How TO – Image Zoom

Learn how to create an image zoom.

Image Zoom

Mouse over the image:

The image must be placed inside a container with relative positioning.

The result can be put anywhere on the page, but must have the class name “img-zoom-result”.

Make sure both the image and the result have IDs. These IDs are used when a javaScript initiates the zoom effect.

Example

<!DOCTYPE html>
<html>
<head>
<meta name=”viewport” content=”width=device-width, initial-scale=1.0″>
<style>
* {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;
}
</style>
<script>
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;
e = e || window.event;
/*get the x and y positions of the image:*/
a = img.getBoundingClientRect();
/*calculate the cursor’s x and y coordinates, relative to the image:*/
x = e.pageX – a.left;
y = e.pageY – a.top;
/*consider any page scrolling:*/
x = x – window.pageXOffset;
y = y – window.pageYOffset;
return {x : x, y : y};
}
}
</script>
</head>
<body>

<h1>Image Zoom</h1>

<p>Mouse over the image:</p>

<p>The image must be placed inside a container with relative positioning.</p>
<p>The result can be put anywhere on the page, but must have the class name “img-zoom-result”.</p>
<p>Make sure both the image and the result have IDs. These IDs are used when a javaScript initiates the zoom effect.</p>

</body>
</html>

Create an Image Zoom

Step 1) Add HTML:

Example

Step 2) Add CSS:

The container must have a “relative” positioning.

Example

* {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;
}

Step 3) Add JavaScript:

Example

Step 4) Initiate the Zoom Effect:

Example

<!DOCTYPE html>
<html>
<head>
<meta name=”viewport” content=”width=device-width, initial-scale=1.0″>
<style>
* {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;
}

<h1>Image Zoom</h1>

<p>Mouse over the image:</p>

</body>
</html>

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