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wagtail/docs/contributing/general_guidelines.md
LB Johnston eb808116f0 Development docs - refine classname convention
- Update template example to be in a more logical order & use the correct template syntax
- Update `class_name` as no longer preferred as we have adopted a normalised approach for icon
2022-12-09 20:13:33 +10:00

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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`.
### Latin phrases and abbreviations
Try to avoid Latin phrases (such as `ergo` or `de facto`) and abbreviations (such as `i.e.` or `e.g.`), and use common English phrases instead. Alternatively, find a simpler way to communicate the concept or idea to the reader. The exception is `etc.` which can be used when space is limited.
Examples:
| Don't use this | Use this instead |
| -------------- | -------------------- |
| e.g. | for example, such as |
| i.e. | that is |
| viz. | namely |
| ergo | therefore |
## 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
```python
@register.inclusion_tag("wagtailadmin/shared/dialog/dialog_toggle.html")
def dialog_toggle(dialog_id, classname="", text=None):
return {
"classname": classname,
"text": text,
}
```
Example template
```html+django
{% 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
```html+django
{% dialog_toggle classname='button button-primary' %}
```
### Python / Django class driven content
```python
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. |