Uncaught ReferenceError: PhotoSwipe is not defined at openPhotoSwipe

Question

at the beginning of using PhotoSwipe I have issue with

Uncaught ReferenceError: PhotoSwipe is not defined at openPhotoSwipe (base.js:1821) at base.js:1825

I have properly imported Core CSS file, Skin CSS file, Core JS file and UI JS file as described at official PhotoSwipe site - Initialization - Step 1: include JS and CSS files

http://photoswipe.com/documentation/getting-started.html

Then, I followed step 2, copy complete HTML code and paste in my Code Editor

Step 3... JavaScript implementation (from official PhotoSwipe site)

// PhotoSwipe
var openPhotoSwipe = function() {
    var pswpElement = document.querySelectorAll('.pswp')[0];

    // build items array
    var items = [{
        src: 'https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg',
        w: 964,
        h: 1024
      },
      {
        src: 'https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg',
        w: 1024,
        h: 683
      }
    ];

    // define options (if needed)
    var options = {
      // optionName: 'option value'
      // for example:
      index: 0 // start at first slide
    };

    var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options); < --In Console this is the problem

    gallery.init();
    };

openPhotoSwipe();

document.getElementById('btn').onclick = openPhotoSwipe;

<!-- 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. -->
    <div class="pswp__container">
      <!-- don't modify these 3 pswp__item elements, data is added later on -->
      <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>

One note: When I remove openPhotoSwipe(); from JavaScript, and when click on button to open photoswipe, there is no error in console, but open slider with very strange css, practically open an image but I can not change images because no arrows and css is something strange.

Practically I want to load slider immediately without clicking on the button.

Any idea how to solve this issue?

Answer 1

I can not see you whole page i think that you are trying to invoke PhotoSwipe before you load the library. Roughly speaking, your code should look like this:

<head>
    <script src="path/to/photoswipe.min.js"></script>
    <script src="path/to/photoswipe-ui-default.min.js"></script>
    <link rel="stylesheet" href="path/to/photoswipe.css">
    <link rel="stylesheet" href="path/to/default-skin/default-skin.css">
</head>
<body>
    Your content...
    <script>
        var openPhotoSwipe = function() {
            var pswpElement = document.querySelectorAll('.pswp')[0];
            var items = [{
                src: 'https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg',
                w: 964,
                h: 1024
            },
              {
                  src: 'https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg',
                  w: 1024,
                  h: 683
              }
            ];
            var options = {
                index: 0
            };
            var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options); < --In Console this is the problem
            gallery.init();
        };
        openPhotoSwipe();
        document.getElementById('btn').onclick = openPhotoSwipe;
    </script>
</body>