An in-depth guide on implementing debounce functionality for `keyup` events in Vue.js

I am attempting to detect when the user begins typing and stops typing using the debounce function. I experimented with Lodash and Underscore.js.

On my textArea
                               v-on:keyup="handler($event)"
handler: function(e) {
             this.e = e
             if(this.canPublish) {
                 this.setCanNotPublish()
                 this.doStuff()
             }

             var debounceFunction = _.debounce(this.doneTyping(), 5000)
             debounceFunction(e)

         },

I am becoming quite frustrated with this issue. I successfully achieved it in pure JavaScript, but with Vue.js, where it involves v-on events, data, methods, etc., I'm facing challenges.

Method doneTyping

doneTyping: function () {
                console.log('done typing....')
            }

}

Method doStuff

doStuff: function () {
             console.log('started typing....')
         }

The desired functionality is as follows: initially, when the user starts typing in the textArea, doStuff should be triggered. If the user continues typing within a 5-second interval, doStuff won't be activated again due to the boolean canPublish. When the user stops typing, the debounce function finishes its delay, and doneTyping is executed.

Answer №1

To optimize this scenario, I suggest using two debounced functions: one for detecting when typing starts (triggering on the leading edge) and one for determining when typing stops (triggering on the trailing edge).

new Vue({
  el: '#app',
  
  created() {
    this.startedTyping = _.debounce(this.startedTyping, 5000, {
      leading: true,
      trailing: false,
    })
    this.stoppedTyping = _.debounce(this.stoppedTyping, 5000, {
      leading: false,
      trailing: true,
    })
  },
  
  methods: {
    handleKeydown() {
      // Triggers at the start of typing
      this.startedTyping()

      // Triggers after typing has stopped (after 5s)
      this.stoppedTyping()
    },
    
    startedTyping() {
      console.log('started typing')
    },
    
    stoppedTyping() {
      console.log('stopped typing')
    },
  },
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.19/lodash.min.js"></script>

<div id="app">
  <textarea @keydown="handleKeydown"></textarea>
</div>

Your current code is creating a new debounced function every time the handler is called. To avoid this issue, it's recommended to create only one instance of the debounced function that you call each time in the created hook.

Commonly, developers use the following approach:

methods: {
  myDebouncedFunc: _.debounce(function () {
    // Do stuff
  }, 1000)
}

While technically correct, this method shares the debounced function across all component instances, which may not be ideal. For better practice, create the debounced function in the created hook to ensure each component instance has its own independent debouncing mechanism.

Answer №2

Learn how to implement debouncing in your code.

handleInput: _.debounce(function (input) {
    console.log('Input has been debounced....')
}, 3000)

Now, you can integrate it like this:

processInput: function(inputData) {
    this.inputData = inputData;
    if(this.readyToProcess){
        this.setNotReady()
        this.runProcessingLogic()
    }

    this.handleInput() // The function is now debounced
},

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