Touch Target Navigation JavaScript Prototype

[] Check out https : //m3.material.io for how they are preventing the safari bottom nav from hiding so you get a constent experience

All Systems Red

Martha Wells

#exampleWrapper {
   display: grid;
   place-items: center;
}

#outputArea {
  display: grid;
  background-color: blue;
  width: 250px;
  height: 100px;
  margin-bottom: 2rem;
  grid-template-columns: 90px 1fr;
}

#outputArea img {
  max-height: 100px;
}

#inputArea {
  display: grid;
  width: 250px;
  grid-template-columns: 50px 50px 50px 50px 50px;
  margin-bottom: 3rem;
}

#inputArea img {
  width: 50px;
  height: 50px;
}

JavaScript

const s = [0, 0]

const books = [
  [
    { 
      title: "All Systems Red", 
      author: "Martha Wells",
      img: "all-systems-red-cover-1" },
    { 
      title: "Fool", 
      author: "Christopher Moore",
      img: "fool-cover-1" 
    },
  ],
  [
    { 
      title: "The Design Of Everyday Things", 
      author: "Don Norman",
      img: "design-of-every-day-things-cover-1" 
    },
    { 
      title: "Hawkeye", 
      author: "Matt Fraction",
      img: "hawkeye-cover-1" 
    },
  ],
  [
    { 
      title: "The Diamond Age", 
      author: "Neal Stephenson",
      img: "diamond-age-cover-1" 
    },
    { 
      title: "Neoromancer", 
      author: "William Gibson",
      img: "neuromancer-cover-1" 
    },
  ],
  [
    { 
      title: "The Trial", 
      author: "Franz Kafka",
      img: "the-trial-cover-1" 
    },
    { 
      title: "A Scanner Darkly", 
      author: "Philip K. Dick",
      img: "scanner-darkly-cover-1" 
    },
  ],
  [
    { 
      title: "Dune", 
      author: "Frank Herbert",
      img: "dune-cover-1" 
    },
    { 
      title: "The Gunslinger", 
      author: "Stephen King",
      img: "the-gunslinger-cover-1" 
    },
  ]
]



const changeBook = (event) => {
  event.preventDefault()
  const x = Math.floor(parseInt(
    event.changedTouches[0].clientX - 
    inputArea.getBoundingClientRect().left,
    10) / 50)
  const y = Math.floor(parseInt(
    event.changedTouches[0].clientY - 
    inputArea.getBoundingClientRect().top, 
    10) / 50)
  if (s[0] != x || s[1] != y) {
    s[0] = x
    s[1] = y
    bookImage.src = `/images/js-touch-prototype/${books[x][y].img}.jpg`
    bookTitle.innerHTML = books[x][y].title 
    bookAuthor.innerHTML = books[x][y].author
    console.log(x)
    console.log(y)
  }
}

const handleMove = (event) => {
  changeBook(event)
}

const handleStart = (event) => {
  changeBook(event)
}

const init = () => {
  console.log("init")
  inputArea.addEventListener("touchstart", handleStart)
  inputArea.addEventListener("touchmove", handleMove)
}

document.addEventListener("DOMContentLoaded", init)