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Help:Templates

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If you have standard texts you want to include on several pages, the site template feature comes into play.

Contents

Creation

Templates are standard site pages whose content is designed to be transcluded (embedded) inside other pages. Templates follow a convention that the name is prefixed with "Template:", assigning it to that namespace. Therefore you can create them like any other page.

Usage

Templates are pages which can be used in other pages in three ways:

In fact, an ordinary site page can also be used as a template, simply by qualifying the namespace it resides in, so:

If no such namespace exists, the full title is assumed to be a template:

Parameters

Template with numbered parameters
 
'''A little thank you...'''<br />
<small>for {{{1}}}.<br />
hugs, {{{2}}}</small>
You type You get
{{Thankyou|all your hard work|Joe}}
Example sunflower image
A little thank you...
for all your hard work.
hugs, Joe
with named parameters
 
'''A little thank you...'''<br />
<small>for {{{reason}}}.<br />
hugs, {{{signature}}}</small>
You type You get
{{Thankyou
|reason=all your hard work
|signature=Joe}}
Example sunflower image
A little thank you...
for all your hard work.
hugs, Joe

You can define parameters in templates either numbered as {{{1}}} or named {{{param}}}.

Example: You want a little thank you note you can put on the talk page of other users. It will contain a reason and your signature. You could create Template:Thankyou to enter your text, as in the example in the table.

When using the template on a page, you fill in the parameter values, separated by a pipe char (|): {{Thankyou|all your hard work|Joe}}. For named parameters use "name=value" pairs separated by a pipe char: {{Thankyou|reason=all your hard work|signature=Joe}}. The advantage of using named parameters in your template is that they are flexible in order. It also makes the template easier to understand if you have many parameters. If you want to change the order of numbered parameters, you have to mention them explicitly: {{Thankyou|2=Joe|1=all your hard work}}.

You can also provide default values for parameters, i.e. values that are going to be used if no value is provided for a parameter. For example, {{{reason|all your hard work}}} would result in "all your hard work" if no value was provided for the parameter reason.

Control template inclusion

You can control template inclusion by the use of <noinclude> and <includeonly> tags.

Anything between <noinclude> and </noinclude> will be processed and displayed only when the template's page is being viewed directly.

Possible applications are:

The converse is <includeonly>. Text between <includeonly> and </includeonly> will be processed and displayed only when the page is being included. The obvious application is to add all pages containing a given template to a category, without putting the template itself into that category.

Note: when you change the categories applied by a template, the categorization of the pages that use that template may not be updated until some time later: this is handled by the job queue.

Organizing templates

For templates to be effective users need to find them and be able to use them. A simple technique is to include an example on the template page. For example:

<noinclude>
== Usage ==
Allows to establish a link to a subject:
{{NameOfTemplate|Term1+Term2+Term3}}
</noinclude>

Then, an editor can simply copy and paste the example to create a similar page.

See Also

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