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實作 Icon Toggle

Sam Xiao's Avatar 2021-04-10

Icon Toggle 可簡單設定 true 與 false，但必須搭配 JavaScript 維護 State 並動態改變 Utility。

Version

Vue 3.0.5
Tailwind CSS 2.1.1

Icon Toggle

icon000

功能與 Simple Toggle 一樣，但帶有 SVG Icon。

<template>
  <button @click="onClick" type="button" :class="isOn ? 'bg-indigo-600' : 'bg-gray-200'" class="relative inline-flex flex-shrink-0 h-6 w-11 border-2 border-transparent rounded-full cursor-pointer transition-colors ease-in-out duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500" aria-pressed="false">
    <span class="sr-only">Use setting</span>
    <span :class="isOn ? 'translate-x-5' : 'translate-x-0'" class="pointer-events-none relative inline-block h-5 w-5 rounded-full bg-white shadow transform ring-0 transition ease-in-out duration-200">
      <span :class="isOn ? 'opacity-0 ease-out duration-100' : 'opacity-100 ease-in duration-200'" class="absolute inset-0 h-full w-full flex items-center justify-center transition-opacity" aria-hidden="true">
        <svg class="bg-white h-3 w-3 text-gray-400" fill="none" viewBox="0 0 12 12">
          <path d="M4 8l2-2m0 0l2-2M6 6L4 4m2 2l2 2" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
        </svg>
      </span>
      <span :class="isOn ? 'opacity-100 ease-in duration-200' : 'opacity-0 ease-out duration-100'" class="absolute inset-0 h-full w-full flex items-center justify-center transition-opacity" aria-hidden="true">
        <svg class="bg-white h-3 w-3 text-indigo-600" fill="currentColor" viewBox="0 0 12 12">
          <path d="M3.707 5.293a1 1 0 00-1.414 1.414l1.414-1.414zM5 8l-.707.707a1 1 0 001.414 0L5 8zm4.707-3.293a1 1 0 00-1.414-1.414l1.414 1.414zm-7.414 2l2 2 1.414-1.414-2-2-1.414 1.414zm3.414 2l4-4-1.414-1.414-4 4 1.414 1.414z"/>
        </svg>
      </span>
    </span>
  </button>
</template>

<script setup>
ref: isOn = true

let onClick = () => isOn = !isOn
</script>

第 2 行

<button @click="onClick" :class="isOn ? 'bg-indigo-600' : 'bg-gray-200'">

  • 外層 <button> 需攔截 click event 維護 state

  • 當 isOn 為 true 時使用 bg-indigo-600，否則使用 bg-gray-200

第 4 行

<span :class="isOn ? 'translate-x-5' : 'translate-x-0'">

當 isOn 為 true 時使用 translate-x-5，否則使用 translate-x-0。

第 5 行

<span :class="isOn ? 'opacity-0 ease-out duration-100' : 'opacity-100 ease-in duration-200'">

當 isOn 為 true 時顯示打叉 icon，否則隱藏 icon。

10 行

<span :class="isOn ? 'opacity-100 ease-in duration-200' : 'opacity-0 ease-out duration-100'">

當 isOn 為 true 時顯示打勾 icon，否則隱藏 icon。

20 行

ref: isOn = true

定義 isOn state 並設定初始值為 true。

22 行

let onClick = () => isOn = !isOn

onClick() 會對 isOn state 做 toggle。

Function Pipeline

<template>
  <button @click="onClick" type="button" :class="isOn ? 'bg-indigo-600' : 'bg-gray-200'" class="relative inline-flex flex-shrink-0 h-6 w-11 border-2 border-transparent rounded-full cursor-pointer transition-colors ease-in-out duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500" aria-pressed="false">
    <span class="sr-only">Use setting</span>
    <span :class="isOn ? 'translate-x-5' : 'translate-x-0'" class="pointer-events-none relative inline-block h-5 w-5 rounded-full bg-white shadow transform ring-0 transition ease-in-out duration-200">
      <span :class="isOn ? 'opacity-0 ease-out duration-100' : 'opacity-100 ease-in duration-200'" class="absolute inset-0 h-full w-full flex items-center justify-center transition-opacity" aria-hidden="true">
        <svg class="bg-white h-3 w-3 text-gray-400" fill="none" viewBox="0 0 12 12">
          <path d="M4 8l2-2m0 0l2-2M6 6L4 4m2 2l2 2" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
        </svg>
      </span>
      <span :class="isOn ? 'opacity-100 ease-in duration-200' : 'opacity-0 ease-out duration-100'" class="absolute inset-0 h-full w-full flex items-center justify-center transition-opacity" aria-hidden="true">
        <svg class="bg-white h-3 w-3 text-indigo-600" fill="currentColor" viewBox="0 0 12 12">
          <path d="M3.707 5.293a1 1 0 00-1.414 1.414l1.414-1.414zM5 8l-.707.707a1 1 0 001.414 0L5 8zm4.707-3.293a1 1 0 00-1.414-1.414l1.414 1.414zm-7.414 2l2 2 1.414-1.414-2-2-1.414 1.414zm3.414 2l4-4-1.414-1.414-4 4 1.414 1.414z"/>
        </svg>
      </span>
    </span>
  </button>
</template>

<script setup>
import { ref } from 'vue'
import { pipe, not } from 'ramda'
import { read, write } from 'vue3-fp'

let isOn = ref(true)

let onClick = pipe(
  read(isOn),
  not,
  write(isOn)
)
</script>

26 行

let onClick = pipe(
  read(isOn),
  not,
  write(isOn)
)
  • read(isOn)：讀取 isOn state
  • not()：對 isOn state 做 toggle
  • write(isOn)：寫入 isOn state

Conclusion

  • Icon Toggle 必須自行攔截 click event 並對 isOn state 做 toggle
  • Tailwind UI 常有兩個 utility 根據 state 改變而切換 utility，可簡單在 :class 內使用 ?: operator

# Vue # TailwindCSS