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这篇文章主要介绍了Ajax怎么上传文件到服务器的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇Ajax怎么上传文件到服务器文章都会有所收获，下面我们一起来看看吧。
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;
}
})关于“Ajax怎么上传文件到服务器”这篇文章的内容就介绍到这里，感谢各位的阅读！相信大家对“Ajax怎么上传文件到服务器”知识都有一定的了解，大家如果还想学习更多知识，欢迎关注亿速云行业资讯频道。
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