Help:What links here/ja

ページに置かれたツールボックスに「」 というリンクがあり、バックリンクとも呼びます.

概要
 は、表示しているページに対してリンクを張っている同じサイト上の関連ページを一覧表示する機能で、対象の名前空間は広く拾う場合と、特定の名前空間から抽出する場合があります. この情報を実際に理解するには、任意のページで  リンクを選択してください. 指定したページにリンクしているページや、当該ページを埋め込んでいるページが列挙されます. 一覧の並び順はページ ID 順、つまりページの作成日時順です.

この情報は テーブルおよび  テーブルに基づいて作成されます. また指定したページが埋めこまれた先との関係はMediaWiki:Istemplateの内容 (「参照読み込み」または「呼び出し」による) で示します. その場合は指定のページとはリンクの関係ではありません. 一例はm:Query#backlinksを参照してください.

特定の記事のリンク元一覧は以下のように便利に使えます.


 * そのページがどのくらい閲覧されているか、おおよその指標になる. リンク元が多いページは閲覧数が多いと推定され、秀逸であると考えることができる.  リンク元が少ないページは閲覧数が低い可能性がある.
 * 特定の記事の主題が不明確な場合、リンク元の記事一覧を参照するとわかりやすい可能性がある. たとえば誰野誰彦というスタブ記事で、記述が生没年月日のみのページがあるとすると、リンク元のリストからオリンピックで金メダルを獲得した人だとわかる可能性がある.
 * 的確な曖昧さ回避に誘導できる.

この機能は存在しないページも対象にします（リンクのみ存在する可能性があるため、作成すると便利です）. ボタンは壊れたリンクをたどった先の編集ページにもあります. そこでたとえば映画作品の記事から俳優にリンクがあると、もし俳優その人の記事はなくても、出演作品の記事が見つかる可能性があります.

直接、の一覧を作成するには以下の方法が含まれます. w:Special:Whatlinkshere/John Smith resulting in w:Special:Whatlinkshere/John_Smith.

Limitations and workarounds
Not listed are:


 * subpages that just have an automatic link to a page
 * links in edit summaries

Also listed are:


 * pages with #ifexist applied to the given page (see )

In the case of links to sections or other anchors, the precise target is not shown. Also, "" cannot list the backlinks of a specific section/anchor only. These features are provided by Linksearch after adding a "hidden external link".

Alternatives:

If this is desired, the section can be split off. The content can still be shown on the original page, by transcluding the new page. Alternatively, or in preparaton of splitting off, instead of creating a link to a section one can create a link to a page redirecting to the section. The list of backlinks of the full page is now sorted by exact target, though not listing the names of the target sections but the names of the redirect pages. This also makes it easier to keep the links working when changing the name of a section: only the target of the redirect page has to changed, not the source pages of the links. Note that the redirect message is at the top of the whole page, so typically not visible at the target position. This may be an advantage (the disadvantage of the redirect message cluttering the target is minimal) or a disadvantage. To see the name of the page without scrolling up, note that the browser usually shows it in the window title at the very top, while the address bar shows the name of the redirect page with the name of the section on the target page. See also Help:Section linking and redirects (this link itself is also an example of what has been described).

Also note that if a page's links change due to a change in the template, the backlinks for that page are not updated immediately, but via the job queue.

リダイレクト
The backlinks feature shows which backlinks are redirects.

The backlinks of the redirect are also shown indented under the redirect, and if they include a redirect, the backlinks of that also (not more).

This makes it a useful tool for finding double redirects, which do not work, and, except in special applications (see below) can better be replaced by redirects to the final target.

For listing just the redirects to e.g. w:Wikipedia:Be bold, use https://en.wikipedia.org/w/api.php?action=query&list=backlinks&bltitle=Wikipedia:Be%20bold&blfilterredir=redirects&bllimit=500 or http://tools.wikimedia.de/~tangotango/whatredirectshere.php?lang=nl&title=Wikipedia%3ABe+bold&subdom=en&domain=.wikipedia.org

Cases of inclusion
Whether there is a link from A to C is relevant for backlinks as well as Related changes. If C does not exist, only backlinks are applicable.


 * Inclusion is listed as such.
 * A link from A to C counts as such even if the link is not explicit in the wikitext of A, but due to the inclusion of B, which links to C.
 * If A calls B and there is a link in B to C within noinclude tags then B links to C, but A does not.
 * If A calls B and there is a link in B to C within includeonly tags then A links to C, but B does not.
 * If A calls B and B links to a page C that depends on a variable or parameter, then:
 * The question whether A links to C depends on the value of the variable on page A, or the parameter with which A calls B.
 * The question whether B links to C depends on the value of the variable on page B; in the case of a parameter, considered from page B, the page may e.g. not call a valid page name (because it calls one with a name with braces), so B does not link to any valid C, or a name depending on the default value of the parameter.

Thus a link from A to C may be due to the inclusion of B, even when B, considered by itself, does not link to C. Thus, to find out what templates cause pages to link to C, it is not sufficient to check for templates in the backlinks of C.

If some pages link to C due to the inclusion of B, it is more convenient if B is in the list of backlinks of C. One can assure this by putting an appropriate example of usage of B on page B, inside noinclude tags (B includes B, but without recursion).

Otherwise a page like B, which causes pages which include B to link to C, can only be found by looking for pages which directly or indirectly are included in these backlink pages of C.

例:


 * Template:H:f calls Template:h:f . Considered by itself that is Template:H:f Template Related chages of Template:H:f, What links to Template:H:f Template
 * This page Help:What links here links through Template:H:f to Template:H:f Help Related changes of Help:What links here, What links to Template:H:f Help. This page is therefore a backlink of the latter, but Template:H:f is not listed.

Even without a template name depending on a variable or parameter, if page A links to page C due to the inclusion of template B1 which redirects to B2, which links to C, A is in the list of backlinks of C but B1 is not.

Summarizing, for the purpose of backlinks and Related changes, A links to C if there is, in that order, a chain of template calls, a single redirect, template calls, a single redirect, etc., template calls, and a chain of redirects.

If a page is conditionally embedded through #if, #ifeq, #ifexist, #ifexpr, or #switch, it is counted as embedded, even if the condition is not fulfilled

If on page A the name of an embedded page is time-dependent, e.g., currently giving , the "" list of one of the possibly embedded pages shows page A: the current one, or, depending on caching issues, perhaps an older one.

Thus, although the same functionality is obtained with, these methods differ in whether the seven templates all count as embedded, or just one.

In the case of an image, using it in a page is listed in the third section of the image description page, but not in "" of that page

User styles
The page body has selector body.page-Special_Whatlinkshere, so we can e.g. use the CSS  to number the backlinks.

Order; query
"" sorts by page id, i.e., by date of creation of the page.

Comparison with m:Query#backlinks and m:Query#embeddedin:

Compare Special:Whatlinkshere/Template:T with http://meta.wikimedia.org/w/query.php?what=backlinks|embeddedin&titles=template:t&bllimit=500&eilimit=500&blfilter=all&eifilter=all

Differences demonstrated:


 * Query sorts by function first (backlinks and inclusions), then by page id, "what links here" sorts by page id.
 * Query distinguishes between B being only included in A, and B also being linked from A.
 * Query does not indicate which backlinks are redirects, and does not include their backlinks.
 * Query provides page ids.

Another difference:


 * Query allows restriction to a specified namespace.

using Extension:DynamicPageList, produces backlinks sorted in alphabetic order. Other sorting options are also available.

In-page list of backlinks
You can display all the links to a page directly within a page by embedding the page "Special:Whatlinkshere"; see.

This can also be done using any of the extensions.

Two extensions, and, can be used to make more detailed lists of incoming links, grouped by the specific relationship between the two pages, but only for relationships that are encoded via those extensions.

Finding external links to a page
For a given source wiki we can find the external links to any URL with Special:Linksearch (if installed). Thus, in particular, we can find e.g. pages on the English Wikipedia having an external link to this page or even to an old version, an edit or history page, etc. (provided that the parameter "title" comes first): .

There is no such feature for interwiki links. This may be a reason to prefer external link style.

関連項目

 * Special:Mostlinked - shows the number of links
 * Special:Mostlinkedtemplates - shows the number of pages in which each template is transcluded, not counting transclusions through redirects