Utilize the reference of a prop within a callback

Question

Utilize the reference of a prop within a callback

I'm facing an issue where I am unable to reference the vue props within a callback in vue-chartjs. Whenever I try to access 'this', it gives me an 'undefined' error in the console log. Can someone please advise on the correct way to access the prop?

props: {
  test: {
    type: String,
    required: true,
  },
}
data: () => ({
  chartOptions: {
    tooltips: {
      callbacks: {
        label: function(tooltipItem, data) {
            console.log(this.test);
            return '';
        }
      }
    }
  }
});

javascript vue.js vuejs2 vue-component vue-chartjs

Answer 1

Answer №1

If you wish to access this within your data, it is necessary to use a regular function so that the context of the Vue instance binds correctly to the this keyword.


export default {
    props: {
        test: {
            type: String,
            required: true,
        },
    },
    data() {
        const vm = this
        return {
            chartOptions: {
                tooltips: {
                    callbacks: {
                        label: function(tooltipItem, data) {
                            console.log(vm.test);
                            return '';
                        }
                    }
                }
            }
        }
    }
}

Answer 2

If you wish to access this within your data, it is necessary to use a regular function so that the context of the Vue instance binds correctly to the this keyword.


export default {
    props: {
        test: {
            type: String,
            required: true,
        },
    },
    data() {
        const vm = this
        return {
            chartOptions: {
                tooltips: {
                    callbacks: {
                        label: function(tooltipItem, data) {
                            console.log(vm.test);
                            return '';
                        }
                    }
                }
            }
        }
    }
}

Answer 3

Answer №2

Consider utilizing an arrow function and setting chartOptions as a computed property :

computed:{
  chartOptions(){
    return {
      tooltips: {
         callbacks: {
        label: (tooltipItem, data)=> {
            console.log(this.dataValue);
            return '';
        }
      }
    }
  }
}

}

Answer 4

Consider utilizing an arrow function and setting chartOptions as a computed property :

computed:{
  chartOptions(){
    return {
      tooltips: {
         callbacks: {
        label: (tooltipItem, data)=> {
            console.log(this.dataValue);
            return '';
        }
      }
    }
  }
}

}

Utilize the reference of a prop within a callback

Answer №1

Answer №2

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