ExtJS：检测单击Html编辑器中的图像？

Question

我正在使用ExtJS中的HTML编辑器，我想检测编辑器主体内的点击并访问目标元素的属性？例如，如果用户点击了图像，我想访问src属性。到目前为止，我尝试了以下操作，但我只能检测到点击，但没有点击哪个元素：

    public static async Task<Google.Apis.Drive.v3.Data.File> UploadSync(DriveService driveService, string filepath)
    {
        string destfilename = Path.GetFileName(filepath);

        List<string> parents = new List<string>();

        parents.Add("root");
        // Prepare the JSON metadata
        string json = "{\"name\":\"" + destfilename + "\"";
        if (parents.Count > 0)
        {
            json += ", \"parents\": [";
            foreach (string parent in parents)
            {
                json += "\"" + parent + "\", ";
            }
            json = json.Remove(json.Length - 2) + "]";
        }
        json += "}";
        Debug.WriteLine(json);

        Google.Apis.Drive.v3.Data.File uploadedFile = null;
        try
        {
            System.IO.FileInfo info = new System.IO.FileInfo(filepath);

            ulong fileSize = (ulong)info.Length;

            var uploadStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read);

            var insert = driveService.Files.Create(new Google.Apis.Drive.v3.Data.File { Name = destfilename, Parents = new List<string> { "root" } }, uploadStream, "application/octet-stream");

            Uri uploadUri = insert.InitiateSessionAsync().Result;

            int chunk_size = ResumableUpload.MinimumChunkSize;
            int bytesSent = 0;
            while (uploadStream.Length != uploadStream.Position)
            {
                byte[] temp = new byte[chunk_size];
                int cnt = uploadStream.Read(temp, 0, temp.Length);
                if (cnt == 0)
                    break;

                HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(uploadUri);

                httpRequest.Method = "PUT";
                httpRequest.Headers["Authorization"] = "Bearer " + ((UserCredential)driveService.HttpClientInitializer).Token.AccessToken;
                httpRequest.ContentLength = (long)cnt;
                httpRequest.Headers["Content-Range"] = string.Format("bytes {0}-{1}/{2}", bytesSent, bytesSent + cnt - 1, fileSize);

                using (System.IO.Stream requestStream = httpRequest.GetRequestStreamAsync().Result)
                {
                    requestStream.Write(temp, 0, cnt);
                }

                HttpWebResponse httpResponse;
                try
                {
                    httpResponse = (HttpWebResponse)httpRequest.GetResponse();
                }
                catch (WebException ex)
                {
                    httpResponse = (HttpWebResponse)ex.Response;
                }

                if (httpResponse.StatusCode == HttpStatusCode.OK)
                { }
                else if ((int)httpResponse.StatusCode != 308)
                    break;

                bytesSent += cnt;

                Console.WriteLine("Uploaded " + bytesSent.ToString());
            }

            if (bytesSent != uploadStream.Length)
            {
                return null;
            }

            // Try to retrieve the file from Google
            FilesResource.ListRequest request = driveService.Files.List();
            if (parents.Count > 0)
                request.Q += "'" + parents[0] + "' in parents and ";
            request.Q += "name = '" + destfilename + "'";
            FileList result = request.Execute();
            if (result.Files.Count > 0)
                uploadedFile = result.Files[0];
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }

        return uploadedFile;
    }

在“源编辑”模式下，以下是编辑器中唯一的项目：

//Called after the editor has rendered
afterEditorRender : function( editor, eOpts )
{
        Ext.get(editor.iframeEl).on('click', function(e,t,a){console.log(e.target.id,t,a)})
...

显然，当图像插入编辑器时，我们可以为该元素输入任意数量的属性。