Allow a function to automatically stop after a specific duration

Question

Allow a function to automatically stop after a specific duration

I'm in the process of developing a mobile application with the Ionic 2 framework, utilizing Angular 2.

One of the features I have implemented is a FileUpload option, which unfortunately experiences delays in cases of poor internet connections or app malfunctions. My goal is to set a timeout for this file upload after 7 seconds.

Is there a way to achieve this timeout within Angular 2?

My initial thought was to implement a workaround similar to the following (for demonstration purposes only, not actual code):

let doneUploading: boolean = false;
this.http.post(url, data, options).subscribe(response => {
   doneUploading = true;
   ....
}, err => {
   doneUploading = true;
   ....
});

setTimeout(()=> {
  if(!doneUploading) {
    alert("TIMEOUT");
  }
}, 7000);

Although this workaround gets the job done, it feels somewhat hacky. Is there a more streamlined solution within Angular 2, or should I stick with this workaround?

angular typescript ionic2

Answer 1

Answer №1

One useful feature in RxJS is the availability of .timeout() and .timeoutWith methods on Observable objects.

By using these methods, you can set a timeout for an HTTP post request like this:
let subscription = this.http.post(url, data, options)
    .timeout(7000, new Error("TIMEOUT"))
    .subscribe(response => {
    },
    err => {
       alert(err);
    });

For more information on how to use .timeout(), you can visit this link.

Answer 2

One useful feature in RxJS is the availability of .timeout() and .timeoutWith methods on Observable objects.

By using these methods, you can set a timeout for an HTTP post request like this:
let subscription = this.http.post(url, data, options)
    .timeout(7000, new Error("TIMEOUT"))
    .subscribe(response => {
    },
    err => {
       alert(err);
    });

For more information on how to use .timeout(), you can visit this link.

Answer 3

Answer №2

If your main concern is to prevent the callback from being executed after 7 seconds, you can achieve this by unsubscribing from your observable within that timeframe:

const subscription = this.http.post(url, data, options)
    .subscribe(response => {
    },
    err => {
    });
setTimeout(() => {
    subscription.unsubscribe();
}, 7000);

Answer 4

If your main concern is to prevent the callback from being executed after 7 seconds, you can achieve this by unsubscribing from your observable within that timeframe:

const subscription = this.http.post(url, data, options)
    .subscribe(response => {
    },
    err => {
    });
setTimeout(() => {
    subscription.unsubscribe();
}, 7000);

Allow a function to automatically stop after a specific duration

Answer №1

Answer №2

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