Are you able to hide an element in a transformation.
For example
<span class="a" data-blogid="<%#Eval("DocumentID")%><%#Eval("DocumentID")%></span> I want the last "DocumentID " to be on the page but not visible. Is that possible? Thanks.
Looks like your HTML is incorrect. Try this and add the style="display:none;" to the tag:
<span style="display: none;" class="a" data-blogid='<%#Eval("DocumentID")%>'><%#Eval("DocumentID")%></span>
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