Go through the following steps for creating Angular project to download file from server using Angular. Go through the link Creating Angular Project to create a new project. Make sure you give the project name as angular-file-download. For Angular 11 , you will find another option to set whether you want to use stricter type or not. Here I am using stricter type and later I will show you how to use stricter type for response and error. Remember the file extension ts service. Service is one of fundamental blocks of every Angular application.
Service is just a TypeScript class with or even without Injectable decorator. Once you create the service class you need to register it under app. Injectable is a decorator that has a property providedIn. When the service is provided at root level, Angular creates a single, shared instance of service and injects into any class that needs it.
Registering the provider in the Injectable metadata also allows Angular to optimize an application by removing the service if it is not used. You can either use the browser builtin JavaScript APIs to create custom elements or use existing libraries that abstracts away all the complexities involved in creating web components with vanilla JavaScript. Some popular libraries include:. Head back to your terminal and run the following command:.
You will be asked if you Would you like to add Angular routing? Enter No as we will not need routing in our example and Which stylesheet format would you like to use?
Choose CSS. Angular Elements allows you to transform an Angular component to a custom element web component. You can easily create a custom element and the package will take care of converting the required Angular functionality to the corresponding native HTML APIs.
You can set up Angular Elements in your Angular project very easily using the ng add command. You can solve this issue in many ways. For example, open the tsconfig. This will tell the TypeScript compiler to compile your source code to ES6 instead of ES5 which means you will not be able to target old browsers including Internet Explorer.
So if this is not an option, you can apply other fixes that you can find from this GitHub issue. A component controls a view which is a part of the screen. 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.
While the download is pending we'll display the progress bar in 'buffer' mode you may also use 'query' , otherwise the progress is determinate. The bar's value can then easily be applied from Download. Pro Tip : If you need to map something to more than two values inside a template or rather a ternary statement won't do it for you: map the observable to the type you need or use a custom pipe instead of calling a component function from the template. Both methods are pretty easy to write, more declarative and perform better.
Here's a StackBlitz showing everything in action. The downloaded file is only 3MB, so you might want to enable throttling to see more of the progress bar. I hope this article helped you with your project. Hire me , if you need further support solving your specific problem.
Sometimes even just a quick code review or second opinion can make a great difference. With Sentry it's easy to log Angular errors server-side. In this example we create a designated service to track errors better than the browser console. Saving changes automatically to the server improves user-experience. Angular File Download with Progress March 10, web development frontend angular.
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