Help:Advanced templates

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Template:Cleanup {{#if: Help|Template:H:h Help|Template:H:h Help}} This page is an extension of Help:Template. It concerns template names, variable names, and parameters depending on a variable or parameter. Note: This document refers to features currently only available in 1.6 and later.

Some described applications of these techniques may be outdated because often applying parser functions is better.

Contents

[edit] A template name or a parameter value depending on a parameter or variable

A template name and a parameter value can both depend on a parameter or variable:

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job video pollution video water current interest rates for home loans in california jarlsburg pirate of the caribbean toy mariah carey new video ionamin loss weight information online 206 car naza metadate drug movie below zero photoshop crack code sitemap philosophical movie quotes questions asked at job interview annuity sales exterior cedar board and batten plywood siding work 25 km around balaklava kid definition what is metal margaret fuller case activation code earth google plus ej banks become a model papercut video riviera hotel las vegas extrait video anneliese van der pol movie rare vhs westerns look into my eyes lyrics by benzino dioses del metal case study, environmental management plan pure teen movies how much will one collection affect my credit upmc job application adobe photoshop elements 2.0 crack jobs in huntsville jobs boston area credit card merchant airline travel price thyroid problem top free go phone ringtone kilometers into miles per hour martin luther king 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line iso image creator free download warwick school district license pennsylvania professional harry potter fanfics live meeting video eyes god movie their watching were pvr 150 personal video recorder hindi funny birthday wishese cards http airline travel discounts airline tickets purchase alaska airline miles new account asian bang gang video http singer yummy jim bowie life in a time line spysweeper serial crack piano performance videos hiring jobs in columbus ohio britney pregnant florida state board of counseling licensure head hilton oceanfront rental full metal alchemist again lirycs trusted investments starter credit cards cape cod vacation rentals free printable greeting cards online citi card payment webster university laptop battery loan borse miu miu car rental companys people falling videos panics videos soapy punishment enemas domain top stock picks car rentals ft lauderdale international airport how can u make money with unicorns in runescape car rental europe prague 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This allows branching depending on variables and parameters. However, using parser functions is more versatile.

Since with the method of this section no conditions such as {{{1}}}<a can be evaluated, and no substrings can be extracted from strings (not even currently with parser functions), etc., this works best if each parameter and variable has only a limited number of possible values. For example {{CURRENTDAYNAME}} has only seven possible values, so all cases can be handled with seven templates; if there are really only two cases, five of the seven could be redirects. On the other hand , {{CURRENTTIME}} has 1440 possible values, so it would be impractical to create a template or even just a redirect for each. 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roper refinancing home mortgage calculator usa company owner visa austin country inns online visa application for uk littlegreenfootballs loews movie theaters nj inspiration new song us bank retirement funds morehead university quotes from disney movies t5 lighting replacing 400w metal halide pacers piston brawl video sitemap cherry bomb bike girls wholesale suppliers jacksonville florida times union adware spy serial crack anarchist cookbook torrent stainless steel manufacturer commercial real estate investing in canada page potomac job corp center romance novels online pop rocks and coke video womens footwear activation key windows 2000 wiener stadtfest free patterns primal fear movie cast see movies online for free attack break movie shark spring juegos infantiles on line iso image creator free download warwick school district license pennsylvania professional harry potter fanfics live meeting video eyes god movie their watching were pvr 150 personal video recorder hindi funny birthday wishese cards http airline travel discounts airline tickets purchase alaska airline miles new account asian bang gang video http singer yummy jim bowie life in a time line spysweeper serial crack piano performance videos hiring jobs in columbus ohio britney pregnant florida state board of counseling licensure head hilton oceanfront rental full metal alchemist again lirycs trusted investments starter credit cards cape cod vacation rentals free printable greeting cards online citi card payment webster university laptop battery loan borse miu miu car rental companys people falling videos panics videos soapy punishment enemas domain top stock picks car rentals ft lauderdale international airport how can u make money with unicorns in runescape car rental europe prague jobs in rumford maine bargain tours and travels us dv visa lottery planes trains automobiles movie control and order stock is the google onlie job a scam pharrell williams frontin video plan b movie diane keaton 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An older method described below is another possibility, see e.g. soviet union cold war pretty guardian sailor moon video berliner liebe cheapest car insurance companies demande de visa uk au maroc domain links mike schneider associated press sara evans suds video resturants london a mortgage broker license axialis iconworkshop 5.0 crack vintage electronic packaging peter russell comedy video advanced office password recovery 3.02 serial key pooped pantie video all video to vcd svcd dvd converter key lime pie recipes sm appliance philippine evening herald classifieds lose to google microsoft game thing friends real ringtones motorola v220 2005 senatu wybory acquisition serial mac satx road runner top sanibel sea song spanish fly legally buy norco without a prescription slim fast medical demonstrative evidence six million dollar man ringtone pipe mitre yolanda adams cleveland indians you make me wanna song lyrics link sysworxx wellbutrin side effects stomach asp split string domain 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Having multiple parameters, which each can have only few values, is more flexible than having the same total number of possibilities in a single parameter.

If a template depends on PAGENAME, then the many possible values need not be a problem: only the pagenames of the pages that call the template apply, and these can be limited.

Branching according to {{{1}}}=a or {{{1}}}≠a is possible, see the section #A parameter name depending on a parameter.

[edit] Examples of pages that call a template with a name depending on a variable

[edit] A variable name depending on a parameter

Example:

{{namespace|4}}, using Template:Namespace, containing

[[:Template:Namespace]]

gives:

Template:Namespace

[edit] A parameter name depending on a parameter

A parameter name in a template call (before "=") can depend on a parameter.

For example, using Template:Timc with Template:Timc: 

*{{t pnd|capital}}
*{{t pnd|country}}
*{{t pnd|something else}}

gives

This applies also for integer parameter names which normally do not require "=", but are now referred to by an expression on the left of "=".

Furthermore, multiple assignments of values to the same parameter in the same template call are allowed and result in the last value being used.

For example, {{t p|country=Belgium|capital=Paris|country=France}} gives "Template:T p".

The following is somewhat obsolete on wikis with the ParserFunctions extension, which allows easier branching.

This can be combined into the following branching technique:

{{tts|first parameter, with fixed name = name of template to be called if the parameter names are not equal | second parameter, with the name depending on parameters and/or variables = name of the template to be called if the parameter names are equal }} with Template:Tts containing {{{{{name of first parameter }}}}} (in this case that name is the empty string).

Thus, while carrying out an action in the case of equality can also be done simply by using a template name equal to the constant (the fixed name above), this technique also allows an action in the case of inequality, without having to cover all alternative values (different from the constant) separately.

Example:

Branching depending on whether a parameter is empty is illustrated with Template:Tcw.

Unfortunately there is no control over the result when the parameter is undefined (as opposed to empty):

Example with an extra parameter:

Consider Template:Timc, which calls Template:Timc: If the first parameter is Not Empty then do the task given by the first parameter with the second, third and fourth parameter as its parameters, else do nothing; if the number of parameters of the task is 0, 1, or 2, ignore the superfluous values.

Using Template:Timc:

  • {{ine|death|[[November 2]], [[2004]]|[[Amsterdam]]|}} gives:

"Template:Ine".

This can be useful inside another template, to avoid the texts "Date of death:" and "place of death:" for a living person.

Also, without a separate template Death, with just the more general Template:Timc:

  • {{ine|p2p1p3|[[November 2]], [[2004]]|Date of death:  |, place of death: [[Amsterdam]]}} gives:

"Template:Ine".

This would not be convenient to use in many template tags, but could be used in an infobox in the form

  • {{ine|p2p1p3|{{{1}}}|Date of death:  |, place of death: {{{2}}}}}

We can apply "subst" to remove a "template layer" for server efficiency. It makes no difference for the editors of the pages that include the infobox, and no difference for the editor who wants to understand all inner workings, but it is more cryptic for the editor of the infobox who wants to use template Ine as black box, without being confronted with the internal coding. It gives:

  • {{call|=p2p1p3|{{{1}}}=x0|1={{{1}}}|2=Date of death:  |3=, place of death: {{{2}}}}}

Applying "subst" again is not possible for the general case where the first parameter may or may not be empty. It would have to be done separately for both cases, thus removing the branching capability.

(Alternatively a separate parameter "dead" with one of the values "dead" and "alive" is used, see e.g. w:en:Template:Infobox President with the auxiliary templates w:en:Template:Infobox President/dead and the empty w:en:Template:Infobox President/alive. A disadvantage is the extra parameter: it has to be specified that a president is alive, it is not sufficient to leave the date of death empty, or that a president is dead, even if a date of death has been specified. An advantage is that backlinks are available, providing not only a list of dead, but also a list of alive presidents for which the infobox is used.)

Similarly, where a table row dealing with a parameter is removed if the parameter is empty:

w:en:Template:If defined call1 calls w:en:Template:Template_call1 with 1={{{2}}} followed by 1{{{1}}}=void; if {{{1}}} is empty then this overwrites the value of 1, so 1=void, otherwise 1={{{2}}}, giving an empty result or {{{{{2}}}|{{{3}}}}}. {{{3}}} is typically the same as {{{1}}} (at least that is the case in all five cases in w:en:Template:Infobox CVG). It avoids e.g. the text "Designer:" if the parameter {{{designer}}} is empty.

More generally, using Template:Timc:

Note that {{NAMESPACE}} produces underscores for spaces, which are not considered equal by the template:

A parameter name in a parameter tag can now depend on a parameter, see Template:T pnd1 and its talk page.

Also a parameter name in a template call can now depend on a variable: {{ns:2}} gives User and {{PUser|User=abc}} gives Template:PUser, hence {{PUser|{{ns:2}}=abc}} gives Template:PUser

Using "subst:" with manual recursion gives a stepwise replacement, useful for analyzing and explaining the working of templates calling other templates. See e.g. Template talk:Lop.

[edit] Including the content of a template in a template or variable name or parameter value

It is now possible to use a template with a name dependent on the content of another template. For example: {{{{tctc}} }}, using Template:Timc and Template:Timc, gives "{{Template:Tctc }}". If there are no parameters, a space is needed between e.g. the two pairs of closing braces.

It is now possible (since about 19 October 2005) to use a variable with a name dependent on the content of a template.

For example: {{CURRENT{{t day}}}} using Template:Timc gives the text {{CURRENTTemplate:T day}}, which is indeed the value of {{CURRENTDAY}}

It is now possible (since about 19 October 2005) to include the content of another template in a parameter value

Examples:

Thus it is now also possible to use a data array as parameter of a template, e.g.:

{{hist5a|x|t data}} using

Template:Timcnl and

Template:Timc gives:

Template:Hist5a

[edit] A template containing an assignment of a parameter value to a parameter name

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in atlanta do gynexin really work labsystems uk inspiration for life moto illimite list of apartment buildings in new york movie branford ct osco pharmacy locations free keypad ringtones nokia red rocket south park video small computer fans url str8 shot free mobile ringtone t voice buy it now sunset boulevard movie reviews easy gourmet recipes school district 281 minnesota mixw crack webmap too many times i can hear you laughing kissing with cum in mouth chumbawumba pamela picture rogers video untitled how could this happen to me video card emachines t2984 feverfew wedding favor ideas online term life quotes classical music downloads kid id bracelet maryland department of motor vehicles isaac mizrahi shoes movie about the scope monkey trial index shockwave video janesville rolex replicas car insurance learner over 25 offline explorer enterprise 4.xx aldi jobs jobs in derby runch case prefabbricate movie phantasm tab u2 vertigo microsoft end user license artificial grapes sepultura map 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The third example shows that a template cannot contain multiple assignments of a parameter value to a parameter name.

[edit] Illustration of the possibilities of template calls and links

[[aTemplate:T complexb|pTemplate:T complexq]]

is the result of [[a{{t complex|c=d|g=h|k=m}}b|p{{t complex|c=d|g=h|k=n}}q]]

where Template:T complex contains:

[[:Template:T complex]]

and Template:T aHelpbdd contains:

[[:Template:T aHelpbdd]]

[[w:en:{{n en|de}}]] gives [[w:en:Template:N en]].

[[{{n en|de}} TV coverage of Wikipedia]] gives [[Template:N en TV coverage of Wikipedia]].

This page can now also be included based on the code "de" using {{:{{n en|de}} TV coverage of Wikipedia}}.


[edit] Producing the value of a parameter whose name depends on the value of another parameter

A parameter value can be used as the name of another parameter, even of the same template. For example, 

{{tvv | parameter=foo | foo=bar}}

using Template:Timc gives Template:Tvv.

For different names the order of the parameters does not matter: 

{{tvv | foo=bar | parameter=foo }}

still gives Template:Tvv.

{{tvv|parameter={{{a|foo}}}|foo=bar}} gives Template:Tvv

However, with substitution it gives the wikitext {{{{{{a|foo}}}}}} rendered as {{{foo}}} .

Also, the technique cannot be applied multiple times. For example, 

{{tvvv | 1=foo | foo=bar | bar=biz}}

using Template:Timc gives Template:Tvvv.

This is e.g. applied in Template:Tiw, which contains a 2D array in the form {{{{{1}}}|{{{2}}}|1-1=a11|..|m-n=amn}}. The first parameter is the name of a template that provides a particular selection and presentation of a selected row of the array, e.g. Template:Tiw, the second parameter (which is the first parameter of the latter template) specifies the row. The latter templates references element j of the row concerned by a tag of the form {{{{{{1}}}-j}}}

The technique can also be used to create control flow structures. 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{{{test{{{test|}}}|{{{then}}}}}}

If test is empty, we expand the empty test parameter, but if it contains data, then after trying to expand a non-existing testdata-parameter, we get the then-parameter value instead. Or a literal {{{then}}}, if there's intentionaly no default value for then, and then is undefined - a crude mechanism to catch errors.

Of course this fails for a say test value it if testit is defined. An example with numerical parameters: 

{{{1{{{1|}}}|okay}}}

For a defined first parameter we expect to get the text okay. But if the value of the first parameter is say 0, and a tenth parameter exists, we get its value {{{10}}} instead of okay.

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{{{then{{{test|}}}|}}}

If test is empty, then we expand the then parameter. But if test contains data, then we try to expand a nonexisting thendata-parameter, finally arriving at its empty default value (= after the second "|" pipe symbol).

Again this fails if the non-existing parameter in fact does exist, e.g. for 

{{{x{{{1|}}}|}}}

with a defined value y for x we expect to get the empty default for a non-existing xy. This fails if {{{xy}}} is defined and non-empty.

An if-then-else could be a combination of those two, as in Template:Timc.

For simple ifdef-cases the best solution is arguably to use it without additional template, e.g. for text relevant only if the third positional parameter is defined use: 

{{{3{{{3|}}}|found third parameter}}}

For the opposite ifndef-case there's unfortunately no similar direct approach. Substitution works for ifdef, but not ifndef or if.

A parameter value can also be used as part of the name of another parameter: 

{{switch
  |{{CURRENTDOW}}
  |case: 1=Mon
  |case: 2=Tue
  |case: 3=Wed
  |case: 4=Thu
  |case: 5=Fri
  |case: 6=Sat
  |case: 0=Sun
  |default=No date
}}

using Template:Timc gives Template:Switch

Using this technique and an auxiliary template, we can produce a function that checks if two parameter values are the same:

Template:Timc, with Template:Timc.

It will return 1 if equal, or null (the empty string) if not.

[edit] See also

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