The responsive default value for props

Given the following code snippet:

  props: {
    id: {
      type: String,
      default() {
        return this.$route.params.id;
      },
    },
  },

If the parent component does not pass a value, one would expect the id prop to update whenever the route changes to a new id. However, it appears that is not happening in reality. Is my understanding accurate? Is there a way to make the id prop reactive in this scenario? Otherwise, I am considering setting required: false and creating a computedId field, although I prefer handling it directly within the props section.

Answer №1

It is not advisable to set a default value directly in props based on a variable because the default property in props is intended for static values, not reactive values.


Using a computed value instead of props in your template can lead to better coding habits.

<div>{{ computedId }}</div>

props: {
    id: {
      type: String,
    },
  },
  computed: {
     computedId() {
        return this.value || this.$route.params.id
     }
  }

Answer №2

Perhaps it would be more efficient to utilize a computed property instead? Another option could be implementing a watcher to follow changes in the ID and trigger a manual refresh, although the process of directly setting this action within the props is not entirely clear to me.

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