Issue with VueJS v-for when using dynamic components causing unexpected behavior

Within one of my components, the syntax I am using is as follows:

<event-item v-for='(event, index) in events'
            :is='eventComponent(event)'
            :key="'event-' + index"
            :event='event'>
</event-item>

Initially, the list is rendered correctly.

However, an unexpected behavior occurs when I prepend a new element to the events array using events.unshift(event). In this case, the event-item component for the event at index n displays properties of the event at index n+1.

This issue does not arise when I use events.push(event), but this is not a viable solution as I need to add new events to the beginning of the list.

Answer №1

The issue arises due to the specific key being used and the action of unshifting items from the array. Once a key is utilized, the component will not re-render.

There are 2 possible solutions:

  1. Modify the key to include an event ID (recommended). You can create an ID using a Guid or a similar method.
  2. Clear the array and reconstruct it (inefficient in my opinion).

In my projects, I typically utilize a uuid package, but you could also try something like this:

event.id = '_' + Math.random().toString(36).substr(2, 9)

Then, in the component's v-for loop: :key="event.id"

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