@floating-ui/vue 2.0.1

Vue 3 composable for anchor positioning. useFloating() computes x/y coordinates that place a floating element (tooltip, popover, menu) next to a reference element.

Version limits

Vue >=3.3.0 only (peer dependency, package.json:58). v2.0.0 dropped the vue-demi layer, ending Vue 2 and Vue <3.3 support.
Vue 2 or Vue <3.3 projects must stay on npm install @floating-ui/vue@1 (https://floating-ui.com/docs/vue).
Runtime dependencies: @floating-ui/dom@^1.8.0, @floating-ui/utils@^0.2.12 (package.json:46-49).
TypeScript with exactOptionalPropertyTypes: supported since v2.0.1 (optional properties are typed T | undefined, dist/floating-ui.vue.d.ts:198-224).

Quick start

<script setup>
import {ref} from 'vue';
import {useFloating, offset, flip, shift, autoUpdate} from '@floating-ui/vue';

const reference = ref(null);
const floating = ref(null);
const open = ref(false);

const {floatingStyles, isPositioned} = useFloating(reference, floating, {
  open,
  middleware: [offset(10), flip(), shift()],
  whileElementsMounted: autoUpdate,
});
</script>

<template>
  <button ref="reference" @click="open = !open">Button</button>
  <div v-if="open" ref="floating" :style="floatingStyles">Tooltip</div>
</template>

Default placement is bottom; positioning uses transform by default (https://floating-ui.com/docs/vue).

API changes since 1.x

BREAKING (2.0.0): vue-demi removed. Vue 2 and Vue <3.3 no longer supported. No other breaking API changes; useFloating, arrow, and all re-exports keep their 1.1.x signatures (https://github.com/floating-ui/floating-ui/releases/tag/@floating-ui/vue@2.0.0).
FIX (2.0.1): optional useFloating options accept explicit undefined under exactOptionalPropertyTypes (https://github.com/floating-ui/floating-ui/releases/tag/@floating-ui/vue@2.0.1).
Unchanged behaviors carried from 1.x: x/y default to 0 (not null); floatingStyles returns ready-to-bind positioning styles; options accept refs and getters (MaybeReadonlyRefOrGetter) since 1.1.0 (verified in dist/floating-ui.vue.d.ts:193-225, dist/floating-ui.vue.mjs:83-84).

Best practices

Pass whileElementsMounted: autoUpdate so the floating element stays anchored during scroll, resize, and layout changes (dist/floating-ui.vue.mjs:146-156; https://floating-ui.com/docs/vue).
When wrapping autoUpdate to pass options, always return the cleanup function (dist/floating-ui.vue.mjs:140-145):

useFloating(reference, floating, {
  whileElementsMounted(...args) {
    return autoUpdate(...args, {animationFrame: true});
  },
});

Use v-if for the floating element when using whileElementsMounted. With v-show, skip whileElementsMounted and manage autoUpdate manually, or listeners leak on hidden elements (https://floating-ui.com/docs/vue).
Pass an open ref and gate side effects on isPositioned; positioning resolves in a microtask, so the element sits at (0, 0) until then. isPositioned stays false while open is false (dist/floating-ui.vue.mjs:137, dist/floating-ui.vue.mjs:157-161):

const {isPositioned} = useFloating(reference, floating, {open});
watch(isPositioned, (positioned) => {
  if (positioned) inputRef.value?.focus();
});

Pass refs or getters (() => props.placement) to open, placement, strategy, middleware, transform options for reactivity; they are watched with flush: 'sync' (dist/floating-ui.vue.mjs:162-164).
Pass component template refs directly. Components are unwrapped via $el; a component that renders a comment node resolves to null and positioning safely no-ops (dist/floating-ui.vue.mjs:6-15).
Keep the default transform: true and animate an inner wrapper element if you need CSS transform animations; the outer positioned node keeps translate() positioning (https://floating-ui.com/docs/vue).
Use arrow({element: arrowRef}) with a template ref. It no-ops (returns {}) until the arrow element mounts; read middlewareData.arrow?.x/.y for placement (dist/floating-ui.vue.mjs:27-34).

Common tasks

Arrow positioning example and full option defaults: API reference.
Upgrading from 1.x or pinning for Vue 2: Migration guide.

Package exports

useFloating, arrow, plus re-exports from @floating-ui/dom: autoPlacement, autoUpdate, computePosition, detectOverflow, flip, getOverflowAncestors, hide, inline, limitShift, offset, platform, shift, size (dist/floating-ui.vue.mjs:2). Import middleware from @floating-ui/vue, not @floating-ui/dom, to keep the Vue-aware arrow behavior.

floating-ui-vue-skilld