JavaScript 文件在浏览器中不工作，但它在 codepen 中工作

Question

我正在构建一个网页，该网页使用名为照片滑动 (http://photoswipe.com/) 的 JavaScript 应用程序。

我无法在本地浏览器中获取 JavaScript 到运行。

我已经在几个不同的浏览器中对此进行了测试。我已经仔细检查了代码中引用的所有文件名（包括大写）和位置。所有文件都以正确的格式存储在我的计算机上的同一文件夹中。我试过清除缓存。运行 JavaScript 所需的外部库在文件中的引用与在 Code Pen 中的引用相同。

它在 Code Pen 中工作得很好，就像这样：

http://codepen.io/anon/pen/XJEWEN

以下是我尝试在本地浏览器上运行的文件：

HTML

<!DOCTYPE html>
<html>
<head>

<!-- Core JS file -->
<script src="http://photoswipe.s3-eu-west-1.amazonaws.com/pswp/dist/photoswipe.min.js"></script>

<!-- UI JS file -->
<script src="http://photoswipe.s3-eu-west-1.amazonaws.com/pswp/dist/photoswipe-ui-default.min.js"></script>

 <!-- Link to JS document as it is in code-pen, on computer stored in same folder as HTML document-->
<script type="text/javascript" src="document.js"></script>

<!-- Link to main css document as it is in code-pen, on computer stored in same folder as HTML document-->
<link type="text/css" rel="stylesheet" href="main.css"/>

<!-- Core CSS file -->
<link rel="stylesheet" href="http://photoswipe.s3.amazonaws.com/pswp/dist/photoswipe.css"/>

<!-- Skin CSS file (styling of UI - buttons, caption, etc.)
 In the folder of skin CSS file there are also:
 - .png and .svg icons sprite, 
 - preloader.gif (for browsers that do not support CSS animations) -->
<link rel="stylesheet" href="http://photoswipe.s3.amazonaws.com/pswp/dist/default-skin/default-skin.css"/>

<meta charset="UTF-8">
<meta name="keywords" content="Photo, Web Design">
<meta name="description" content="Examples of ways that photos can be presented online">
<html lang="en-US">
</head>
<body>

<h2>Gallery 1</h2>

<div class="my-simple-gallery" itemscope itemtype="http://schema.org/ImageGallery">



<figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
  <a href="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg" itemprop="contentUrl" data-size="964x1024">
      <img src="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_m.jpg" itemprop="thumbnail" alt="Image description" />
  </a>
  <figcaption itemprop="caption description">Image caption 2.1</figcaption>
</figure>

<figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
  <a href="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg" itemprop="contentUrl" data-size="1024x683">
      <img src="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_m.jpg" itemprop="thumbnail" alt="Image description" />
  </a>
  <figcaption itemprop="caption description">Image caption 2.2</figcaption>
</figure>

<figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
  <a href="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_b.jpg" itemprop="contentUrl" data-size="1024x768">
      <img src="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_m.jpg" itemprop="thumbnail" alt="Image description" />
  </a>
  <figcaption itemprop="caption description">Image caption 2.3</figcaption>
</figure>


</div>



<!-- 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 slides in 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>
  </section>
</div>
</div>

</body>
</html>

CSS

.my-simple-gallery {
  width: 100%;
  float: left;
}
.my-simple-gallery img {
  width: 100%;
  height: auto;
}
.my-simple-gallery figure {
  display: block;
  float: left;
  margin: 0 5px 5px 0;
  width: 150px;
}
.my-simple-gallery figcaption {
  display: none;
}

*{margin:0;}

.my-simple-gallery {
  width: 100%;
  float: left;
}
 .my-simple-gallery img {
  width: 100%;
  height: auto;
}
 .my-simple-gallery figure {
  display: block;
  float: left;
  margin: 0 5px 5px 0;
  width: 150px;
 }
.my-simple-gallery figcaption {
  display: none;
 }

JavaScript

var initPhotoSwipeFromDOM = function(gallerySelector) {

// parse slide data (url, title, size ...) from DOM elements 
// (children of gallerySelector)
var parseThumbnailElements = function(el) {
    var thumbElements = el.childNodes,
        numNodes = thumbElements.length,
        items = [],
        figureEl,
        childElements,
        linkEl,
        size,
        item;

    for(var i = 0; i < numNodes; i++) {


        figureEl = thumbElements[i]; // <figure> element

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

        linkEl = figureEl.children[0]; // <a> element

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

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



        if(figureEl.children.length > 1) {
            // <figcaption> content
            item.title = figureEl.children[1].innerHTML; 
        }

        if(linkEl.children.length > 0) {
            // <img> thumbnail element, retrieving thumbnail url
            item.msrc = linkEl.children[0].getAttribute('src');
        } 

        item.el = figureEl; // save link to element for getThumbBoundsFn
        items.push(item);
    }

    return items;
};

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

// triggers when user clicks on thumbnail
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 && el.tagName.toUpperCase() === 'FIGURE');
    });

    if(!clickedListItem) {
        return;
    }


    // find index of clicked item
    var clickedGallery = clickedListItem.parentNode,
        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;
};

// parse picture index and gallery index from URL (#&pid=1&gid=2)
var photoswipeParseHash = function() {
    var hash = window.location.hash.substring(1),
    params = {};

    if(hash.length < 5) {
        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);
    }

    if(!params.hasOwnProperty('pid')) {
        return params;
    }
    params.pid = parseInt(params.pid, 10);
    return params;
};

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

    items = parseThumbnailElements(galleryElement);

    // define options (if needed)
    options = {
        index: index,

        // define gallery index (for URL)
        galleryUID: galleryElement.getAttribute('data-pswp-uid'),

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

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

        // history & focus options are disabled on CodePen
        // remove these lines in real life: 
       history: false,
       focus: false 

    };

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

    // 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
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 > 0 && hashData.gid > 0) {
    openPhotoSwipe( hashData.pid - 1 ,  galleryElements[ hashData.gid - 1 ], true );
}
};

// execute above function
initPhotoSwipeFromDOM('.my-simple-gallery');

我很难过。非常感谢一些指导让它在浏览器中工作。提前致谢。 :)

Answer 1

问题出在调用函数时。您正试图在元素呈现到页面之前找到这些元素。可以调用html文档末尾的函数：

<script>
    initPhotoSwipeFromDOM('.my-simple-gallery');
</script>

另一种方法是将 onload 添加到 body 标签中：

<body onload="initPhotoSwipeFromDOM('.my-simple-gallery')">

或者设置为window上的onload函数:

window.onload="initPhotoSwipeFromDOM('.my-simple-gallery');";

Answer 2

您需要将 link 添加到我没有看到的 js 库中。

<script src="https://code.jquery.com/jquery.min.js"></script>

也许我错过了。

JavaScript 文件在浏览器中不工作，但它在 codepen 中工作

JavaScript file not working in browser, however it does work in codepen

javascript

html

reference

photoswipe