Using the "this" keyword within a debounce function will result in an undefined value

It seems that the this object becomes undefined when using a debounce function. Despite trying to bind it, the issue persists and it's difficult to comprehend what is going wrong here...

For instance, in this context this works fine and returns:

VueComponent {_uid: 6, _isVue: true, $options: {…}, _renderProxy: Proxy, _self: VueComponent, …}

<template>
    <at-ta @at="fetchMembers">
        <textarea></textarea>
    </at-ta>  
</template>

fetchMembers(at)
{
    console.log(this) // <-- VueComponent { ...
},

However, once moved within a debounce function, it stops functioning correctly and displays as:

this is undefined

fetchMembers: debounce(at => {
    axios.get(`/api/users?name=${at}`).then(({data}) => {
        this.members = data  // <-- this is undefined
    })
}, 500)

Answer №1

Make sure to bind the axios promise callback instead of the debounced function.

methods: {
  fetchMembers: debounce(function (at) {
    axios.get(`/api/users?name=${at}`).then(({data}) => {
      this.members = data
    })
  }, 500)
}

If you encountered issues, it might be due to using a fat arrow function for the debounced function, causing this to be undefined in that context.

Remember that only one debounced function is created and shared among all component instances. To address this, you can wrap fetchMembers with a debounced function in the created hook:

created() {
  this.fetchMembers = _.debounce(this.fetchMembers, 500)
},

methods: {
  fetchMembers() {
    axios.get(`/api/users?name=${at}`).then(({data}) => {
      this.members = data
    })
  }
},

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