无法读取未定义的属性“getAttribute”

Question

I readed almost all the post on stackoverflow with similar title but i can't find the solution of this problem. I'm using the https://photoswipe.com/ Photoswipe js plugin to make a gallery with photos . I have a problem, I downloaded the Github example ( https://codepen.io/dimsemenov/pen/ZYbPJM ) and on the dist folder I opened the index.html file and it's works well. I copied all the code on my site and don't work, It shows me on console each time I click on the gallery :

Cannot read property 'getAttribute' of undefined

The code shows on the line 25 of this file: https://www.fundacioncb.es/wp-content/themes/construction/js/script.js

You can see the page with the error here: https://www.fundacioncb.es/cesion-espacio-badajoz/

HTML Structure of the gallery:

<h2>First gallery:</h2>

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

    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm3.staticflickr.com/2567/5697107145_a4c2eaa0cd_o.jpg" itemprop="contentUrl" data-size="1024x1024">
          <img src="https://farm3.staticflickr.com/2567/5697107145_3c27ff3cd1_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
                                          <figcaption itemprop="caption description">Image caption  1</figcaption>

    </figure>

    <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">
      </a>
      <figcaption itemprop="caption description">Image caption 2</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">
      </a>
      <figcaption itemprop="caption description">Image caption 3</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">
      </a>
      <figcaption itemprop="caption description">Image caption 4</figcaption>
    </figure>


  </div>

<h2>Second gallery:</h2>

  <div class="my-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>

How Can i fix it?

Thanks.

Answer 1

The problem is the p html element, because it is in you children list. Either remove it or try this:

if(linkEl.tagName == 'A' || linkEl.tagName == 'a') {
  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);
}

Answer 2

解决方案是删除 Wordpress 在 Wordpress HTML 编辑器上自动生成的p标签。