ajaxFileUpload 无刷新上传的原理:
在页面动态创建 form 表单和 ifram 贞,设定 form 表单提交的目标为 ifram 贞,
将文件域和要 post 的参数动态写入 form 表单中,然后提交 from 表单。
通过 window.attachEvent 向 ifram 贞的 onload 事件中注册监听事件响应回调函数。
1.html 部分
- <input name="imgfile1" id="imgfile1" style="width:200px; height:25px;" size="38" type="file"/>
- <div id="imgContainer1"></div>
2.调用部分
- function uploadImg(imgfileId,imgcontainerId) {
- $.ajaxFileUpload({
- fileElementId: imgfileId,url: '/UploadImage',dataType: 'json',data: { id: 'aaa',name: 'bbb' },beforeSend: function (XMLHttpRequest) {
- //("loading");
- },success: function (data,textStatus) {
- var img = "<img src='' width='300' height='300' />";
- $("#" + imgcontainerId).append(img);
- },error: function (XMLHttpRequest,textStatus,errorThrown) {
- var img = "图片上传失败!";
- $("#" + imgcontainerId).append(img);
- var msg = "服务器出错,错误内容:" + XMLHttpRequest.responseText;
- $.messager.showWin({ msg: msg,title: '错误提示',color: 'red' });
- },complete: function (XMLHttpRequest,textStatus) {
- //("loaded");
- }
- });
- }
3.ajaxFileUpload.js 全部代码
本文转自: http://www.jb51.cc/article/p-sucqxphf-ua.html
- /*
- 131108-xxj-ajaxFileUpload.js 无刷新上传图片 jquery 插件,支持 ie6-ie10
- 依赖:jquery-1.6.1.min.js
- 主方法:ajaxFileUpload 接受 json 对象参数
- 参数说明:
- fileElementId:必选,上传文件域ID
- url:必选,发送请求的URL字符串
- fileFilter:可选,限定上传文件的格式(.jpg,.bmp,.gif,.png)
- fileSize:可选,0 为无限制(IE浏览器不兼容)
- data:可选,将和文件域一同post的参数(json对象)
- 其它:$.ajax 的参数均为可选参数
- 注:如遇到‘无法访问’的脚本错误提示则需要在响应流中加一段脚块一同输出:<script ...>document.domain = 'xxx.com';</script>
- */
- jQuery.extend({
- //创建 iframe 元素,接受提交及响应
- createUploadIframe: function(id,uri) {
- //create frame
- var frameId = 'jUploadFrame' + id;
- if (window.ActiveXObject) {
- //fix ie9 and ie 10-------------
- if (jQuery.browser.version == "9.0" || jQuery.browser.version == "10.0") {
- var io = document.createElement('iframe');
- io.id = frameId;
- io.name = frameId;
- } else if (jQuery.browser.version == "6.0" || jQuery.browser.version == "7.0" || jQuery.browser.version == "8.0") {
- var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
- if (typeof uri == 'boolean') {
- io.src = 'javascript:false';
- } else if (typeof uri == 'string') {
- io.src = uri;
- }
- }
- } else {
- var io = document.createElement('iframe');
- io.id = frameId;
- io.name = frameId;
- }
- io.style.position = 'absolute';
- io.style.top = '-1000px';
- io.style.left = '-1000px';
- document.body.appendChild(io);
- return io;
- },//创建 from 元素,用于提交的表单
- createUploadForm: function(id,fileElementId,postData) {
- //create form<span style="white-space:pre"> </span>
- var formId = 'jUploadForm' + id;
- var fileId = 'jUploadFile' + id;
- var form = $('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
- var oldElement = $('#' + fileElementId);
- var newElement = $(oldElement).clone();
- $(oldElement).attr('id',fileId);
- $(oldElement).before(newElement);
- $(oldElement).appendTo(form);
- //添加自定义参数
- if (postData) {
- //递归遍历JSON所有键值
- function recurJson(json) {
- for (var i in json) {
- //alert(i+"="+json[i])
- $("<input name='" + i + "' id='" + i + "' value='" + json[i] + "' />").appendTo(form);
- if (typeof json[i] == "object") {
- recurJson(json[i]);
- }
- }
- }
- recurJson(postData);
- }
- //set attributes
- $(form).css('position','absolute');
- $(form).css('top','-1200px');
- $(form).css('left','-1200px');
- $(form).appendTo('body');
- return form;
- },//上传文件
- //s 参数:json对象
- ajaxFileUpload: function(s) {
- s = jQuery.extend({fileFilter:"",fileSize:0},jQuery.ajaxSettings,s);
- //文件筛选
- var fielName = $('#' + s.fileElementId).val();
- var extention = fielName.substring(fielName.lastIndexOf(".") + 1).toLowerCase();
- if (s.fileFilter && s.fileFilter.indexOf(extention) < 0) {
- alert("仅支持 (" + s.fileFilter + ") 为后缀名的文件!");
- return;
- }
- //文件大小限制
- if (s.fileSize > 0) {
- var fs = 0;
- try {
- if (window.ActiveXObject) {
- //IE浏览器
- var image = new Image();
- image.dynsrc = fielName;
- fs = image.fileSize;
- } else {
- fs = $('#' + s.fileElementId)[0].files[0].size;
- }
- } catch(e) {
- }
- if (fs > s.fileSize) {
- alert("当前文件大小 (" + fs + ") 超过允许的限制值 (" + s.fileSize +")!");
- return;
- }
- }
- var id = new Date().getTime();
- //创建 form 表单元素
- var form = jQuery.createUploadForm(id,s.fileElementId,s.data);
- //创建 iframe 贞元素
- var io = jQuery.createUploadIframe(id,s.secureuri);
- var frameId = 'jUploadFrame' + id;
- var formId = 'jUploadForm' + id;
- //监测是否有新的请求
- if (s.global && !jQuery.active++) {
- jQuery.event.trigger("ajaxStart"); //触发 AJAX 请求开始时执行函数。Ajax 事件。
- }
- var requestDone = false;
- //创建请求对象
- var xml = {};
- if (s.global)
- jQuery.event.trigger("ajaxSend",[xml,s]); //触发 AJAX 请求发送前事件
- //上载完成的回调函数
- var uploadCallback = function(isTimeout) {
- var io = document.getElementById(frameId);
- try {
- //存在跨域脚本访问问题,如遇到‘无法访问’提示则需要在响应流中加一段脚块:<script ...>document.domain = 'xxx.com';</script>
- if (io.contentWindow) { //兼容各个浏览器,可取得子窗口的 window 对象
- xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
- xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;
- } else if (io.contentDocument) { //contentDocument Firefox 支持,> ie8 的ie支持。可取得子窗口的 document 对象。
- xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
- xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
- }
- } catch(e) {
- jQuery.handleErrorExt(s,xml,null,e);
- }
- if (xml || isTimeout == "timeout") {
- requestDone = true;
- var status;
- try {
- status = isTimeout != "timeout" ? "success" : "error";
- // Make sure that the request was successful or notmodified
- if (status != "error") {
- //处理数据(运行XML通过httpData不管回调)
- var data = jQuery.uploadHttpData(xml,s.dataType);
- // If a local callback was specified,fire it and pass it the data
- if (s.success)
- s.success(data,status);
- // Fire the global callback
- if (s.global)
- jQuery.event.trigger("ajaxSuccess",s]);
- } else
- jQuery.handleErrorExt(s,status);
- } catch(e) {
- status = "error";
- jQuery.handleErrorExt(s,status,e);
- }
- // The request was completed
- if (s.global)
- jQuery.event.trigger("ajaxComplete",s]);
- // Handle the global AJAX counter
- if (s.global && !--jQuery.active)
- jQuery.event.trigger("ajaxStop");
- // Process result
- if (s.complete)
- s.complete(xml,status);
- jQuery(io).unbind();
- setTimeout(function() {
- try {
- $(io).remove();
- $(form).remove();
- } catch(e) {
- jQuery.handleErrorExt(s,e);
- }
- },100);
- xml = null;
- }
- };
- //超时检查,s.timeout 毫秒后调用 uploadCallback 回调函数提示请求超时
- if (s.timeout > 0) {
- setTimeout(function() {
- // Check to see if the request is still happening
- if (!requestDone) uploadCallback("timeout");
- },s.timeout);
- }
- try {
- //设置动态 form 表单的提交参数
- // var io = $('#' + frameId);
- var form = $('#' + formId);
- $(form).attr('action',s.url);
- $(form).attr('method','POST');
- $(form).attr('target',frameId);
- if (form.encoding) {
- form.encoding = 'multipart/form-data';
- } else {
- form.enctype = 'multipart/form-data';
- }
- $(form).submit();
- } catch(e) {
- jQuery.handleErrorExt(s,e);
- }
- //向动态表单的页面加载事件中注册回调函数
- if (window.attachEvent) {
- document.getElementById(frameId).attachEvent('onload',uploadCallback);
- } else {
- document.getElementById(frameId).addEventListener('load',uploadCallback,false);
- }
- return {
- abort: function() {
- }
- };
- },//上传文件
- uploadHttpData: function(r,type) {
- //alert("type=" + type + ";uploadHttpData" + JSON.stringify(r))
- var data = !type;
- data = type == "xml" || data ? r.responseXML : r.responseText;
- // If the type is "script",eval it in global context
- if (type == "script")
- jQuery.globalEval(data);
- // Get the JavaScript object,if JSON is used.
- if (type == "json")
- eval("data = " + data);
- // evaluate scripts within html
- if (type == "html")
- jQuery("<div>").html(data).evalScripts();
- //alert($('param',data).each(function(){alert($(this).attr('value'));}));
- return data;
- },handleErrorExt: function(s,xhr,e) {
- // If a local callback was specified,fire it
- if (s.error) {
- s.error.call(s.context || s,e);
- }
- // Fire the global callback
- if (s.global) {
- (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError",[xhr,s,e]);
- }
- }
- });