fileUploader | Dojo Demo : Multiple file uploading with pause/resume | File Upload library

What you want is a CDN, which serves image assets via a GET request (the img src accepts a string which it uses to fetch (GET) content). In short, a CDN serves the application with assets -- be it images, javascript, CSS or HTML. A React application is designed to update content in place via manipulating a virtual DOM; therefore, expecting it to serve assets across domains is anti-pattern. Instead, you would use a custom server (like express) or a web server (like nginx) to serve static assets.

As a simple example, imgur.com would the React application, while i.imgur.com would be their CDN to serve images like this and s.imgur.com would be their CDN to serve CSS/JS assets like this.

This answer goes into more detail how to do it; HOWEVER, this is only one of many, many ways on how accomplish the above, but the concept is still the same: Making a request to retrieve an image via an img src string.

I hesitate to provide full example code since I have no idea what stack you're working with and what your knowledge/comfort-level is regarding backend services. As such, if you want practice consuming a request that serves images on the frontend, then I'd recommend you start with this API service.

Here's one of many ways to do it: Example Repo

To run the example...

1.) Clone the repo: git clone git@github.com:mattcarlotta/save-canvas-example.git

2.) Install dependencies: yarn or npm i

3.) Run yarn dev or npm dev

4.) Click one of the buttons to either save an image as PNG or as a PDF

The example includes quite a bit of notes, but to provide a brief:

• User clicks button. File Ref
• Depending on the clicked button, the canvas is converted to a Blob, which is then converted to a File. File Ref
• This file is then sent (via POST) to an image microservice running at http://localhost:4000 listening for requests to /upload-file. File Ref
• The microservice sees the request and directs to our middleware functions. File Ref
• Then it directs it to the /upload-file controller. File Ref
• The controller determines if the file upload was valid (in the middleware), if not it throws an error. File Ref
• When valid, the file details are generated from req.file (this comes from our multer middleware function), a directory is created and a file is saved to that directory. File Ref
• A filepath is then sent back to the client. File Ref
• Client receives filepath from image microservice and sets it to state. File Ref
• Client then renders a shareable link, a link to view the file, and a preview. File Ref

Save PNG:

Save PDF:

Flow Diagram

If you want to use constructor injection to create an instance of FileModel in your FileUploader class you need to register it to the IoC Container. You do that by calling following method in the ConfigureServices method:

You should have autowiring configuration added to your services file:

From this code data: { CFile: e.file}, you post it as the string, so it can not be recognized as a file. You need to use FormData and change the contentType.

It looks like there is some issue with mapping between client and server. Try changing action value to the your API endpoint.

As Aluan pointed out that loadStoreUserPhotos() was actually not executed. My solution is to add setTimeout(() => window.location.reload(), 2000) to the end of uploadFile(). As a matter of fact, the solution is just simply to refresh the current page. Setting delay time is to allow user to catch whatever screen warning or notification message.

Starting from Chrome 83 version, browser blocks downloading insecure files on HTTPS.

link: https://www.chromestatus.com/feature/5691978677223424

Ok I asked this question and found the answer on my own.

What I discover is that in order to send the resized image back to user without saving the image on disk storage of server with using fs module, what I did is I converted that buffer into base64 in order convert it back into a blob in a browser since we cant make a blob in nodejs

You can define decription before render() function as below..