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  • jQuery插件之ajaxFileUpload

    1. [代码]ajaxfileupload.js     跳至 [1] [2] [全屏预览]

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    jQuery.extend({
        createUploadIframe: function (id, uri) {//id为当前系统时间字符串,uri是外部传入的json对象的一个参数
            //create frame
            var frameId = 'jUploadFrame' + id; //给iframe添加一个独一无二的id
            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"'; //创建iframe元素
            if (window.ActiveXObject) {//判断浏览器是否支持ActiveX控件
                if (typeof uri == 'boolean') {
                    iframeHtml += ' src="' + 'javascript:false' + '"';
                }            else if (typeof uri == 'string') {
                    iframeHtml += ' src="' + uri + '"';
                }
            }
            iframeHtml += ' />';
            jQuery(iframeHtml).appendTo(document.body); //将动态iframe追加到body中
            return jQuery('#' + frameId).get(0); //返回iframe对象
        },
        createUploadForm: function (id, fileElementId, data) {//id为当前系统时间字符串,fileElementId为页面<input type='file' />的id,data的值需要根据传入json的键来决定
            //create form   
            var formId = 'jUploadForm' + id; //给form添加一个独一无二的id
            var fileId = 'jUploadFile' + id; //给<input type='file' />添加一个独一无二的id
            var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data" ></form>'); //创建form元素
            if (data) {//通常为false
                for (var i in data) {
                    jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form); //根据data的内容,创建隐藏域,这部分我还不知道是什么时候用到。估计是传入json的时候,如果默认传一些参数的话要用到。
                }
            }        var oldElement = jQuery('#' + fileElementId); //得到页面中的<input type='file' />对象
            var newElement = jQuery(oldElement).clone(); //克隆页面中的<input type='file' />对象
            jQuery(oldElement).attr('id', fileId); //修改原对象的id
            jQuery(oldElement).before(newElement); //在原对象前插入克隆对象
            jQuery(oldElement).appendTo(form); //把原对象插入到动态form的结尾处
            //set attributes
            jQuery(form).css('position', 'absolute'); //给动态form添加样式,使其浮动起来,
            jQuery(form).css('top', '-1200px');
            jQuery(form).css('left', '-1200px');
            jQuery(form).appendTo('body'); //把动态form插入到body中
            return form;
        },
        ajaxFileUpload: function (s) {//这里s是个json对象,传入一些ajax的参数
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout       
            s = jQuery.extend({}, jQuery.ajaxSettings, s); //此时的s对象是由jQuery.ajaxSettings和原s对象扩展后的对象
            var id = new Date().getTime(); //取当前系统时间,目的是得到一个独一无二的数字
            var form = jQuery.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data)); //创建动态form
            var io = jQuery.createUploadIframe(id, s.secureuri); //创建动态iframe
            var frameId = 'jUploadFrame' + id; //动态iframe的id
            var formId = 'jUploadForm' + id; //动态form的id
            // Watch for a new set of requests
            if (s.global && !jQuery.active++) {//当jQuery开始一个ajax请求时发生
                jQuery.event.trigger("ajaxStart"); //触发ajaxStart方法
            }        var requestDone = false; //请求完成标志
            // Create the request object
            var xml = {};        if (s.global)
                jQuery.event.trigger("ajaxSend", [xml, s]); //触发ajaxSend方法
            // Wait for a response to come back
            var uploadCallback = function (isTimeout) {//回调函数
                var io = document.getElementById(frameId); //得到iframe对象
                try {                if (io.contentWindow) {//动态iframe所在窗口对象是否存在
                        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) {//动态iframe的文档对象是否存在
                        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);
                }            if (xml || isTimeout == "timeout") {//xml变量被赋值或者isTimeout == "timeout"都表示请求发出,并且有响应
                    requestDone = true; //请求完成
                    var status;                try {
                        status = isTimeout != "timeout" ? "success" : "error"; //如果不是“超时”,表示请求成功
                        // Make sure that the request was successful or notmodified
                        if (status != "error") {                        // process the data (runs the xml through httpData regardless of callback)
                            var data = jQuery.uploadHttpData(xml, s.dataType); //根据传送的type类型,返回json对象,此时返回的data就是后台操作后的返回结果
                            // If a local callback was specified, fire it and pass it the data
                            if (s.success)
                                s.success(data, status); //执行上传成功的操作
                            // Fire the global callback
                            if (s.global)
                                jQuery.event.trigger("ajaxSuccess", [xml, s]);
                        } else
                            jQuery.handleError(s, xml, status);
                    } catch (e) {
                        status = "error";
                        jQuery.handleError(s, xml, status, e);
                    }                // The request was completed
                    if (s.global)
                        jQuery.event.trigger("ajaxComplete", [xml, 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();//移除iframe的事件处理程序
                    setTimeout(function () {//设置超时时间
                        try {
                            jQuery(io).remove();//移除动态iframe
                            jQuery(form).remove();//移除动态form
                        } catch (e) {
                            jQuery.handleError(s, xml, null, e);
                        }
                    }, 100)
                    xml = null
                }
            }        // Timeout checker
            if (s.timeout > 0) {//超时检测
                setTimeout(function () {                // Check to see if the request is still happening
                    if (!requestDone) uploadCallback("timeout");//如果请求仍未完成,就发送超时信号
                }, s.timeout);
            }        try {            var form = jQuery('#' + formId);
                jQuery(form).attr('action', s.url);//传入的ajax页面导向url
                jQuery(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iframe
                if (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;
            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();        return data;
        }
    })

    2. [代码]使用ajaxfileupload.js插件的大致方法     

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    $.ajaxFileUpload
    (
        {
            url: '../../XXXX/XXXX.aspx', //用于文件上传的服务器端请求地址
            secureuri: false,           //一般设置为false
            fileElementId: $("input#xxx").attr("id"), //文件上传控件的id属性  <input type="file" id="file" name="file" /> 注意,这里一定要有name值  
                                                    //$("form").serialize(),表单序列化。指把所有元素的ID,NAME 等全部发过去
            dataType: 'json',//返回值类型 一般设置为json
            complete: function () {//只要完成即执行,最后执行
            },
            success: function (data, status)  //服务器成功响应处理函数
            {            if (typeof (data.error) != 'undefined') {                if (data.error != '') {                    if (data.error == "1001") {//这个error(错误码)是由自己定义的,根据后台返回的json对象的键值而判断
                        }                    else if (data.error == "1002") {
                        }
                        alert(data.msg);//同error
                        return;
                    } else {
                        alert(data.msg);
                    }
                }            /*                *    这里就是做一些其他操作,比如把图片显示到某控件中去之类的。                */
            },
            error: function (data, status, e)//服务器响应失败处理函数
            {
                alert(e);
            }
        }
    )

    3. [图片] QQ20150806-1.png    

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  • 原文地址:https://www.cnblogs.com/liangxiaofeng/p/5825653.html
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