Troubleshooting: Dealing with Stack Overflow Error when using setInterval in Vue Programming

Question

Troubleshooting: Dealing with Stack Overflow Error when using setInterval in Vue Programming

I am facing a stack overflow error while creating a timer using Vue, and I'm struggling to understand the root cause. Can someone provide insights on the following code:

Here is my template structure:

<span class="coundown-number">  {{ minutesRemaining }} : {{ secondsRemaining }}</span>
<span v-if="countdownDone"&g DONE </span>
<button v-if="running" class="custom-button" type="button" @click="runCountdown(countdownTime)">Start</button>
<input class="set-time" type="number" v-model="countdownTime" placeholder="Enter a Time in Minutes">

This is the implementation in my JavaScript file:

export default {
  name: 'Countdown',
  props: {
  },
  data() {
    return {
      running: true,
      countdownTime: null,
      remainingTime: null,
      countdownDone: false,
    }
  },
  computed: {
    minutesRemaining() {
      return (this.remainingTime - (this.remainingTime % 60)) / 60;
    },
    secondsRemaining() {
      return this.remainingTime % 60;
    },

  },
  methods: {
    runCountdown(timerTime) {
      let currentTime = timerTime*60;
      this.remainingTime = currentTime;
      if (currentTime > 0){
        currentTime--;
        setInterval(this.runCountdown(this.currentTime), 1000);
      }
      else{
        this.countdownDone = true;
      }   
    }
  }
}

I suspect the issue lies with how I'm calling the setInterval function within the same method it's being created. However, I'm unsure of an alternative approach for initialization.

If it were defined externally as

let tick = setInterval(runCountdown, 1000)

, how can I trigger it onclick? Any guidance on resolving this issue and understanding the underlying concept would be greatly appreciated.

javascript vue.js

Answer 1

Answer №1

Yes, the issue lies here:

runCountdown(timerTime) {
  let currentTime = timerTime*60;
  this.remainingTime = currentTime;
  if (currentTime > 0){
    currentTime--;
    setInterval(this.runCountdown(this.currentTime), 1000); // This specific line
  }
  else{
    this.countdownDone = true;
  }   
}

You're not passing the function as a callback, instead, you're calling it immediately and indefinitely.

The correct approach is to invoke it within a callback in the setInterval method.

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

Although setInterval will repeatedly call this function at exponential intervals, you might consider utilizing setTimeout for your needs.

setTimeout(() => { this.runCountdown(this.currentTime) }, 1000);

Answer 2

Yes, the issue lies here:

runCountdown(timerTime) {
  let currentTime = timerTime*60;
  this.remainingTime = currentTime;
  if (currentTime > 0){
    currentTime--;
    setInterval(this.runCountdown(this.currentTime), 1000); // This specific line
  }
  else{
    this.countdownDone = true;
  }   
}

You're not passing the function as a callback, instead, you're calling it immediately and indefinitely.

The correct approach is to invoke it within a callback in the setInterval method.

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

Although setInterval will repeatedly call this function at exponential intervals, you might consider utilizing setTimeout for your needs.

setTimeout(() => { this.runCountdown(this.currentTime) }, 1000);

Answer 3

Answer №2

Although Phiter's response did touch on the main question I posed, it unfortunately falls short due to a critical logic flaw in the code.

Let me address the error in my thought process:

methods: {
    runCountdown(timerTime) {
      let currentTime = timerTime*60;
      this.remainingTime = currentTime;
      if (currentTime > 0){
        currentTime--;
        setInterval(this.runCountdown(this.currentTime), 1000);
      }
      else{
        this.countdownDone = true;
      }   
    }

The problem lies in the fact that runCountdown was initially accepting time in minutes and then converting it to seconds within the function itself.

This resulted in a cycle where each callback to runCountdown from setInterval would mistakenly multiply the time by 60 again, leading to an infinite loop of multiplication and subtraction.

To resolve this issue, I introduced a computed property called countdownInSeconds to properly convert the user's input from minutes to seconds, which is then passed as the parameter to runCountdown.

Here's the revised code snippet:

<template>
  <div class="countdown">
    <h1>How long would you like to study for?</h1>
      <span class="countdown-number">  
        {{ minutesRemaining }} : {{ secondsRemaining }}</span>
        <span v-if="countdownDone">DONE</span>
      <button v-if="running" class="custom-button" type="button" 
            @click="runCountdown(countdownInSeconds)">
         Start
      </button>
    <input class="set-time" type="number" v-model="countdownTime" 
      placeholder="Enter a Time in Minutes"> 
  </div>
</template>

<script>

export default {
  name: 'Countdown',
  props: {
  },
  data() {
    return {
      running: true,
      countdownTime: null,
      remainingTime: null,
      countdownDone: false,
    }
  },
  computed: {
    countdownInSeconds(){
      return this.countdownTime * 60;
    },
    minutesRemaining() {
      return (this.remainingTime - (this.remainingTime % 60)) / 60;
    },
    secondsRemaining() {
      return this.remainingTime % 60;
    },

  },
  methods: {
    runCountdown(timerTime) {
      // assign the remainingTime to the current seconds to allow for allow for computed properties to access this loop
      this.remainingTime = timerTime;
      // if the timer time is still above 0, keep running the loop; will also need to check to see if time has been
      // paused, reset or changed
      if (timerTime > 0){
        timerTime--;
        setTimeout(() => {this.runCountdown(timerTime)}, 1000);
      }
      else{
        this.countdownDone = true;
      }   
    }
  }
}
</script>

I hope this explanation clarifies the issue at hand!

Answer 4

Although Phiter's response did touch on the main question I posed, it unfortunately falls short due to a critical logic flaw in the code.

Let me address the error in my thought process:

methods: {
    runCountdown(timerTime) {
      let currentTime = timerTime*60;
      this.remainingTime = currentTime;
      if (currentTime > 0){
        currentTime--;
        setInterval(this.runCountdown(this.currentTime), 1000);
      }
      else{
        this.countdownDone = true;
      }   
    }

The problem lies in the fact that runCountdown was initially accepting time in minutes and then converting it to seconds within the function itself.

This resulted in a cycle where each callback to runCountdown from setInterval would mistakenly multiply the time by 60 again, leading to an infinite loop of multiplication and subtraction.

To resolve this issue, I introduced a computed property called countdownInSeconds to properly convert the user's input from minutes to seconds, which is then passed as the parameter to runCountdown.

Here's the revised code snippet:

<template>
  <div class="countdown">
    <h1>How long would you like to study for?</h1>
      <span class="countdown-number">  
        {{ minutesRemaining }} : {{ secondsRemaining }}</span>
        <span v-if="countdownDone">DONE</span>
      <button v-if="running" class="custom-button" type="button" 
            @click="runCountdown(countdownInSeconds)">
         Start
      </button>
    <input class="set-time" type="number" v-model="countdownTime" 
      placeholder="Enter a Time in Minutes"> 
  </div>
</template>

<script>

export default {
  name: 'Countdown',
  props: {
  },
  data() {
    return {
      running: true,
      countdownTime: null,
      remainingTime: null,
      countdownDone: false,
    }
  },
  computed: {
    countdownInSeconds(){
      return this.countdownTime * 60;
    },
    minutesRemaining() {
      return (this.remainingTime - (this.remainingTime % 60)) / 60;
    },
    secondsRemaining() {
      return this.remainingTime % 60;
    },

  },
  methods: {
    runCountdown(timerTime) {
      // assign the remainingTime to the current seconds to allow for allow for computed properties to access this loop
      this.remainingTime = timerTime;
      // if the timer time is still above 0, keep running the loop; will also need to check to see if time has been
      // paused, reset or changed
      if (timerTime > 0){
        timerTime--;
        setTimeout(() => {this.runCountdown(timerTime)}, 1000);
      }
      else{
        this.countdownDone = true;
      }   
    }
  }
}
</script>

I hope this explanation clarifies the issue at hand!

Troubleshooting: Dealing with Stack Overflow Error when using setInterval in Vue Programming

Answer №1

Answer №2

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