<!DOCTYPE html>
<!--Codingthai.com--> 
<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()

textarea.addEventListener('keyup', (e) => {
    createTags(e.target.value)

    if(e.key === 'Enter') {
        setTimeout(() => {
            e.target.value = ''
        }, 10)

        randomSelect()
    }
})

function createTags(input) {
    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);

    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')
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.