asp.net下上传图片加实时预览

来源：互联网发布：android 启动时间优化编辑：程序博客网时间：2024/05/29 15:14

html

<div style="position: relative;">                                    <img id="uploadPreview" style="width: 100px; height: 100px;" src="data:image/svg+xml,%3C%3Fxml%20version%3D%221.0%22%3F%3E%0A%3Csvg%20width%3D%22153%22%20height%3D%22153%22%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%3E%0A%20%3Cg%3E%0A%20%20%3Ctitle%3ENo%20image%3C/title%3E%0A%20%20%3Crect%20id%3D%22externRect%22%20height%3D%22150%22%20width%3D%22150%22%20y%3D%221.5%22%20x%3D%221.500024%22%20stroke-width%3D%223%22%20stroke%3D%22%23666666%22%20fill%3D%22%23e1e1e1%22/%3E%0A%20%20%3Ctext%20transform%3D%22matrix%286.66667%2C%200%2C%200%2C%206.66667%2C%20-960.5%2C%20-1099.33%29%22%20xml%3Aspace%3D%22preserve%22%20text-anchor%3D%22middle%22%20font-family%3D%22Fantasy%22%20font-size%3D%2214%22%20id%3D%22questionMark%22%20y%3D%22181.249569%22%20x%3D%22155.549819%22%20stroke-width%3D%220%22%20stroke%3D%22%23666666%22%20fill%3D%22%23000000%22%3E%3F%3C/text%3E%0A%20%3C/g%3E%0A%3C/svg%3E" alt="Image preview" />                                    <input type="hidden" name="img" id="imgsrc" value="" />                                    <input type="hidden" name="img" id="adid" value="" />                                    <input type="hidden" name="img" id="url" value="" />                                    <input id="uploadImage" type="file" name="myPhoto" onchange="loadImageFile()" style="position: absolute; height: 100px; width: 100px; top: 0; filter: alpha(opacity=0); -moz-opacity: 0; opacity: 0;" />                                    <div class="clear"></div>                                </div>

 oFReader = new FileReader(), rFilter = /^(?:image\/bmp|image\/cis\-cod|image\/gif|image\/ief|image\/jpeg|image\/jpeg|image\/jpeg|image\/pipeg|image\/png|image\/svg\+xml|image\/tiff|image\/x\-cmu\-raster|image\/x\-cmx|image\/x\-icon|image\/x\-portable\-anymap|image\/x\-portable\-bitmap|image\/x\-portable\-graymap|image\/x\-portable\-pixmap|image\/x\-rgb|image\/x\-xbitmap|image\/x\-xpixmap|image\/x\-xwindowdump)$/i;        oFReader.onload = function (oFREvent) {            document.getElementById("uploadPreview").src = oFREvent.target.result;        };        function loadImageFile() {            if (document.getElementById("uploadImage").files.length === 0) { return; }            var oFile = document.getElementById("uploadImage").files[0];            if (!rFilter.test(oFile.type)) { alert("必须选择一个图片格式的文件！"); return; }            oFReader.readAsDataURL(oFile);            $.ajaxFileUpload({                type: "post",                url: '@Url.Action("upoload", "Advertise")',                fileElementId: 'uploadImage',                dataType: 'txt',                data: { f: $("#uploadImage").val() },                success: function (msg) {                    if (msg != "no") {                        $("#imgsrc").val(msg);                    }                    else {                        alert("图片类型错误！")                    }                }            });        }

后台代码：

  public ActionResult upoload()        {            var file = Request.Files[0];            var nameEx = Path.GetExtension(file.FileName);            if (CheckImageExt(nameEx))            {                try                {                    string name = DateTime.Now.ToString("yyyyMMddHHmmssffff", DateTimeFormatInfo.InvariantInfo) + nameEx;                    string newname = DateTime.Now.ToString("yyyy/MM/dd");                    string basic = @"\\192.1.1.1\Users\Public\assets\manager\upload\advertise-ad\" + newname + "/";                    string efBasic = "http://192.1.1.1/manager/upload/advertise-ad/" + newname + "/";                    if (!System.IO.Directory.Exists(basic))                    {                        System.IO.Directory.CreateDirectory(basic);                    }                    var filesname = Path.Combine(basic + name);                    var effilesname = Path.Combine(efBasic + name);                    HttpPostedFileBase f = file;                    f.SaveAs(filesname);                    return Content(effilesname);                }                catch {                    return Content("no");                }            }            else            {                return Content("no");            }        }

检查图片类型：

public static bool CheckImageExt(string _ImageExt)        {            string[] allowExt = new string[] { ".gif", ".jpg", ".jpeg", ".bmp", ".png" };            for (int i = 0; i < allowExt.Length; i++)            {                if (string.Compare(allowExt[i], _ImageExt, true) == 0)                { return true; }            }            return false;        }

0 0