Triggering a function at unpredictable intervals within an Angular application

Question

Triggering a function at unpredictable intervals within an Angular application

I am currently working on my first Angular project which is a task manager. I need to implement a feature where the addItem() function is called at random intervals. Do I need to use setTimeOut for this purpose? Also, I'm having trouble figuring out the exact placement of this function call in the component TypeScript file. No matter where I try to place it, the compiler throws an error.

Here is a snippet from my tasks.component.ts file:

 
// TypeScript code

And here's a snippet from my tasks.component.html file:

 
// HTML code

If you have any suggestions on best practices for Angular and TypeScript or how to improve the simplicity and readability of the code, please feel free to share. Thank you!

javascript angular typescript

Answer 1

Answer №1

If you want to control the speed at which your function is called, you can utilize an interval and introduce some randomness to determine the frequency of calls.

  ngOnInit() {
    // Set the minimum speed for calling the function to 250
    this.sub = interval(250)
      .pipe(
        // Generate a random number between 0 and 10
        map(() => Math.round(Math.random() * 10)),
        // Filter the random number to be within the range of 0 to 3
        // The wider the range, the more frequent the function calls
        // A narrower range will result in fewer function calls
        filter((i) => i > 0 && i < 3),
        // If the number meets the criteria, call the designated function
        tap(() => this.myFunc())
      )
      // Make sure to unsubscribe when finished to prevent unnecessary function calls.
      .subscribe();
  }

To see this concept in action, check out a live example here

Answer 2

If you want to control the speed at which your function is called, you can utilize an interval and introduce some randomness to determine the frequency of calls.

  ngOnInit() {
    // Set the minimum speed for calling the function to 250
    this.sub = interval(250)
      .pipe(
        // Generate a random number between 0 and 10
        map(() => Math.round(Math.random() * 10)),
        // Filter the random number to be within the range of 0 to 3
        // The wider the range, the more frequent the function calls
        // A narrower range will result in fewer function calls
        filter((i) => i > 0 && i < 3),
        // If the number meets the criteria, call the designated function
        tap(() => this.myFunc())
      )
      // Make sure to unsubscribe when finished to prevent unnecessary function calls.
      .subscribe();
  }

To see this concept in action, check out a live example here

Triggering a function at unpredictable intervals within an Angular application

Answer №1

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