For the time being, we will leave the download operation to return only a successful result and, in the meantime, start with the implementation of the client-side.
That way, we can have a clearer view of what are the potential needs of a user and how to modify the API to fulfill those needs. Changing the name to UploadController and adding Route, its end-point has changed as well, therefore we have to update the code in the upload.
Now try to run the application again and confirm that it is working as if nothing has changed! Since it is running smoothly, we can continue our refactoring journey.
It only helps us push the folders that we use frequently to the top of the project tree so that we can easily locate them. The next step is to move the logic for sending an upload request from the upload. And then inject the service to call the new method in upload. Now we can make sure once again that everything works as expected. With this, we are concluding the refactoring part and can safely move on to adding a download component to our client-side project.
While looking at the file. That said, we can extract it in a separate variable and access it through interpolation:. After the successful refactoring of the FileService, we will create a component that consumes the service and downloads our file. We will name it, respectfully, DownloadComponent, to match the one for upload that we already have. Angular CLI steps in once more with its command for a component generation:.
This time we can skip the creation of the folder because the CLI will do that for us. The behavior of the DownloadComponent will follow the general pattern — it will call the FileService, handle the response, and propagate it back to its parent component. To accomplish that, we have to add logic to the download.
With this, we can wrap up the implementation of the download operation. To choose a file to download, we first need to list those files somewhere in the application and trigger the download request with the help of the UI components. As mentioned in the beginning, we will load a list of users from the database and take their corresponding profile pictures. But to have something to show, we first need to create some users.
Code sample will help alot!!! Hello, If you simply pass observe: 'response' to the RestService , it will return the whole response object which includes headers.
Hi bunyamin, I tried this observe: 'response' but I was getting header as null, Is there any other way? Hello again, If you want to read some headers from the response of a cross origin request, the backend has to return those header names in Access-Control-Expose-Headers. You need to expose the header Content-Disposition from where cors is configured.
Hi bunyamin We did the above mentioned changes in our code so we are getting unsupported media type error in our request call. Only differance is our method call is POST. Hi, You used to be able to make your request call before. ServiceBot created 2 months ago Support Team. This question has been automatically marked as stale because it has not had recent activity. Login to react Have an answer to this question? I am using this to download attachments, so I know the id, contentType and filename: I am using an MVC api to return the file:.
Inside downloadFile data function we need to make block, link, href and file name. I added in the file-saver as Hector Cuevas named in his answer.
Using Angular2 v. The journal reducer Though this only sets the correct states used in our application I still wanted to add it in to show the complete pattern. On the component part, you call the service without subscribing to a response. The solution is referenced from - here. I found the answers so far lacking insight as well as warnings.
This is the complete example with the application part and service part after. Note that we set the observe: "response" to catch the header for the filename. Also note that the Content-Disposition header has to be set and exposed by the server, otherwise the current Angular HttpClient will not pass it on.
I added a dotnet core piece of code for that below. I got a solution for downloading from angular 2 without getting corrupt, using spring mvc and angular 2. Here I am sending byte[] array has return type from the controller. This will give you xls file format. If you want other formats change the mediatype and file name with right extension.
I was facing this same case today, I had to download a pdf file as an attachment the file shouldn't be rendered in the browser, but downloaded instead. To achieve that I discovered I had to get the file in an Angular Blob , and, at the same time, add a Content-Disposition header in the response.
Well, I wrote a piece of code inspired by many of the above answers that should easily work in most scenarios where the server sends a file with a content disposition header, without any third-party installations, except rxjs and angular.
As you can see, it's basically pretty much the average backend call from angular, with two changes. Once the file is fetched from the server, I am in principle, delegating the entire task of saving the file to the helper function, which I keep in a separate file, and import into whichever component I need to. There, no more cryptic GUID filenames! We can use whatever name the server provides, without having to specify it explicitly in the client, or, overwrite the filename provided by the server as in this example.
Also, one can easily, if need be, change the algorithm of extracting the filename from the content-disposition to suit their needs, and everything else will stay unaffected - in case of an error during such extraction, it will just pass 'null' as the filename. As another answer already pointed out, IE needs some special treatment, as always.
But with chromium edge coming in a few months, I wouldn't worry about that while building new apps hopefully. There is also the matter of revoking the URL, but I'm kinda not-so-sure about that, so if someone could help out with that in the comments, that would be awesome.
You may also download a file directly from your template where you use download attribute and to [attr. This simple solution should work on most browsers. This answer suggests that you cannot download files directly with AJAX, primarily for security reasons. So I'll describe what I do in this situation,. Add href attribute in your anchor tag inside the component.
Do all following steps in your component. If a tab opens and closes without downloading anything, i tried following with mock anchor link and it worked.
You can return a Blob object from the server and create an anchor tag and set the href property to an object URL created from the Blob. Now clicking on the anchor will download the file.
You can set the file name as well. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.
Learn more. How do I download a file with Angular2 or greater Ask Question. Asked 5 years, 9 months ago. Active 1 month ago. Viewed k times. Improve this question. Basil 1, 12 12 silver badges 19 19 bronze badges. You cannot download large files with this method. You will hit the memory limit per tab. This may be as low as GB. For large file downloads you need to specify a new tab e.
I don't think there's a clean way to get around the large file size limitation with Ajax-style requests. I am going to use here Spring Boot framework as a server side technology. I will provide link as well as button, on which user will click and download the file from server.
I will also show how to give end users Save as option while downloading file and how to display file content on the browser. Go through the following steps for creating Angular project to download file from server using Angular.
Go through the link Creating Angular Project to create a new project. Make sure you give the project name as angular-file-download. For Angular 11 , you will find another option to set whether you want to use stricter type or not.
Here I am using stricter type and later I will show you how to use stricter type for response and error. Remember the file extension ts service. Service is one of fundamental blocks of every Angular application. Service is just a TypeScript class with or even without Injectable decorator.
Once you create the service class you need to register it under app.
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