jquery插件ajaxupload实现文件上传操作

作者：pan_junbiao 字体：[增加 减小] 类型：转载 时间：2015-12-09 我要评论

这篇文章主要介绍了jquery插件ajaxupload实现文件上传操作，感兴趣的小伙伴们可以参考一下

本文实例讲述了jquery插件ajaxupload实现文件上传操作代码。分享给大家供大家参考。具体如下：
运行效果截图如下：

图1 文件上传前

图2 文件上传后

具体代码如下：

1、创建页面并编写HTML

上传文档: 

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<divclass="uploadFile">

  <spanid="doc"><inputtype="text"disabled="disabled"/></span>

  <inputtype="hidden"id="hidFileName"/>

  <inputtype="button"id="btnUploadFile"value="上传"/>

  <inputtype="button"id="btnDeleteFile"value="删除"/>

</div>

上传图片: 

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<divclass="uploadImg">

  <imgid="imgShow"src="/images/nophoto.gif"/>

  <inputtype="hidden"id="hidImgName"/>

  <inputtype="button"id="btnUploadImg"value="上传"/>

  <inputtype="button"id="btnDeleteImg"value="删除"/>

</div>

2、引用AjaxUpload.js文件

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

3、编写JS脚本

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window.onload = function() {

  init();//初始化

}

  

//初始化

function init() {

  //初始化文档上传

  varbtnFile = document.getElementById("btnUploadFile");

  vardoc = document.getElementById("doc");

  varhidFileName = document.getElementById("hidFileName");

  document.getElementById("btnDeleteFile").onclick =function() { DelFile(doc, hidFileName); };

  g_AjxUploadFile(btnFile, doc, hidFileName);

    

  //初始化图片上传

  varbtnImg = document.getElementById("btnUploadImg");

  varimg = document.getElementById("imgShow");

  varhidImgName = 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) {

  varbutton = btn, interval;

  newAjaxUpload(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！");

        returnfalse;

      }

    },

    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！");

      }

      elseif (flagValue == "2") {

        alert("您上传的文档大于2M，请重新选择！");

      }

      elseif (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) {

  varbutton = btn, interval;

  newAjaxUpload(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！");

        returnfalse;

      }

    },

    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！");

      }

      elseif (flagValue == "2") {

        alert("您上传的图片大于200K，请重新选择！");

      }

      elseif (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

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<%@ 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>

  /// <paramname="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>

  /// <paramname="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>

  /// <paramname="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

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/*上传文件*/

.uploadFile{margin-bottom:10px;}

/*上传图片*/

.uploadImg{}

.uploadImg img{width:102px;height:64px;border:1pxsolid #CCCCCC;display: block;}

附件2：AjaxUpload.js文件

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/**

 * 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

   */

  

  functionlog() {

    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) {

      thrownew 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;

  

      varnodeName = 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 changeif 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 () {

      varself = 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 sometimesreturn

      // same value in safari :(

      varid = 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);            

  

      variframe = 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 codein 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          

      varform = 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 () {

      varself = this,

        settings =this._settings;

  

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

        return;

      }

  

      varfile = fileFromPath(this._input.value);

  

      // user returned false to cancel upload

      if(false === settings.onSubmit.call(this, file, getExt(file))) {

        this._clearInput();

        return;

      }

  

      // sending request  

      variframe = this._createIframe();

      varform = 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();

    }

  };

})();

以上就是ajaxupload实现文件上传操作的详细代码，希望对大家的学习有所帮助。