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Product Image Zoom 본문

Javascript

Product Image Zoom

HiroDaegu 2022. 12. 28. 00:27
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실제 실행 화면

 

<html lang="en">

<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Product Image Zoom</title>
    <!-- Stylesheet -->
    <link rel="stylesheet" href="style.css" />
    <!-- Script -->
    <script defer src="main.js"></script>
</head>

<body>
    <div class="image-container" id="image-container">
        <img src="https://i.postimg.cc/Y0hq1pvS/shoe-img.jpg" id="product-image" alt="shoe" />
    </div>
    <div id="mouse-overlay"></div>
    <div id="overlay"></div>

</body>

</html>
* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
  }
  .image-container {
    width: 30%;
    margin: 5% 0 0 5%;
  }
  img {
    max-width: 100%;
  }
  #overlay {
    display: none;
    background: url("https://i.postimg.cc/Y0hq1pvS/shoe-img.jpg");
    position: absolute;
    width: 25%;
    height: 35%;
    margin-top: -30%;
    margin-left: 50%;
    border: 2px solid #555;
    z-index: 1000;
    background-repeat: no-repeat;
  }
  #mouse-overlay {
    cursor: zoom-in;
    position: absolute;
    width: 2em;
    height: 2em;
    transform: translate(-50%, -50%);
    background-color: rgba(245, 245, 245, 0.6);
    border-radius: 50%;
  }
  @media only screen and (max-width: 768px) {
    .image-container {
      width: 55%;
    }
    #overlay {
      margin-left: 70%;
      width: 25%;
      height: 15%;
    }
  }
//Initial References
let imageContainer = document.getElementById("image-container");
let productImage = document.getElementById("product-image");
let overlay = document.getElementById("overlay");
let mouseOverlay = document.getElementById("mouse-overlay");

//events object(stores events for touch,mouse)
let events = {
  mouse: {
    move: "mousemove",
  },
  touch: {
    move: "touchmove",
  },
};

//initially blank
let deviceType = "";

//Checks for device type
function isTouchDevice() {
  try {
    //We try to create touch event (it would fail for desktops and throw error)
    deviceType = "touch";
    document.createEvent("TouchEvent");
    return true;
  } catch (e) {
    deviceType = "mouse";
    return false;
  }
}

//hides overlay
const hideElement = () => {
  overlay.style.display = "none";
  mouseOverlay.style.display = "none";
};

//Check device so that deviceType variable is set to touch or mouse
isTouchDevice();

/*In addEventListener we use the events object to set the event so deviceType would be set to touch or mouse since we called 'isTouchDevice()' above
E.g:
if deviceType = "mouse" => the statement for event would be events[mouse].move which equals to mousemove.
if deviceType = "touch" => the statement for event would be events[touch].move which equals to touchstart.
*/

imageContainer.addEventListener(events[deviceType].move, (e) => {
  //Try, catch to avoid any errors for touch screens
  try {
    //pageX and pageY return the position of client's cursor from top left pf screen
    var x = !isTouchDevice() ? e.pageX : e.touches[0].pageX;
    var y = !isTouchDevice() ? e.pageY : e.touches[0].pageY;
  } catch (e) {}
  //get image height and width
  let imageWidth = imageContainer.offsetWidth;
  let imageHeight = imageContainer.offsetHeight;

  //check if mouse goes out of image container
  if (
    imageWidth - (x - imageContainer.offsetLeft) < 15 ||
    x - imageContainer.offsetLeft < 15 ||
    imageHeight - (y - imageContainer.offsetTop) < 15 ||
    y - imageContainer.offsetTop < 15
  ) {
    hideElement();
  } else {
    overlay.style.display = "block";
    mouseOverlay.style.display = "inline-block";
  }

  var posX = ((x - imageContainer.offsetLeft) / imageWidth).toFixed(4) * 100;
  var posY = ((y - imageContainer.offsetTop) / imageHeight).toFixed(4) * 100;

  //set background position to above obtained values
  overlay.style.backgroundPosition = posX + "%" + posY + "%";

  //move the overlay with cursor
  mouseOverlay.style.top = y + "px";
  mouseOverlay.style.left = x + "px";
});
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