102 lines
4.6 KiB
Plaintext
102 lines
4.6 KiB
Plaintext
caption: link
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created: 20131024141900000
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modified: 20231113093304323
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tags: Widgets
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title: LinkWidget
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type: text/vnd.tiddlywiki
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The `link` widget generates links to tiddlers. (Use the HTML `<a>` element to generate external links).
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! Content and Attributes
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The content of the link widget is rendered within the `<a>` tag representing the link. If the content is empty then the title of the target tiddler is rendered as the default, for example:
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* `<$link/>` is equivalent to `<$link to=<<currentTiddler>>><$view field="title"/></$link>`
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* `<$link to="HelloThere"/>` is equivalent to `<$link to="HelloThere">HelloThere</$link>`
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|!Attribute |!Description |
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|to |The title of the target tiddler for the link (defaults to the [[current tiddler|Current Tiddler]]) |
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|toAnchor |<<.from-version "5.3.2">> Optional id of the anchor for [[Block Level Links in WikiText]] |
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|aria-label |Optional accessibility label |
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|tooltip |Optional tooltip WikiText |
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|tabindex |Optional numeric [[tabindex|https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/tabIndex]] |
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|draggable |"yes" to enable the link to be draggable (defaults to "yes") |
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|tag |Optional tag to override the default "a" element |
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|class|Optional CSS classes //in addition to// the default classes (see below)|
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|overrideClass|<<.from-version "5.1.16">> Optional CSS classes //instead of// the default classes |
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|data-* |<<.from-version "5.3.2">> Optional [[data attributes|https://developer.mozilla.org/en-US/docs/Learn/HTML/Howto/Use_data_attributes]] to be assigned to the HTML element |
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|style.* |<<.from-version "5.3.2">> Optional [[CSS properties|https://developer.mozilla.org/en-US/docs/Web/CSS/Reference]] to be assigned to the HTML element |
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The draggable functionality is equivalent to using the DraggableWidget with the ''tiddler'' attribute set to the link target.
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The default value of the tooltip attribute is supplied by the <<.vlink tv-wikilink-tooltip>> variable.
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This means that you can control the text of a link tooltip in several ways:
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```
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<$link to="HelloThere" tooltip="Custom tooltip">Link 1</$link>
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<$link to="HelloThere" tooltip="Another tooltip">{{$:/core/icon}}</$link>
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<$set name="tv-wikilink-tooltip" value="I'm a link to {{!!title}}">
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<$link to="HelloThere">Link 2</$link>
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</$set>
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```
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Renders as:
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<$link to="HelloThere" tooltip="Custom tooltip">Link 1</$link>
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<$link to="HelloThere" tooltip="Another tooltip">{{$:/core/icon}}</$link>
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<$set name="tv-wikilink-tooltip" value="I'm a link to {{!!title}}">
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<$link to="HelloThere">Link 2</$link>
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</$set>
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Note that the tooltip is rendered with the current tiddler set to the target of the link.
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A useful convention is to set the tooltip like this:
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```
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\define tv-wikilink-tooltip()
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<$transclude field="tooltip"><$transclude field="title"/></$transclude>
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\end
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```
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This causes the tooltip to be the ''tooltip'' field of the target tiddler. If the field isn't present, then the title is used instead.
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! CSS Classes
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The link widget automatically determines and applies the following classes to links:
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* `tc-tiddlylink` - applied to all links
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* `tc-tiddlylink-external` - applied to external, non-tiddler links
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* `tc-tiddlylink-internal` - applied to tiddler links
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* `tc-tiddlylink-missing` - applied to tiddler links where the target tiddler doesn't exist
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* `tc-tiddlylink-resolves` - applied to tiddler links when the target tiddler does exist
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Use the `class` attribute to specify additional css classes, or `overrideClass` to apply only that but not the above defaults, e.g. when used in a LinkCatcherWidget:
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<<wikitext-example-without-html """*<$link class="example">Here</$link> the `example` class is added.
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*<$link overrideClass="example">Here</$link> only the `example` class applies.
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*<$link overrideClass="">Here</$link> no class is set.""">>
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! `href` generation
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The following process is used to generate the `href` attribute of the generated HTML `<a>` element:
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# If <<.vlink tv-get-export-link>> is defined it is invoked to convert the target tiddler title to the `href` value
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#* In practice, only a [[JavaScript macro|Macros]] can be used
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# <<.from-version "5.1.15">> If <<.vlink tv-filter-export-link>> is defined it is interpreted as a filter that converts the target tiddler title to the `href` value
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# If <<.vlink tv-wikilink-template>> is defined it is treated as a specialised macro body that can perform limited conversion of the target tiddler title to the `href` value
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# Otherwise, the target tiddler title is URI encoded to create the `href`
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! Configuration variables
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* <<.vlink tv-wikilinks>>
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* <<.vlink tv-filter-export-link>>
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* <<.vlink tv-wikilink-template>>
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* <<.vlink tv-wikilink-tooltip>>
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* <<.vlink tv-get-export-link>>
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