Starting data initialization using a property object within a Vue component

Question

Starting data initialization using a property object within a Vue component

I am encountering an issue with two Vue components, EventTask and EventCard. Within EventTask, there is a currentEvent object in the data section, which I pass as a prop to EventCard using the following code snippet:

<event-card :current-event="currentEvent" />

Within the EventCard component, I attempt to initialize an event data property based on the currentEvent prop. I followed advice from this answer.

export default {
  name: 'EventCard',
  props: {
    currentEvent: {
      type: Object,
      required: false
    }
  },
  data: function () {
    return {
      event: { ...this.currentEvent }
    }
  }
}

Despite my efforts, I am facing an issue where the event data property fails to be set accurately. The Vue developer tools display an unexpected outcome as shown below:

The event data property appears empty while the currentEvent prop contains multiple properties. Why is the initialization of the data property not aligning correctly with the prop?

javascript vue.js

Answer 1

Answer №1

If the variable currentEvent is updated after the initialization of EventCard, it can cause issues. Keep in mind that changes to currentEvent will not re-initialize event since the data() function is not triggered reactively.

An effective solution is to implement a watcher on the currentEvent variable to copy its value to the event variable:

export default {
  watch: {
    currentEvent(newValue) {
      this.event = { ...newValue }
    }
  }
}

Check out this demonstration for more information.

Answer 2

If the variable currentEvent is updated after the initialization of EventCard, it can cause issues. Keep in mind that changes to currentEvent will not re-initialize event since the data() function is not triggered reactively.

An effective solution is to implement a watcher on the currentEvent variable to copy its value to the event variable:

export default {
  watch: {
    currentEvent(newValue) {
      this.event = { ...newValue }
    }
  }
}

Check out this demonstration for more information.

Answer 3

Answer №2

Feel free to experiment with this code snippet:

export default {
  name: 'EventCard',
  props: {
    currentEvent: {
      type: Object,
      required: false
    }
  },
  data: function () {
    return {
      event: null
    }
  },
  mounted () {
    this.event = this.currentEvent // You might want to consider cloning here as well.
  }
}

Answer 4

Feel free to experiment with this code snippet:

export default {
  name: 'EventCard',
  props: {
    currentEvent: {
      type: Object,
      required: false
    }
  },
  data: function () {
    return {
      event: null
    }
  },
  mounted () {
    this.event = this.currentEvent // You might want to consider cloning here as well.
  }
}

Answer 5

Answer №3

If you're looking for a different approach, give this a try:

export default {
  name: 'CustomComponent',
  props: {
    inputData: {
      type: Object,
      required: false
    }
  },
  data: function () {
    return {
      dataItem: this.inputData
    }
  }
}

Check out the original source here: https://v2.vuejs.org/v2/guide/components-props.html#One-Way-Data-Flow

Answer 6

If you're looking for a different approach, give this a try:

export default {
  name: 'CustomComponent',
  props: {
    inputData: {
      type: Object,
      required: false
    }
  },
  data: function () {
    return {
      dataItem: this.inputData
    }
  }
}

Check out the original source here: https://v2.vuejs.org/v2/guide/components-props.html#One-Way-Data-Flow

Starting data initialization using a property object within a Vue component

Answer №1

Answer №2

Answer №3

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