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I have a WebApi / MVC app for which I am developing an angular2 client (to replace MVC). I am having some troubles understanding how Angular saves a file.
The request is ok (works fine with MVC, and we can log the data received) but I can't figure out how to save the downloaded data (I am mostly following the same logic as in this post). I am sure it is stupidly simple, but so far I am simply not grasping it.
The code of the component function is below. I've tried different alternatives, the blob way should be the way to go as far as I understood, but there is no function createObjectURL in URL. I can't even find the definition of URL in window, but apparently it exists. If I use the FileSaver.js module I get the same error. So I guess this is something that changed recently or is not yet implemented. How can I trigger the file save in A2?
For the sake of completeness, the service that fetches the data is below, but the only thing it does is to issue the request and pass on the data without mapping if it succeeds:
21 Answers
The problem is that the observable runs in another context, so when you try to create the URL var, you have an empty object and not the blob you want.
One of the many ways that exist to solve this is as follows:
When the request is ready it will call the function 'downloadFile' that is defined as follows:
the blob has been created perfectly and so the URL var, if doesn't open the new window please check that you have already imported 'rxjs/Rx' ;
I hope this can help you.
Try this!
1 - Install dependencies for show save/open file pop-up
2- Create a service with this function to recive the data
3- In the component parse the blob with 'file-saver'
This works for me!
If you don't need to add headers in the request, to download a file in Angular2 you can do a simple:
in your component.
This is for folks looking how to do it using HttpClient and file-saver:
- Install file-saver
npm install file-saver --save
npm install @types/file-saver --save
API Service class:
Component:
How about this?
I could do with it.
no need additional package.
As mentioned by Alejandro Corredor it is a simple scope error. The subscribe is run asynchronously and the open must be placed in that context, so that the data finished loading when we trigger the download.
That said, there are two ways of doing it. As the docs recommend the service takes care of getting and mapping the data:
Then, on the component we just subscribe and deal with the mapped data. There are two possibilities. The first, as suggested in the original post, but needs a small correction as noted by Alejandro:
The second way would be to use FileReader. The logic is the same but we can explicitly wait for FileReader to load the data, avoiding the nesting, and solving the async problem.
Note: I am trying to download an Excel file, and even though the download is triggered (so this answers the question), the file is corrupt. See the answer to this post for avoiding the corrupt file.
Download *.zip solution for angular 2.4.x: you must import ResponseContentType from '@angular/http' and change responseType to ResponseContentType.ArrayBuffer (by default it ResponseContentType.Json)
Downloading file through ajax is always a painful process and In my view it is best to let server and browser do this work of content type negotiation.
I think its best to have
to do it. This doesn't even require any new windows opening and stuff like that.
The MVC controller as in your sample can be like the one below:
For those using Redux Pattern
I added in the file-saver as @Hector Cuevas named in his answer. Using Angular2 v. 2.3.1, I didn't need to add in the @types/file-saver.
The following example is to download a journal as PDF.
The journal actions
The journal effects
The journal service
The HTTP service
The journal reducerThough this only sets the correct states used in our application I still wanted to add it in to show the complete pattern.
I hope this is helpful.
I share the solution that helped me (any improvement is greatly appreciated)
On your service 'pservice' :
Component Part :
On the component part, you call the service without subscribing to a response. The subscribe for a complete list of openOffice mime types see : http://www.openoffice.org/framework/documentation/mimetypes/mimetypes.html
To download and show PDF files, a very similar code snipped is like below:
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I am using Angular 4 with the 4.3 httpClient object. I modified an answer I found in Js' Technical Blog which creates a link object, uses it to do the download, then destroys it.
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Client:
The value of this.downloadUrl has been set previously to point to the api. 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:
The attachment class looks like this:
The filerep repository returns the file from the database.
Hope this helps someone :)
It will be better if you try to call the new method inside you subscribe
Inside downloadFile(data) function we need to make block, link, href and file name
Update to Hector's answer using file-saver and HttpClient for step 2:
Here's something I did in my case -
The solution is referenced from - here
I got a solution for downloading from angular 2 without getting corrupt,using spring mvc and angular 2
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1st- my return type is :-ResponseEntity from java end. Here I am sending byte[] array has return type from the controller.
2nd- to include the filesaver in your workspace-in the index page as:
3rd- at component ts write this code:
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.
This was the simplest I could get (Angular 7):
Inside the service:
Then, when I need to download the file in a component, I can simply:
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Removed unnecessary header setting from service
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<a href='my_url' download='myfilename'>Download file</a>
Choose View > Show Hidden Files in the menu, then look for '.config'. The.config folder is usually hidden. How to download torrent files using transmission fluid. In that folder you'll find transmission, and the rest should be pretty straight-forward. To get there, open the File Browser and go to your home folder.
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my_url should have the same origin, otherwise it will redirect to that location