Editing Template:Infobox/doc (section)

==== Hiding headers when all data fields are hidden ====
You can also make headers optional in a similar way. Consider this example:
{{Infobox
 | title   = Example of an undesirable header
 | header1 = Undesirable header
 |  label2 = Item 1      |   data2 =
 |  label3 = Item 2      |   data3 =
 |  label4 = Item 3      |   data4 =
 | header5 = Static header
 |  label6 = Static item |   data6 = Static value
}}
<pre style="overflow:auto">
{{Infobox
 | title   = Example of an undesirable header
 | header1 = Undesirable header
 |  label2 = Item 1      |   data2 =
 |  label3 = Item 2      |   data3 =
 |  label4 = Item 3      |   data4 =
 | header5 = Static header
 |  label6 = Static item |   data6 = Static value
}}
</pre>{{clear}}

If you want the first header to appear only if one or more of the data fields that fall under it are filled, one could use the following pattern as an example of how to do it:

{{Infobox
 | title   = Example of an optional header
 | header1 = {{ #if: {{{item1|}}}{{{item2|}}}{{{item3|}}} | Optional header }}
 |  label2 = Item 1      |   data2 = {{{item1|}}}
 |  label3 = Item 2      |   data3 = {{{item2|}}}
 |  label4 = Item 3      |   data4 = {{{item3|}}}
 | header5 = Static header
 |  label6 = Static item |   data6 = Static value
}}
<pre style="overflow:auto">
{{Infobox
 | title   = Example of an optional header
 | header1 = {{ #if: {{{item1|}}}{{{item2|}}}{{{item3|}}} | Optional header }}
 |  label2 = Item 1      |   data2 = {{{item1|}}}
 |  label3 = Item 2      |   data3 = {{{item2|}}}
 |  label4 = Item 3      |   data4 = {{{item3|}}}
 | header5 = Static header
 |  label6 = Static item |   data6 = Static value
}}
</pre>{{clear}}

header1 will be shown if any of item1, item2, or item3 is defined. If none of the three parameters are defined the header won't be shown and no emty row appears before the next static content. The trick to this is that the "#if" returns false only if there is nothing whatsoever in the conditional section, so only if all three of item1, item2 and item3 are undefined will the if statement fail.

Note that such trick may be sometimes very complex to test if there are many data items whose value depends on complex tests (or when a data row is generated by a recursive invokation of this template as a [[#Subboxes|subbox]]). Ideally, the Lua module supporting this template should now support a new way to make each header row autohideable by detecting if there is at least one non-empty data row after that header row (a parameter like "autohide header1 = yes", for example, would remove the need to perform the "#if" test so that we can just to define "header1 = Optional header"),