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General coding guidelines

Language

British English is preferred for user-facing text; this text should also be marked for translation (using the django.utils.translation.gettext function and {% translate %} template tag, for example). However, identifiers within code should use American English if the British or international spelling would conflict with built-in language keywords; for example, CSS code should consistently use the spelling color to avoid inconsistencies like background-color: $colour-red. American English is also the preferred spelling style when writing documentation. Learn more about our documentation writing style in .

File names

Where practical, try to adhere to the existing convention of file names within the folder where added.

Examples:

Django templates - lower_snake_case.html
Documentation - lower_snake_case.md

Naming conventions

Use `classname` in Python / HTML template tag variables

classname is preferred for any API / interface or Django template variables that need to output an HTML class.

Django template tag

Example template tag definition

@register.inclusion_tag("wagtailadmin/shared/dialog/dialog_toggle.html")
def dialog_toggle(dialog_id, classname="", text=None):
    return {
        "classname": classname,
        "text": text,
    }

Example template

{% comment "text/markdown" %}

    Variables accepted by this template:

    - `classname` - {string?} if present, adds classname to button
    - `dialog_id` - {string} unique id to use to reference the modal which will be triggered

{% endcomment %}

<button type="button" class="{{ classname }}" data-a11y-dialog-show="{{ dialog_id }}">
    {{ text }}
</button>

Example usage

{% dialog_toggle classname='button button-primary' %}

Python / Django class driven content

class Panel:
    def __init__(self, heading="", classname="", help_text="", base_form_class=None):
        self.heading = heading
        self.classname = classname

Details

Convention	Usage
`classname`	✅ Preferred for any new code.
`class`	✳️ Only if used as part of a generic `attrs`-like dict; however avoid due to conflicts with Python `class` keyword.
`classnames`	❌ Avoid for new code.
`class_name`	❌ Avoid for new code.
`class_names`	❌ Avoid for new code.
`className`	❌ Avoid for new code.
`classNames`	❌ Avoid for new code.

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