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ASP.Net MVC3 图片上传详解(form.js,bootstrap)

2013-11-19 19:32 stoneniqiu 阅读(...) 评论(...) 编辑 收藏

     图片上传的插件很多,但很多时候还是不能切合我们的需求,我这里给大家分享个我用一个form,file实现上传四张图片的小demo。完全是用jquery前后交互,没有用插件。

     最终效果图如下:

     

    玩过花田人可能有些眼熟,原型就是来自于花田网中的图片上传。 

    引用的脚本有:

  <script src="../../Scripts/jquery-ui-1.9.2.custom.min.js"></script>
    <script src="../../Scripts/jquery-1.8.3.js"></script>
    <link href="../../Content/bootstrap/css/bootstrap.min.css" rel="stylesheet" />
    <script src="../../Content/bootstrap/js/bootstrap.min.js"></script>  <script src="../../Content/JS/form.js"></script>
View Code

    基本思路:用户点击相关div触发file元素打开浏览框----》用setInterval不断检测file文件是否选中文件---》选中之后触发form自动提交到后台---》后台将文件存储到临时文件夹返回图片在临时文件夹的地址---》窗口提示上传功能并预览图片---》用户点击发布---》后台保存图片(移动到指定文件夹,并存入数据库)

   整个过程form和file都是隐藏的。另外的效果

  1. 开始的时候只显示一个上传框,前一个上传完成后,显示下一个上传框。并总是显示在最后面。

  2. 有图片的时候才能提交和输入描述。

  3.上传成功之后,删除后才能再次上传。

  Html+css

      .uploadbox {
            float: left;width: 115px;height: 115px;
            background-color: #eeeeee;
            margin-right: 10px;color: white;text-align: center;cursor: pointer;
            position: relative;display: none;
        }
        .uploadbox:hover {
              background-color: #b4b4b4;
        }
       .stt{ font-size: xx-small;display: block;}
       .add{  vertical-align: baseline;display: block;height: auto;font-size: 8em; height: 40px;padding: 10px;margin-top: 30px}
      .imgcontainer{ width: 100%;height: 100%}  .imgcontainer img{ max-height: 115px;max-width: 115px;}
        .inputdiv{ clear: both;display: block;padding-top: 10px;}
        #Remark{ width:478px;}
       .infospan{display: none; height: 20px;position: absolute;bottom: 0;right: 0;width: 100%;background-color: #00bfff;z-index: 1;clear: both;opacity: 0.8;}
       .closespan{display: none; position: absolute;right: -7px;top: -7px;width: 14px;height: 14px;border-radius: 7px;background-color: white;border: 1px gainsboro solid;color: gray;
           font-weight: bold;font-size: medium;
           line-height: 16px;
       }   .closespan:hover{ color: red;}
       #imgupload form{ display: none;}       
       .imguploadmessage{ font-size: small;color: green;float: left;margin-left: 10px;}
       .carclose{ cursor: pointer;  
           background-color: white;opacity: 1;
           position: absolute;z-index: 99;top:0px;right: -40px;
           width: 40px;height:40px;border-radius: 20px;text-align: center;
           line-height: 40px;font-size: 2em;color: gray;
       }.carclose:hover{ color: green;background-color: #eeeeee}
View Code
  <div id="imgupload" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
        <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
            <h4>上传图片</h4>  
        </div>
        <div class="modal-body">
            <div class="uploadbox" data-count="0" style="display: inline;">
                <span class="closespan" title="删除照片">&times;</span>
                <div class="imgcontainer">
                    <div class="add">+</div>
                    <div class="stt">点击上传</div>
                </div>
                <span class="infospan">
                    <img src='../../Content/Photos/loading.gif' />正在上传...</span>
            </div> 
            <div class="uploadbox" data-count="0"  >
                <span class="closespan" title="删除照片">&times;</span>
                <div class="imgcontainer">
                    <div class="add">+</div>
                    <div class="stt">点击上传</div>
                </div>
                <span class="infospan"> <img src='../../Content/Photos/loading.gif' />正在上传...</span>
            </div> 
            <div class="uploadbox"data-count="0" >
                <span class="closespan" title="删除照片">&times;</span>
                <div class="imgcontainer">
                    <div class="add">+</div>
                    <div class="stt">点击上传</div>
                </div>
                <span class="infospan"> <img src='../../Content/Photos/loading.gif' />正在上传...</span>
            </div> 
            <div class="uploadbox"data-count="0"  >
                <span class="closespan" title="删除照片">&times;</span>
                <div class="imgcontainer">
                    <div class="add">+</div>
                    <div class="stt">点击上传</div>
                </div>
                <span class="infospan"> <img src='../../Content/Photos/loading.gif' />正在上传...</span>
            </div> 
            <div class="inputdiv"><input type="text" disabled="disabled" id="Remark" name="Remark" placeholder="补充说明下~"/></div>
        </div>
            <div class="modal-footer">
             上传大小在8k-10M之间 <span class="imguploadmessage"></span>
              <button class="btn btn-success "  disabled="disabled"   id="imgsubmit">发布</button>
              <form action="/User/UpLoadPhoto" method="POST" enctype="multipart/form-data" name="ImgForm" id="ImgForm">
              <input type="file" name="file" id="imgFlie"  required="required" />
              <input type="submit" name="subt" value="上传图片" />
              </form>
            </div>
   
    </div>
View Code

Jquery:

 //图片上传-------------------------------------imgupload---------------------

    var imgbox = {};//用来获取当前点击的 uploadbox 
    var childs = $(".imgcontainer:eq(0)").html();// 先保存内部元素,上传完成之后方便恢复到最初状态
    $(".uploadbox").click(function () {
        var tag = $(this).attr("data-count");//用来判断是否已经含有照片
        if (tag == "1") return false;
        $("#imgFlie").click();
        imgbox = $(this);
        var stm1 = setInterval(function () {
            var imgstr = $("#imgFlie").val(); //检测file元素是否已经含有文件
            if (imgstr != "") {
                clearInterval(stm1);
                $("#ImgForm input[type='submit']").click();
            }
        }, 500);
        return false;
    });

    // 取消照片
    $(".closespan").click(function (e) {
        e.stopPropagation();
        var sum = $(".uploadbox img").length;
        // 保证有一个框可以让用户再次选择 需要显示childs 设置data-count属性 必要的再隐藏
        var imgsrc = $(this).next().find("img").attr("src");
        $(this).next().html("").append(childs);
        // 隐藏关闭和成功提示
        $(this).hide();
        $(this).siblings(".infospan").hide();
        $(this).parent().attr("data-count", 0).insertBefore($(".inputdiv"));;

        if (sum < 4) {//说明此时是有一个再准备状态,这个可以直接做删除处理 
            // 设置data-count 并隐藏父级
            $(this).parent().hide();
            //需要移位 保证准备状态的总是在最后一个  
        }
        // 清除session 减少一个字符串
        if (imgsrc != undefined) {
            $.post("/User/DeleteImg", { str: imgsrc }, function () {

            });
        }
        if (sum == 1) {
            $('#Remark,#imgsubmit').attr("disabled", "disabled");// 说明这个时候还没有图片上传,所以要禁止发布键和描述框
        }

    });

    //----------上传图片---------------------------------------------
    $("#imgsubmit").click(function () {
        var imgcontent = $.trim($("#Remark").val());
        $.post("/User/SaveImgs", { content: imgcontent }, function (data) {
            if (data == 1) {
                //清除content
                $(".imgcontainer").html(childs);
                //隐藏进度条和关闭键
                $(".closespan,.infospan").hide();
                $(".imguploadmessage").html("上传成功!");
                //禁止输入框和提交按钮
                $('#Remark,#imgsubmit').attr("disabled", "disabled");
                //去掉data-count 属性 显示第一个;
                $(".uploadbox").attr("data-count", 0).hide().eq(0).show();
                //清空
                $("#Remark").val("");
                var stt = setTimeout(function () {
                    $("#imgupload").modal('hide');
                    $(".imguploadmessage").html("");
                    clearTimeout(stt);
                }, 1000);
            }
        });
    });

    $('#ImgForm').ajaxForm({//用到form.js 提交form 
        beforeSend: function () {
            imgbox.find(".infospan").show();//显示正在上传...
        },
        success: function (data) {
            $("#imgFlie").val("");//
            imgbox.find(".imgcontainer").html(data);//.hide()
            var img = imgbox.find(".imgcontainer").find("img").attr("src");
            if (img != undefined) {//表示上传成功
                //解禁
                $('#Remark').removeAttr("disabled");
                $('#imgsubmit').removeAttr("disabled");
                imgbox.find(".infospan,.closespan").show();
                imgbox.find(".infospan").html("上传成功!");
                //显示下一个
                //imgbox.next().show();
                $(".uploadbox:hidden").eq(0).show();

                imgbox.attr("data-count", "1");
            } else {
                imgbox.find(".infospan,.closespan").hide();
            }
            // alert(img);
        }, complete: function (xhr) {
            $("#imgFlie").val("");
        }
    });

 后台controller的代码

   [HttpPost]
        public void UpLoadPhoto(HttpPostedFileBase file)
        {
            var res = CheckImg(file);
            if (res == "ok")
            {
                var fileName = file.FileName;//Path.GetExtension() 也许可以解决这个问题,先不管了。
                var pathtemp = Path.Combine(Server.MapPath("../Content/TempFile/"), fileName);//先存入临时文件夹
                var scrtemp = Path.Combine("../../Content/TempFile/", fileName);//图片展示的地址

                var list = Session["Imgscr"] as List<string>;
                var slist = Session["ImgServerscr"] as List<string>;
                if (list != null)
                {
                    list.Add(scrtemp);
                }
                else
                {
                    list = new List<string> { scrtemp };
                    Session["Imgscr"] = list;
                }
                if (slist != null)
                {
                    slist.Add(pathtemp);
                }
                else
                {
                    slist = new List<string> { pathtemp };
                    Session["ImgServerscr"] = slist;
                }

                file.SaveAs(pathtemp);
                Response.Write("<img src='../../Content/TempFile/" + fileName + "' /> ");
            }
            else
            {
                Response.Write(res);
            }
        }

        /// <summary>
        /// 删除预览中的照片
        /// </summary>
        /// <param name="str">这个str 已经是处理过的,不是之前上传的图片名称</param>
        public void DeleteImg(string str)
        {
            //删除地址 删除文件
            var list = Session["Imgscr"] as List<string>;
            if (list == null) return;
            var index = list.IndexOf(str);
            var slist = Session["ImgServerscr"] as List<string>;
            if (slist != null && index != -1)
            {
                var imgone = slist[index];
                if (imgone != null)
                {
                    var img = new FileInfo(imgone);
                    if (img.Exists) img.Delete();
                }
            }
            list.Remove(str);
        }

        private string CheckImg(HttpPostedFileBase file)
        {
            if (file == null) return "图片不能空!";
            if (file.ContentLength / 1024 > 8000)
            {
                return "图片太大";
            }
            if (file.ContentLength / 1024 < 10)
            {
                return "图片太小!";
            }
            var image = GetExtensionName(file.FileName).ToLower();
            if (image != ".bmp" && image != ".png" && image != ".gif" && image != ".jpg" && image != ".jpeg")// 这里你自己加入其他图片格式,最好全部转化为大写再判断,我就偷懒了
            {
                return "格式不对";
            }

            var scrtemp = Path.Combine("../../Content/TempFile/", file.FileName);//图片展示的地址
            var list = Session["Imgscr"] as List<string>;
            if (list != null && list.Find(n => n == scrtemp) != null)
            {
                return "同样的照片已经存在!";
            }

            return "ok";
        }

        public JsonResult SaveImgs(string content)
        {
            var uid = CheckValid();
            if (_uName == null) _uName = GetUserNameById(uid);

            string path = Path.Combine(HttpContext.Server.MapPath("../Content/UploadFiles/"), _uName, "Photos", "ImgBox");
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            var list = Session["Imgscr"] as List<string>;
            var finallist = new List<string>();
            if (list == null) return Json(0);
            foreach (var str in list)
            {
                var scrtemp1 = Server.MapPath(str.Substring(3, str.Length - 3));//去掉第一个../
                var img = new FileInfo(scrtemp1);
                if (img.Exists)
                {
                    var image = GetExtensionName(img.Name);
                    //处理照片名称
                    var imgname = string.Format("{0:yyyMMdd}", DateTime.Now).Replace("/", "") + DateTime.Now.Ticks.ToString(CultureInfo.InvariantCulture).Substring(7, 11) + image;
                    var scrdestination = Path.Combine(HttpContext.Server.MapPath("../Content/UploadFiles/"), _uName, "Photos", "ImgBox", imgname);
                 
                    var scrshow = Path.Combine(("../../Content/UploadFiles/"), _uName, "Photos", "ImgBox", imgname);
                    finallist.Add(scrshow);
                    //移动照片
                    img.MoveTo(scrdestination);
                    //存入imgbox
                    var box = new Iamgbox
                    {
                        ActionTime = DateTime.Now,
                        BoxName = _uName,
                        ImgUrl = scrshow,
                        IsValid = true, //默认是正规合适的图片 不合适在检举
                        PraiseCount = 0,
                        Remark = content,
                        UserId = uid,
                        VisitCount = 0,
                    };
                    LoveDb.Add(box);
                };
            }
            if (finallist.Count() != 0)
            {
                var sbstr = new StringBuilder("<br/><div class='imgtigger'>");
                foreach (var str in finallist)
                {
                    sbstr.Append("<img src='" + str + "' />");
                }
                sbstr.Append("</div>");
                var state = new State
                {
                    ActionTime = DateTime.Now,
                    Content = (content == "" ? string.Format("刚刚上传了{0}张照片:", finallist.Count) : content)+sbstr,
                    PraiseCount = 0,
                    StateType = StateType.Image.ToString(),
                    UserId = uid
                };
                LoveDb.Add(state);
                Session.Remove("Imgscr");
                Session.Remove("ImgServerscr");
            }
              

            return Json(1);
        }
   public string GetExtensionName(string fileName)
        {
            if (fileName.LastIndexOf("\\", StringComparison.Ordinal) > -1)//在不同浏览器下,filename有时候指的是文件名,有时候指的是全路径,所有这里要要统一。
            {
                fileName = fileName.Substring(fileName.LastIndexOf("\\", StringComparison.Ordinal) + 1);//IndexOf 有时候会受到特殊字符的影响而判断错误。加上这个就纠正了。
            }
            return Path.GetExtension(fileName.ToLower());
        }
View Code

 到这,这个过程就完成了,希望对你有帮助。

 Demo 下载地址: http://download.csdn.net/detail/stoneniqiu/6581841 

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