Image Switcher - Using Label Button

by Petr Haluza

HTML

<div>
	<img src="http://www.google.com/images/icons/product/chrome-32.png" title="image 1" alt="image 1" id="image1" class="image-toggle" />
	<img src="http://www.google.com/images/icons/product/search-32.png" title="image 2" alt="image 2" id="image2" class="image-toggle" style="display:none;" />
</div>
<div class="btn-group" data-toggle="buttons">
  <label class="btn btn-primary image-toggler" data-image-id="#image1">
      <input type="radio" name="options" id="option1" /> Show Image 1
  </label>
  <label class="btn btn-primary image-toggler" data-image-id="#image2">
      <input type="radio" name="options" id="option2" /> Show Image 2
  </label>
</div>


<div class="img-zoom-container">
  <img id="myimage" src="https://cdn.alza.cz/Foto/f8/NB/NB118b5k.jpg" width="300" height="200">
  <div id="myresult" class="img-zoom-result"></div>
</div>

CSS

@import url('//netdna.bootstrapcdn.com/bootstrap/3.0.0-rc1/css/bootstrap.min.css');

.container {
    margin-top: 10px;
}

* {box-sizing: border-box;}
.img-zoom-container {
  position: relative;
}
.img-zoom-lens {
  position: absolute;
  border: 1px solid #d4d4d4;
  /*set the size of the lens:*/
  width: 40px;
  height: 40px;
}
.img-zoom-result {
  border: 1px solid #d4d4d4;
  /*set the size of the result div:*/
  width: 300px;
  height: 300px;
}

JavaScript

$('.image-toggler').click(function(){
		$('.image-toggle').hide();
		$($(this).attr('data-image-id')).show();
	});
  
  function imageZoom(imgID, resultID) {
  var img, lens, result, cx, cy;
  img = document.getElementById(imgID);
  result = document.getElementById(resultID);
  /*create lens:*/
  lens = document.createElement("DIV");
  lens.setAttribute("class", "img-zoom-lens");
  /*insert lens:*/
  img.parentElement.insertBefore(lens, img);
  /*calculate the ratio between result DIV and lens:*/
  cx = result.offsetWidth / lens.offsetWidth;
  cy = result.offsetHeight / lens.offsetHeight;
  /*set background properties for the result DIV:*/
  result.style.backgroundImage = "url('" + img.src + "')";
  result.style.backgroundSize = (img.width * cx) + "px " + (img.height * cy) + "px";
  /*execute a function when someone moves the cursor over the image, or the lens:*/
  lens.addEventListener("mousemove", moveLens);
  img.addEventListener("mousemove", moveLens);
  /*and also for touch screens:*/
  lens.addEventListener("touchmove", moveLens);
  img.addEventListener("touchmove", moveLens);
  function moveLens(e) {
    var pos, x, y;
    /*prevent any other actions that may occur when moving over the image:*/
    e.preventDefault();
    /*get the cursor's x and y positions:*/
    pos = getCursorPos(e);
    /*calculate the position of the lens:*/
    x = pos.x - (lens.offsetWidth / 2);
    y = pos.y - (lens.offsetHeight / 2);
    /*prevent the lens from being positioned outside the image:*/
    if (x > img.width - lens.offsetWidth) {x = img.width - lens.offsetWidth;}
    if (x < 0) {x = 0;}
    if (y > img.height - lens.offsetHeight) {y = img.height - lens.offsetHeight;}
    if (y < 0) {y = 0;}
    /*set the position of the lens:*/
    lens.style.left = x + "px";
    lens.style.top = y + "px";
    /*display what the lens "sees":*/
    result.style.backgroundPosition = "-" + (x * cx) + "px -" + (y * cy) + "px";
  }
  function getCursorPos(e) {
    var a, x = 0, y = 0;
   ...