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:

https://i.sstatic.net/RvCgR.png

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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