DPL:Manual - DPL parameters: Controlling output order

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Manual Controlling output order

DPL allows you to define the sort order of its output as is explained below.

In some cases this is not sufficient, however. Think of the following example: You create a list of pages which use a certain template. You want to show the value of the first parameter each page uses when calling that template. This can easily be done with the include feature of DPL. If you now wanted the output to be sorted by the value of that parameter DPL could not help because it had to analyse all articles before finding those parameter values.

But there is another way: Create a sortable wiki table (using the table option of DPL with 'class=sortable') and you can click on the column headings to sort your output accordingly. However, the initial order shown in that table will still be the order in which DPL parsed the wiki pages (usually an alphabetic order of the page names).

Using a handful of javascript lines you can sort a wikitable on pageLoad by any column. You must use an extension like Javascript extension or find some other way to insert that javascript code AT THE END of your page : 

 sortables_init();
 // sort the first sortable table; change [0] to sort other tables.
 tab = document.getElementsByTagName("table")[0];
 // sort by the first column; change [0] to sort by other columns.
 hdr = tab.getElementsByTagName("th")[0];
 // get the sort button link
 lnk = hdr.getElementsByTagName("a")[0];
 ts_resortTable(lnk);

The wikibits.js usually is called at the end of a page and performs sortables_init(). If we call it ourselves it will not recognize this and therefore it will add its sort link buttons a second time (which looks quite funny...). You can teach wikibits.js to be aware of initialized sortable tables by adding the following if-statement around the line where it inserts the href for the sort button (near line 550 in MW 1.13): 

 if (cell.innerHTML.indexOf("sortheader") < 0) { ... place the original code line here ... }



ordermethod

ordermethod Determines what criterium (resp. criteria) is (resp. are) used to order the list.

Syntax:

ordermethod=method1,method2,... means ordered by method1 first, then by method2, etc. (like the ORDER clause in SQL)

methodN can be one of the following single tokens:

categoryadd
outputs list based on most recent addition to the first category (requires to include one category and one only using 'category' parameter)
counter
outputs list based on the number of times the page has been viewed (by ~popularity)
size
outputs list based on the size of the article (bytes of wiki text)
firstedit
outputs list based on first edit to the pages (creation)
lastedit
outputs list based on most recent edit to the pages
pagetouched
outputs list based on 'page_touched' timestamp. Read comment on page_touched field in Page_table to see the difference from most recent edit by an author.
pagesel
outputs list based on the names of the reference pages which are used in the selection of a linksfrom or linksto statement. pagesel only makes sense if there is more than one page mentioned in the linksfrom or linksto condition.
title
outputs list sorted by article (prefix +) title — (default)
titlewithoutnamespace
outputs list sorted by the article name regardless of namespace

methodN can also be one of the following token combinations (see also headingmode option):

category,firstedit
outputs list sorted by category, then by first edit
category,lastedit
outputs list sorted by category, then by last edit within a category
category,pagetouched
outputs list sorted by category, then by pagetouched
category,sortkey
user,firstedit
outputs list sorted by user, then by firstedit by the user
user,lastedit
outputs list sorted by user, then by lastedit by the user

Example: 

<DPL>
  category=Africa
  ordermethod=lastedit
</DPL>

This list will output pages that have [[Category:Africa]] showing most recently edited articles at the top.

order

order Controls the sort direction of the list.

Example:

order=orderdirection

orderdirection can be one of:

  • descending — outputs list from most recent to least recent
  • ascending — outputs list from least recent to most recent — (default)

Example: 

<DPL>
  category    = Africa
  ordermethod = lastedit
  order       = ascending
  addeditdate = true
</DPL>

This list will output pages that have [[Category:Africa]] shown ordered from oldest to newest. In addition the edit date will be presented with each article.


ordercollation

ordercollation Allow individual collations, make case insensitive sorting possible

Example:

ordercollation=latin1_german_ci

You may want to try latin1_swedish_ci or other collation mapping table names as well.

If you use a name for the first time you should make sure that it is correctly spelt. Otherwise you will see a SQL error message.

For case insensitivity during the selection of articles, see ignorecase.

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