silverstripe - How to create a unique name when looping through each new category? -


i need way each new category have unique name in data attribute.

below how code runs , displays:

e.g

category one

picture 1 | picture 2 | picture 3

category two

picture 1 | picture 2 | picture 3 | picture 4

category three

picture 1 | picture 2

what need when starts loop on each new category, every <a> in servicepagesvtsliders loop needs add 1 (or similar) data-gall="mygallery">. way create unique group category. , when lightbox pops when link clicked cycle through particular images/iframes category instead of cycling through everything.

e.g

category one

data-gall="mygallery"> * 3 category 1
data-gall="mygallery1"> * 4 category 2
data-gall="mygallery2"> * 2 category 3

my code:

<% loop svtcategorys %>     <div class="svt-service-row">         <div>            <h2 class="svt-service-heading">$categoryname</h2>         </div>         <div>         <% loop servicepagesvtsliders %>           <a class="venobox_custom"           data-type="iframe" href="$svtsliderlink" data-gall="mygallery">            ... (image sits in here)          </a>        <% end_loop %> <% end_loop %>

lightbox using: http://lab.veno.it/venobox/

you use $pos returns position of current loop. if need position of parent can use $up.pos

<% loop svtcategorys %> <div class="svt-service-row">     <div>        <h2 class="svt-service-heading">$categoryname</h2>     </div>     <div>     <% loop servicepagesvtsliders %>       <a class="venobox_custom"       data-type="iframe" href="$svtsliderlink" data-gall="mygallery$up.pos">        ... (image sits in here)      </a>    <% end_loop %> <% end_loop %>

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