Random Choice Picker

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>Random Choice Picker</title>
  </head>
  <body>
    <div class="container">
      <h3>Enter all of the choices divided by a comma (','). <br> Press enter when you're done</h3>
      <textarea placeholder="Enter choices here..." id="textarea"></textarea>

      <div id="tags"></div>
    </div>

    <script src="script.js"></script>
  </body>
</html>

@import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

* {
    
    
  box-sizing: border-box;
}

body {
    
    
  background-color: #2b88f0;
  font-family: 'Muli', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

h3 {
    
    
  color: #fff;
  margin: 10px 0 20px;
  text-align: center;
}

.container {
    
    
  width: 500px;
}

textarea {
    
    
  border: none;
  display: block;
  width: 100%;
  height: 100px;
  font-family: inherit;
  padding: 10px;
  margin: 0 0 20px;
  font-size: 16px;
}

textarea:focus {
    
    
  outline: none;
}

.tag {
    
    
  background-color: #f0932b;
  color: #fff;
  border-radius: 50px;
  padding: 10px 20px;
  margin: 0 5px 10px 0;
  font-size: 14px;
  display: inline-block;
}

.tag.highlight {
    
    
  background-color: #273c75;
}

const tagsEl = document.getElementById('tags')
const textarea = document.getElementById('textarea')

textarea.focus()

// keyup 事件在按键被松开时触发
textarea.addEventListener('keyup', (e) => {
    
    
    createTags(e.target.value)

    if(e.key === 'Enter') {
    
    
        // 该定时器在定时器到期后执行一个函数或指定的一段代码，消除textarea中的内容
        setTimeout(() => {
    
    
            e.target.value = ''
        }, 10)

        randomSelect()
    }
})

function createTags(input) {
    
    
    // trim() 方法会从一个字符串的两端删除空白字符
    // map() 方法创建一个新数组，这个新数组由原数组中的每个元素都调用一次提供的函数后的返回值组成
    const tags = input.split(',').filter(tag => tag.trim() !== '').map(tag => tag.trim())
    
    tagsEl.innerHTML = ''

    tags.forEach(tag => {
    
    
        const tagEl = document.createElement('span')
        tagEl.classList.add('tag')
        tagEl.innerText = tag
        tagsEl.appendChild(tagEl)
    })
}

function randomSelect() {
    
    
    const times = 30

    const interval = setInterval(() => {
    
    
        const randomTag = pickRandomTag()
	
	if (randomTag !== undefined) {
    
    
        highlightTag(randomTag)

        setTimeout(() => {
    
    
            unHighlightTag(randomTag)
        }, 100)
	}
    }, 100);

    // 高亮times次后消除定时器
    setTimeout(() => {
    
    
        clearInterval(interval)

        setTimeout(() => {
    
    
            const randomTag = pickRandomTag()

            highlightTag(randomTag)
        }, 100)

    }, times * 100)
}

function pickRandomTag() {
    
    
    const tags = document.querySelectorAll('.tag')
    return tags[Math.floor(Math.random() * tags.length)]
}

function highlightTag(tag) {
    
    
    tag.classList.add('highlight')
}

function unHighlightTag(tag) {
    
    
    tag.classList.remove('highlight')
}

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