Tips for accessing $data in a Vue component that uses classes

Question

Tips for accessing $data in a Vue component that uses classes

Here is my component setup:

interface Data {
  selectedOption: string;
}

@Component({
})
export default class OptionSelector extends Vue {

  public data(): Data {
    return {
      selectedOption: 'None',
    };
  }

  public updateOption() {
    this.$data.selectedOption = '';
  }
}

Everything seems to be working fine, but the type of this.$data.selectedOption is showing as any instead of string even though I specified the return type in the data() method. I have tried moving the data() method inside @Component({}) but it did not solve the issue. I also tried using this.selectedOption instead but it did not compile.

Is there a method to ensure proper typing for the data object?

typescript vue.js

Answer 1

Answer №1

Keep in mind that the variable $data is defined as a Record<string, any>, meaning its properties will always have a type of any.

If you are utilizing vue-class-component (the default in a Vue CLI project), there is no need to explicitly declare the data() method. Instead, you can directly set initial data as class properties as shown below:

import { Component, Vue } from 'vue-property-decorator';

@Component
export default class TileMemory extends Vue {
  currentDirectory = '/'

  public clearDirectory() {
    this.currentDirectory = ''
  }
}

If you prefer using the data() method along with the Data interface for type safety, you can achieve this through type assertions as demonstrated:

export default class TileMemory extends Vue {
  //...

  public clearDirectory() {
    (this.$data as Data).currentDirectory = ''
  }
}

Alternatively, you can utilize a getter for easier access across multiple instances:

export default class TileMemory extends Vue {
  //...

  get $$data() {
    return this.$data as Data
  }

  public clearDirectory() {
    this.$$data.currentDirectory = ''
  }
}

Answer 2

Keep in mind that the variable $data is defined as a Record<string, any>, meaning its properties will always have a type of any.

If you are utilizing vue-class-component (the default in a Vue CLI project), there is no need to explicitly declare the data() method. Instead, you can directly set initial data as class properties as shown below:

import { Component, Vue } from 'vue-property-decorator';

@Component
export default class TileMemory extends Vue {
  currentDirectory = '/'

  public clearDirectory() {
    this.currentDirectory = ''
  }
}

If you prefer using the data() method along with the Data interface for type safety, you can achieve this through type assertions as demonstrated:

export default class TileMemory extends Vue {
  //...

  public clearDirectory() {
    (this.$data as Data).currentDirectory = ''
  }
}

Alternatively, you can utilize a getter for easier access across multiple instances:

export default class TileMemory extends Vue {
  //...

  get $$data() {
    return this.$data as Data
  }

  public clearDirectory() {
    this.$$data.currentDirectory = ''
  }
}

Answer 3

Answer №2

If you want to update the function data to a computed property, you can try something similar to the following:

interface Data {
  currentDirectory: string;
}

@Component({
})
export default class TileMemory extends Vue {

  get data(): Data {
    return {
      currentDirectory: '/',
    };
  }

  public clearDirectory() {
    this.data.currentDirectory = '';
  }
}

Answer 4

If you want to update the function data to a computed property, you can try something similar to the following:

interface Data {
  currentDirectory: string;
}

@Component({
})
export default class TileMemory extends Vue {

  get data(): Data {
    return {
      currentDirectory: '/',
    };
  }

  public clearDirectory() {
    this.data.currentDirectory = '';
  }
}

Tips for accessing $data in a Vue component that uses classes

Answer №1

Answer №2

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