Home >Web Front-end >JS Tutorial >Detailed explanation of usage examples of ajaxfileupload.js
In web applications, it is generally used to upload files or pictures to the server, then you can use ajaxfileupload.js, but when using ajaxfileupload.js, when the json returned by the server contains &
symbol, all &
in the returned data are escaped into &
.
The ajaxfileupload.js below is a modified file upload library.
jQuery.extend({/** createUploadIframe 创建上传的iframe * @param id 传递当前系统的时间字符串 * @param uri 传入的json对象的一个参数 * */createUploadIframe: function (id, uri) {//iframe添加一个idvar frameId = 'jUploadFrame' + id;//创建iframe元素var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';if (window.ActiveXObject) {//判断浏览器是否支持ActiveX控件if (typeof uri == 'boolean') {//阻止提交数据iframeHtml += ' src="' + 'javascript:false' + '"'; }else if (typeof uri == 'string') { iframeHtml += ' src="' + uri + '"'; } } iframeHtml += ' />';//将动态iframe追加到body中 jQuery(iframeHtml).appendTo(document.body);//返回iframe对象return jQuery('#' + frameId).get(0); },/** createUploadForm 创建form * @param id 当前系统时间字符串 * @param fileElementId 为页面input type='file'的id * @param data 向服务器传递的值 如 data:{key1:value1,key2:value2} * */createUploadForm: function (id, fileElementId, data) {//给form添加idvar formId = 'jUploadForm' + id;//给type为file的上传按钮添加idvar fileId = 'jUploadFile' + id;//创建form元素var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data" ></form>');if (data) {for (var i in data) {//根据data提交的数据,创建隐藏域jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form); } }//得到页面中的<input type='file' />对象if (typeof(fileElementId) == 'string') { fileElementId = fileElementId.split(','); }for (var i=0,j = fileElementId.length;i < j; i++) { var oldElement = jQuery('#' + fileElementId[i]); //克隆页面中的<input type='file' />对象 var newElement = jQuery(oldElement).clone(true); //修改原对象的id jQuery(oldElement).attr('id', fileId); //在原对象前插入克隆对象 jQuery(oldElement).before(newElement); //把原对象插入到动态form的结尾处 jQuery(oldElement).appendTo(form); } //给动态form添加样式jQuery(form).css('position', 'absolute'); jQuery(form).css('top', '-1200px'); jQuery(form).css('left', '-1200px'); jQuery(form).appendTo('body');return form; },/** ajaxFileUpload ajax上传请求 * @param s 传入一些ajax的参数 * */ajaxFileUpload: function (s) { s = jQuery.extend({}, jQuery.ajaxSettings, s);var id = new Date().getTime();//创建动态formvar form = jQuery.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data));//创建动态iframe s.secureuri 是否需要安全协议,一般置为falsevar io = jQuery.createUploadIframe(id, s.secureuri);//动态iframe的idvar frameId = 'jUploadFrame' + id;//动态form的idvar formId = 'jUploadForm' + id;//当jQuery开始一个ajax请求时发生,global表示是否触发全局ajax事件,默认是true;if (s.global && !jQuery.active++) {//触发ajaxStart方法jQuery.event.trigger("ajaxStart"); }//请求完成标志var requestDone = false;// 创建请求对象var xml = {};if (s.global){//触发ajaxSend方法jQuery.event.trigger("ajaxSend", [xml, s]); }//回调函数var uploadCallback = function (isTimeout) {//得到iframe对象var io = document.getElementById(frameId);try {//动态iframe所在窗口对象是否存在if (io.contentWindow) {if(s.dataType=='text'){ xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.textContent : null; }else{ 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; }//动态iframe的文档对象是否存在else if (io.contentDocument) {if(s.dataType=='text'){ xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.textContent : null; }else{ xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null; } 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.handleError(s, xml, null, e); }//xml变量被赋值或者isTimeout == "timeout"都表示请求发出,并且有响应if (xml || isTimeout == "timeout") {//请求完成requestDone = true;var status;try {//如果不是“超时”,表示请求成功status = isTimeout != "timeout" ? "success" : "error";// Make sure that the request was successful or notmodifiedif (status != "error") {// process the data (runs the xml through httpData regardless of callback)var data = jQuery.uploadHttpData(xml, s.dataType);// If a local callback was specified, fire it and pass it the dataif (s.success){//执行上传成功的操作 s.success(data, status); }// Fire the global callbackif (s.global){ jQuery.event.trigger("ajaxSuccess", [xml, s]); } } else{ jQuery.handleError(s, xml, status); } }catch (e) { status = "error"; jQuery.handleError(s, xml, status, e); }if (s.global){// The request was completedjQuery.event.trigger("ajaxComplete", [xml, s]); }if (s.global && ! --jQuery.active){ jQuery.event.trigger("ajaxStop"); }if (s.complete){ s.complete(xml, status); }//移除iframe的事件处理程序 jQuery(io).unbind(); setTimeout(function () {//设置超时时间try {//移除动态iframe与动态form jQuery(io).remove(); jQuery(form).remove(); }catch (e) { jQuery.handleError(s, xml, null, e); } }, 100) xml = null} }//超时检测if (s.timeout > 0) { setTimeout(function () {//如果请求仍未完成,就发送超时信号if (!requestDone) uploadCallback("timeout"); }, s.timeout); }try {var form = jQuery('#' + formId); jQuery(form).attr('action', s.url);//传入的ajax页面导向urljQuery(form).attr('method', 'POST');//设置提交表单方式jQuery(form).attr('target', frameId);//返回的目标iframe,就是创建的动态iframeif (form.encoding) {//选择编码方式jQuery(form).attr('encoding', 'multipart/form-data'); }else { jQuery(form).attr('enctype', 'multipart/form-data'); } jQuery(form).submit();//提交form表单}catch (e) { jQuery.handleError(s, xml, null, e); } jQuery('#' + frameId).load(uploadCallback); //ajax 请求从服务器加载数据,同时传入回调函数return { abort: function () { } }; }, uploadHttpData: function (r, type) {var data = !type;// If the type is "script", eval it in global contextdata = type == "xml" || data ? r.responseXML : r.responseText;if (type == "script"){ jQuery.globalEval(data); }// Get the JavaScript object, if JSON is used.if (type == "json"){ eval("data = " + data); }if (type == "html"){ jQuery("<div>").html(data).evalScripts(); }return data; }, handleError: function( s, xhr, status, e ){// If a local callback was specified, fire itif ( s.error ) { s.error.call( s.context || s, xhr, status, e ); }// Fire the global callbackif ( s.global ) { (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] ); } } })
The following is the calling method:
$.ajaxFileUpload({ url: 'ps.php',//一般设置为falsesecureuri: false, data:{ email:email },//文件上传控件的id属性fileElementId: $("input#xxx").attr("id"), //返回值类型 一般设置为json,但是如果返回的数据有&等特殊符号,这儿改成textdataType: 'text', success: function (data, status) {//如果dataType为text,那么这儿需要把返回的字符串转成对象data = JSON.parse(data); }, error: function (data, status, e){ console.log(e); } })
Note: If there is an & symbol returned, change the dataType to text, and then return the data Strings are processed via JSON.parse().
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