Demo:IfStatement

This page tries to use a set of nested If Statement to demonstrate the logic of Template inclusion:

For example: If there is a book citation, it can be included using the PageName instruction.

{{:Cite:book:Working with MediaWiki}}

Koren, Yaron (2020). Working with MediaWiki (2nd ed.). local page: WikiWorks Press. ISBN 978-1540761149. 

This entry has many attributes, some of the attributes may have empty(null) value. The goal is to demonstrate that we can use the {{#If condition| YES | NO}} structure to determine how to show certain content or not.

For example: The data content in Koren, Yaron (2020). Working with MediaWiki (2nd ed.). local page: WikiWorks Press. ISBN 978-1540761149.  can be seen here:

{{cite book
 |last=Koren
 |first=Yaron
 |author-link=Yaron Koren
 |title=Working with MediaWiki
 |edition=2nd
 |url=https://workingwithmediawiki.com
 |location=
 |publisher=WikiWorks Press
 |page= <!-- or pages= -->
 |isbn=978-1540761149
 |date=2020
}}

Simple Case

Knowing that YES can decide whether to show something or not, this feature can be applied in the following way.

{{#If: 1 |Something to show | Nothing to show|}}

The following is the actual result:

Something to show

{{#If:  |Something to show | Nothing to show|}}

The following is the actual result:

Nothing to show

Template Coding

Knowing this feature, we can judge whether certain portion of a template would show or not.

For example, we can decide when a person doesn't have first and last name, the rendering result would raise some alarm:

{{cite book
 |last=
 |first=Yaron
 |author-link=Yaron Koren
 |title=Working with MediaWiki
 |edition=2nd
 |url=https://workingwithmediawiki.com
 |location=
 |publisher=WikiWorks Press
 |page= <!-- or pages= -->
 |isbn=978-1540761149
 |date=2020
}}

Rendered result: Working with MediaWiki (2nd ed.). WikiWorks Press. 2020. ISBN 978-1540761149.