Hover Card

An hover card allows sighted users to preview content available behind a link

Properties

openDelay

closeDelay

Features

Customize side, alignment, offsets
Optionally render a pointing arrow.
Supports custom open and close delays.
Opens on hover only.
Ignored by screen readers.

Installation

To use the hover card machine in your project, run the following command in your command line:

npm install @zag-js/hover-card @zag-js/react
# or
yarn add @zag-js/hover-card @zag-js/react

npm install @zag-js/hover-card @zag-js/vue
# or
yarn add @zag-js/hover-card @zag-js/vue

npm install @zag-js/hover-card @zag-js/vue
# or
yarn add @zag-js/hover-card @zag-js/vue

npm install @zag-js/hover-card @zag-js/solid
# or
yarn add @zag-js/hover-card @zag-js/solid

This command will install the framework agnostic hover card logic and the reactive utilities for your framework of choice.

Anatomy

To set up the hover card correctly, you'll need to understand its anatomy and how we name its parts.

Each part includes a data-part attribute to help identify them in the DOM.

On a high level, the hover card consists of:

Trigger: The trigger for the Hover Card - Usually a link.
Positioner: The element that positions the hover card.
Content: The container for the hover card's content.

Usage

First, import the hover card package into your project

import * as hoverCard from "@zag-js/hover-card"

The hover card package exports two key functions:

machine — The state machine logic for the hover card widget.
connect — The function that translates the machine's state to JSX attributes and event handlers.

Next, import the required hooks and functions for your framework and use the hover-card machine in your project 🔥

import * as hoverCard from "@zag-js/hover-card"
import { useMachine, normalizeProps, Portal } from "@zag-js/react"

function HoverCard() {
  const [state, send] = useMachine(hoverCard.machine({ id: "1" }))

  const api = hoverCard.connect(state, send, normalizeProps)

  return (
    <>
      <a
        href="https://twitter.com/zag_js"
        target="_blank"
        {...api.triggerProps}
      >
        Twitter
      </a>

      {api.isOpen && (
        <Portal>
          <div {...api.positionerProps}>
            <div {...api.contentProps}>
              <div {...api.arrowProps}>
                <div {...api.arrowTipProps} />
              </div>
              Twitter Preview
            </div>
          </div>
        </Portal>
      )}
    </>
  )
}

import * as hoverCard from "@zag-js/hover-card"
import { normalizeProps, useMachine } from "@zag-js/vue"
import { defineComponent, h, Fragment, computed, Teleport } from "vue"

export default defineComponent({
  name: "HoverCard",
  setup() {
    const [state, send] = useMachine(hoverCard.machine({ id: "hoverCard" }))

    const apiRef = computed(() =>
      hoverCard.connect(state.value, send, normalizeProps),
    )

    return () => {
      const api = apiRef.value
      return (
        <>
          <a
            href="https://twitter.com/zag_js"
            target="_blank"
            {...api.triggerProps}
          >
            Twitter
          </a>

          {api.isOpen && (
            <Teleport to="body">
              <div {...api.positionerProps}>
                <div {...api.contentProps}>
                  <div {...api.arrowProps}>
                    <div {...api.arrowTipProps} />
                  </div>
                  Twitter Preview
                </div>
              </div>
            </Teleport>
          )}
        </>
      )
    }
  },
})

<script setup>
import * as hoverCard from "@zag-js/hover-card"
import { normalizeProps, useMachine } from "@zag-js/vue"
import { computed, Teleport } from "vue"

const [state, send] = useMachine(hoverCard.machine({ id: "1" }))

const api = computed(() => hoverCard.connect(state.value, send, normalizeProps))
</script>

<template>
  <a 
    href="https://twitter.com/zag_js"
    target="_blank" 
    v-bind="api.triggerProps"
  >
    Twitter
  </a>
  <Teleport to="body" v-if="api.isOpen">
    <div v-bind="api.positionerProps">
      <div v-bind="api.contentProps">
        <div v-bind="api.arrowProps">
          <div v-bind="api.arrowTipProps" />
        </div>
        Twitter Preview
      </div>
    </div>
  </Teleport>
</template>

import * as hoverCard from "@zag-js/hover-card"
import { normalizeProps, useMachine } from "@zag-js/solid"
import { createMemo, createUniqueId, Show } from "solid-js"
import { Portal } from "solid-js/web"

function Checkbox() {
  const [state, send] = useMachine(hoverCard.machine({ id: "1" }))

  const api = hoverCard.connect(state, send, normalizeProps)

  return (
    <>
      <a
        href="https://twitter.com/zag_js"
        target="_blank"
        {...api().triggerProps}
      >
        Twitter
      </a>

      <Show when={api().isOpen}>
        <Portal>
          <div {...api().positionerProps}>
            <div {...api().contentProps}>
              <div {...api().arrowProps}>
                <div {...api().arrowTipProps} />
              </div>
              Twitter Preview
            </div>
          </div>
        </Portal>
      </Show>
    </>
  )
}

Making it opened initially

To make an hover card open by default, set the context's open property to true

const [state, send] = useMachine(
  hoverCard.machine({
    open: true,
  }),
)

Listening for changes in `open` state

When the hover card is opened or closed, the onOpenChange callback is invoked.

const [state, send] = useMachine(
  hoverCard.machine({
    onOpenChange(open) {
      console.log("hovercard is:", open ? "opened" : "closed")
      // open -  true | false
    },
  }),
)

Styling guide

Earlier, we mentioned that each hover card part has a data-part attribute added to them to select and style them in the DOM.

[data-part="trigger"] {
  /* styles for trigger */
}

[data-part="content"] {
  /* styles for content */
}

Open and closed state

The hover card exposes a data-state attribute that can be used to style the hover card based on its open-close state.

[data-part="trigger"][data-state="open|closed"] {
  /* styles for open or closed state */
}

[data-part="content"][data-state="open|closed"] {
  /* styles for open or closed state */
}

Arrow

Zag exposes some variable that can be used to style the arrow.

[data-part="arrow"] {
  /* styles for arrow */
  --arrow-background: white;
  --arrow-size: 8px;
}

[data-part="content"] {
  /* styles for content */
}

Methods and Properties

The hover card's api method exposes the following methods:

isOpenbooleanWhether the hover card is open

open() => voidFunction to open the hover card

close() => voidFunction to close the hover card

setPositioning(options?: Partial<PositioningOptions>) => voidFunction to reposition the popover

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