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Ui Code Snippets

teknowize

teknowize

Zoom an Image on Mouse Hover Using HTML, CSS and javaScript

HTML

CSS

JS

Output

HTML

CSS

JS

function imageZoom(imgID, resultID) {
            var img, lens, result, cx, cy;
            img = document.getElementById(imgID);
            result = document.getElementById(resultID);
            lens = document.createElement("DIV");
            lens.setAttribute("class", "zoom-with-lense");
            img.parentElement.insertBefore(lens, img);
            cx = result.offsetWidth / lens.offsetWidth;
            cy = result.offsetHeight / lens.offsetHeight;
            result.style.backgroundImage = "url('" + img.src + "')";
            result.style.backgroundSize = (img.width * cx) + "px " + (img.height * cy) + "px";
            lens.addEventListener("mousemove", moveLens);
            img.addEventListener("mousemove", moveLens);
            lens.addEventListener("touchmove", moveLens);
            img.addEventListener("touchmove", moveLens);
            function moveLens(e) {
                var pos, x, y;
                e.preventDefault();
                pos = getCursorPos(e);
                x = pos.x - (lens.offsetWidth / 2);
                y = pos.y - (lens.offsetHeight / 2);
                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; }
                lens.style.left = x + "px";
                lens.style.top = y + "px";
                result.style.backgroundPosition = "-" + (x * cx) + "px -" + (y * cy) + "px";
            }
            function getCursorPos(e) {
                var a, x = 0, y = 0;
                e = e || window.event;
                a = img.getBoundingClientRect();
                x = e.pageX - a.left;
                y = e.pageY - a.top;
                x = x - window.pageXOffset;
                y = y - window.pageYOffset;
                return { x: x, y: y };
            }
        }

imageZoom("imageTagId", "ZoomResult");

Output