One of the first things you learn with Vue is that changing reactive state automatically updates the DOM.
Vue batches DOM updates and applies them asynchronously. This is an important optimization because multiple state changes can be processed together instead of triggering a separate DOM update for every mutation.
But sometimes you need to change some state and then immediately work with the resulting DOM.
What nextTick() is Why Vue doesn't update the DOM synchronously How to use nextTick() Real-world examples When nextTick() is useful Common mistakes and best practices
nextTick() is a Vue utility that lets you wait until Vue has finished flushing pending DOM updates.
Vue's documentation describes nextTick() as a utility for waiting for the next DOM update flush.
The difference becomes important when you want to access the DOM immediately after changing reactive state.
Because Vue has updated the reactive state, but the DOM update hasn't been flushed yet.
One of the most useful real-world examples is dynamically rendering an element and then interacting with it.
At this point, the may not exist in the DOM yet because Vue hasn't processed the v-if update.
It's important not to start adding nextTick() after every reactive state change.
The reason to use nextTick() is when you specifically need to interact with the updated DOM.
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Vue's nextTick() is a small utility, but it solves an important problem: knowing when the DOM has caught up with your reactive state.