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zoom-lens-images.js
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function zoomLens(imageElement, resultElement) {
var image,
lens,
result,
coordinates_x,
coordinates_y;
image = document.querySelector(imageElement);
result = document.querySelector(resultElement);
lens = document.createElement("DIV");
lens.style.border = "1px solid #000";
lens.style.position = "absolute";
lens.style.width = "25px";
lens.style.height = "25px";
image.parentElement.insertBefore(lens, image);
coordinates_x = (result.offsetWidth / lens.offsetWidth) * 0.25;
coordinates_y = (result.offsetHeight / lens.offsetHeight) * 0.25;
result.style.backgroundImage = "url('" + image.src + "')";
result.style.backgroundSize = (image.width * coordinates_x) + "px " + (image.height * coordinates_y) + "px";
lens.addEventListener("mousemove", movingLens);
image.addEventListener("mousemove", movingLens);
lens.addEventListener("touchmove", movingLens);
image.addEventListener("touchmove", movingLens);
function movingLens(e) {
var pos,
x,
y;
e.preventDefault();
pos = getCursorPosition(e, image);
x = pos.x - (lens.offsetWidth / 2);
y = pos.y - (lens.offsetHeight / 2);
if (x > image.width - lens.offsetWidth) {
x = image.width - lens.offsetWidth;
}
if (x < 0) {
x = 0;
}
if (y > image.height - lens.offsetHeight) {
y = image.height - lens.offsetHeight;
}
if (y < 0) {
y = 0;
}
lens.style.left = x + "px";
lens.style.top = y + "px";
result.style.backgroundPosition = "-" + (x * coordinates_x) + "px -" + (y * coordinates_y) + "px";
}
}
function zoomMagnifyingGlasses(imageElement, zoomLevel) {
var image,
lens,
width,
height;
image = document.querySelector(imageElement);
lens = document.createElement("DIV");
lens.style.position = "absolute";
lens.style.border = "1px solid #000";
lens.style.borderRadius = "25px";
lens.style.cursor = "none";
lens.style.width = "50px";
lens.style.height = "50px";
image.parentElement.insertBefore(lens, image);
lens.style.backgroundImage = "url('" + image.src + "')";
lens.style.backgroundRepeat = "no-repeat";
lens.style.backgroundSize = (image.width * zoomLevel) + "px " + (image.height * zoomLevel) + "px";
width = lens.offsetWidth / 2;
height = lens.offsetHeight / 2;
lens.addEventListener("mousemove", movingMagnifier);
image.addEventListener("mousemove", movingMagnifier);
lens.addEventListener("touchmove", movingMagnifier);
image.addEventListener("touchmove", movingMagnifier);
function movingMagnifier(e) {
var pos,
x,
y;
e.preventDefault();
pos = getCursorPosition(e, image);
x = pos.x;
y = pos.y;
if (x > image.width - (width / zoomLevel)) {
x = image.width - (width / zoomLevel);
}
if (x < width / zoomLevel) {
x = width / zoomLevel;
}
if (y > image.height - (height / zoomLevel)) {
y = image.height - (height / zoomLevel);
}
if (y < height / zoomLevel) {
y = height / zoomLevel;
}
lens.style.left = (x - width) + "px";
lens.style.top = (y - height) + "px";
lens.style.backgroundPosition = "-" + ((x * zoomLevel) - width) + "px -" + ((y * zoomLevel) - height) + "px";
}
}
// Help functions
function getCursorPosition(e, imageElement) {
var image,
position_x = 0,
position_y = 0;
e = e || window.event;
image = imageElement.getBoundingClientRect();
position_x = e.pageX - image.left;
position_y = e.pageY - image.top;
position_x = position_x - window.pageXOffset;
position_y = position_y - window.pageYOffset;
return { x: position_x, y: position_y };
}