Download file core fetch response

As a security feature - it's not possible for JavaScript to start a download to your machine using AJAX - as it doesn't have access to write files to your computer. Add a comment. Active Oldest Votes. It is easier to show the difference with an example: window. To do this, you need to create an object-URL for your downloaded file and navigate to it: this.

Improve this answer. But because it's using URL. Conrado Fonseca Conrado Fonseca 2 2 gold badges 5 5 silver badges 18 18 bronze badges.

This is not exposed to the Web, but it affects which mutation operations are allowed on the headers object. Found at developer. I still don't think that explains why you would set a Content-Type on a GET request which has no body.

Kin Kin 1, 8 8 silver badges 16 16 bronze badges. Sign up or log in Sign up using Google. Widget store has a property called downloadPath. It's set to null by default. When it's value is set to null , there is no file download in progress and the Widget component does not render the FileDownload component. The store saves the downloadPath and emits a change event. Since there is now a downloadPath , Widget will render FileDownload passing in the necessary props including downloadPath as well as the handleDownloadComplete method as the value for onDownloadComplete.

However, this time downloadPath is set to null. The store saves the downloadPath as null and emits a change event. Since there is no longer a downloadPath the FileDownload component is not rendered in Widget and the world is a happy place. Improve this answer. Nate Nate 7 7 silver badges 6 6 bronze badges. The Sending form data page on MDN might be helpful. Take a look at the section titled A special case: sending files. We have a use case where we first send an Ajax request to generate a download file, then we download.

If you can use that option, you'll have more control over the headers in your Ajax request. This example is very helpful, but it still isn't clear to me how this implementation knows about whether or not the file has been downloaded. I see that the "onDownloadComplete" is called synchronously after submit, are you just making the assumption that there aren't any errors and that the server receives the request? Himmel Yes, sadly, this work around does not provide a way to confirm the file download was successful.

One possible solution could be to send an Ajax request prior to the download in Widget. Then, if successful, trigger the download. You still aren't confirming the download is successful, but if the file doesn't exist or there's some kind of network error at that time, you could handle the error. You might also want to look into putting the form in an iframe and read the iframe's content using the onload event. This is causing me to redirect.

Tony Ngo 16k 4 4 gold badges 27 27 silver badges 54 54 bronze badges. Khon Khon 1 1 silver badge 11 11 bronze badges. Right now you are parsing the response of your request as json, which is obviously not going to work for file's. Look into fetch 's response. Or refer to the answer posted here stackoverflow.

Add a comment. Active Oldest Votes. Improve this answer. Tony Ngo Tony Ngo 16k 4 4 gold badges 27 27 silver badges 54 54 bronze badges. Sign up or log in Sign up using Google. 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. On the homepage of the application, by entering credentials and uploading a picture, we can successfully create a User.

When we add a user, the profile picture will also automatically appear in a folder inside our application. For the sake of simplicity, we will show them below the user creation form. Each photo in the list will have an associated download button which will trigger the download for that particular file.

For the realization of the idea of iterating through a list of users, we first need to load the users from the database. Luckily, we already have a method in the app. Here, we also added the selector for the DownloadComponent so its template renders next to each profile picture. By clicking the download button, we will get a message that we have hit the download end-point:. With this implementation, we are manipulating the user data that we read from the database, selecting image properties, and showing them.

But what if we want to read the files directly from a folder? To be able to read from a folder, we need its path. When we access the desired folder, we pick up the files with specific extensions since we only want pictures.