哪位懂jquery PhotoSwipe 的大神帮帮忙

java开发工程师 发布于 2016/05/05 19:52
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用PhotoSwipe进行图片缩放       点击图片显示原始比例图片     触摸屏是才放大(类似百度地图效果)    


我想问  点击图片怎样控制显示原始比例图片(怎样设置图片自适应高度 )



下面是我实现的js代码

(function() {
/* var he=$("#wimg").height();
    var wi=$("#wimg").width();*/
var initPhotoSwipeFromDOM = function(gallerySelector) {


var parseThumbnailElements = function(el) {
var thumbElements = el.childNodes, numNodes = thumbElements.length, items = [], el, childElements, thumbnailEl, size, item;


for ( var i = 0; i < numNodes; i++) {
el = thumbElements[i];


// include only element nodes
if (el.nodeType !== 1) {
continue;
}


childElements = el.children;


size = el.getAttribute('data-size').split('x');


// create slide object
item = {
src : el.getAttribute('href'),
w : parseInt(size[0], 10),
h : parseInt(size[1], 10),
author : el.getAttribute('data-author')
};


item.el = el; // save link to element for getThumbBoundsFn


if (childElements.length > 0) {
item.msrc = childElements[0].getAttribute('src'); // thumbnail
// url
if (childElements.length > 1) {
item.title = childElements[1].innerHTML; // caption
// (contents
// of
// figure)
}
}
var mediumSrc = el.getAttribute('data-med');
if (mediumSrc) {
size = el.getAttribute('data-med-size').split('x');
console.log(size[1]);
// "medium-sized" image
item.m = {
src : mediumSrc,
w : parseInt(size[0], 10),
h : parseInt(size[1], 10)
};
}
// original image
item.o = {
src : item.src,
w : item.w,
h : item.h
};


items.push(item);
}


return items;
};


// find nearest parent element
var closest = function closest(el, fn) {
return el && (fn(el) ? el : closest(el.parentNode, fn));
};


var onThumbnailsClick = function(e) {
e = e || window.event;
e.preventDefault ? e.preventDefault() : e.returnValue = false;


var eTarget = e.target || e.srcElement;


var clickedListItem = closest(eTarget, function(el) {
return el.tagName === 'A';
});


if (!clickedListItem) {
return;
}


var clickedGallery = clickedListItem.parentNode;


var childNodes = clickedListItem.parentNode.childNodes, numChildNodes = childNodes.length, nodeIndex = 0, index;


for ( var i = 0; i < numChildNodes; i++) {
if (childNodes[i].nodeType !== 1) {
continue;
}


if (childNodes[i] === clickedListItem) {
index = nodeIndex;
break;
}
nodeIndex++;
}


if (index >= 0) {
openPhotoSwipe(index, clickedGallery);
}
return false;
};


var photoswipeParseHash = function() {
var hash = window.location.hash.substring(1), params = {};


if (hash.length < 5) { // pid=1
return params;
}


var vars = hash.split('&');
for ( var i = 0; i < vars.length; i++) {
if (!vars[i]) {
continue;
}
var pair = vars[i].split('=');
if (pair.length < 2) {
continue;
}
params[pair[0]] = pair[1];
}


if (params.gid) {
params.gid = parseInt(params.gid, 10);
}


return params;
};


var openPhotoSwipe = function(index, galleryElement, disableAnimation,
fromURL) {
var pswpElement = document.querySelectorAll('.pswp')[0], gallery, options, items;


items = parseThumbnailElements(galleryElement);


// define options (if needed)
options = {


galleryUID : galleryElement.getAttribute('data-pswp-uid'),


getThumbBoundsFn : function(index) {
// See Options->getThumbBoundsFn section of docs for more
// info
var thumbnail = items[index].el.children[0], pageYScroll = window.pageYOffset
|| document.documentElement.scrollTop, rect = thumbnail
.getBoundingClientRect();


return {
x : rect.left,
y : rect.top + pageYScroll,
w : rect.width
};
},


addCaptionHTMLFn : function(item, captionEl, isFake) {
if (!item.title) {
captionEl.children[0].innerText = '';
return false;
}
captionEl.children[0].innerHTML = item.title
+ '<br/><small>Photo: ' + item.author + '</small>';
return true;
}


};


if (fromURL) {
if (options.galleryPIDs) {
// parse real index when custom PIDs are used
// http://photoswipe.com/documentation/faq.html#custom-pid-in-url
for ( var j = 0; j < items.length; j++) {
if (items[j].pid == index) {
options.index = j;
break;
}
}
} else {
options.index = parseInt(index, 10) - 1;
}
} else {
options.index = parseInt(index, 10);
}


// exit if index not found
if (isNaN(options.index)) {
return;
}


var radios = document.getElementsByName('gallery-style');
for ( var i = 0, length = radios.length; i < length; i++) {
options.mainClass = 'pswp--minimal--dark';
options.barsSize = {
top : 0,
bottom : 0
};
options.captionEl = false;
options.fullscreenEl = false;
options.shareEl = false;
options.bgOpacity = 0.85;
options.tapToClose = true;
options.tapToToggleControls = false;
break;
}


if (disableAnimation) {
options.showAnimationDuration = 0;
}


// Pass data to PhotoSwipe and initialize it
gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items,
options);


// see: http://photoswipe.com/documentation/responsive-images.html
var realViewportWidth, useLargeImages = false, firstResize = true, imageSrcWillChange;


gallery
.listen(
'beforeResize',
function() {


var dpiRatio = window.devicePixelRatio ? window.devicePixelRatio
: 1;
dpiRatio = Math.min(dpiRatio, 2.5);
realViewportWidth = gallery.viewportSize.x
* dpiRatio;


if (realViewportWidth >= 1200
|| (!gallery.likelyTouchDevice && realViewportWidth > 800)
|| screen.width > 1200) {
if (!useLargeImages) {
useLargeImages = true;
imageSrcWillChange = true;
}


} else {
if (useLargeImages) {
useLargeImages = false;
imageSrcWillChange = true;
}
}


if (imageSrcWillChange && !firstResize) {
gallery.invalidateCurrItems();
}


if (firstResize) {
firstResize = false;
}


imageSrcWillChange = false;


});


gallery.listen('gettingData', function(index, item) {
if (useLargeImages) {
item.src = item.o.src;
item.w = item.o.w;
item.h = item.o.h;
} else {
item.src = item.m.src;
item.w = item.m.w;
item.h = item.m.h;
}
});


gallery.init();
};


// select all gallery elements
var galleryElements = document.querySelectorAll(gallerySelector);
for ( var i = 0, l = galleryElements.length; i < l; i++) {
galleryElements[i].setAttribute('data-pswp-uid', i + 1);
galleryElements[i].onclick = onThumbnailsClick;
}


// Parse URL and open gallery if it contains #&pid=3&gid=1
var hashData = photoswipeParseHash();
if (hashData.pid && hashData.gid) {
openPhotoSwipe(hashData.pid, galleryElements[hashData.gid - 1],
true, true);
}
};
initPhotoSwipeFromDOM('.demo-gallery');
})();

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