What is the best way to invoke a function every 10 seconds in Angular 2?

Question

What is the best way to invoke a function every 10 seconds in Angular 2?

Is it possible to call a function at specific time intervals in Angular 2? I want the function to be triggered every 10 seconds. For example:


num: number = 0;
array: number[] = [1,5,2,4,7];
callFuntionAtIntervals(){
    if(num==5){
        num=0;    
    }
    num++;
}

HTML:

<div>{{ array[num] }}</div>

Essentially, the div value will change at set intervals.

angular typescript angular2-template

Answer 1

Answer №1

Repeating function calls: Observable.interval(10000).takeWhile(() => true).subscribe(() => this.function());

This code creates an infinite loop that calls the function() every 10 seconds.

Answer 2

Repeating function calls: Observable.interval(10000).takeWhile(() => true).subscribe(() => this.function());

This code creates an infinite loop that calls the function() every 10 seconds.

Answer 3

Answer №2

Another option to consider is using the standard setInterval method.

setInterval(() => {
    this.performTaskAtRegularIntervals();
}, 1000);

Answer 4

Another option to consider is using the standard setInterval method.

setInterval(() => {
    this.performTaskAtRegularIntervals();
}, 1000);

Answer 5

Answer №3

Create a TS logic where you establish an observable that is triggered by an "interval", leading to the emission of values 0, 1, 2, 3, 4, 0, 1, and so on.

this.currentIndex = Observable.interval(10000).map(num => num % this.dataArray.length);

Within your component, extract this observable using async and utilize it for indexing purposes within the array.

{{dataArray[currentIndex | async]}}

Answer 6

Create a TS logic where you establish an observable that is triggered by an "interval", leading to the emission of values 0, 1, 2, 3, 4, 0, 1, and so on.

this.currentIndex = Observable.interval(10000).map(num => num % this.dataArray.length);

Within your component, extract this observable using async and utilize it for indexing purposes within the array.

{{dataArray[currentIndex | async]}}

Answer 7

Answer №4

Here are some helpful insights for you:

In my case, the requirement was to call a service every 5 seconds and stop calling once we receive the necessary data. If the required data is not received, the service should be called again after another 5 seconds.

The conditions to stop invoking the service included reaching the maximum number of retries (20 times in my scenario) or a specific time limit (120 seconds in my situation).

Note: The implementation was done using TypeScript.

let maxTimeToRetry = 120000;  // in ms
let retryCount = 0;
let retryTimeout = 5000; // in ms
let maxRetries = 20;
const startTime = new Date().getTime();

// It's important to use 'self' within this context when working inside the setInterval method;

const interval = setInterval(function () {
    retryCount++;  // INCREMENT RETRY COUNTER
    self.service.getData(requestParams).subscribe(result => {
      if (result.conditionTrue) {
        clearInterval(interval); // to stop the timer or further service calls
        // Any additional actions after retrieving data
      }
    });

    if ((new Date().getTime() - startTime > maxTimeToRetry) || (retryCount === maxRetries)) {
      clearInterval(interval);
      // Additional actions 
    }

  }, retryTimeout);

Answer 8

Here are some helpful insights for you:

In my case, the requirement was to call a service every 5 seconds and stop calling once we receive the necessary data. If the required data is not received, the service should be called again after another 5 seconds.

The conditions to stop invoking the service included reaching the maximum number of retries (20 times in my scenario) or a specific time limit (120 seconds in my situation).

Note: The implementation was done using TypeScript.

let maxTimeToRetry = 120000;  // in ms
let retryCount = 0;
let retryTimeout = 5000; // in ms
let maxRetries = 20;
const startTime = new Date().getTime();

// It's important to use 'self' within this context when working inside the setInterval method;

const interval = setInterval(function () {
    retryCount++;  // INCREMENT RETRY COUNTER
    self.service.getData(requestParams).subscribe(result => {
      if (result.conditionTrue) {
        clearInterval(interval); // to stop the timer or further service calls
        // Any additional actions after retrieving data
      }
    });

    if ((new Date().getTime() - startTime > maxTimeToRetry) || (retryCount === maxRetries)) {
      clearInterval(interval);
      // Additional actions 
    }

  }, retryTimeout);

What is the best way to invoke a function every 10 seconds in Angular 2?

Answer №1

Answer №2

Answer №3

Answer №4

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