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. This allows us to pass in a strategy for persisting the download to a file without directly coupling the operator to FileSaver. By keeping FileSaver.
The download operator can be tested without somehow mocking the saveAs import see here for corresponding tests. If we apply the same pattern to the service, we'll be able to test it just as easy.
So let's do that by creating a custom injection token for saveAs in a file called saver. Let's use the Progress Bar from Angular Material to show how far along our download is. The component now only has to assign an observable download to this property:. We can then subscribe to this observable through the AsyncPipe in combination with NgIf.
View All. Download Multiple Files as a. Zip File using Angular. Arvind Kushwaha Updated date Mar 19, This article helps you to download multiple files as a zip file using Angular and SharePoint Online. Overall, the implementation is very dynamic and thanks to valor-software for providing this implementation. In the below implementation, uploadSubmit validates the file size first and reads all the files from the queue and adds all the files in the Formdata and makes API call to upload the files.
Blow is the snippet of the controller class. The method uploadFile will execute against the API call that we make from the angular client. For an end-to-end implementation of this spring boot app, you can visit my another article here - Angular JS File Upload. Below is the final screenshot of the UI that we created above where you can upload or drag and drop multiple files.
In this article, we created an Angular 7 client application that allows multiple files uploading and enables drag and drop feature for file uploading. You can download the source code of this implementation on GItLab here. A technology savvy professional with an exceptional capacity to analyze, solve problems and multi-task. Technical expertise in highly scalable distributed systems, self-healing systems, and service-oriented architecture. File Upload React Spring Rest. Material Sidenav Example.
Angular 6 Example. Rxjs Tutorial. If Angular, where in Angular? Care to give an all-round answers. Norbert Bicsi 1, 2 2 gold badges 19 19 silver badges 33 33 bronze badges. Napoli 1, 2 2 gold badges 11 11 silver badges 24 24 bronze badges. Praveen Gubbala Praveen Gubbala 41 2 2 bronze badges. It helped me : — Ajay Malhotra. Please refer below code for file upload. DownloadFile filePath. CreateResponse HttpStatusCode. OK ; httpResponseMessage.
FileName; httpResponseMessage. Add "x-filename", fileData. Prasad Shigwan Prasad Shigwan 5 5 silver badges 14 14 bronze badges. Combine uploads, file ; if! DownloadProgress: this. Response: this. START: this. ERROR: this.
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