Use class selector on shopitem
and use data
method on that:
console.log($('.shopitem').data('minitooltip'));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a class="shopitem" data-minitooltip="item_123"><img src="#" alt=""></a>
You can also use attr
method:
console.log($('.shopitem').attr('data-minitooltip'));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a class="shopitem" data-minitooltip="item_123"><img src="#" alt=""></a>