This one however is not suitable for big files download. Can someone please tell why this answer is downvoted? The topic is to download a file using angular2. If this method works to do a simple download then it should also be marked as a valid answer. SaurabhShetty, This won't help in case you want to send custom headers, what if you want to send an auth token for example? If you look into OP question you can see he uses authHttp! I do understand the downvotes, nevertheless this answer solved my issue.
If you let the server return the url in some context, the server could prepare the url. The cover could be a url to an image in the server. When calling get Myrecord you let the server return the prepared url Cover , with security token and other headers set. It is an answer that works. Show 1 more comment. Justin Justin 8 8 silver badges 11 11 bronze badges. How to show the filesize in the browser when the download starts? I am sending the filesize as content-length in the http header. How about this?
So simple yet it is the one that work flawlessly. It doesn't clutter the DOM, doesn't create any element. I combined this solution with some of the aboves and it works like a charm. Tobias Ernst Tobias Ernst 3, 1 1 gold badge 25 25 silver badges 24 24 bronze badges. Thanks, works with Angular 8. Don't know why this was so hard to find. I think the reason the file gets corrupted is because you are loading res into the blob and you actually want res.
As of today. Have you found a solution? Still i couldn't see the file getting downloaded. I couldn't see any error as well.
Please help — AishApp. The 2 options lets me download the file, but it loads the data in the background first. What if I have a large file that has to be downloaded? It's an option, not a header. Please fix it. The headers are created and not used. Not helpful. Show 11 more comments. Alex Dzeiko Alex Dzeiko 11 11 silver badges 12 12 bronze badges. This doesn't even require any new windows opening and stuff like that.
Massimiliano Kraus 3, 5 5 gold badges 22 22 silver badges 44 44 bronze badges. GingerBeer GingerBeer 8 8 silver badges 11 11 bronze badges. You're right, but then how can you manage server errors within the single-page application? If you have an access token you need to provide this doesn't work — chris This is plain and simple. But if you wanna do some authentication, then there is a possibility of having something like a one time token.
So, instead of having it like this, you can have the url as: example. Of course its not a simple scenario and works in all the situations, but can be a solution in situation where, you have access to the database before returning the report as a stream.. Get the download url from the server. So the server can prepare the url with onetime security token. FileBytes, AT. Hope this helps someone :. It will be better if you try to call the new method inside you subscribe this.
Volodymyr Khmil Volodymyr Khmil 11 11 silver badges 11 11 bronze badges. The following example is to download a journal as PDF. There are two parameters in saveAs function. The one success is for data and the other one fileName is for file name. Do you have any suggestions? So, give the file name and then the error will be gone. Very Thanks mebakar error is this is your api root url return this. I am using swagger for APIs in my project.
Blob in angular 8. Your email address will not be published. Notify me of follow-up comments by email. This way our components can be decoupled from the underlying network protocol. Since we're dealing with multiple events coming in over time, a RxJS operator is well suited here - so let's create one! The first step for this will be the creation of type guards helping us to distinguish different HTTP events. This way we can access event-specific fields in a type-safe way.
They both contain the discriminator field type allowing us to easily return a boolean for the type assertion in our guards. The guards can be used with a simple if-statement, however, TypeScript will narrow the event type inside the statement block for us:. Based on these guards we can now create our custom operator. It'll leverage scan , an operator that allows us to accumulate state for successive values coming through an observable.
It takes up to two arguments: First, we provide an accumulator function which will compute the next Download state from the previous one and the current HttpEvent. Second, we'll pass a seed to scan representing the initial Download state. This seed will represent our download being pending without any progress or content:. Our accumulator will use the previously defined guard to update the Download state over time with information from the HTTP events:.
When we encounter a HttpProgressEvent , we calculate the progress based on the number of bytes already loaded and the total bytes. A download is done when we receive a HttpResponse containing the file contents in its body. When receiving any other events than HttpProgressEvent or HttpResponse , we won't alter the download's state and return it as it is. This way, for example, we can keep the information in the progress property while other events that won't allow us to compute the progress can be ignored for now.
Anything unclear? Let's finally define our custom operator that's using scan with our accumulator and seed :. Notice that this download operator accepts an optional parameter saver. Once a HTTP response is received, this function is invoked with the download content from inside the accumulator.
At this point, we can create an Angular project with the CLI, with which we want to upload files, display and download them. Moreover, we will show the progress during download and upload, using one of the Angular HttpClient functionalities.
We will create a specific component for each operation, Upload and Download, and we will use it from a FileManager component, that shows the list of downloaded files. Compared to the classical use of HttpClient, that you can display in the method getFiles , in dowloadFile and uploadFile we use the request method, that permits us to specify a HttpRequest with all its options, among them the option reportProgress set on true.
This option enables us to receive updates on the exchange data status between client and server. We can see that in our Upload component:. As you can see, the subscription to the observable returned from the HttpClient gives us an HttpEvent type object, which property type can acquire one of these five values:. If you want to level out events between upload and download and abstract us from the http library, we add our enumeration and our interface to the project:.
Clicking on the button, the input selection window will open, allowing the user to select a file. On the input change, we recall the component upload method. As the operation ends, both in case of success and of error, you need to clean out selection input, or it would not be possible to make the upload of the same file consecutively.
To do that, you can use both ReactiveForm and associate it a FormControl to the input, and with ngModel , cleaning out the bound property. We can make a similar procedure for the download, but we should insert a further requisite: we want to download the file, update the progress and supply the downloaded file to a user with no more interaction. The component logic is very similar to that of the upload, but, as we know, once the download is terminated, we want to supply the file to user immediately.
After that, we can delete the created anchor. Ugly, maybe. The better thing to do would probably be to move the whole manipulation part in a guideline, but, for the purposes of our reasoning, it would not make the much difference: I leave it to you as exercise! We use both component from the FileManager component and there you have it.
0コメント