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61 lines
2.5 KiB
Plaintext
61 lines
2.5 KiB
Plaintext
created: 20141129210304238
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modified: 20150220161405000
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tags: [[Transclusion in WikiText]]
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title: Transclusion with Templates
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caption: With Templates
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! Introduction
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In [[Transclusion Basic Usage]] we have seen how to include the content of a tiddler A into a tiddler B. Now suppose that tiddler A contains:
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```
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@@background-color:yellow;
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Hello, my title is {{!!title}}
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@@
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```
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This makes tiddler A display its title with a yellow background (see [[Styles and Classes in WikiText]] to learn about CSS style). Imagine that you want to display the title in the same way in tiddler B. But you don't want to copy/paste the style instructions, because you might want to change the background colour later and you want to keep it consistent among tiddlers. This looks like a typical case of transclusion, so let's try to transclude tiddler A in tiddler B the usual way with ``{{A}}``. You should see the following content in tiddler B:
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<<<
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@@background-color:yellow;
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Hello, my title is A
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@@
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<<<
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The style is applied as expected, but the title is wrong: we want ``{{!!title}}`` to refer to the target tiddler B, and not the source tiddler A.
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The solution is to use a //template//. In this case, the source tiddler A is called the [[TemplateTiddler|TemplateTiddlers]], and it is //applied// to tiddler B using the notation ``{{||A}}``. The difference is that any TextReference which does not refer explicitly to a specific tiddler is applied to the [[current tiddler|Current Tiddler]], that is, the target tiddler. As a result, tiddler B now looks as expected:
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<<<
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@@background-color:yellow;
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Hello, my title is B
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@@
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<<<
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! Usage
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Transcluding via a template is like applying a mask: assuming that the source tiddler contains generic references (like eye holes in a mask), these will be replaced with the target tiddlers values (like the eyes of the person who wears the mask).
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A template can be applied to any tiddler, not necessarily the current one. This is achieved using the full notation ``{{<target>||<template>}}``. The default ``<target>`` is the [[current tiddler|Current Tiddler]] (this is what we used in the above example).
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! Examples
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!! A predefined template to render tags nicely
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You can apply the system template ``$:/core/ui/TagTemplate`` to a tag in order to see it as a tag pill with a drop-down menu:
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```
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{{Transclusion||$:/core/ui/TagTemplate}}
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```
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is rendered as {{Transclusion||$:/core/ui/TagTemplate}}
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See also:
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* [[Transclusion in WikiText]]
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* [[Transclusion Basic Usage]]
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* TextReference
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* TemplateTiddlers
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* TranscludeWidget
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* [[Current Tiddler]]
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