javascript - How to pass data-index attribute to the index of photoswipe js? -

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in reference photoswipe js : http://photoswipe.com/documentation/getting-started.html

i'm having trouble passing data-index attribute index of photoswipe.

html:

    <td>         <div class="picture" itemscope="" itemtype="http://schema.org/imagegallery">             <figure style="display:initial;" itemprop="associatedmedia" itemscope="" itemtype="http://schema.org/imageobject">                 <a class="picture" href="images/an241_02.jpg" itemprop="contenturl" data-size="2000x1200" data-index="0" data-title="an241 02 55">                     <img class="lazy thumbnail " data-original="image_cache/an241_02-cache.jpg" itemprop="thumbnail" alt="image description" src="image_cache/an241_02-cache.jpg" style="display: inline;">                 </a>             <figcaption itemprop="caption description">description</figcaption>             </figure>         </div>     </td>

js:

var onthumbnailsclick = function(e) {     e = e || window.event;     e.preventdefault ? e.preventdefault() : e.returnvalue = false;      var etarget = e.target || e.srcelement;      // find root element of slide     var clickedlistitem = closest(etarget, function(el) {         return (el.tagname && el.tagname.touppercase() === 'figure');     });      });      if(!clickedlistitem) {         return;     }      // find index of clicked item looping through child nodes     // alternatively, may define index via data- attribute <---how?      var clickedgallery = clickedlistitem.parentnode,         childnodes = clickedlistitem.parentnode.childnodes,         numchildnodes = childnodes.length,         nodeindex = 0,         index;      (var = 0; < numchildnodes; i++) {         if(childnodes[i].nodetype !== 1) {              continue;          }          if(childnodes[i] === clickedlistitem) {             index = nodeindex;             break;         }         nodeindex++;     }       if(index >= 0) {         // open photoswipe if valid index found         openphotoswipe( index, clickedgallery );     }     return false; };

you can see above "data-index" attribute located in "a" tag , pass index in js.

apologies i'm not familiar js , appreciate here.

if need data-index, have value of attribute clicked element before last "if" statement, pass openphotoswipe init function :)

var newindex = parseint(etarget.parentnode.getattribute("data-index"));  if(newindex >= 0) {     // open photoswipe if valid index found     openphotoswipe( newindex, clickedgallery ); }

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