• AJAX上传文件到服务器


    上传文件是常要处理的事情,使用ajaxFileUpload.js处理比较方便,这里的ajaxFileUpload.js文件修改过的,

    Html部分

                             <input type="file" id="fu_UploadFile" name="fu_UploadFile" value="" title="上传附件">
                             <input type="button" value="上传" onclick="upload()" />  

    JS部分:

            function upload() {
                var path = document.getElementById("fu_UploadFile").value;
                if ($.trim(path) == "") { alert("请选择要上传的文件"); return; }
                console.log("test");
    
                var result_msg = "";
                $.ajaxFileUpload({
                    url: '/UpFile.ashx',  //这里是服务器处理的代码
                    type: 'post',
                    secureuri: false, //一般设置为false
                    fileElementId: 'fu_UploadFile', // 上传文件的id、name属性名
                    dataType: 'json', //返回值类型,一般设置为json、application/json
                    data: {}, //传递参数到服务器
                    success: function (data, status) {
                            if (data.Result) {
                                alert("文件成功处理完成!" + data.FileName);
                            } else {
                                alert("文件成功处理出错!原因:" + data.ErrorMessage);
                            }
                    },
                    error: function (data, status, e) {
                        alert("错误:上传组件错误,请检察网络!");
                    }
                });
            }

      服务器:

        /// <summary>
        /// UpFile 的摘要说明
        /// </summary>
        public class UpFile : IHttpHandler
        {
    
            public void ProcessRequest(HttpContext context)
            {
                context.Response.ContentType = "text/plain";
                UpFileResult result = new UpFileResult();
                try
                {
                    HttpPostedFile _upfile = context.Request.Files["fu_UploadFile"];
                if (_upfile == null)
                {
                    throw new Exception("请先选择文件!");
                }
                else
                {
                    string fileName = _upfile.FileName;/*获取文件名: C:Documents and SettingsAdministrator桌面123.jpg*/
                    string suffix = fileName.Substring(fileName.LastIndexOf(".") + 1).ToLower();/*获取后缀名并转为小写: jpg*/
                    int bytes = _upfile.ContentLength;//获取文件的字节大小  
                    //
                    if (!(suffix == "jpg" || suffix == "gif" || suffix == "png"|| suffix == "jpeg"))
                        throw new Exception("只能上传JPE,GIF,PNG文件");
                    if (bytes > 1024 * 1024*10)
                        throw new Exception("文件最大只能传10M");
                    string newfileName = DateTime.Now.ToString("yyyyMMddHHmmss");
                    string fileDir = HttpContext.Current.Server.MapPath("~/upfiles/");
                    if (!Directory.Exists(fileDir))
                    {
                        Directory.CreateDirectory(fileDir);
                    }
                    result.FileName = fileName;
    

                string saveDir = fileDir + newfileName + "." + suffix;
                result.FileURL = "~/upfiles/" + newfileName + "." + suffix;

    
                    _upfile.SaveAs(result.FileURL);//保存图片  
                      
                }
                }
                catch (System.Exception ex)
                {
                    result.Result = false;
                    result.ErrorMessage = ex.Message;
                }
                context.Response.Write(JsonHelper.SerializeObject(result));
     
            }
            public bool IsReusable
            {
                get
                {
                    return false;
                }
            }
    
            public class UpFileResult   //: AshxCommonResult
            {
                public bool Result { get; set; }
                public string ErrorMessage { get; set; }
                public string FileName { get; set; }
                public string FileURL { get; set; }
            }

    ajaxfileupload.js

    jQuery.extend({
        
        handleError: function (s, xhr, status, e) {
            // If a local callback was specified, fire it
            if (s.error) {
                s.error.call(s.context || s, xhr, status, e);
            }
            // Fire the global callback
            if (s.global) {
                (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
            }
        },
        createUploadIframe: function(id, uri)
        {
                //create frame
                var frameId = 'jUploadFrame' + id;
                var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
                if(window.ActiveXObject)
                {
                    if(typeof uri== 'boolean'){
                        iframeHtml += ' src="' + 'javascript:false' + '"';
    
                    }
                    else if(typeof uri== 'string'){
                        iframeHtml += ' src="' + uri + '"';
    
                    }    
                }
                iframeHtml += ' />';
                jQuery(iframeHtml).appendTo(document.body);
    
                return jQuery('#' + frameId).get(0);            
        },
    
        createUploadForm: function(id, fileElementId, data)
        {
            //create form    
            var formId = 'jUploadForm' + id;
            var fileId = 'jUploadFile' + id;
            var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');    
            if(data)
            {
                for(var i in data)
                {
                    jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
                }            
            }        
            var oldElement = jQuery('#' + fileElementId);
            var newElement = jQuery(oldElement).clone();
            jQuery(oldElement).attr('id', fileId);
            jQuery(oldElement).before(newElement);
            jQuery(oldElement).appendTo(form);
    
    
            
            //set attributes
            jQuery(form).css('position', 'absolute');
            jQuery(form).css('top', '-1200px');
            jQuery(form).css('left', '-1200px');
            jQuery(form).appendTo('body');        
            return form;
        },
    
        ajaxFileUpload: function(s) {
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout        
            s = jQuery.extend({}, jQuery.ajaxSettings, s);
            var id = new Date().getTime()        
            var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
            var io = jQuery.createUploadIframe(id, s.secureuri);
            var frameId = 'jUploadFrame' + id;
            var formId = 'jUploadForm' + id;        
            // Watch for a new set of requests
            if ( s.global && ! jQuery.active++ )
            {
                jQuery.event.trigger( "ajaxStart" );
            }            
            var requestDone = false;
            // Create the request object
            var xml = {}   
            if ( s.global )
                jQuery.event.trigger("ajaxSend", [xml, s]);
            // Wait for a response to come back
            var uploadCallback = function(isTimeout)
            {            
                var io = document.getElementById(frameId);
                try 
                {                
                    if(io.contentWindow)
                    {
                         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)
                    {
                         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") 
                {                
                    requestDone = true;
                    var status;
                    try {
                        status = isTimeout != "timeout" ? "success" : "error";
                        // 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 );    
                            // 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", [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()
    
                    setTimeout(function()
                                        {    try 
                                            {
                                                jQuery(io).remove();
                                                jQuery(form).remove();    
                                                
                                            } catch(e) 
                                            {
                                                jQuery.handleError(s, xml, null, e);
                                            }                                    
    
                                        }, 100)
    
                    xml = null
    
                }
            }
            // Timeout checker
            if ( s.timeout > 0 ) 
            {
                setTimeout(function(){
                    // Check to see if the request is still happening
                    if( !requestDone ) uploadCallback( "timeout" );
                }, s.timeout);
            }
            try 
            {
    
                var form = jQuery('#' + formId);
                jQuery(form).attr('action', s.url);
                jQuery(form).attr('method', 'POST');
                jQuery(form).attr('target', frameId);
                if(form.encoding)
                {
                    jQuery(form).attr('encoding', 'multipart/form-data');                  
                }
                else
                {    
                    jQuery(form).attr('enctype', 'multipart/form-data');            
                }            
                jQuery(form).submit();
    
            } catch(e) 
            {            
                jQuery.handleError(s, xml, null, e);
            }
            
            jQuery('#' + frameId).load(uploadCallback    );
            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" )
                var reg = /<pre.+?>(.+)</pre>/g;  
                var result = data.match(reg);  
                data = RegExp.$1;
                eval( "data = " + data );
            // evaluate scripts within html
            if ( type == "html" )
                jQuery("<div>").html(data).evalScripts();
    
            return data;
        }
    })
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  • 原文地址:https://www.cnblogs.com/KevinMO/p/7485737.html
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