Help:Sorting

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Tables can be made sortable via client-side JavaScript with class="sortable" (in combination with the usual formatting: class="wikitable sortable"). This works in MediaWiki 1.9 and above, which is installed in all Wikimedia projects.

A sortable table is identified by the arrows in each of its header cells. Clicking them will cause the table rows to sort based on the selected column, in ascending order first, and subsequently toggling between ascending and descending order. Links and other wiki-markup are not possible in headers.

JavaScript[edit]

The JavaScript code jquery.tablesorter.js (source) of the tablesorter is loaded by the ResourceLoader. Some sites may have a page MediaWiki:Common.js which adds and overrides some code. Browsers need to support JavaScript and it needs to be enabled for sorting to work.

Sort modes[edit]

As of version 1.16.5, the way items are sorted depends on the data type of the item currently in the first row. This is true for the top cell of the column in both ascending and descending order. To determine the data type, multiple cells are tested and the most appropriate format is chosen. Mismatches are possible. The sort order of a column can be forced. See the relevant section farther down.

Tags such as span or sup are ignored when determining data type.

Dates[edit]

Various date formats are supported, including those with localized month names. On the German Wikipedia, "16. März 2010" is correctly sorted as 2010-03-16

Most other numerical formats are supported as well, including those with different separators (such as . , ' or / ); On English Wikipedias dates are treated as US-Dates (eg. month-day-year) per default.

Numbers[edit]

The script can recognize numbers with different decimal separators (. and ,) as well as e/E numbers. However, numbers will be sorted alphanumerically (with 9 sorted after 10) unless this default behaviour is overridden. (See below.)

Text[edit]

Text is sorted in ASCII order (Any accented/special characters follow after the basic latin alphabet). This can be changed site wide by posting code like the following inside the common.js:

mw.config.set('tableSorterCollation', {'ä':'ae', 'ö' : 'oe', 'ß': 'ss', 'ü':'ue'});

Afterwards, all 'ä' will be sorted as if they were an ae etc. Partial list showing the default order: !"#$%&'()*+,-./09:;<=>?@[\]^_'az{|}~é—

Forcing the sort mode for a column[edit]

The sort mode can be manually specified by putting data-sort-type inside the header of the respective row. This functionality is based on tablesorter.com. The following (case-insensitive) values are valid for data-sort-type:

  • text
  • number
  • IPAddress
  • currency
  • url
  • isoDate
  • usLongDate
  • date
  • time

Example:

{|class="wikitable sortable"
! data-sort-type="date" | Date!!Name!!Height!!data-sort-type="number" |Salary 
|-
|01.10.1977||Smith||1.85||1,000.000
|-
|11.6.1972||Ray||1.89||900.000
|-
|1.9.1992||Bianchi||1.72||2,000.50
|}
Date Name Height Salary
01.10.1977 Smith 1.85 1,000.000
11.6.1972 Ray 1.89 900.000
1.9.1992 Bianchi 1.72 2,000.50

Examples[edit]

The first column demonstrates how plain numbers detected and sorted as numbers. The second column shows that with data-sort-type="number" in table header more content detected as numbers. The fourth column shows that with data-sort-value="…" a numeric sortvalue is defined, independent of the cell content.

numbers data-sort-type="number" data-sort-type="number"
-8e3 -8 e3 -8 e3
-3e-3 -3 e-3 -3 e-3
2.000 2-5 km² data-sort-value="3.5" 2-5 km²
3.99 3.99 km² 3.99 km²
4 4 km² 4 km²
90 % 90 Percent data-sort-value="90" about 90 Percent
1E2 100[1] 100[1]
1,000,000.0 1 000 000.0 data-sort-value="1e6" one Million

The thousand separator(,) and digits separator(.) depends on language specific configuration of the Mediawiki software. Currency symbols before or after numbers or the %-symbol will be sorted numerical.

currencies
$ 9
$ 80
$ 70
$ 600
currencies
9 €
80 €
70 €
600 €
currencies
£ 9
£ 80
£ 70
£ 600
currencies
¥ 9
¥ 80
¥ 70
¥ 600
percent
9 %
80 %
70 %
600 %
numbers
−7e270
-1.4285714285714E-13
999e9
7e270

Secondary sortkey[edit]

It is possible to sort by column A (primary sortkey), while for equal values in column A, sort by column B (secondary sortkey): first sort by A by clicking the sort button of column A once or twice, then, while holding the shift-key, click the sort button of column B once or twice.

Example:

First click on column Text and then, while holding the shift-key, on Numbers, you'll see that the ordering is on Text (1), Numbers (2).

Numbers Text Dates Currency More text
4 a 01.Jan.2005 4.20 row 1
5 a 05/12/2006 7.15 row 2
1 b 02-02-2004 5.00 row 3
1 a 02-02-2004 5.00 row 4
2 x 13-apr-2005 row 5
2 a 13-apr-2005 row 6
3 a 17.aug.2006 6.50 row 7
3 z 25.aug.2006 2.30 row 8
3 z 28.aug.2006 5.50 row 9
3 z 31.aug.2006 3.77 row 10
3 z 01.sep.2006 1.50 row 11
Bottom

Additional features[edit]

Excluding the last row from sorting[edit]

Sometimes it is helpful to exclude the last row of a table from the sorting process. This can be achieved by declaring the last row as a footer.

Wiki markup:

{|class="wikitable sortable"
!Name!!Surname!!Height
|-
|John||Smith||1.85
|-
|Ron||Ray||1.89
|-
|Mario||Bianchi||1.72
|-
! !!Average:||1.82
|}

What it looks like in your browser:

Name Surname Height
John Smith 1.85
Ron Ray 1.89
Mario Bianchi 1.72
Average: 1.82

Excluding the first row from sorting[edit]

The same can be applied for first rows as well, by declaring them as header using the same exclamation mark notation.

Name Surname Height
Average: 1.82
John Smith 1.85
Ron Ray 1.89
Mario Bianchi 1.72
Average: 1.82

Making a column unsortable[edit]

If you want a specific column not to be sortable, specify class="unsortable" in the attributes of its header cell.

Wiki markup:

{|class="wikitable sortable"
!Numbers!!Alphabet!!Dates!!Currency!!class="unsortable"|Unsortable
|-
|1||Z||02-02-2004||5.00||This
|-
|2||y||13-apr-2005||||Column
|-
|3||X||17.aug.2006||6.50||Is
|-
|4||w||01.Jan.2005||4.20||Unsortable
|-
|5||V||05/12/2006||7.15||See?
|-
!Total: 15!!!!!!Total: 29.55!!
|-
|}

What it looks like in your browser:

Numbers Alphabet Dates Currency Unsortable
1 Z 02-02-2004 5.00 This
2 y 13-apr-2005 Column
3 X 17.aug.2006 6.50 Is
4 w 01.Jan.2005 4.20 Unsortable
5 V 05/12/2006 7.15 See?
Total: 15 Total: 29.55 Original example

Keeping some rows together[edit]

If you want that a row will always be below the row just above it and will follow it around, no matter how the sorting is applied, specify class="expand-child" in the attribute of this row.

Wiki markup:

{| class="wikitable sortable"
! style="width:9em"| Country !!data-sort-type="number"| Area
|-
| France
| 674 843 km²
|- class="expand-child" style="font-size:85%; line-height:1.2; color:gray"
| colspan="2" | In Paris is the Eiffel Tower.
|-
| U.K.
| 242 495 km²
|- class="expand-child" style="font-size:85%; line-height:1.2; color:gray"
| colspan="2" | In the U.K. you cannot pay with euros.
|- class="expand-child" style="font-size:85%; line-height:1.2; color:gray"
| colspan="2" | And you drive on the left side of the road.
|-
| Germany
| 357 168 km² 
|- class="expand-child" style="font-size:85%; line-height:1.2; color:gray"
| colspan="2" | Germany includes the former DDR.
|}

What it looks like in your browser:

Country Area
France 674 843 km²
In Paris is the Eiffel Tower.
U.K. 242 495 km²
In the U.K. you cannot pay with euros.
And you drive on the left side of the road.
Germany 357 168 km²
Germany includes the former DDR.

Specifying a sort key[edit]

Sometimes the value of a cell is not correctly parsed or one wants to sort the row in a special way. (e.g. a cell containing 'John Doe' should actually be sorted as 'Doe' and not as 'John') This can be easily achieved by setting the data-sort-value attribute.

Note, however, that this makes use of a new feature in HTML5, which is enabled by default in MediaWiki (including WMF wikis since September 2012 cfr. bugzilla:27478).

Wiki markup:

{|class="wikitable sortable"
!Name and Surname!!Height
|-
|data-sort-value="Smith, John"|John Smith||1.85
|-
|data-sort-value="Ray, Ian"|Ian Ray||1.89
|-
|data-sort-value="Bianchi, Zachary"|Zachary Bianchi||1.72
|-
!Average:||1.82
|}

This gives:

Name and Surname Height
John Smith 1.85
Ian Ray 1.89
Zachary Bianchi 1.72
Average: 1.82

The old version was to set hidden sortkey with w:Template:Sort. See also mediawiki.org.

If you put in data-sort-value the same content as above row, keep this rows together. The original mutual order of these rows is preserved. A better way for this is class expand-child, see above #Keeping some rows together.

Example where data-sort-value is used is the case for the rows about the Netherlands:

{|class="wikitable sortable"
!Country/province!!Capital
|-
|France||Paris
|-
|Netherlands||Amsterdam
|-
|data-sort-value=Netherlands|South Holland||data-sort-value=Amsterdam|The Hague
|-
|U.K.||London
|}
Country/province Capital
France Paris
Netherlands Amsterdam
South Holland The Hague
U.K. London

Special dates[edit]

For years BC we can use, for example, !9937-09-23 for -0062-09-23 (subtract the year number BC from 10000, or the absolute value of the astronomical year from 9999).

If a table column contains any or all incomplete dates, this will not cause sorting problems. If only a year and month are given, that incomplete date is positioned alphabetically before the first day of the month in question. Likewise, if only a year is given, the date is positioned before the first month or day given for that year.

Use of #time[edit]

Using parser function #time we can put <span style="display:none">&{{#expr:3e11+{{#time:U|..}}}}</span> in front of the displayed date. This works in the range 1 Jan 111, 00:00:00 through 31 Dec 9999, 23:59:59 for the proleptic Gregorian calendar. The added value makes all values positive and the same length (if scientific format would show up an additional step is needed to prevent this). The "&" forces string sort mode.

Dates and times can be entered in any php date/time format. Note that when we have just a year, a month (typically Jan) must be added in the hidden part.

Example using Help:Sorting/date:

input date text date and time as interpreted, with hidden sortkey input with visible sortkey input with hidden sortkey Unix time
010203 &301455411723 14 Feb 2016 01:02:03 &301455411723 010203 &301455411723 010203 1455411723
1/2 &301451692800 02 Jan 2016 00:00:00 &301451692800 1/2 &301451692800 1/2 1451692800
1/2/3 &301041465600 02 Jan 2003 00:00:00 &301041465600 1/2/3 &301041465600 1/2/3 1041465600
1-2-2003 &301044057600 01 Feb 2003 00:00:00 &301044057600 1-2-2003 &301044057600 1-2-2003 1044057600
1-2-3 &300981158400 03 Feb 2001 00:00:00 &300981158400 1-2-3 &300981158400 1-2-3 981158400
2007 &301167609600 01 Jan 2007 00:00:00 &301167609600 2007 &301167609600 2007 1167609600
1 Jan 111, 00:00:00 &241335609600 01 Jan 0111 00:00:00 &241335609600 1 Jan 111, 00:00:00 &241335609600 1 Jan 111, 00:00:00 -58664390400
31 Dec 9999, 23:59:59 &553402300799 31 Dec 9999 23:59:59 &553402300799 31 Dec 9999, 23:59:59 &553402300799 31 Dec 9999, 23:59:59 253402300799
Sep 1970 &300020995200 01 Sep 1970 00:00:00 &300020995200 Sep 1970 &300020995200 Sep 1970 20995200
1970 &300000000000 01 Jan 1970 00:00:00 &300000000000 1970 &300000000000 1970 0
Jun 2007 or later &301180656000 01 Jun 2007 00:00:00 or later &301180656000 Jun 2007 or later &301180656000 Jun 2007 or later 1180656000 or later
Jun 2007 perhaps earlier &301180656000 01 Jun 2007 00:00:00 perhaps earlier &301180656000 Jun 2007 perhaps earlier &301180656000 Jun 2007 perhaps earlier 1180656000 perhaps earlier
2007-6 &301180656000 01 Jun 2007 00:00:00 &301180656000 2007-6 &301180656000 2007-6 1180656000
Jun 2007 &301180656000 01 Jun 2007 00:00:00 &301180656000 Jun 2007 &301180656000 Jun 2007 1180656000
4 Jun 2007 &301180915200 04 Jun 2007 00:00:00 &301180915200 4 Jun 2007 &301180915200 4 Jun 2007 1180915200
3 Jul 2007 &301183420800 03 Jul 2007 00:00:00 &301183420800 3 Jul 2007 &301183420800 3 Jul 2007 1183420800
12 Aug 2006 &301155340800 12 Aug 2006 00:00:00 &301155340800 12 Aug 2006 &301155340800 12 Aug 2006 1155340800
1 Mar 2006 -1day &301141084800 28 Feb 2006 00:00:00 &301141084800 1 Mar 2006 -1day &301141084800 1 Mar 2006 -1day 1141084800
1 Mar 2008 -1day &301204243200 29 Feb 2008 00:00:00 &301204243200 1 Mar 2008 -1day &301204243200 1 Mar 2008 -1day 1204243200
1 Mar 2010 -1day &301267315200 28 Feb 2010 00:00:00 &301267315200 1 Mar 2010 -1day &301267315200 1 Mar 2010 -1day 1267315200
1 Mar 1900 -1day &297796022400 28 Feb 1900 00:00:00 &297796022400 1 Mar 1900 -1day &297796022400 1 Mar 1900 -1day -2203977600
1 Mar 1600 -1day &288329001600 29 Feb 1600 00:00:00 &288329001600 1 Mar 1600 -1day &288329001600 1 Mar 1600 -1day -11670998400
Jun 1607 &288557875200 01 Jun 1607 00:00:00 &288557875200 Jun 1607 &288557875200 Jun 1607 -11442124800
20160214202214 &301455481334 14 Feb 2016 20:22:14 &301455481334 20160214202214 &301455481334 20160214202214 1455481334
yesterday &301455321600 13 Feb 2016 00:00:00 &301455321600 yesterday &301455321600 yesterday 1455321600
today &301455408000 14 Feb 2016 00:00:00 &301455408000 today &301455408000 today 1455408000
tomorrow &301455494400 15 Feb 2016 00:00:00 &301455494400 tomorrow &301455494400 tomorrow 1455494400
1week &301456086134 21 Feb 2016 20:22:14 &301456086134 1week &301456086134 1week 1456086134
-1week &301454876534 07 Feb 2016 20:22:14 &301454876534 -1week &301454876534 -1week 1454876534
1day &301455567734 15 Feb 2016 20:22:14 &301455567734 1day &301455567734 1day 1455567734
-1day &301455394934 13 Feb 2016 20:22:14 &301455394934 -1day &301455394934 -1day 1455394934
1month &301457986934 14 Mar 2016 20:22:14 &301457986934 1month &301457986934 1month 1457986934
-1month &301452802934 14 Jan 2016 20:22:14 &301452802934 -1month &301452802934 -1month 1452802934
1year &301487103734 14 Feb 2017 20:22:14 &301487103734 1year &301487103734 1year 1487103734
-1year &301423945334 14 Feb 2015 20:22:14 &301423945334 -1year &301423945334 -1year 1423945334
1000year &333012390134 14 Feb 3016 20:22:14 &333012390134 1000year &333012390134 1000year 33012390134
10000month &327752876534 14 Jun 2849 20:22:14 &327752876534 10000month &327752876534 10000month 27752876534
1000000day &387855481334 11 Jan 4754 20:22:14 &387855481334 1000000day &387855481334 1000000day 87855481334
10000000hour &337455481334 01 Dec 3156 12:22:14 &337455481334 10000000hour &337455481334 10000000hour 37455481334
1000000000minute &361455481334 13 Jun 3917 07:02:14 &361455481334 1000000000minute &361455481334 1000000000minute 61455481334
100000000000second &401455481334 30 Dec 5184 06:08:54 &401455481334 100000000000second &401455481334 100000000000second 101455481334
7980year &553279945334 14 Feb 9996 20:22:14 &553279945334 7980year &553279945334 7980year 253279945334
-1890year &241812870134 14 Feb 0126 20:22:14 &241812870134 -1890year &241812870134 -1890year -58187129866
Mon &301455494400 15 Feb 2016 00:00:00 &301455494400 Mon &301455494400 Mon 1455494400
Tue &301455580800 16 Feb 2016 00:00:00 &301455580800 Tue &301455580800 Tue 1455580800
Wed &301455667200 17 Feb 2016 00:00:00 &301455667200 Wed &301455667200 Wed 1455667200
Thu &301455753600 18 Feb 2016 00:00:00 &301455753600 Thu &301455753600 Thu 1455753600
Fri &301455840000 19 Feb 2016 00:00:00 &301455840000 Fri &301455840000 Fri 1455840000
Sat &301455926400 20 Feb 2016 00:00:00 &301455926400 Sat &301455926400 Sat 1455926400
Sun &301455408000 14 Feb 2016 00:00:00 &301455408000 Sun &301455408000 Sun 1455408000
&Expression error: Unexpected < operator. Error: Invalid time. &Expression error: Unexpected < operator. &Expression error: Unexpected < operator. Error: Invalid time.
unknown &Expression error: Unexpected < operator. Error: Invalid time. &Expression error: Unexpected < operator. unknown &Expression error: Unexpected < operator. unknown Error: Invalid time.

To use dates before the year 111, add a multiple of 400, e.g. 6000, to all years, this effectively shifts the range to 1 Jan -5889, 00:00:00 through 31 Dec 3999, 23:59:59, without changing the calendar.

See also:

  • w:Template:Dts - sorting a table by a date column
  • Template:Sd - shows weekday in a separate column before date, and link all dates

Cell spanning multiple rows/cells[edit]

A cell which spans more than one row or column is treated as if it were multiple cells with the same value.

rowspan
Date Name Height
01.10.1977 Smith 1.85
11.06.1972 Adams
01.09.1992 Bianchi 1.72
colspan
A B C
A 2 1
B 1 3
C 2

As of MediaWiki Version 1.26 wmf23 (Sept. 2015), sorting of colspanned cells works correctly. Also, missing cells at the end of a row will change after first sort into cells with empty content.

Colspanned cells[edit]

The auto-detection of sort mode is done for colspanned cells for each column separately. Defining the sort mode by putting data-sort-type inside the header will specify this sort mode for all colspanned columns.

To use separate sortkeys for each column in a colspanned cell, use the CSS hack described here: To allow sorting, the formal number of cells in each row should be equal (If not, all columns become sortable. This should apply at least for the number of cells up to and including the last sortable column.) However, with a CSS hack the number of cells shown in a row can differ from the formal number of cells. For example, two formal cells can be shown as one by specifying a width for the first column, shifting the contents of the second cell to the left, increasing its width by the same amount, and hiding the cell border that would normally be visible. Hidden sortkeys can be used to control the sort order of particular rows with respect to each column.

Example:

Country Capital
France Paris
Z M
Sorting with respect to the first column this row sorts like Z, with respect to the second column like M
U.K. London

Controlling sorting and display[edit]

Text undesired for sorting but needed for display:

  • In numeric sorting mode, the sorting will still work properly even though the cell (except the cell of the first data row) contains text after numbers (e.g. "200 approx"). Empty cell is treated as "zero" when sorting numerically. See e.g. Help:Sorting/countries. However bear in mind that the cell of the first data row will change accordingly after sorting. If that cell no longer contains number only after sorting, the sorting mode will change. For example, if the cell of the first data row becomes "200 approx" after sorting, this will make the sorting mode alphabetic.
  • In date sorting mode, this text needs to be put in a separate column; in the case of a cell containing a range of dates or numbers (e.g. from .. to ..), text in surplus of what is required for sorting is put in the extra column. If the first part of the text is used for sorting, then the extra column needs to be the following one; conversely, if the last part of the text is used for sorting, then the extra column needs to be the previous one; depending on the table format, this dividing of an item over two cells may look ugly.
  • In alphabetic sorting, any footnotes etc. do not require a separate column; they can simply be put at the end of the element.


Static column[edit]

A static column, e.g. with row numbers, can be obtained with two side-by-side tables with for each row the same height set in both tables:

Number
1
2
Country Capital
The Netherlands Amsterdam (although The Hague is the seat of government)
France Paris

The style can be adjusted to make it appear as a single table. If for some row the height of that row is too small for the text in a cell on one of the sides, the browser increases it, and there is no longer a match.

Default order[edit]

It is not possible to make a table appear sorted by a certain column without the user clicking on it. By default, the rows of a table always appear in the same order as in the wikitext. If you want a table to appear sorted by a certain column, you must sort the wikitext itself in that order; see the next section for one way to do this.

Sorting the wikitext of a table[edit]

Sorting the wikitext itself, thus creating a new default sort order, can be done semi-automatically as follows. Take the wikitext of the table without top and bottom lines. Use "find and replace" to replace the cell separators with special code not containing "|". If there are pipes in the table cells, replace all pipes by some code, and replace that code with a newline in front of it (originating from the code for the start of a new row) back. Apply mw:Module:Sort (see mw:Module talk:Sort) at mw:Special:ExpandTemplates by putting: {{#invoke:Sort|f|{{!}}-
{{!}} (with the newline) before, and }} after the wikitext, to sort the items between the pipes, with the desired separator in the result. Discard the items at the start containing "-" and a newline. Restore the cell separators and the pipes in the cells by replacing the temporary codes for them. Readd the top and bottom lines.

This method sorts by the wikitext of the rows, so in principal by the first column (and the second as secondary key), although wikitext codes in the cells of the first column before the content can affect the order.

Using JavaScript to trigger client-side table sorting[edit]

An addition to MediaWiki:Common.js can be used to "re-sort" a table automatically on the client side when the page loads (as if the user had clicked the header.) The example below sorts all the tables on a set of pages by the first column (see the Tablesorter documentation for syntax.)

function isSortedTablePage() {
    return ( wgPageName == "Page_To_Sort"  || wgPageName == "Other_Page_To_Sort" );
}

jQuery( document ).ready( function( $ ) {
    // wrapped in "mw.loader.using" so this doesn't execute until Tablesorter has loaded
    mw.loader.using( 'jquery.tablesorter', function() {
        if( isSortedTablePage() ) $('table.sortable').tablesorter( {sortList: [[0]]} )
        // or look for tables with an ID attribute of "sortMe" on any page
        // $( '#sortMe' ).tablesorter( {sortList: [[0]]} )
    } );
} );

Basic alphabetic sorting order[edit]

demo
!
"
#
$
 %
&
'
(
)
*
+
,
-
.
/
0
9
:
;
<
=
>
?
@
[
\
]
^
_
`
A
Z
a
z
A1
Z1
a1
z1
{
|
}
~
É
é
É1
é1

The two-character entries such as A1 demonstrate that A and a are at the same position.

This is not a fully alphabetic sort order: letter case is first folded to lowercase using a basic 1-to-1 conversion table (limited to the Basic Multilingual Plane of Unicode, and whose coverage and completeness still depends on browser versions and on their current implementation of the versioned Unicode Character Database), but letters with diacritics (and all other digits, symbols or special whitespaces or format control characters) will still sort according to the binary encoding of the casefolded letter, using the binary order of the UTF-16 code units (exposed and seen in Javascript through the parsed HTML DOM), but not the binary order of UTF-8 code units in the HTML page, and not of codepoints as one could also expect for encoded characters in supplementary planes).

In addition, no normalization of the Unicode text is being performed (so canonically equivalent strings, that should compare equal or with only very minor binary difference, may sometimes compare very far away, with completely different strings interleaved between them). For this reason, MediaWiki pages should always be encoded with their text in the Normalized Form C (preComposed), as recommended in the HTML standards.

As of today, an UCA-based sort is still not implemented in the client-side Javascript code, but some wikis are implementing a limited form of multilevel collation using custom basic replacement rules tuned for specific languages.

Server issue[edit]

It has been observed that the MediaWiki code on the server replaces a regular space before "!" by a non-breaking space &#160;, affecting the sorting order. To avoid this, this blank space can be coded as &#32;, or the exclamation mark may be surrounded by <nowiki> and </nowiki> tags. This is to comply with French typographic rules, where exclamation marks (and a few other punctuations) must be preceded (or sometimes followed) by a space (preferably narrow) which must still be unbreakable when it is effectively needed and present, the substitution being performed as an convenient editing facility of the Wiki code for cases that are very frequent within many texts.

Persistent sort states using cookies[edit]

Adding this snippet to your MediaWiki:Common.js page will make the sortable tables remember their columns sort states in a cookie so they look the same next time the page is visited. Each sortable table must have a unique id attribute for its state to be stored in the cookie.

addOnloadHook( function() {
    jQuery('.sortable').each( function() {
        var id = jQuery(this).attr('id');
        document.shCookie = getCookie('sortheader-'+id);
        document.sortheaderId = 0;
        jQuery('#'+id+' a.sortheader').each( function() {
            var id = jQuery(this).parent().parent().parent().parent().attr('id');
            var sh = document.sortheaderId++;
            if( sh+100 == document.shCookie ) { ts_resortTable(this); ts_resortTable(this); }
            if( sh == document.shCookie ) { ts_resortTable(this); sh += 100; }
            jQuery(this).bind('click', {id: id, sh: sh}, function(e) {
                setCookie('sortheader-'+e.data.id, e.data.sh, 1);
                e.data.sh += e.data.sh < 100 ? 100 : -100;
            });
        });
    });
});

function setCookie(c_name,value,exdays) {
    var exdate=new Date();
    exdate.setDate(exdate.getDate() + exdays);
    var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
    document.cookie=c_name + "=" + c_value;
}

function getCookie(c_name) {
    var i,x,y,ARRcookies=document.cookie.split(";");
    for (i=0;i<ARRcookies.length;i++) {
        x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
        y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
        x=x.replace(/^\s+|\s+$/g,"");
        if (x==c_name) return unescape(y);
    }
}

See also[edit]

Examples elsewhere: