Wikipedia:Collapsible tables
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Wikipedia:Collapsible_tables".

Collapsible tables provide a way to collapse and uncollapse a table when a show/hide button is clicked. The code for this feature is found in the MediaWiki:Common.js.

The initial state of any collapsible content can be controlled using a "collapsible table", because it also allows a table with only one element with content, and a header.

Simple example

Tables are simpler to work with, as you merely need to add the collapsible class to the table itself. For the [hide]/[show] link to appear, the table's first row must be a header row, that is, one of the cells in the first row must be declared with an exclamation mark (in wikisyntax). The use of the class wikitable in the example below is merely for appearance; it is not needed for collapsible to function.

{| class="wikitable collapsible"
! Simple collapsible table
|-
| Lorem ipsum dolor sit amet
|}

Using the syntax above, collapsible tables are often used to always display an introduction to, or summary of, a lengthy discussion or section of content, while hiding the majority of that content from immediate view. The summary message is put in the header cell, and the content is placed into the body cell. The content is then easily accessible by clicking the 'show' button. The collapsible functionality is also available in larger and more complicated tables, as long as there is a header cell in the first row of the table.

{| class="wikitable collapsible"
 |A normal cell in the header row
 ! colspan="2"| Header cell spans two cols
 |-
 | colspan="2" | Lorem ipsum dolor sit amet
 | Separate body cell
 |}

Collapsing tables by default

Just using the collapsible class produces a table which is expanded by default, but can be collapsed by the reader. It is also possible to create tables which are collapsed by default, and can be optionally expanded. There are several methods for doing this, depending on the situations in which you want the table to collapse.

'collapsed'

Adding the collapsed class will cause the table to always be initially collapsed, no matter what happens around it. It is the simplest method for doing so. Using the examples above:

{| class="wikitable collapsible collapsed"
! Simple collapsible table
|-
| Lorem ipsum dolor sit amet
|}

{| class="wikitable collapsible collapsed"
 |A normal cell in the header row
 ! colspan="2"| Header cell spans two cols
 |-
 | colspan="2" | Lorem ipsum dolor sit amet
 | Separate body cell
 |}

'autocollapse'

Adding the autocollapse class causes the table to collapse when there are more than a threshold number of collapsible tables on the page. On en.wiki, this threshold is set at 2. So all tables on a page after the first will collapse if they have the autocollapse class. The example below, therefore, collapses because there are numerous collapsible tables higher on the page; if it were moved to the top of the list, it would not collapse by default.

{| class="wikitable collapsible autocollapse"
! Simple collapsible table
|-
| Lorem ipsum dolor sit amet
|}

'innercollapse' and 'outercollapse'

The code for this functionality was only recently added to MediaWiki:Common.js and so will not work correctly for all readers of wikipedia until 30 October 2008. When using this functionality before that time, be careful to ensure that the table would look right if it did not autocollapse. Please remove this notice after 30 October.

Using this pair of classes, it is possible to make a table collapsed by default only when it is contained within a particular object, such as another table.

{| class="wikitable outercollapse"
! This table does not collapse
|-
| But the table inside this cell

{| class="wikitable collapsible innercollapse"
! Does collapse
|-
| Hiding this part
|}

|}

Other notes

Sortable tables

Collapsible tables can be combined with the sortable tables functionality without difficulty. However, because the hide/show button is placed in the first header cell located, its positioning can look a bit peculiar if the table is not wide enough:

{| class="wikitable collapsible sortable"
!Name!!Score
|-
|John||59
|-
|Jane||100
|-
|Bob||72
|}

Customization

Registered users can edit their monobook.js file to change some of the variables used.

autoCollapse = 4 //how many collapsible tables on the page before autocollapse works (default=2)
var collapseCaption = 'collapse' //text of the [hide] link (default='hide')
var expandCaption = 'uncollapse' //text of the [show] link (default='show')

Other HTML elements

The code that performs the manipulation only checks for table elements, so these classes will not work for, for instance, <div> or <span> elements. There is a similar feature for use with <div> elements, called "NavFrame". See Wikipedia:NavFrame

See also

• m:Help:Collapsinghttp://meta.wikimedia.org/wiki/Help:Collapsing