JS PhotoSwipe 相册插件
🏷️ JavaScript
给网站的博客图片增加了点击预览功能，使用的 PhotoSwipe 插件。参照 Getting Started 中的代码，实现了点击图片时弹出图片预览功能（预览当前博客中的所有图片）。
1. 引用 CSS 和 JS 文件
这里使用了 BootCDN 。
html
<link href="https://cdn.bootcss.com/photoswipe/4.1.2/photoswipe.min.css" rel="stylesheet">
<link href="https://cdn.bootcss.com/photoswipe/4.1.2/default-skin/default-skin.min.css" rel="stylesheet">
<script src="https://cdn.bootcss.com/photoswipe/4.1.2/photoswipe.min.js"></script>
<script src="https://cdn.bootcss.com/photoswipe/4.1.2/photoswipe-ui-default.min.js"></script>2. 在页面上添加 HTML 代码
html
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<!-- Background of PhotoSwipe.
It's a separate element as animating opacity is faster than rgba(). -->
<div class="pswp__bg"></div>
<!-- Slides wrapper with overflow:hidden. -->
<div class="pswp__scroll-wrap">
<!-- Container that holds slides.
PhotoSwipe keeps only 3 of them in the DOM to save memory.
Don't modify these 3 pswp__item elements, data is added later on. -->
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<!-- Controls are self-explanatory. Order can be changed. -->
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
<!-- element will get class pswp__preloader--active when preloader is running -->
<div class="pswp__preloader">
<div class="pswp__preloader__icn">
<div class="pswp__preloader__cut">
<div class="pswp__preloader__donut"></div>
</div>
</div>
</div>
</div>
<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
<div class="pswp__share-tooltip"></div>
</div>
<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)"></button>
<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)"></button>
<div class="pswp__caption">
<div class="pswp__caption__center"></div>
</div>
</div>
</div>
</div>3. 添加初始化的 JS 代码
js
let initPhotoSwipeFromDOM = function (imgSelector) {
// parse slide data (url, title, size ...) from DOM elements
// (children of imgSelector)
let parseThumbnailElements = function (els) {
let items = [];
for (let i = 0; i < els.length; i++) {
let el = els[i];
// create slide object
let item = {
src: el.getAttribute('src'),
w: el.naturalWidth,
h: el.naturalHeight
};
if (el.getAttribute('alt').length > 1) {
item.title = el.getAttribute('alt');
}
item.el = el; // save link to element for getThumbBoundsFn
items.push(item);
}
return items;
};
// find nearest parent element
let closest = function closest(el, fn) {
return el && (fn(el) ? el : closest(el.parentNode, fn));
};
// triggers when user clicks on thumbnail
let onThumbnailsClick = function (e) {
e = e || window.event;
e.preventDefault ? e.preventDefault() : e.returnValue = false;
let clickedListItem = e.target || e.srcElement;
if (!clickedListItem) {
return;
}
let imgElements = document.querySelectorAll(clickedListItem.getAttribute('data-pswd-selector'));
let index = clickedListItem.getAttribute('data-pswp-index');
if (index >= 0) {
// open PhotoSwipe if valid index found
openPhotoSwipe(index, imgElements);
}
return false;
};
let openPhotoSwipe = function (index, galleryElement, disableAnimation, fromURL) {
let pswpElement = document.querySelectorAll('.pswp')[0],
gallery,
options,
items;
items = parseThumbnailElements(galleryElement);
// define options (if needed)
options = {
getThumbBoundsFn: function (index) {
// See Options -> getThumbBoundsFn section of documentation for more info
let thumbnail = items[index],
pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
rect = thumbnail;
return { x: rect.left, y: rect.top + pageYScroll, w: rect.width };
}
};
// PhotoSwipe opened from URL
if (fromURL) {
if (options.galleryPIDs) {
// parse real index when custom PIDs are used
// http://photoswipe.com/documentation/faq.html#custom-pid-in-url
for (let j = 0; j < items.length; j++) {
if (items[j].pid == index) {
options.index = j;
break;
}
}
} else {
// in URL indexes start from 1
options.index = parseInt(index, 10) - 1;
}
} else {
options.index = parseInt(index, 10);
}
// exit if index not found
if (isNaN(options.index)) {
return;
}
if (disableAnimation) {
options.showAnimationDuration = 0;
}
options.closeOnScroll = false;
options.shareButtons = [
{ id: 'download', label: '下载图片', url: '{{raw_image_url}}', download: true }
],
// Pass data to PhotoSwipe and initialize it
gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options);
gallery.init();
};
// loop through all gallery elements and bind events
let imgElements = document.querySelectorAll('img');
for (let i = 0, l = imgElements.length; i < l; i++) {
// imgElements[i].setAttribute('data-pswp-uid', i + 1);
imgElements[i].setAttribute('data-pswp-index', i);
imgElements[i].setAttribute('data-pswd-selector', imgSelector);
imgElements[i].onclick = onThumbnailsClick;
}
};
// execute above function
initPhotoSwipeFromDOM('.blog img');附
1. Options
可以参照 Options 配置初始化选项。