Victor Athoti. Blob function of typescript — achref akrouti. Add a comment. Active Oldest Votes. Here's some pseudo code--please excuse phat fingers. Hope this helps: MyFileUploadComponent. Improve this answer. MoMo MoMo 1, 1 1 gold badge 17 17 silver badges 37 37 bronze badges. I found this answer the best simple way to accomplish the task.
Please suggest me how to send file to server. Mohnish Karhade Mohnish Karhade 99 1 1 silver badge 11 11 bronze badges. I am getting an error in this. You use Headers and Options. Where are they imported from? Somewhere else? 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. To see it in action, let's have a look at the final version of the file upload component class, with all its features implemented:.
As we can see, we have set the reportProgress property to true in our HTTP call, and we have also set the observe property to the value events. Using the events of type UploadProgress , we are saving the ongoing upload percentage in a member variable uploadProgress , which we then use to update the value of the progress indicator bar.
We can make sure that we do so by using the RxJs finalize operator, which is going to call the reset method in both cases: upload success or failure. In our component, we store this subscription object in the uploadSub member variable.
While the upload is still in progress, the user might decide to cancel it by clicking on the cancel button. Then the cancelUpload upload method is going to get triggered and the HTTP request can be canceled by unsubscribing from the uploadSub subscription. In the final version of our file upload component, we can require the user to upload a file of a certain type, by using the requiredFileType property:.
This property is then passed directly to the accept property of the file input in the file upload template, forcing the user to select a png file from the file upload dialog. By default, the browser file selection dialog will allow the user to select only one file for upload. But using the multiple property, we can allow the user to select multiple files instead:.
Notice that this would need a completely different UI than the one that we have built. A styled upload button with a progress indicator only works well for the upload of a single file. For a multi-file upload scenario, there are a variety of UIs that could be built: a floating dialog with the upload progress of all files, etc. The way that you handle the uploaded file in your backend depends on the technology that you use, but let's give a quick example of how to do it if using Node and the Express framework.
We need to first install the express-fileupload package. We can then add this package as a middleware in our Express application:. The best way to handle file upload in Angular is to build one or more custom components, depending on the supported upload scenarios. A file upload component needs to contain internally an HTML input of type file, that allows the user to select one or more files from the file system. This file input should be hidden from the user as it's not styleable and replaced by a more user-friendly UI.
Using the file input in the background, we can get a reference to the file via the change event, which we can then use to build an HTTP request and send the file to the backend. I hope that you have enjoyed this post, if you would like to learn a lot more about Angular, we recommend checking the Angular Core Deep Dive course, where we will cover all of the advanced Angular features in detail.
Also, if you have some questions or comments please let me know in the comments below and I will get back to you. And if you are just getting started learning Angular, have a look at the Angular for Beginners Course :. Table Of Contents In this post, we will cover the following topics: How to upload files in a browser Building the user interface of a file upload component Selecting a file from the file system using a file upload dialog Uploading a file to the backend using the Angular HTTP Client How to display a file upload progress indicator How to cancel an ongoing file upload Handling the uploaded file on a Node backend How to upload multiple files Summary So without further ado, let's get started learning how to build an Angular file upload component!
How to Upload Files in a Browser In order to build an Angular file upload component, we need to first understand how to upload files in plain HTML and Javascript only , and take it from there. The key ingredient for uploading files in a browser is a plain HTML input of type file: This input will allow the user to open a browser file selection dialog and select one or more files by default, only one file.
Choose your files and click the upload button. The example that I have shared here in this post explains few things like how to upload multiple files in Angular 4 using Web API, how to use the post method in Angular and we have also learned how to post FormData object from an Angular 4 app to a Web API method.
Please enable JavaScript to view this page properly. You can use this method to upload files in Angular. Net Web API.
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