File operations in Angular File manager component

23 Oct 202424 minutes to read

The file manager component is used to browse, manage, and organize the files and folders in a file system through a web application. All basic file operations like creating a new folder, uploading and downloading of files in the file system, and deleting and renaming of existing files and folders are available in the file manager component. Additionally, previewing of image files is also provided in the file manager component.

The following table represents the basic operations available in the file manager and their corresponding functions.

Operation Name	Function
read	Read the details of files or folders available in the given path from the file system, to display the files for the user to browse the content.
create	Creates a new folder in the current path of the file system.
delete	Removes the file or folder from the file server.
rename	Rename the selected file or folder in the file system.
search	Searches for items matching the search string in the current and child directories.
details	Gets the detail of the selected item(s) from the file server.
copy	Copy the selected file or folder in the file system.
move	Cut the selected file or folder in the file server.
upload	Upload files to the current path or directory in the file system.
download	Downloads the file from the server and the multiple files can be downloaded as ZIP files.

The CreateFolder, Remove, and Rename actions will be reflected in the file manager only after the successful response from the server.

Folder Upload support

To perform the directory(folder) upload in File Manager, set directoryUpload as true within the uploadSettings property. The directory upload feature is supported for the following file service providers:

Physical file service provider.
Azure file service provider.
NodeJS file service provider.
Amazon file service provider.

In the following example, directory upload is enabled/disabled on DropDownButton selection.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser'
import { NgModule } from '@angular/core'
import { FileManagerModule } from '@syncfusion/ej2-angular-filemanager'



import { Component, ViewEncapsulation, ViewChild  } from '@angular/core';
import { FileManagerComponent, NavigationPaneService, ToolbarService, DetailsViewService } from '@syncfusion/ej2-angular-filemanager';
import { DropDownButton, ItemModel } from '@syncfusion/ej2-splitbuttons';
/**
 * File Manager directory upload feature sample
 */

@Component({
imports: [FileManagerModule, ],

providers:[NavigationPaneService, ToolbarService, DetailsViewService],
standalone: true,
    selector: 'app-root',
    styleUrls: ['./app.component.css'],
    template: `<ejs-filemanager id='file' #fileObj [ajaxSettings]='ajaxSettings' (created)="onCreated($event)">
    </ejs-filemanager>`
})

export class AppComponent{
    @ViewChild('fileObj')
    public fileObj?: FileManagerComponent;
    public ajaxSettings?: object;
    public hostUrl: string = 'https://ej2-aspcore-service.azurewebsites.net/';
    public ngOnInit(): void {
        this.ajaxSettings = {
            url: this.hostUrl + 'api/FileManager/FileOperations',
            getImageUrl: this.hostUrl + 'api/FileManager/GetImage',
            uploadUrl: this.hostUrl + 'api/FileManager/Upload',
            downloadUrl: this.hostUrl + 'api/FileManager/Download'
        };
    }
    //DropDownButton items definition
    public items: ItemModel[] = [{ text: 'Folder' }, { text: 'Files' }];

  onCreated(args: any) {
    let customBtn: HTMLElement = document.getElementById('file_tb_upload') as HTMLElement;
    customBtn.onclick = (e) => {
      e.stopPropagation();
    };
    let drpDownBtn: DropDownButton = new DropDownButton(
      {
        items: this.items,
        select: (args) => {
          if (args.item.text === 'Folder') {
            (this.fileObj as FileManagerComponent).uploadSettings.directoryUpload = true;
          } else {
            (this.fileObj as FileManagerComponent).uploadSettings.directoryUpload = false;
          }
          setTimeout(function () {
            let uploadBtn: HTMLElement = document.querySelector(
              '.e-file-select-wrap button'
            ) as HTMLElement;
            uploadBtn.click();
          }, 100);
        },
      },
      '#file_tb_upload'
    );
  }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Physical file service provider

To achieve the directory upload in the physical file service provider, use the below code snippet in IActionResult Upload method in the Controllers/FileManagerController.cs file.

[Route("Upload")]
        public IActionResult Upload(string path, IList<IFormFile> uploadFiles, string action)
        {
            try
            {
                FileManagerResponse uploadResponse;
                foreach (var file in uploadFiles)
                {
                    var folders = (file.FileName).Split('/');
                    // checking the folder upload
                    if (folders.Length > 1)
                    {
                        for (var i = 0; i < folders.Length - 1; i++)
                        {
                            string newDirectoryPath = Path.Combine(this.basePath + path, folders[i]);
                            // checking the directory traversal
                            if (Path.GetFullPath(newDirectoryPath) != (Path.GetDirectoryName(newDirectoryPath) + Path.DirectorySeparatorChar + folders[i]))
                            {
                                throw new UnauthorizedAccessException("Access denied for Directory-traversal");
                            }
                            if (!Directory.Exists(newDirectoryPath))
                            {
                                this.operation.ToCamelCase(this.operation.Create(path, folders[i]));
                            }
                            path += folders[i] + "/";
                        }
                    }
                }
                uploadResponse = operation.Upload(path, uploadFiles, action, size, null);
                if (uploadResponse.Error != null)
                {
                    Response.Clear();
                    Response.ContentType = "application/json; charset=utf-8";
                    Response.StatusCode = Convert.ToInt32(uploadResponse.Error.Code);
                    Response.HttpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase = uploadResponse.Error.Message;
                }
            }
            catch (Exception e)
            {
                ErrorDetails er = new ErrorDetails();
                er.Message = e.Message.ToString();
                er.Code = "417";
                er.Message = "Access denied for Directory-traversal";
                Response.Clear();
                Response.ContentType = "application/json; charset=utf-8";
                Response.StatusCode = Convert.ToInt32(er.Code);
                Response.HttpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase = er.Message;
                return Content("");
            }
            return Content("");
        }

Refer to the GitHub for more details

And also add the below code snippet in FileManagerResponse Upload method in Models/PhysicalFileProvider.cs file.

string[] folders = name.Split('/');
string fileName = folders[folders.Length - 1];
var fullName = Path.Combine((this.contentRootPath + path), fileName);