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jquery.zoom.js

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2026-04-15 05:42:42

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jquery.zoom.min.js

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2026-04-15 05:42:42

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📄jquery.zoom.js

/*!
	Zoom 1.7.21
	license: MIT
	http://www.jacklmoore.com/zoom
*/
(function ($) {
	var defaults = {
		url: false,
		callback: false,
		target: false,
		duration: 120,
		on: 'mouseover', // other options: grab, click, toggle
		touch: true, // enables a touch fallback
		onZoomIn: false,
		onZoomOut: false,
		magnify: 1
	};

// Core Zoom Logic, independent of event listeners.
	$.zoom = function(target, source, img, magnify) {
		var targetHeight,
			targetWidth,
			sourceHeight,
			sourceWidth,
			xRatio,
			yRatio,
			offset,
			$target = $(target),
			position = $target.css('position'),
			$source = $(source);

// The parent element needs positioning so that the zoomed element can be correctly positioned within.
		target.style.position = /(absolute|fixed)/.test(position) ? position : 'relative';
		target.style.overflow = 'hidden';
		img.style.width = img.style.height = '';

$(img)
			.addClass('zoomImg')
			.css({
				position: 'absolute',
				top: 0,
				left: 0,
				opacity: 0,
				width: img.width * magnify,
				height: img.height * magnify,
				border: 'none',
				maxWidth: 'none',
				maxHeight: 'none'
			})
			.appendTo(target);

return {
			init: function() {
				targetWidth = $target.outerWidth();
				targetHeight = $target.outerHeight();

if (source === target) {
					sourceWidth = targetWidth;
					sourceHeight = targetHeight;
				} else {
					sourceWidth = $source.outerWidth();
					sourceHeight = $source.outerHeight();
				}

xRatio = (img.width - targetWidth) / sourceWidth;
				yRatio = (img.height - targetHeight) / sourceHeight;

offset = $source.offset();
			},
			move: function (e) {
				var left = (e.pageX - offset.left),
					top = (e.pageY - offset.top);

top = Math.max(Math.min(top, sourceHeight), 0);
				left = Math.max(Math.min(left, sourceWidth), 0);

img.style.left = (left * -xRatio) + 'px';
				img.style.top = (top * -yRatio) + 'px';
			}
		};
	};

$.fn.zoom = function (options) {
		return this.each(function () {
			var
			settings = $.extend({}, defaults, options || {}),
			//target will display the zoomed image
			target = settings.target && $(settings.target)[0] || this,
			//source will provide zoom location info (thumbnail)
			source = this,
			$source = $(source),
			img = document.createElement('img'),
			$img = $(img),
			mousemove = 'mousemove.zoom',
			clicked = false,
			touched = false;

// If a url wasn't specified, look for an image element.
			if (!settings.url) {
				var srcElement = source.querySelector('img');
				if (srcElement) {
					settings.url = srcElement.getAttribute('data-src') || srcElement.currentSrc || srcElement.src;
					settings.alt = srcElement.getAttribute('data-alt') || srcElement.alt;
				}
				if (!settings.url) {
					return;
				}
			}

$source.one('zoom.destroy', function(position, overflow){
				$source.off(".zoom");
				target.style.position = position;
				target.style.overflow = overflow;
				img.onload = null;
				$img.remove();
			}.bind(this, target.style.position, target.style.overflow));

img.onload = function () {
				var zoom = $.zoom(target, source, img, settings.magnify);

function start(e) {
					zoom.init();
					zoom.move(e);

// Skip the fade-in for IE8 and lower since it chokes on fading-in
					// and changing position based on mousemovement at the same time.
					$img.stop()
					.fadeTo($.support.opacity ? settings.duration : 0, 1, 'function' === typeof settings.onZoomIn ? settings.onZoomIn.call(img) : false);
				}

function stop() {
					$img.stop()
					.fadeTo(settings.duration, 0, 'function' === typeof settings.onZoomOut ? settings.onZoomOut.call(img) : false);
				}

// Mouse events
				if (settings.on === 'grab') {
					$source
						.on('mousedown.zoom',
							function (e) {
								if (e.which === 1) {
									$(document).one('mouseup.zoom',
										function () {
											stop();

$(document).off(mousemove, zoom.move);
										}
									);

start(e);

$(document).on(mousemove, zoom.move);

e.preventDefault();
								}
							}
						);
				} else if (settings.on === 'click') {
					$source.on('click.zoom',
						function (e) {
							if (clicked) {
								// bubble the event up to the document to trigger the unbind.
								return;
							} else {
								clicked = true;
								start(e);
								$(document).on(mousemove, zoom.move);
								$(document).one('click.zoom',
									function () {
										stop();
										clicked = false;
										$(document).off(mousemove, zoom.move);
									}
								);
								return false;
							}
						}
					);
				} else if (settings.on === 'toggle') {
					$source.on('click.zoom',
						function (e) {
							if (clicked) {
								stop();
							} else {
								start(e);
							}
							clicked = !clicked;
						}
					);
				} else if (settings.on === 'mouseover') {
					zoom.init(); // Preemptively call init because IE7 will fire the mousemove handler before the hover handler.

$source
						.on('mouseenter.zoom', start)
						.on('mouseleave.zoom', stop)
						.on(mousemove, zoom.move);
				}

// Touch fallback
				if (settings.touch) {
					$source
						.on('touchstart.zoom', function (e) {
							e.preventDefault();
							if (touched) {
								touched = false;
								stop();
							} else {
								touched = true;
								start( e.originalEvent.touches[0] || e.originalEvent.changedTouches[0] );
							}
						})
						.on('touchmove.zoom', function (e) {
							e.preventDefault();
							zoom.move( e.originalEvent.touches[0] || e.originalEvent.changedTouches[0] );
						})
						.on('touchend.zoom', function (e) {
							e.preventDefault();
							if (touched) {
								touched = false;
								stop();
							}
						});
				}

if ('function' === typeof settings.callback) {
					settings.callback.call(img);
				}
			};

img.setAttribute('role', 'presentation');
			img.alt = settings.alt || '';
			img.src = settings.url;
		});
	};

$.fn.zoom.defaults = defaults;
}(window.jQuery));