n-back-top

name	n-back-top
description	Back Top component for scrolling back to page top. Invoke when user needs to implement a back-to-top button or scroll-to-top functionality in Naive UI.
metadata	{"author":"jiaiyan","version":"1.0.0"}

Naive UI Back Top Component

It helps you back to where you were. However, time never goes back.

When to Use

Use this component when:

• Long pages: Provide quick navigation back to top
• Infinite scroll: Allow users to return to top after scrolling deep
• Documentation sites: Easy navigation for long documentation pages
• E-commerce: Quick return to top after browsing products

When to Invoke

Invoke this skill when:

• User needs to implement a back-to-top button
• User wants to customize back-to-top appearance
• User needs to control visibility based on scroll height
• User wants to target a specific scrollable container
• User asks about scroll-to-top functionality

Features

• Auto Detection: Automatically finds first scrollable ancestor
• Visibility Control: Show/hide based on scroll height threshold
• Custom Position: Configurable right and bottom positioning
• Custom Content: Fully customizable button content
• Target Listening: Listen to specific scrollable elements

API Reference

BackTop Props

Name	Type	Default	Description
bottom	number | string	40	The height of BackTop from the bottom of the page
listen-to	string | HTMLElement	undefined	The element to be listened to scroll event. If it is undefined back top will listen to the nearest scrollable parent.
right	number | string	40	The width of BackTop from the right side of the page
show	boolean	undefined	Whether to show BackTop
to	string | HTMLElement	'body'	Container node to show BackTop
visibility-height	number	180	BackTop's trigger scroll top.
on-update:show	(value: boolean) => void	undefined	Callback is triggered when back-top display changes.

Basic Usage

Basic Back Top

<template>
  <n-back-top :right="100" />
</template>

Custom Visibility Height

<template>
  <n-back-top
    :bottom="100"
    :visibility-height="300"
    :style="{
      transition: 'all .3s cubic-bezier(.4, 0, .2, 1)',
    }"
  >
    <div
      style="
        width: 200px;
        height: 40px;
        line-height: 40px;
        text-align: center;
        font-size: 14px;
      "
    >
      Visibility Height: 300px
    </div>
  </n-back-top>
</template>

Custom Position

<template>
  <n-back-top
    :right="40"
    :bottom="160"
    :style="{
      transition: 'all .3s cubic-bezier(.4, 0, .2, 1)',
    }"
  >
    <div
      style="
        width: 200px;
        height: 40px;
        line-height: 40px;
        text-align: center;
        font-size: 14px;
      "
    >
      Change Position
    </div>
  </n-back-top>
</template>

Common Patterns

Target Specific Container

<template>
  <n-back-top
    :listen-to="target"
    :bottom="220"
    :visibility-height="10"
    :style="{
      transition: 'all .3s cubic-bezier(.4, 0, .2, 1)',
    }"
  >
    <div
      style="
        width: 200px;
        height: 40px;
        line-height: 40px;
        text-align: center;
        font-size: 14px;
      "
    >
      Specify Target
    </div>
  </n-back-top>
  <div
    ref="scrollContainer"
    style="overflow: auto; height: 72px; line-height: 1.5"
  >
    <p v-for="i in 10" :key="i">Scroll content line {{ i }}</p>
  </div>
</template>

<script setup>
import { ref, computed } from 'vue';

const scrollContainer = ref(null);
const target = computed(() => scrollContainer.value);
</script>

Custom Icon Back Top

<template>
  <n-back-top :right="40" :bottom="80">
    <n-button circle size="large">
      <template #icon>
        <n-icon><ArrowUpIcon /></n-icon>
      </template>
    </n-button>
  </n-back-top>
</template>

Controlled Visibility

<template>
  <n-back-top :show="isVisible" @update:show="handleShowChange" />
</template>

<script setup>
import { ref } from 'vue';

const isVisible = ref(false);

const handleShowChange = value => {
  isVisible.value = value;
};
</script>

Best Practices

1. Set appropriate visibility-height: Show button only after meaningful scroll distance

2. Position for accessibility: Position where it won't obstruct content but is easily accessible

3. Customize for branding: Match button style with your application theme

4. Use with specific containers: Set listen-to for scrollable containers other than document

5. Smooth transitions: Add CSS transitions for better user experience

6. Mobile considerations: Adjust position for mobile devices to avoid obstruction