untung99play.xyz: Create an Image Zoom
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Learn how to create an image zoom.
Mouse over the image:
Zoom Preview:
Try it Yourself »
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
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)> if (y > img.height –
lens.offsetHeight) {y = img.height – lens.offsetHeight;}
if (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)