Presentation Pattern Catalog
2 Deletion
2-1 Delete Element Pattern
2-1-1 Description
If presentation logic is empty, the element is not printed out. This pattern is named 'Delete Element Pattern' or 'Dummy Element Pattern.'
2-1-2 Situation
This pattern enables you to delete dummy element in presentation data.
2-1-3 Example Code
Presentation Data:
<ul> <li>foo</li> <li id="dummy">bar</li> </ul>
Presentation Logic:
/* delete dummy element */
#dummy {
logic: {
}
}
Output Script:
<ul> <li>foo</li> </ul>
2-1-4 Supplement
Kwartz directive 'id="dummy:str"' lets you to use this pattern without presentation logic file.
Presentation Data:
<ul> <li>foo</li> <li id="dummy:d1">bar</li> </ul>
2-2 Delete Tag Pattern
2-2-1 Description
If you use only _cont and don't use _stag and _cont,
you can remove start and end tags of the element.
This pattern is named 'Delete Tag Pattern' or 'Dummy Tag Pattern.'
2-2-2 Situation
This pattern is very useful if you want to print tags according to condition.
2-2-3 Example Code
Presentation Data:
<a href="..." id="mark:next">Next</a>
Presentation Logic:
/* delete tags when url is empty */
#next {
attrs: "href" url;
logic: {
if !url || url.empty?
_cont
else
_stag
_cont
_etag
end
}
}
Output Script:
<% if !url || url.empty? %> Next<% else %> <a href="<%= url %>">Next</a> <% end %>