Html5上传插件封装

      前段时间将flash的上传控件替换成使用纯js实现的,在此记录

1.创建标签

<div class="camera-area" style="display:inline-block;float:left">
    <input type="file" id="UploadFile" name="fileToUpload" class="fileToUpload" style="float:left;auto;padding:10px 0" />
    <div class="upload-progress"></div>
    <div class="thumb">
        <img  id="myPhoto" />
    </div>
</div>   

div内部有3个标签 第一个是上传，第二个是上传进度,第三个为了上传的预览

2.封装上传插件

   //拓展
    $.extend($.fn, {
        fileUpload: function (opts) {
            this.each(function () {
                var $self = $(this);
                var doms = {
                    "fileToUpload": $self.find(".fileToUpload"),
                    "thumb": $self.find(".thumb"),
                    "progress": $self.find(".upload-progress")
                };
                var funs = {
                    //选择文件，获取文件大小，也可以在这里获取文件格式，限制用户上传非要求格式的文件
                    "fileSelected": function () {
                        var files = (doms.fileToUpload)[0].files;
                        var count = files.length;
                        for (var index = 0; index < count; index++) {
                            var file = files[index];
                            var fileSize = 0;
                            if (file.size > 1024 * 1024)
                                fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
                            else
                                fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
                        }
                        funs.uploadFile();
                    },
                    //异步上传文件
                    uploadFile: function () {
                        var fd = new FormData();//创建表单数据对象
                        var files = (doms.fileToUpload)[0].files;
                        var count = files.length;
                        for (var index = 0; index < count; index++) {
                            var file = files[index];
                            fd.append(opts.file, file);//将文件添加到表单数据中
                            funs.previewImage(file);//上传前预览图片，也可以通过其他方法预览txt
                        }
                        var xhr = new XMLHttpRequest();
                        xhr.upload.addEventListener("progress", funs.uploadProgress, false);//监听上传进度
                        xhr.addEventListener("load", funs.uploadComplete, false);
                        xhr.addEventListener("error", opts.uploadFailed, false);

                        xhr.open("POST", opts.url);
                        xhr.send(fd);
                    },
                    //文件预览
                    previewImage: function (file) {
                        var gallery = doms.thumb;
                        var img = document.createElement("img");
                        img.file = file;
                        doms.thumb.html(img);
                        // 使用FileReader方法显示图片内容
                        var reader = new FileReader();
                        reader.onload = (function (aImg) {
                            return function (e) {
                                aImg.src = e.target.result;
                            };
                        })(img);
                        reader.readAsDataURL(file);
                    },
                    uploadProgress: function (evt) {
                        if (evt.lengthComputable) {
                            var percentComplete = Math.round(evt.loaded * 100 / evt.total);
                            doms.progress.html(percentComplete.toString() + '%');
                        }
                    },
                    "uploadComplete": function (evt) {
                        var returnModel = JSON.parse(evt.target.responseText);
                        if (returnModel.url) {
                            $("#" + opts.id).val(returnModel.url);
                        }
                        if (!returnModel.success) {
                            alert(returnModel.msg);
                            $(".upload-progress").html("0%");
                            $(".thumb img").attr("src", "");
                            $("#" + opts.id).val("");
                        }
                    }
                };
                doms.fileToUpload.on("change", function () {
                    doms.progress.find("span").width("0");
                    funs.fileSelected();
                });
            });
        }
    });

3.调用封装的控件

 $(".camera-area").fileUpload({
            "url": "/Home/SavePhoto",
            "file": "fileName",
            "id": "Photo"
        });  

url:上传的位置

file:后台接收此文件的参数

id:当前是冗余拓展，博主本意是上传到服务器后返回个url，url指向上传文件的服务器路径

4.控制器接收文件并且保存(简单实现)

         [HttpPost]
        /// <summary>
        /// 上传文件
        /// </summary>
        /// <returns></returns>
        public ActionResult SavePhoto()
        {
             //fileName要和视图的插件参数一致
            HttpPostedFileBase file = HttpContext.Request.Files["fileName"];
            string savePath = Path.Combine(Server.MapPath("~/Temp/"), DateTime.Now.Year.ToString(), DateTime.Now.Month.ToString());
            if (!Directory.Exists(savePath))
            {
                Directory.CreateDirectory(savePath);
            }
            string fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + Path.GetExtension(file.FileName);
            fileName = Path.Combine(savePath, fileName);
            file.SaveAs(fileName);
            return this.Json(new { success = true });
        }

5.效果演示