Utilizing vue-property-decorator: Customizing the attributes of @Emit

After seeing the @Emit feature, I checked out the example on GitHub.

import { Vue, Component, Emit } from 'vue-property-decorator'
   @Component
   export default class YourComponent extends Vue {
      count = 0
      @Emit()
      addToCount(n: number) {
         this.count += n
      }
   }

This code snippet is similar to

export default {
  data() {
    return {
      count: 0
    }
  },
  methods: {
    addToCount(n) {
      this.count += n
      this.$emit('add-to-count', n)
    }
  }
}

Issue:

I am trying to find a way to modify the parameter n. I attempted using a return statement but it did not yield the desired result.

@Emit()
  startChange(num:any){
}

The type of the num parameter is Date. My goal is to convert it to a timestamp and send it to the parent component. How can I achieve this?

Answer №1

One way to approach this is:

@Component
export default class MyCustomComponent extends Vue {
    date: Date

    get timestamp() {
        if (this.date) {
            return this.date.getTime();
        }
    }

    startChange(date: Date) {
        this.date = date
    }

    @Watch('timestamp')
    @Emit('timestampChange')
    onTimestampChanged(timestamp: number) {
    }
}

Alternatively, you could try:

@Component
export default class MyCustomComponent extends Vue {
    timestamp: number

    startChangeByDate(date: Date) {
        this.startChangeByTimestamp(date.getTime())
    }

    @Emit('timestampChange')
    startChangeByTimestamp(timestamp: number) {
        this.timestamp= timestamp
    }
}

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