Angular 2 TypeScript: Accelerating the Increment Number Speed

Question

Angular 2 TypeScript: Accelerating the Increment Number Speed

I'm working with a function in Angular 4 that is triggered when the arrow down key is pressed. Each time the arrow down key is hit, the counter increments by 1. In this function, I need to run another function if the counter reaches a certain speed.

 activeIndex = 0;

 if (event.code === "ArrowDown") { 
        this.activeIndex++ // Counter increments each time arrow down is clicked

  if (this.activeIndex === "the desired speed"){ 
     alert("The other function will be fired because the speed was reached.")
    }

Is there a way to calculate the speed at which the counter increments?

javascript angular typescript time

Answer 1

Answer №1

I am struggling to grasp the concept of "speed of increment++", and I will interpret it as "the interval between each event call."

If this is the case, you can keep track of the time elapsed between each event call like so:

let lastKeyDownEvent = undefined;
const INTERVAL = 5000;

function onKeyDown(event) {
    if (event.code === "ArrowDown") {
        let currentKeyDownEvent = new Date().getTime();
        if (lastKeyDownEvent) {
            if ((currentKeyDownEvent - lastKeyDownEvent) < INTERVAL) {
                console.log('Events triggered in under ' + INTERVAL + ' milliseconds')
            } else {
                console.log('Events triggered in over ' + INTERVAL + ' milliseconds');
            }
        }
        lastKeyDownEvent = currentKeyDownEvent;
    }
}

You can customize the keydown function to include any additional functionality you require.

Alternatively, you can utilize setTimeout to regulate your events:

let eventTimeout = undefined;
const INTERVAL = 5000;

function onKeyDown(event) {
    if (event.code === "ArrowDown") {
        if (eventTimeout) {
            clearTimeout(eventTimeout);
        }
        eventTimeout = setTimeout(function () {
            console.log("No event has occurred within " + INTERVAL + " milliseconds.")
        }, INTERVAL);
    }
}

Answer 2

I am struggling to grasp the concept of "speed of increment++", and I will interpret it as "the interval between each event call."

If this is the case, you can keep track of the time elapsed between each event call like so:

let lastKeyDownEvent = undefined;
const INTERVAL = 5000;

function onKeyDown(event) {
    if (event.code === "ArrowDown") {
        let currentKeyDownEvent = new Date().getTime();
        if (lastKeyDownEvent) {
            if ((currentKeyDownEvent - lastKeyDownEvent) < INTERVAL) {
                console.log('Events triggered in under ' + INTERVAL + ' milliseconds')
            } else {
                console.log('Events triggered in over ' + INTERVAL + ' milliseconds');
            }
        }
        lastKeyDownEvent = currentKeyDownEvent;
    }
}

You can customize the keydown function to include any additional functionality you require.

Alternatively, you can utilize setTimeout to regulate your events:

let eventTimeout = undefined;
const INTERVAL = 5000;

function onKeyDown(event) {
    if (event.code === "ArrowDown") {
        if (eventTimeout) {
            clearTimeout(eventTimeout);
        }
        eventTimeout = setTimeout(function () {
            console.log("No event has occurred within " + INTERVAL + " milliseconds.")
        }, INTERVAL);
    }
}

Angular 2 TypeScript: Accelerating the Increment Number Speed

Answer №1

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