ajax图片上传，图片异步上传，更新实例

ajax图片上传，图片异步上传，更新实例

最近在研究ajax图片上传，图片异步上传，更新，留作参考。

直接上源码吧：

js源码：

///

///

/*!

* jQuery upload

* 用于上传单个文件，上传成功后,返回文件路径。

* 本插件依赖jQuery，jquery.form 请在使用时引入依赖的文件

*

* Date: 2014/4/23

*/

/*

js:

$(document).ready(function () {

//$(".upload").upload({

// uploadData: { id: "12233" },

// successFn: function (response, statusText, xhr, $this) {

// alert(response.Data.RelativePath)

// },

// deleteData: { id: function () { return "asdfasdf" } }

//});

$(".upload").upload({

uploadData: { id: "12233" },

successFn: "success", //可以是字符串

deleteData: { id: function () { return "asdfasdf" } }

});

});

//上传成功后执行该函数

function success(response, statusText, xhr, $this) {

//比如插入编辑器

alert(response.Data.RelativePath + $this.attr("value"))

}

*/

(function ($) {

$.extend($.fn, {

upload: function (settings) {

var options = $.extend({

fileType: "gif|jpg|jpeg|png|bmp", //允许的文件格式

uploadUrl: "/ajax/handler.ashx?action=uploadfile", //上传URL地址

deleteUrl: "/ajax/handler.ashx?action=deletefile", //删除URL地址

width: "", //图片显示的宽度

height: 100, //图片显示的高度

imgSelector: ".imgdiv", //图片选择器

uploadData: {}, //上传时需要附加的参数

deleteData: {}, //删除时需要附加的参数

deleteFn: function ($parent, showMessage) { //删除图片的方法(默认方法使用POST提交)

methods.deleteImage($parent, showMessage);

},

beforeSubmitFn: "beforeUpload", //上传前执行的方法 原型 beforeSubmit(arr, $form, options);

successFn: "uploadSuccess", //上传成功后执行的方法 uploadSuccess(response, statusText, xhr, $this)

errorFn: "uTBBIJgZploadError" //上传失败后执行的方法

}, settings);

//上传准备函数

var methods = {

//验证文件格式

checkFile: function (filename) {

var pos = filename.lastIndexOf(".");

var str = filename.substring(pos, filename.length);

var str1 = str.toLowerCase();

if (typeof options.fileType !== 'string') { options.fileType = "gif|jpg|jpeg|png|bmp"; }

var re = new RegExp("\.(" + options.fileType + ")$");

return re.test(str1);

},

//创建表单

createForm: function () {

var $form = document.createElement("form");

$form.action = options.uploadUrl;

$form.method = "post";

$form.enctype = "multipart/form-data";

$form.style.display = "none";

//将表单加当document上，

document.body.appendChild($form); //创建表单后一定要加上这句否则得到的form不能上传。document后要加上body,否则火狐下不行。

return $($form);

},

//创建图片

createImage: function () {

//不能用 new Image() 来创建图片，否则ie下不能改变img 的宽高

var img = $(document.createElement("img"));

img.attr({ "title": "双击图片可删除图片！" });

if (options.width !== "") {

img.attr({ "width": options.width });

}

if (options.height !== "") {

img.attr({ "height": options.height });

}

return img;

},

showImage: function (filePath, $parent) {

var $img = methods.createImage();

$parent.find(options.imgSelector).find("img").remove();

//要先append再给img赋值，否则在ie下不能缩小宽度。

$img.appendTo($parent.find(options.imgSelector));

$img.attr("src", filePath);

this.bindDelete($parent);

},

bindDelete: function ($parent) {

$parent.find(options.imgSelector).find("img").bind("dblclick", function () {

options.deleteFn($parent, true);

});

},

deleteImage: function ($parent, showMessage) {

var $fileInput = $parent.find("input:hidden");

if ($fileInput.val() !== "") {

var data = $.extend(options.deleteData, { filePath: $fileInput.val(), t: Math.random() });

$.post(options.deleteUrl, data, function (response) {

if (showMessage) { alert(response.MessageContent) }

if (response.MessageType == 1) {

$fileInput.val("");

$parent.find(options.imgSelector).find("img").remove();

}

}, "JSON");

}

},

onload: function ($parent) {

var hiddenInput = $parent.find("input:hidden");

if (typeof hiddenInput !== "undefined" && hiddenInput.val() !== "") {

var img = methods.createImage();

if ($parent.find(options.imgSelector).find("img").length > 0) { $parent.find(options.imgSelector).find("img").remove(); }

//要先append再给img赋值，否则在ie下不能缩小宽度。

img.appendTo($parent.find(options.imgSelector));

img.attr("src", hiddenInput.val());

methods.bindDelete($parent);

}

}

};

//上传主函数

this.each(function () {

var $this = $(this);

methods.onload($this.parent());

$this.bind("click", function () {

var $fileInput = $(this).parent().find("input:file");

var fileBox = $fileInput.parent();

if ($fileInput.val() === "") {

alert("请选择要上传的图片！");

return false;

}

//验证图片

if (!methods.checkFile($fileInput.val())) {

alert("文件格式不正确，只能上传格式为：" + options.fileType + "的文件。");

return false;

}

//若隐藏域中有图片，先删除图片

if ($fileInput.val() !== "") {

options.deleteFn($this.parent(), false);

//methods.deleteImage($this.parent(), false);

}

//创建表单

var $form = methods.createForm();

//把上传控件附加到表单

$fileInput.appendTo($form);

fileBox.html(" 正在上传... ");

$this.attr("disabled", true);

//构建ajaxSubmit参数

var data = {};

data.data = options.uploadData;

data.type = "POST";

data.dataType = "JSON";

//上传前

data.beforeSubmit = function (arr, $form, options) {

var beforeSubmitFn;

try { beforeSubmitFn = eval(options.beforeSubmitFn) } catch (err) { };

if (beforeSubmitFn) {

var $result = beforeSubmitFn(arr, $form, options);

if (typeof ($result) == "boolean")

return $result;

}

};

//上传失败

data.error = function (response, statusText, xhr, $form) {

var errorFn;

try { errorFn = eval(options.errorFn) } catch (err) { };

if (errorFn) {

errorFn(response.responseText, statusText, xhr, $this);

}

};

//上传成功

data.success = function (response, statusText, xhr, $form) {

//response = eval("(" + response + ")");

if (response.MessageType == 1) {

methods.showImage(response.Data.RelativePath, $this.parent());

$this.parent().find("input:hidden").val(response.Data.RelativePath);

var successFn;

try { successFn = eval(options.successFn) } catch (err) { };

if (successFn) {

$.ajaxSetup({ cache: false });//这个不能少，否则ie下会提示下载

successFn(response, statusText, xhr, $this);

}

} else {

alert(response.MessageContent);

}

$this.attr("disabled", false);

fileBox.html("");

$form.remove();

};

try {

//开始ajax提交表单

$form.ajaxSubmit(data);

} catch (e) {

alert(e.message);

}

});

});

}

});

})(jQuery)

html代码：

服务器端使用一般处理程序：

public void ProcessRequest(HttpContext context)

{

context.Response.ContentType = "application/json";

var action = context.Request.QueryString.Get("action").ToLower();

var response = new JsonResult(StatusMessageType.Error, "没有权限或无效请求。").ToJson();

switch (action)

{

case "uploadfile":

if (context.Request.Files.Count > 0)

response = UploadFile(context.Request);

break;

case "deletefile":

response = DeleteFile(context.Request.Form);

break;

default:

break;

}

context.Response.Write(response);

}

///

///

///

///

///

private string UploadFile(HttpRequest request)

{

if (request.Files.Count == 0)

return new JsonResult(StatusMessageType.Error, "没有可处理的数据。").ToJson();

var id = request.Form.Get("id", "");

var file = request.Files[0];

if (file == null || file.ContentLength <= 0 || string.IsNullOrEmpty(file.FileName))

return new JsonResult(StatusMessageType.Error, "没有可处理的数据。").ToJson();

//IStoreFile storeFile = null;

string[] datePaths = new string[] { "~/uploads/" };

datePaths = datePaths.Union(DateTime.Now.ToString("yyyy-MM-dd").Split('-')).ToArray();

var relativePath = storeProvider.JoinDirectory(datePaths);

var dirPath = HttpContext.Current.Server.MapPath(relativePath);

if (!System.IO.Directory.Exists(dirPath))

System.IO.Directory.CreateDirectory(dirPath);

var fileName = GenerateFileName(Path.GetExtension(file.FileName));

var filePath = Path.Combine(dirPath, fileName);

file.SaveAs(filePath);

return new JsonResult(StatusMessageType.Success, "上传成功。", new

{

RelativePath = WebUtility.ResolveUrl(Path.Combine(relativePath, fileName)),

Size = file.ContentLength,

Id = id,

}).ToJson();

}

public string DeleteFile(NameValueCollection form)

{

var filePath = form.Get("filePath", "").Trim();

if (string.IsNullOrEmpty(filePath))

return new JsonResult(StatusMessageType.Error, "无效提交。").ToJson();

try

{

if (System.IO.File.Exists(HttpContext.Current.Server.MapPath(filePath)))

{

System.IO.File.Delete(HttpContext.Current.Server.MapPath(filePath));

return new JsonResult(StatusMessageType.Success, "文件删除成功。").ToJson();

}

else

{

return new JsonResult(StatusMessageType.Success, "找不到该文件。").ToJson();

}

}

catch (Exception)

{

return new JsonResult(StatusMessageType.Hint, "发生错误。").ToJson();

}

}

///

/// 生成随机文件名

///

///

private string GenerateFileName(string extension)

{

return DateTime.Now.Ticks.ToString() + extension;

}

程序使用的是framework4.0，所以使用了一些扩展方法。

JsonTesult类代码：

[Serializable]

public class JsonResult

{

private StatusMessageType _messageType;

private string _messageContent;

///

///

///

///

///

///

public JsonResult(StatusMessageType messageType, string messageContent, object data = null)

{

_messageType = messageType;

TBBIJgZ_messageContent = messageContent;

Data = data;

}

public StatusMessageType MessageType

{

get { return _messageType; }

set { _messageType = value; }

}

public string MessageContent

{

get { return _messageContent; }

set { _messageContent = value; }

}

public object Data { get; set; }

public string ToJson()

{

javaScriptSerializer serializer = new JavaScriptSerializer();

var json = serializer.Serialize(this);

//string p = @"\\/Date(\d+)\\/";

//MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);

//Regex reg = new Regex(p);

//json = reg.Replace(json, matchEvaluator);

return json;

}

private static string ConvertJsonDateToDateString(Match m)

{

string result = string.Empty;

DateTime dt = new DateTime(1970, 1, 1);

dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));

dt = dt.ToLocalTime();

result = dt.ToString("d");

return result;

}

}

StatusMessageType枚举类：

///

/// 提示消息类别

///

public enum StatusMessageType

{

///

/// 权限不足

///

NoAccess = -2,

///

/// 错误

///

Error = -1,

///

/// 成功

///

Success = 1,

///

/// 提示信息

///

Hint = 0

}

其他的扩展方法就不一一给出来了。

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