Using VueJS: Updating component data with a function within a method

Question

Using VueJS: Updating component data with a function within a method

I'm attempting to perform a search using Firebase within my VueJS Code.

export default {
  data () {
    return {
      listings: [],
      searchData: {
        keyword: ""
      }
    }
  },
  name: 'SearchScreen',
  components: {
    ValidationProvider,
    ValidationObserver
  },
  firebase: {
    listings: listingsRef
  },
  methods: {
    search () {
      console.log(this.searchData.keyword)
      listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', function (snapshot){
        console.log(snapshot.val())
        return{
          listings: snapshot.val()
        }
      })
    }
  }
}

Upon calling console.log, the data is being successfully filtered and displayed in the console. However, I am facing difficulty updating the 'listings' in the component data with the response received from Firebase. Attempted using this.listing, but it was not effective. How can I overcome this issue?

javascript firebase vue.js firebase-realtime-database vuejs2

Answer 1

Answer №1

To ensure proper scope, it's recommended to assign the component instance (this) to a global variable named vm. Then, within the callback function, you can assign the value of snapshot.val() to the listing data property in the following manner:

 search () {
      console.log(this.searchData.keyword)
       let vm = this;
      listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', function (snapshot){
        console.log(snapshot.val())

          vm.listings = snapshot.val()

      })
    }

Alternatively, you can use an arrow function as the callback like so:

 search () {
      console.log(this.searchData.keyword)
      listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', (snapshot) => {
        console.log(snapshot.val())

          this.listings = snapshot.val()

      })
    }

Answer 2

To ensure proper scope, it's recommended to assign the component instance (this) to a global variable named vm. Then, within the callback function, you can assign the value of snapshot.val() to the listing data property in the following manner:

 search () {
      console.log(this.searchData.keyword)
       let vm = this;
      listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', function (snapshot){
        console.log(snapshot.val())

          vm.listings = snapshot.val()

      })
    }

Alternatively, you can use an arrow function as the callback like so:

 search () {
      console.log(this.searchData.keyword)
      listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', (snapshot) => {
        console.log(snapshot.val())

          this.listings = snapshot.val()

      })
    }

Answer 3

Answer №2

To ensure proper binding within your function, consider using this in the following way:

listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', function (snapshot){
    this.listings = snapshot.val()
}.bind(this))

Check out more information here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind

Answer 4

To ensure proper binding within your function, consider using this in the following way:

listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', function (snapshot){
    this.listings = snapshot.val()
}.bind(this))

Check out more information here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind

Answer 5

Answer №3

Integrate the component into the search feature by referencing it.

thisElement = this

Next, within the function (snapshot), assign a value to thisComponent.searchData.keyword.

let searchTerm = "example"
thisElement.searchData.keyword = searchTerm

Answer 6

Integrate the component into the search feature by referencing it.

thisElement = this

Next, within the function (snapshot), assign a value to thisComponent.searchData.keyword.

let searchTerm = "example"
thisElement.searchData.keyword = searchTerm

Using VueJS: Updating component data with a function within a method

Answer №1

Answer №2

Answer №3

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