How can I prevent vuejs watch methods from being triggered when the value is modified by the same method?

Question

How can I prevent vuejs watch methods from being triggered when the value is modified by the same method?

monitorChanges: {
        observeValue() {
          setTimeout(() => {
            this.observeValue = "";
          }, 4000);
        }
      }

In this scenario, the observeValue function is initially invoked by the DOM, but it repeats when the value is modified by the function. Is there a way to prevent this repetitive behavior?

The objective here is to monitor any changes in the 'observeValue' and reset the value after 4 seconds if it has been altered, while also keeping track of how many times it has been modified.

javascript vue.js vuejs2

Answer 1

Answer №1

Upon Roy J's recommendation, consider implementing a change handler on the DOM rather than relying on a watcher.

new Vue({
  el: '#app',

  data() {
    return {
      alert: '',
      alertCounter: 0,

      resetTimeoutId: null,
      resetTimeoutDelay: 1000, // 4000
    }
  },

  methods: {
    reset() {
      this.incrementAlertCounter()
      this.handlePreviousResetTimeout()
      this.resetTimeoutId = setTimeout(() => {
        this.alert = ''
      }, this.resetTimeoutDelay)
    },

    handlePreviousResetTimeout() {
      if (!this.resetTimeoutId) return
      clearTimeout(this.resetTimeoutId)
    },

    incrementAlertCounter() {
      this.alertCounter += 1
    },
  },
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <input v-model="alert" type="text" @change="reset">
  <span>{{ alertCounter }}</span>
</div>

Answer 2

Upon Roy J's recommendation, consider implementing a change handler on the DOM rather than relying on a watcher.

new Vue({
  el: '#app',

  data() {
    return {
      alert: '',
      alertCounter: 0,

      resetTimeoutId: null,
      resetTimeoutDelay: 1000, // 4000
    }
  },

  methods: {
    reset() {
      this.incrementAlertCounter()
      this.handlePreviousResetTimeout()
      this.resetTimeoutId = setTimeout(() => {
        this.alert = ''
      }, this.resetTimeoutDelay)
    },

    handlePreviousResetTimeout() {
      if (!this.resetTimeoutId) return
      clearTimeout(this.resetTimeoutId)
    },

    incrementAlertCounter() {
      this.alertCounter += 1
    },
  },
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <input v-model="alert" type="text" @change="reset">
  <span>{{ alertCounter }}</span>
</div>

How can I prevent vuejs watch methods from being triggered when the value is modified by the same method?

Answer №1

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