Angular 2 notification popup for downloading a file

In a real world application alert notifications can be triggered by any type of event, for example an error from an http request or a success message after a user profile is saved. And here is the home component template containing the buttons that are bound to the above methods.

It contains methods for sending and clearing alert messages, it also subscribes to the router 'NavigationStart' event to automatically clear alert messages on route change, unless the keepAfterRouteChange flag is set to true, in which case the alert messages survive a single route change and are cleared on the next route change. In the ngOnInit method the component subscribes to the observable returned from the alertService.

The cssClass method returns a corresponding bootstrap alert class for each of the alert types, if you're using something other than bootstrap you can change the css classes returned to suit your application. The alert directive template simply displays an alert message for each alert in the alerts array. The alert model class defines the properties of each alert object, and the alert type enum defines the types of alerts allowed in the application. I'm currently attempting to travel around Australia by motorcycle with my wife Tina on a pair of Royal Enfield Himalayans.

OneSignal object without triggering any TS and compiler errors. Now that you have the globals. Now it's time to create your OneSignal service inside of your Angular app. I have created one using the Angular CLI. The name of my service file is one-signal. After creating the service, you will create an onLoad method that will ensure that the SDK script we added inside of the index. In the OneSignal service, create a new method called onInit.

Inside of the method you will call the onLoad and you will initialize OneSignal. Next, open your app. Your file will look like this:. Are you sure you want to hide this comment?

It will become hidden in your post, but will still be visible via the comment's permalink. Nikhil Bobade - Nov Mighty - Nov Esther Agbaje - Nov InHuOfficial - Nov But the Push Service might decide to block the message, if for example this subscriber has already been receiving too many messages. In most cases, what will happen is that the Push Service is going to forward the message payload to the user's browser. Once the Push Service pushes the message to the user browser, the message is then going to be decrypted and passed to the Angular Service Worker.

The end result is a system notification similar to the one that we often receive from mobile apps:. A running example of the complete code is available here on this branch on Github. The PWA features demonstrated are:. I hope that this post helps with getting started with sending Push Notifications and that you enjoyed it!

If you have some questions or comments please let me know in the comments below and I will get back to you. To get notified of upcoming posts on Progressive Web Applications and other Angular topics, I invite you to subscribe to our newsletter:. If you are just getting started learning Angular, have a look at the Angular for Beginners Course :.

Introduction to Push Notifications What we know as Web Push Notifications are actually based on two separate browser standards: Push API - this is an API that allows messages to be pushed from a server to a browser even when the site isn't focused or the browser is closed Notifications API : displays native system notifications to the user The Push API is what allows the message to be pushed from a server to the browser, and the Notifications API is what allows the message to be displayed, once it gets to the browser.

Browser Push Service Providers As we sometimes see online, Push Notifications can be very disruptive to the user, and browser implementers want to ensure that browser users have a good online experience at all times. Why identify our server as a Push source? Subscribing to Push Notifications The first thing that we will need is the Angular Service Worker, and for that here is a guide for how to add it to an existing Angular application.

Once we have the Angular Service Worker installed, we can now request the user permission for sending Push Notifications: Let's break down what is going on in this code sample: the user clicks on the Subscribe button and the subscribeToNotifications method gets executed using the swPush service, we are going to ask the user if he allows our server identified by the VAPID public key to send him Web Push messages the requestSubscription method returns a Promise which emits the push subscription object, in case the user allows notifications The user is then going to see a browser popup asking him to allow or deny the request: if the user accepts the request, the Promise returned by requestSubscription is going to be evaluated successfully, and a push subscription object is going to be passed to.

The PushSubscription object Here is what the push subscription object looks like, as we receive it in the then clause: Let's now break down the content of the subscription object, as that will help us to understand better how Push Notifications work in general: endpoint : This contains a unique URL to a Firebase Cloud Messaging endpoint. This url is a public but unguessable endpoint to the Browser Push Service used by the application server to send push notifications to this subscription expirationTime : some messages are time sensitive and don't need to be sent if a certain time interval has passed.

This is useful in certain cases, for example, if a message might contain an authentication code that expires after 1 minute pdh : this is an encryption key that our server will use to encrypt the message, before sending it to the Push Service auth : this is an authentication secret, which is one of the inputs of the message content encryption process All the information present in the subscription object is necessary to be able to send push notifications to this user.

Add a comment. Active Oldest Votes. One of the many ways that exist to solve this is as follows: this. Amr ElAdawy 3, 5 5 gold badges 32 32 silver badges 49 49 bronze badges. Alejandro Corredor Alejandro Corredor 2, 1 1 gold badge 8 8 silver badges 6 6 bronze badges. What is this. Burjua the getReport returns a this. The issue I'm having is that the window opens and closes immediately not downloading the file — Braden Brown.

How can we set file name in here? I've used the above code for downloading a file from API response but i'm getting some error in creating the Blob part "Type response is not assignable to type Blobpart".

Kindly help if anyone knows this issue — knbibin. Show 10 more comments. Try this! Hector Cuevas Hector Cuevas 1, 1 1 gold badge 6 6 silver badges 3 3 bronze badges. I used step 2 in combination with the answer from Alejandro and it worked without the need to install file-saver Thank you! It works perfectly! I wonder if we can get the filename that is defined on the header of the response. Is that possible? This one however is not suitable for big files download.

Can someone please tell why this answer is downvoted? The topic is to download a file using angular2. If this method works to do a simple download then it should also be marked as a valid answer. SaurabhShetty, This won't help in case you want to send custom headers, what if you want to send an auth token for example?

If you look into OP question you can see he uses authHttp! I do understand the downvotes, nevertheless this answer solved my issue. If you let the server return the url in some context, the server could prepare the url. The cover could be a url to an image in the server. When calling get Myrecord you let the server return the prepared url Cover , with security token and other headers set.

It is an answer that works. Show 1 more comment. Justin Justin 8 8 silver badges 11 11 bronze badges. How to show the filesize in the browser when the download starts?

I am sending the filesize as content-length in the http header. How about this? So simple yet it is the one that work flawlessly. It doesn't clutter the DOM, doesn't create any element. I combined this solution with some of the aboves and it works like a charm.

Tobias Ernst Tobias Ernst 3, 1 1 gold badge 25 25 silver badges 24 24 bronze badges. Thanks, works with Angular 8. Don't know why this was so hard to find.

I think the reason the file gets corrupted is because you are loading res into the blob and you actually want res. As of today. Have you found a solution? Still i couldn't see the file getting downloaded. I couldn't see any error as well. Please help — AishApp. The 2 options lets me download the file, but it loads the data in the background first.

What if I have a large file that has to be downloaded? It's an option, not a header. Please fix it.