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Why Vue’s DOM can still show the old value
When reactive state changes, Vue buffers the resulting component updates and applies them in the next update flush rather than synchronously after each mutation. This batching lets Vue combine changes and avoid rendering repeatedly for every individual assignment. As a result, code that reads an element immediately after changing a ref or component property may observe the DOM from before that change.
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Vue describes nextTick() as a utility for waiting for the next DOM update flush. Awaiting it after the relevant mutation lets dependent code run after Vue has applied that update. Vue 3 Global API: General
Use nextTick() after the state change
Composition API in Vue 3
Import nextTick as a named export from vue. In an asynchronous function, await it immediately after the mutation whose DOM result you need:
#1 Best Overall
import { ref, nextTick } from 'vue'
const message = ref('before')
async function updateMessage() {
message.value = 'after'
await nextTick()
// Vue has applied the DOM update for this change.
// Read or act on the updated element here.
}The Promise resolves when Vue’s next DOM update flush has completed. You can also pass a callback to nextTick(); awaiting the Promise is often simpler when the surrounding function is already async. Vue 3 Global API: General
Options API in Vue 3
The same named import works in an Options API component. Call it after assigning the component property:
import { nextTick } from 'vue'
export default {
data() {
return { message: 'before' }
},
methods: {
async updateMessage() {
this.message = 'after'
await nextTick()
// The DOM now reflects this update.
}
}
}Options API components also provide this.$nextTick(). When you use its callback form, the callback’s this is bound to the component instance. Vue 3 Global API: General
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| Option | When it runs | Best fit |
|---|---|---|
nextTick() |
After the next Vue DOM update flush following the point where it is called. | DOM work tied to one specific state change. |
updated lifecycle hook |
After component DOM updates generally. | Work that belongs after component updates broadly, rather than after one specific mutation. |
Vue’s lifecycle guidance recommends nextTick() when you need the updated DOM after a particular state change. Avoid changing component state inside updated: Vue warns that doing so can trigger an infinite update loop. Vue 3 Options: Lifecycle
Vue 2 and Vue 3 use different global syntax
For current Vue 3 code, import the named function with import { nextTick } from 'vue'. Vue 2 examples commonly use Vue.nextTick(callback) or this.$nextTick(callback), and its API documentation advises calling it immediately after changing data when waiting for the DOM update. Treat those global examples as Vue 2 syntax, not as the Vue 3 import pattern. Vue 3 Global API: General · Vue 2 API
What nextTick() does not wait for
nextTick() waits for Vue’s DOM update flush; it is not a promise that every part of the browser’s rendering or other asynchronous work is finished. The Vue API documentation does not establish that it waits for images to load, CSS transitions to complete, a browser frame to paint, or unrelated asynchronous operations. If your code depends on one of those events, wait for that event separately. Vue 3 Global API: General
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