Open and edit the uploaded files in Angular Uploader component

19 Mar 20245 minutes to read

The uploader component allows you to modify the file after uploading to the server, which can be achieved using success event of the uploader.

You can retrieve the saved file path in the uploader success event and assign it to custom attribute (data-file-name) value of the respective file list element to open the uploaded file. Click the respective file element to create a new request along with saved file path using http header. In the server-side, get the file path from the header and open the file using process.start method.

import { Component } from '@angular/core';
import { EmitType } from '@syncfusion/ej2-base';

@Component({
    selector: 'app-root',
    template: '<div class="control_wrapper"> <ejs-uploader #defaultupload id='fileupload' [asyncSettings]='path' (success)='onUploadSuccess($event)'></ejs-uploader></div>'
})
export class AppComponent {

   public path: Object = {
       saveUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Save',
       removeUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Remove'
   };
    public onUploadSuccess: EmitType<Object> = (args: any) => {
        let liElements: any = document.body.querySelectorAll('.e-upload-file-list');
        for (let i = 0; i < liElements.length; i++) {
            if (liElements[i].getAttribute('data-file-name') == args.file.name) {
                liElements[i].addEventListener('click', () => { this.openFile(args, event); });
                // File path have to update from server end in response status description.
                liElements[i].setAttribute('file-path', args.e.target.statusText);
            }
        }
   };
   openFile(args: any, e: any) {
    if (!e.target.classList.contains('e-file-delete-btn') && !e.target.classList.contains('e-file-remove-btn'))
    {
        let ajax = new XMLHttpRequest();
        // create new request for open the selected file
        ajax.open("POST", '/Home/openFile');
        let liElements = document.getElementsByClassName('e-upload')[0].querySelectorAll('.e-upload-file-list');
        for (let i = 0; i < liElements.length; i++) {
            if (liElements[i].getAttribute('data-file-name') == args.file.name) {
                // Added the file path in header to get it in server side.
            ajax.setRequestHeader('filePath', liElements[i].getAttribute('file-path').toString());
            }
        }
        ajax.send();
    }
}
}

Server side for open and edit the uploaded files

public void Save() {
    if (!System.IO.File.Exists(fileSavePath))
    {
        httpPostedFile.SaveAs(fileSavePath);
        HttpResponse Response = System.Web.HttpContext.Current.Response;
        Response.Clear();
        Response.ContentType = "application/json; charset=utf-8";
        // Sending the file path to client side
        Response.StatusDescription = fileSavePath;
        Response.End();
    }
}

[AcceptVerbs("Post")]
public void openFile()
{
    // Check whether the file is available in the corresponding location
    if (System.IO.File.Exists(Request.Headers.GetValues("filePath").First()))
    {
        // This will open the selected file from server location in desktop
        Process.Start(Request.Headers.GetValues("filePath").First());
    }
}

You can also explore Angular File Upload feature tour page for its groundbreaking features. You can also explore our Angular File Upload example to understand how to browse the files which you want to upload to the server.