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* Add new docs page 'Changing rich text representation' describing how to subclass Format to provide a custom image html representation in rich text
58 lines
1.9 KiB
ReStructuredText
58 lines
1.9 KiB
ReStructuredText
.. _changing_rich_text_representation:
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=================================
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Changing rich text representation
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=================================
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The HTML representation of an image in rich text can be customised - for example, to display captions or custom fields.
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To do this requires subclassing ``Format`` (see :ref:`rich_text_image_formats`), and overriding its ``image_to_html`` method.
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You may then register formats of your subclass using ``register_image_format`` as usual.
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.. code-block:: python
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# image_formats.py
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from wagtail.images.formats import Format, register_image_format
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class SubclassedImageFormat(Format):
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def image_to_html(self, image, alt_text, extra_attributes=None):
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custom_html = # the custom HTML representation of your image here
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# in Format, the image's rendition.img_tag(extra_attributes) is used to generate the HTML
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# representation
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return custom_html
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register_image_format(
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SubclassedImageFormat('subclassed_format', 'Subclassed Format', classnames, filter_spec)
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)
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As an example, let's say you want the alt text to be displayed as a caption for the image as well:
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.. code-block:: python
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# image_formats.py
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from django.utils.html import format_html
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from wagtail.images.formats import Format, register_image_format
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class CaptionedImageFormat(Format):
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def image_to_html(self, image, alt_text, extra_attributes=None):
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default_html = super().image_to_html(image, alt_text, extra_attributes)
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return format_html("{}<figcaption>{}</figcaption>", default_html, alt_text)
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register_image_format(
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CaptionedImageFormat('captioned_fullwidth', 'Full width captioned', 'bodytext-image', 'width-750')
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)
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.. note::
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Any custom HTML image features will not be displayed in the Draftail editor, only on the published page.
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