Is there a more effective method for detecting changes in a class variable in JavaScript, aside from using setInterval()?

Question

Is there a more effective method for detecting changes in a class variable in JavaScript, aside from using setInterval()?

Is there a more readable way to monitor changes of a class variable from its instance?

Although I can use setInterval() to achieve this, the code becomes quite difficult to read.

let calibrator = new Calibrator("hardwareName");
calibrator.connect();

let monitoring = setInterval(() => {
    if (calibrator.getState()) { // The state will be true when there's response from hardware.
        clearInterval(monitoring);
        // lots of logic here
    } else {
        // lots of logic here
    }
}, 0);

I want the code to clearly indicate that I'm monitoring a class variable. However, using clearInterval() doesn't convey this high-level logic effectively.

Therefore, I am seeking a better approach to accomplish this task.

javascript

Answer 1

Answer №1

Absolutely! The Mutation Observer has its own API that allows you to monitor changes in the DOM. If you want to learn more, check out this link:

https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver

// Identify the specific DOM node to observe
const target = document.getElementById("your-id");

// Define the callback function for handling changes
function callback(mutationRecord, observer) {}

// Initialize a new MutationObserver instance with the callback as a parameter
const observer = new MutationObserver(callback);

// Set up the configuration options
const config = {
  childList: true
};

// Start observing the target once everything is set up
observer.observe(target, config);

Answer 2

Absolutely! The Mutation Observer has its own API that allows you to monitor changes in the DOM. If you want to learn more, check out this link:

https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver

// Identify the specific DOM node to observe
const target = document.getElementById("your-id");

// Define the callback function for handling changes
function callback(mutationRecord, observer) {}

// Initialize a new MutationObserver instance with the callback as a parameter
const observer = new MutationObserver(callback);

// Set up the configuration options
const config = {
  childList: true
};

// Start observing the target once everything is set up
observer.observe(target, config);

Answer 3

Answer №2

If you want to implement a dynamic behavior in JavaScript, consider using a Proxy.

class Example {
  constructor() {
    this.value = 0;
  }
  updateValue() {  
    this.value++;
  }
}

const handler = {
  set: (target, property, value) => {
    console.log('property:', property, ' changed to:', value);
    target[property] = value;
    return true;
  }
}

const obj = new Proxy(new Example(), handler);

for(let i = 0; i < 5; i++){
  obj.property = i;
  obj.updateValue();
}

Answer 4

If you want to implement a dynamic behavior in JavaScript, consider using a Proxy.

class Example {
  constructor() {
    this.value = 0;
  }
  updateValue() {  
    this.value++;
  }
}

const handler = {
  set: (target, property, value) => {
    console.log('property:', property, ' changed to:', value);
    target[property] = value;
    return true;
  }
}

const obj = new Proxy(new Example(), handler);

for(let i = 0; i < 5; i++){
  obj.property = i;
  obj.updateValue();
}

Is there a more effective method for detecting changes in a class variable in JavaScript, aside from using setInterval()?

Answer №1

Answer №2

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