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* Add usemap attribute to image macro Allow for a usemap attribute on the $image macro call which is passed through to the resulting img tag. This makes the use of HTML image maps [1] possible. [1]: <https://www.w3schools.com/html/html_images_imagemap.asp> * Document new usemap attribute in ImageWidget * Update version docs --------- Co-authored-by: Jeremy Ruston <jeremy@jermolene.com>
44 lines
2.0 KiB
Plaintext
44 lines
2.0 KiB
Plaintext
caption: image
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created: 20140416160234142
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modified: 20231121114351165
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tags: Widgets
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title: ImageWidget
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type: text/vnd.tiddlywiki
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! Introduction
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The image widget displays images that can be specified as a remote URL or the title of a local tiddler containing the image.
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! Content and Attributes
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Any content of the `<$image>` widget is ignored.
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|!Attribute |!Description |
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|source |The URL of the image, or the title of an image tiddler |
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|width |The width of the image |
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|height |The height of the image |
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|tooltip |The tooltip to be displayed over the image |
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|alt |The alternative text to be associated with the image |
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|class |CSS classes to be assigned to the `<img>` element |
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|loading|<<.from-version "5.2.3">>Optional. Set to `lazy` to enable lazy loading of images loaded from an external URI |
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|usemap|<<.from-version "5.3.2">>Optional usemap attribute to be assigned to the `<img>` element for use with HTML image maps |
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The width and the height can be specified as pixel values (eg "23" or "23px") or percentages (eg "23%"). They are both optional; if not provided the browser will use CSS rules to size the image.
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! Image Status Classes
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<<from-version "5.2.2">> The following CSS classes are automatically added to the `<img>` element to indicate the status of the image. Note that only one of these classes will be added at the same time.
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|''tc-image-loading'' |When the image is being loaded |
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|''tc-image-loaded'' |The image has been loaded successfully |
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|''tc-image-error'' |The image could not be loaded |
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! External Images and the ''_canonical_uri'' field
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When used to display tiddler-based images, the image widget operates in two distinct modes:
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* If the ''_canonical_uri'' field is present then it is used as the ''src'' attribute of the generated `<img>` element and the ''text'' field is ignored
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* Without the ''_canonical_uri'' field, the image widget generates an `<img>` element that embeds the image data directly using a `data:` URI.
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See ExternalImages for more details.
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