if (hpf != null)
            {
                string fileExt = Path.GetExtension(hpf.FileName).ToLower();
                //只能上传文件，过滤不可上传的文件类型
                string fileFilt = ".gif|.jpg|.php|.jsp|.jpeg|.png|......";
                if (fileFilt.IndexOf(fileExt) <= -1)
                {
                    return "1";
                }

                //判断文件大小
                int length = hpf.ContentLength;
                if (length > 204800)
                {
                    return "2";
                }

                Random rd = new Random();
                DateTime nowTime = DateTime.Now;
                string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName);
                if (!Directory.Exists(_filedir))
                {
                    Directory.CreateDirectory(_filedir);
                }
                string fileName = _filedir + newFileName;
                hpf.SaveAs(fileName);
                return newFileName;
            }

        }
        return "3";
    }

    #region IHttpHandler 成员

    public bool IsReusable
    {
        get { throw new NotImplementedException(); }
    }

    #endregion
}

附件1：页面CSS样式

/*上传文件*/
.uploadFile{margin-bottom:10px;}
/*上传图片*/
.uploadImg{}
.uploadImg img{width:102px; height:64px; border:1px solid #CCCCCC; display: block;}

附件2：AjaxUpload.js文件

/**
 * AJAX Upload ( http://valums.com/ajax-upload/ )
 * Copyright (c) Andris Valums
 * Licensed under the MIT license ( http://valums.com/mit-license/ )
 * Thanks to Gary Haran, David Mark, Corey Burns and others for contributions
 */
(function () {
    /* global window */
    /* jslint browser: true, devel: true, undef: true, nomen: true, bitwise: true, regexp: true, newcap: true, immed: true */

    /**
     * Wrapper for FireBug's console.log
     */

    function log() {
        if (typeof(console) != 'undefined' && typeof(console.log) == 'function') {
            Array.prototype.unshift.call(arguments, '[Ajax Upload]');
            console.log(Array.prototype.join.call(arguments, ' '));
        }
    }

    /**
     * Attaches event to a dom element.
     * @param {Element} el
     * @param type event name
     * @param fn callback This refers to the passed element
     */

    function addEvent(el, type, fn) {
        if (el.addEventListener) {
            el.addEventListener(type, fn, false);
        } else if (el.attachEvent) {
            el.attachEvent('on' + type, function () {
                fn.call(el);
            });
        } else {
            throw new Error('not supported or DOM not loaded');
        }
    }

    /**
     * Attaches resize event to a window, limiting
     * number of event fired. Fires only when encounteres
     * delay of 100 after series of events.
     *
     * Some browsers fire event multiple times when resizing
     * http://www.quirksmode.org/dom/events/resize.html
     *
     * @param fn callback This refers to the passed element
     */

    function addResizeEvent(fn) {
        var timeout;

        addEvent(window, 'resize', function () {
            if (timeout) {
                clearTimeout(timeout);
            }
            timeout = setTimeout(fn, 100);
        });
    }

    // Needs more testing, will be rewriten for next version
    // getOffset function copied from jQuery lib (http://jquery.com/)
    if (document.documentElement.getBoundingClientRect) {
        // Get Offset using getBoundingClientRect
        // http://ejohn.org/blog/getboundingclientrect-is-awesome/
        var getOffset = function (el) {
            var box = el.getBoundingClientRect();
            var doc = el.ownerDocument;
            var body = doc.body;
            var docElem = doc.documentElement; // for ie
            var clientTop = docElem.clientTop || body.clientTop || 0;
            var clientLeft = docElem.clientLeft || body.clientLeft || 0;

            // In Internet Explorer 7 getBoundingClientRect property is treated as physical,
            // while others are logical. Make all logical, like in IE8.
            var zoom = 1;
            if (body.getBoundingClientRect) {
                var bound = body.getBoundingClientRect();
                zoom = (bound.right - bound.left) / body.clientWidth;
            }

            if (zoom > 1) {
                clientTop = 0;
                clientLeft = 0;
            }

            var top = box.top / zoom + (window.pageYOffset || docElem && docElem.scrollTop / zoom || body.scrollTop / zoom) - clientTop,
                left = box.left / zoom + (window.pageXOffset || docElem && docElem.scrollLeft / zoom || body.scrollLeft / zoom) - clientLeft;

            return {
                top: top,
                left: left
            };
        };
    } else {
        // Get offset adding all offsets
        var getOffset = function (el) {
            var top = 0,
                left = 0;
            do {
                top += el.offsetTop || 0;
                left += el.offsetLeft || 0;
                el = el.offsetParent;
            } while (el);

            return {
                left: left,
                top: top
            };
        };
    }

    /**
     * Returns left, top, right and bottom properties describing the border-box,
     * in pixels, with the top-left relative to the body
     * @param {Element} el
     * @return {Object} Contains left, top, right,bottom
     */

    function getBox(el) {
        var left, right, top, bottom;
        var offset = getOffset(el);
        left = offset.left;
        top = offset.top;

        right = left + el.offsetWidth;
        bottom = top + el.offsetHeight;

        return {
            left: left,
            right: right,
            top: top,
            bottom: bottom
        };
    }

    /**
     * Helper that takes object literal
     * and add all properties to element.style
     * @param {Element} el
     * @param {Object} styles
     */

    function addStyles(el, styles) {
        for (var name in styles) {
            if (styles.hasOwnProperty(name)) {
                el.style[name] = styles[name];
            }
        }
    }

    /**
     * Function places an absolutely positioned
     * element on top of the specified element
     * copying position and dimentions.
     * @param {Element} from
     * @param {Element} to
     */

    function copyLayout(from, to) {
        var box = getBox(from);

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

    /**
     * Creates and returns element from html chunk
     * Uses innerHTML to create an element
     */
    var toElement = (function () {
        var div = document.createElement('div');
        return function (html) {
            div.innerHTML = html;
            var el = div.firstChild;
            return div.removeChild(el);
        };
    })();

    /**
     * Function generates unique id
     * @return unique id
     */
    var getUID = (function () {
        var id = 0;
        return function () {
            return 'ValumsAjaxUpload' + id++;
        };
    })();

    /**
     * Get file name from path
     * @param {String} file path to file
     * @return filename
     */

    function fileFromPath(file) {
        return file.replace(/.*(\/|\\)/, "");
    }

    /**
     * Get file extension lowercase
     * @param {String} file name
     * @return file extenstion
     */

    function getExt(file) {
        return (-1 !== file.indexOf('.')) ? file.replace(/.*[.]/, '') : '';
    }

    function hasClass(el, name) {
        var re = new RegExp('\\b' + name + '\\b');
        return re.test(el.className);
    }

    function addClass(el, name) {
        if (!hasClass(el, name)) {
            el.className += ' ' + name;
        }
    }

    function removeClass(el, name) {
        var re = new RegExp('\\b' + name + '\\b');
        el.className = el.className.replace(re, '');
    }

    function removeNode(el) {
        el.parentNode.removeChild(el);
    }

    /**
     * Easy styling and uploading
     * @constructor
     * @param button An element you want convert to
     * upload button. Tested dimentions up to 500x500px
     * @param {Object} options See defaults below.
     */
    window.AjaxUpload = function (button, options) {
        this._settings = {
            // Location of the server-side upload script
            action: 'upload.php',
            // File upload name
            name: 'userfile',
            // Additional data to send
            data: {},
            // Submit file as soon as it's selected
            autoSubmit: true,
            // The type of data that you're expecting back from the server.
            // html and xml are detected automatically.
            // Only useful when you are using json data as a response.
            // Set to "json" in that case.
            responseType: false,
            // Class applied to button when mouse is hovered
            hoverClass: 'hover',
            // Class applied to button when AU is disabled
            disabledClass: 'disabled',
            // When user selects a file, useful with autoSubmit disabled
            // You can return false to cancel upload
            onChange: function (file, extension) {},
            // Callback to fire before file is uploaded
            // You can return false to cancel upload
            onSubmit: function (file, extension) {},
            // Fired when file upload is completed
            // WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE!
            onComplete: function (file, response) {}
        };

        // Merge the users options with our defaults
        for (var i in options) {
            if (options.hasOwnProperty(i)) {
                this._settings[i] = options[i];
            }
        }

        // button isn't necessary a dom element
        if (button.jquery) {
            // jQuery object was passed
            button = button[0];
        } else if (typeof button == "string") {
            if (/^#.*/.test(button)) {
                // If jQuery user passes #elementId don't break it
                button = button.slice(1);
            }

            button = document.getElementById(button);
        }

        if (!button || button.nodeType !== 1) {
            throw new Error("Please make sure that you're passing a valid element");
        }

        if (button.nodeName.toUpperCase() == 'A') {
            // disable link
            addEvent(button, 'click', function (e) {
                if (e && e.preventDefault) {
                    e.preventDefault();
                } else if (window.event) {
                    window.event.returnValue = false;
                }
            });
        }

        // DOM element
        this._button = button;
        // DOM element
        this._input = null;
        // If disabled clicking on button won't do anything
        this._disabled = false;

        // if the button was disabled before refresh if will remain
        // disabled in FireFox, let's fix it
        this.enable();

        this._rerouteClicks();
    };

    // assigning methods to our class
    AjaxUpload.prototype = {
        setData: function (data) {
            this._settings.data = data;
        },
        disable: function () {
            addClass(this._button, this._settings.disabledClass);
            this._disabled = true;

            var nodeName = this._button.nodeName.toUpperCase();
            if (nodeName == 'INPUT' || nodeName == 'BUTTON') {
                this._button.setAttribute('disabled', 'disabled');
            }

            // hide input
            if (this._input) {
                // We use visibility instead of display to fix problem with Safari 4
                // The problem is that the value of input doesn't change if it
                // has display none when user selects a file
                this._input.parentNode.style.visibility = 'hidden';
            }
        },
        enable: function () {
            removeClass(this._button, this._settings.disabledClass);
            this._button.removeAttribute('disabled');
            this._disabled = false;

        },
        /**
         * Creates invisible file input
         * that will hover above the button
         * <div><input type='file' /></div>
         */
        _createInput: function () {
            var self = this;

            var input = document.createElement("input");
            input.setAttribute('type', 'file');
            input.setAttribute('name', this._settings.name);

            addStyles(input, {
                'position': 'absolute',
                // in Opera only 'browse' button
                // is clickable and it is located at
                // the right side of the input
                'right': 0,
                'margin': 0,
                'padding': 0,
                'fontSize': '480px',
                'cursor': 'pointer'
            });

            var div = document.createElement("div");
            addStyles(div, {
                'display': 'block',
                'position': 'absolute',
                'overflow': 'hidden',
                'margin': 0,
                'padding': 0,
                'opacity': 0,
                // Make sure browse button is in the right side
                // in Internet Explorer
                'direction': 'ltr',
                //Max zIndex supported by Opera 9.0-9.2
                'zIndex': 2147483583
            });

            // Make sure that element opacity exists.
            // Otherwise use IE filter
            if (div.style.opacity !== "0") {
                if (typeof(div.filters) == 'undefined') {
                    throw new Error('Opacity not supported by the browser');
                }
                div.style.filter = "alpha(opacity=0)";
            }

            addEvent(input, 'change', function () {

                if (!input || input.value === '') {
                    return;
                }

                // Get filename from input, required
                // as some browsers have path instead of it
                var file = fileFromPath(input.value);

                if (false === self._settings.onChange.call(self, file, getExt(file))) {
                    self._clearInput();
                    return;
                }

                // Submit form when value is changed
                if (self._settings.autoSubmit) {
                    self.submit();
                }
            });

            addEvent(input, 'mouseover', function () {
                addClass(self._button, self._settings.hoverClass);
            });

            addEvent(input, 'mouseout', function () {
                removeClass(self._button, self._settings.hoverClass);

                // We use visibility instead of display to fix problem with Safari 4
                // The problem is that the value of input doesn't change if it
                // has display none when user selects a file
                input.parentNode.style.visibility = 'hidden';

            });

            div.appendChild(input);
            document.body.appendChild(div);

            this._input = input;
        },
        _clearInput: function () {
            if (!this._input) {
                return;
            }

            // this._input.value = ''; Doesn't work in IE6
            removeNode(this._input.parentNode);
            this._input = null;
            this._createInput();

            removeClass(this._button, this._settings.hoverClass);
        },
        /**
         * Function makes sure that when user clicks upload button,
         * the this._input is clicked instead
         */
        _rerouteClicks: function () {
            var self = this;

            // IE will later display 'access denied' error
            // if you use using self._input.click()
            // other browsers just ignore click()

            addEvent(self._button, 'mouseover', function () {
                if (self._disabled) {
                    return;
                }

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

                var div = self._input.parentNode;
                copyLayout(self._button, div);
                div.style.visibility = 'visible';

            });


            // commented because we now hide input on mouseleave
            /**
             * When the window is resized the elements
             * can be misaligned if button position depends
             * on window size
             */
            //addResizeEvent(function(){
            //    if (self._input){
            //        copyLayout(self._button, self._input.parentNode);
            //    }
            //});

        },
        /**
         * Creates iframe with unique name
         * @return {Element} iframe
         */
        _createIframe: function () {
            // We can't use getTime, because it sometimes return
            // same value in safari :(
            var id = getUID();

            // We can't use following code as the name attribute
            // won't be properly registered in IE6, and new window
            // on form submit will open
            // var iframe = document.createElement('iframe');
            // iframe.setAttribute('name', id);

            var iframe = toElement('<iframe src="javascript:false;" name="' + id + '" />');
            // src="javascript:false; was added
            // because it possibly removes ie6 prompt
            // "This page contains both secure and nonsecure items"
            // Anyway, it doesn't do any harm.
            iframe.setAttribute('id', id);

            iframe.style.display = 'none';
            document.body.appendChild(iframe);

            return iframe;
        },
        /**
         * Creates form, that will be submitted to iframe
         * @param {Element} iframe Where to submit
         * @return {Element} form
         */
        _createForm: function (iframe) {
            var settings = this._settings;

            // We can't use the following code in IE6
            // var form = document.createElement('form');
            // form.setAttribute('method', 'post');
            // form.setAttribute('enctype', 'multipart/form-data');
            // Because in this case file won't be attached to request
            var form = toElement('<form method="post" enctype="multipart/form-data"></form>');

            form.setAttribute('action', settings.action);
            form.setAttribute('target', iframe.name);
            form.style.display = 'none';
            document.body.appendChild(form);

            // Create hidden input element for each data key
            for (var prop in settings.data) {
                if (settings.data.hasOwnProperty(prop)) {
                    var el = document.createElement("input");
                    el.setAttribute('type', 'hidden');
                    el.setAttribute('name', prop);
                    el.setAttribute('value', settings.data[prop]);
                    form.appendChild(el);
                }
            }
            return form;
        },
        /**
         * Gets response from iframe and fires onComplete event when ready
         * @param iframe
         * @param file Filename to use in onComplete callback
         */
        _getResponse: function (iframe, file) {
            // getting response
            var toDeleteFlag = false,
                self = this,
                settings = this._settings;

            addEvent(iframe, 'load', function () {

                if ( // For Safari
                iframe.src == "javascript:'%3Chtml%3E%3C/html%3E';" ||
                // For FF, IE
                iframe.src == "javascript:'<html></html>';") {
                    // First time around, do not delete.
                    // We reload to blank page, so that reloading main page
                    // does not re-submit the post.

                    if (toDeleteFlag) {
                        // Fix busy state in FF3
                        setTimeout(function () {
                            removeNode(iframe);
                        },
                        0);
                    }

                    return;
                }

                var doc = iframe.contentDocument ? iframe.contentDocument : window.frames[iframe.id].document;

                // fixing Opera 9.26,10.00
                if (doc.readyState && doc.readyState != 'complete') {
                    // Opera fires load event multiple times
                    // Even when the DOM is not ready yet
                    // this fix should not affect other browsers
                    return;
                }

                // fixing Opera 9.64
                if (doc.body && doc.body.innerHTML == "false") {
                    // In Opera 9.64 event was fired second time
                    // when body.innerHTML changed from false
                    // to server response approx. after 1 sec
                    return;
                }

                var response;

                if (doc.XMLDocument) {
                    // response is a xml document Internet Explorer property
                    response = doc.XMLDocument;
                } else if (doc.body) {
                    // response is html document or plain text
                    response = doc.body.innerHTML;

                    if (settings.responseType && settings.responseType.toLowerCase() == 'json') {
                        // If the document was sent as 'application/javascript' or
                        // 'text/javascript', then the browser wraps the text in a <pre>
                        // tag and performs html encoding on the contents.  In this case,
                        // we need to pull the original text content from the text node's
                        // nodeValue property to retrieve the unmangled content.
                        // Note that IE6 only understands text/html
                        if (doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == 'PRE') {
                            response = doc.body.firstChild.firstChild.nodeValue;
                        }

                        if (response) {
                            response = eval("(" + response + ")");
                        } else {
                            response = {};
                        }
                    }
                } else {
                    // response is a xml document
                    response = doc;
                }

                settings.onComplete.call(self, file, response);

                // Reload blank page, so that reloading main page
                // does not re-submit the post. Also, remember to
                // delete the frame
                toDeleteFlag = true;

                // Fix IE mixed content issue
                iframe.src = "javascript:'<html></html>';";
            });
        },
        /**
         * Upload file contained in this._input
         */
        submit: function () {
            var self = this,
                settings = this._settings;

            if (!this._input || this._input.value === '') {
                return;
            }

            var file = fileFromPath(this._input.value);

            // user returned false to cancel upload
            if (false === settings.onSubmit.call(this, file, getExt(file))) {
                this._clearInput();
                return;
            }

            // sending request
            var iframe = this._createIframe();
            var form = this._createForm(iframe);

            // assuming following structure
            // div -> input type='file'
            removeNode(this._input.parentNode);
            removeClass(self._button, self._settings.hoverClass);

            form.appendChild(this._input);

            form.submit();

            // request set, clean up
            removeNode(form);
            form = null;
            removeNode(this._input);
            this._input = null;

            // Get response from iframe and fire onComplete event when ready
            this._getResponse(iframe, file);

            // get ready for next request
            this._createInput();
        }
    };
})();