Question

我希望在上传后显示上传的图片，但我不能。我从JS控制台收到一条错误：Not allowed to load local resource Error

这是我的代码：

控制器方法：

获取文件并将其保存到localsystem

[HttpPost]
// public static readonly string TEMPORARY_FILES_UPLOADS_PATH = "~/Uploads/Tmp";     
public ActionResult UploadFileToTemporaryFolder(HttpPostedFileBase file)
            {
                string fileName = String.Empty;
                string path = String.Empty;
                if (file != null)
                {
                    try
                    {
                       string timestamp = DateTime.UtcNow.ToString("yyyy_MM_dd_HH_mm_ss_fff",CultureInfo.InvariantCulture);
                       fileName = timestamp + "_" + Path.GetFileName(file.FileName);
                       path = string.Format("{0}/{1}", Server.MapPath(ApplicationConfig.TEMPORARY_FILES_UPLOADS_PATH), fileName);
                        System.IO.Directory.CreateDirectory(Server.MapPath(ApplicationConfig.TEMPORARY_FILES_UPLOADS_PATH));
                        file.SaveAs(path);
                    }
                    catch (Exception)
                    {}
                }
                return Json(new { FileName = fileName, FilePath=path }, JsonRequestBehavior.AllowGet);
            }

HTML：

<input id="HotelJustificatifFile" type="file" value="joindre pièce" name="upload"  >
<div id="JustificatifsHotelSection" style="display:block;"></div>

Js

上传文件＆amp;将结果附加到div

 $('body').on('change', '#HotelJustificatifFile', function () {

               var file = document.getElementById('HotelJustificatifFile').files[0];
               if (file != null) {
                   var myData = new FormData();
                   myData.append("file", file);

                   // Uploading File via Ajax To Temporar Folder
                   $.ajax({
                       type: "POST",
                       url: "<%: Url.Action("UploadFileToTemporaryFolder","Enqueteur") %>",
                       processData: false,
                       contentType: false,
                       data: myData,
                       cache: false,
                       dataType: "json",
                       success: function (result) {
                           if (result.FileName != '') {

                               var fileName = result.FileName;
                               var filePath = result.FilePath;

                               //alert(filePath );
                               var imageDiv = "<div>";
                               imageDiv+='<div style="z-index: 10; position: absolute; top: 4px; left: 10px;">';
                               imageDiv += '<a onclick="afficherImage(' + fileName + ')" >Supprimer</a>';
                               imageDiv +='</div>';
                               imageDiv += '<img u=image src="' +filePath + '" />';
                               imageDiv += '</div>';
                               // Adding Image To the Div 
                               $('#JustificatifsHotelSection').append(imageDiv);

                           }
                           },
                       failure: function () {
                       }
                   });

                   // Else
                }
           });

Answer 1

您无法返回物理文件路径

尝试返回图片网址（http：//...../ imageName）

或者您可以使用html5 API在浏览器中显示图像，而无需将图像上传到服务器：

var file = document.getElementById(HotelJustificatifFile).files[0];
var reader = new FileReader();
var img = new Image();
img.src = reader.result;
youDivContainerForImage.appendChild(img);

Answer 2

不允许加载本地资源错误，可能是此链接解决了您的答案.. http://www.scriptscoop.net/t/17cccd1064d6/angularjs-1-2-not-allowed-to-load-local-resource.html

Answer 3

您将返回物理文件路径，而不是考虑这一点：

var virtualPath=Url.Content(string.Format("{0}/{1}",
    ApplicationConfig.TEMPORARY_FILES_UPLOADS_PATH, fileName));

return Json(new { FileName = fileName, FilePath=virtualPath}, 
    JsonRequestBehavior.AllowGet);

Answer 4

我想指出，Javascript可以自行完成，而无需通过API发送文件。

不允许网页使用用户计算机上的文件（以file:///开头的物理文件路径），我很高兴他们不是。你想让互联网上随机的人玩你电脑上的东西吗？当然你没有。

幸运的是，您可以使用数据网址（以data:[MIME type];base64,开头）访问用户选择上传的任何文件（通过文件输入），您可以通过Javascript的内置{{1}获取一个文件对象。见下文：

FileReader

基本上，这会使用var previewImage = document.getElementById('my-preview'); var filereader = new FileReader(); filereader.onload = function (event) { var data = event.target.result; previewImage.src = data; }; var file = document.getElementById('file-input').files[0]; filereader.readAsDataUrl(file);将用户上传的文件转换为base64 FileReader网址，您可以随意使用该网址（并且data:标记不是害怕将它用作<img>属性。）

这是一场胜利。您已经获得了预览图像，并且您无需了解合理的浏览器安全性。

Answer 5

我解决了问题，这是我的控制器方法：

    [HttpPost]
            public ActionResult UploadFileToTemporaryFolder(HttpPostedFileBase file)
            {
                string fileName = String.Empty;
                string path = String.Empty;
                if (file != null)
                {
                    try
                    {
                       string timestamp = DateTime.UtcNow.ToString("yyyy_MM_dd_HH_mm_ss_fff",CultureInfo.InvariantCulture);
                       fileName = timestamp + "_" + Path.GetFileName(file.FileName);
                      // Relative Path ex "/uploads/Tmp"
                       path = Url.Content(ApplicationConfig.TEMPORARY_FILES_UPLOADS_PATH);
                       System.IO.Directory.CreateDirectory(Server.MapPath(ApplicationConfig.TEMPORARY_FILES_UPLOADS_PATH));
                       // absolute path : C://........../uploads/Tmp
                       string fileSystemPath = string.Format("{0}/{1}", Server.MapPath(ApplicationConfig.TEMPORARY_FILES_UPLOADS_PATH), fileName);
                       file.SaveAs(fileSystemPath);
                    }
                    catch (Exception)
                    {}
                }
               // i send the relative path + filename
                return Json(new { FileName = fileName, FilePath=path }, JsonRequestBehavior.AllowGet);
            }

我在Js Code中得到了这样的路径：

success: function (result) {
                           if (result.FileName != '') {

                               var fileName = result.FileName;
                               var filePath = result.FilePath;

                               //alert(filePath );
                                var imageDiv = '<div>';
                                imageDiv+='<div style="z-index: 10; position: absolute; top: 4px; left: 10px;">';
                                        imageDiv += '<a onclick="afficherImage(' + fileName + ')" >Supprimer</a>';
                                     imageDiv +='</div>';
                                     imageDiv += '<img style="width:100%; height:500px" u=image src="' +filePath +'/'+fileName+ '" />';
                                   imageDiv += '</div>';
                               // Adding Image To the Div 
                                   $('#HotelJustifS').append(imageDiv);

                           }
                           }

Answer 6

您只需要用存储的已编码HTML字符串中的字节字符串替换所有图像网络路径（或本地路径）即可。为此，您需要HtmlAgilityPack将HTML字符串转换为HTML文档。 https://www.nuget.org/packages/HtmlAgilityPack

查找以下代码，将每个图像src网络路径（或本地路径）转换为字节字符串。它肯定会在IE，chrome和firefox中显示具有网络路径（或本地路径）的所有图像。

string encodingHtmlString = Emailmodel.DtEmailFields.Rows [0] [“ Body”]。ToString（）;

            // Decode the encoded string.
            StringWriter myWriter = new StringWriter();
            HttpUtility.HtmlDecode(encodedHtmlString, myWriter);
            string DecodedHtmlString = myWriter.ToString();

            //find and replace each img src with byte string
             HtmlDocument document = new HtmlDocument();
             document.LoadHtml(DecodedHtmlString);
             document.DocumentNode.Descendants("img")
              .Where(e =>
            {
                string src = e.GetAttributeValue("src", null) ?? "";
                return !string.IsNullOrEmpty(src);//&& src.StartsWith("data:image");
            })
            .ToList()
                        .ForEach(x =>
                        {
                            string currentSrcValue = x.GetAttributeValue("src", null);                                
                            string filePath = Path.GetDirectoryName(currentSrcValue) + "\\";
                            string filename = Path.GetFileName(currentSrcValue);
                            string contenttype = "image/" + Path.GetExtension(filename).Replace(".", "");
                            FileStream fs = new FileStream(filePath + filename, FileMode.Open, FileAccess.Read);
                            BinaryReader br = new BinaryReader(fs);
                            Byte[] bytes = br.ReadBytes((Int32)fs.Length);
                            br.Close();
                            fs.Close();
                            x.SetAttributeValue("src", "data:" + contenttype + ";base64," + Convert.ToBase64String(bytes));                                
                        });

            string result = document.DocumentNode.OuterHtml;
            //Encode HTML string
            string myEncodedString = HttpUtility.HtmlEncode(result);

            Emailmodel.DtEmailFields.Rows[0]["Body"] = myEncodedString;

不允许加载本地资源错误

6 个答案: