wagtail/docs/reference/pages/panels.md

(editing-api)=

# Panel types

## Built-in Fields and Choosers

Django's field types are automatically recognised and provided with an appropriate widget for input. Just define that field the normal Django way and pass the field name into
[`FieldPanel`](wagtail.admin.panels.FieldPanel) when defining your panels. Wagtail will take care of the rest.

Here are some Wagtail-specific types that you might include as fields in your models.

```{eval-rst}
.. module:: wagtail.admin.panels
   :noindex:
```

(field_panel)=

### FieldPanel

```{eval-rst}
.. class:: FieldPanel(field_name, classname=None, widget=None, heading='', disable_comments=False, permission=None)

    This is the panel used for basic Django field types.

    .. attribute:: FieldPanel.field_name

        This is the name of the class property used in your model definition.

    .. attribute:: FieldPanel.classname

        This is a string of optional CSS classes given to the panel which are used in formatting and scripted interactivity.

        The CSS class ``title`` can be used to give the field a larger text size, suitable for representing page titles and section headings.

    .. attribute:: FieldPanel.widget (optional)

        This parameter allows you to specify a :doc:`Django form widget <django:ref/forms/widgets>` to use instead of the default widget for this field type.

    .. attribute:: FieldPanel.heading (optional)

        This allows you to override the heading for the panel, which will otherwise be set automatically using the form field's label (taken in turn from a model field's ``verbose_name``).

    .. attribute:: FieldPanel.help_text (optional)

        Help text to be displayed against the field. This takes precedence over any help text set on the model field.

    .. attribute:: FieldPanel.disable_comments (optional)

        This allows you to prevent a field level comment button showing for this panel if set to ``True`` (see :ref:`commenting`).

    .. attribute:: FieldPanel.permission (optional)

        Allows a field to be selectively shown to users with sufficient permission. Accepts a permission codename such as ``'myapp.change_blog_category'`` - if the logged-in user does not have that permission, the field will be omitted from the form. See Django's documentation on :ref:`custom permissions <django:custom-permissions>` for details on how to set permissions up; alternatively, if you want to set a field as only available to superusers, you can use any arbitrary string (such as ``'superuser'``) as the codename, since superusers automatically pass all permission tests.
```

### StreamFieldPanel

```{eval-rst}
.. class:: StreamFieldPanel(field_name, classname=None, widget=None)

    Deprecated; use ``FieldPanel`` instead.

    .. versionchanged:: 3.0

       ``StreamFieldPanel`` is no longer required for ``StreamField``.
```

### MultiFieldPanel

```{eval-rst}
.. class:: MultiFieldPanel(children, heading="", classname=None)

    This panel condenses several :class:`~wagtail.admin.panels.FieldPanel` s or choosers, from a ``list`` or ``tuple``, under a single ``heading`` string.

    .. attribute:: MultiFieldPanel.children

        A ``list`` or ``tuple`` of child panels

    .. attribute:: MultiFieldPanel.heading

        A heading for the fields

    .. attribute:: MultiFieldPanel.help_text

        Help text to be displayed against the panel.
```

### InlinePanel

```{eval-rst}
.. class:: InlinePanel(relation_name, panels=None, classname='', heading='', label='', help_text='', min_num=None, max_num=None)

    This panel allows for the creation of a "cluster" of related objects over a join to a separate model, such as a list of related links or slides to an image carousel.
```

This is a powerful but complex feature which will take some space to cover, so we'll skip over it for now. For a full explanation on the usage of `InlinePanel`, see {ref}`inline_panels`.

#### Collapsing InlinePanels to save space

Note that you can use `classname="collapsed"` to load the panel collapsed under its heading in order to save space in the Wagtail admin.

### FieldRowPanel

```{eval-rst}
.. class:: FieldRowPanel(children, classname=None)

    This panel creates a columnar layout in the editing interface, where each of the child Panels appears alongside each other rather than below.

    Use of FieldRowPanel particularly helps reduce the "snow-blindness" effect of seeing so many fields on the page, for complex models. It also improves the perceived association between fields of a similar nature. For example if you created a model representing an "Event" which had a starting date and ending date, it may be intuitive to find the start and end date on the same "row".

    .. attribute:: FieldRowPanel.children

        A ``list`` or ``tuple`` of child panels to display on the row

    .. attribute:: FieldRowPanel.classname

        A class to apply to the FieldRowPanel as a whole

    .. attribute:: FieldRowPanel.help_text

        Help text to be displayed against the panel.
```

### HelpPanel

```{eval-rst}
.. class:: HelpPanel(content='', template='wagtailadmin/panels/help_panel.html', heading='', classname='')

    .. attribute:: HelpPanel.content

        HTML string that gets displayed in the panel.

    .. attribute:: HelpPanel.template

        Path to a template rendering the full panel HTML.

    .. attribute:: HelpPanel.heading

        A heading for the help content.

    .. attribute:: HelpPanel.classname

        String of CSS classes given to the panel which are used in formatting and scripted interactivity.
```

### PageChooserPanel

```{eval-rst}
.. class:: PageChooserPanel(field_name, page_type=None, can_choose_root=False)

    You can explicitly link :class:`~wagtail.models.Page`-derived models together using the :class:`~wagtail.models.Page` model and ``PageChooserPanel``.

    .. code-block:: python

        from wagtail.models import Page
        from wagtail.admin.panels import PageChooserPanel


        class BookPage(Page):
            related_page = models.ForeignKey(
                'wagtailcore.Page',
                null=True,
                blank=True,
                on_delete=models.SET_NULL,
                related_name='+',
            )

            content_panels = Page.content_panels + [
                PageChooserPanel('related_page', 'demo.PublisherPage'),
            ]

    ``PageChooserPanel`` takes one required argument, the field name. Optionally, specifying a page type (in the form of an ``"appname.modelname"`` string) will filter the chooser to display only pages of that type. A list or tuple of page types can also be passed in, to allow choosing a page that matches any of those page types:

    .. code-block:: python

        PageChooserPanel('related_page', ['demo.PublisherPage', 'demo.AuthorPage'])

    Passing ``can_choose_root=True`` will allow the editor to choose the tree root as a page. Normally this would be undesirable, since the tree root is never a usable page, but in some specialised cases it may be appropriate; for example, a page with an automatic "related articles" feed could use a PageChooserPanel to select which subsection articles will be taken from, with the root corresponding to 'everywhere'.

    .. versionchanged:: 3.0

       ``FieldPanel`` now also provides a page chooser interface for foreign keys to page models. ``PageChooserPanel`` is only required when specifying the ``page_type`` or ``can_choose_root`` parameters.
```

### ImageChooserPanel

```{eval-rst}
.. module:: wagtail.images.edit_handlers

.. class:: ImageChooserPanel(field_name)

    Deprecated; use ``FieldPanel`` instead.

    .. versionchanged:: 3.0

       ``ImageChooserPanel`` is no longer required to obtain an image chooser interface.
```

### FormSubmissionsPanel

```{eval-rst}
.. module:: wagtail.contrib.forms.panels

.. class:: FormSubmissionsPanel

    This panel adds a single, read-only section in the edit interface for pages implementing the :class:`~wagtail.contrib.forms.models.AbstractForm` model.
    It includes the number of total submissions for the given form and also a link to the listing of submissions.

    .. code-block:: python

        from wagtail.contrib.forms.models import AbstractForm
        from wagtail.contrib.forms.panels import FormSubmissionsPanel

        class ContactFormPage(AbstractForm):
            content_panels = [
                FormSubmissionsPanel(),
            ]
```

### DocumentChooserPanel

```{eval-rst}
.. module:: wagtail.documents.edit_handlers

.. class:: DocumentChooserPanel(field_name)

    Deprecated; use ``FieldPanel`` instead.

    .. versionchanged:: 3.0

       ``DocumentChooserPanel`` is no longer required to obtain a document chooser interface.
```

### SnippetChooserPanel

```{eval-rst}
.. module:: wagtail.snippets.edit_handlers

.. class:: SnippetChooserPanel(field_name, snippet_type=None)

    Deprecated; use ``FieldPanel`` instead.

    .. versionchanged:: 3.0

       ``SnippetChooserPanel`` is no longer required to obtain a document chooser interface.
```

## Field Customisation

By adding CSS classes to your panel definitions or adding extra parameters to your field definitions, you can control much of how your fields will display in the Wagtail page editing interface. Wagtail's page editing interface takes much of its behaviour from Django's admin, so you may find many options for customisation covered there.
(See [Django model field reference](django:ref/models/fields)).

### Titles

Use `classname="title"` to make Page's built-in title field stand out with more vertical padding.

(collapsible)=

### Collapsible

```{versionchanged} 4.0
All panels are now collapsible by default.
```

Using `classname="collapsed"` will load the editor page with the panel collapsed under its heading.

```python
    content_panels = [
        MultiFieldPanel(
            [
                FieldPanel('cover'),
                FieldPanel('book_file'),
                FieldPanel('publisher'),
            ],
            heading="Collection of Book Fields",
            classname="collapsed"
        ),
    ]
```

### Placeholder Text

By default, Wagtail uses the field's label as placeholder text. To change it, pass to the FieldPanel a widget with a placeholder attribute set to your desired text. You can select widgets from [Django's form widgets](django:ref/forms/widgets), or any of the Wagtail's widgets found in `wagtail.admin.widgets`.

For example, to customise placeholders for a Book model exposed via ModelAdmin:

```python
# models.py
from django import forms            # the default Django widgets live here
from wagtail.admin import widgets   # to use Wagtail's special datetime widget

class Book(models.Model):
    title = models.CharField(max_length=256)
    release_date = models.DateField()
    price = models.DecimalField(max_digits=5, decimal_places=2)

    # you can create them separately
    title_widget = forms.TextInput(
        attrs = {
            'placeholder': 'Enter Full Title'
        }
    )
    # using the correct widget for your field type and desired effect
    date_widget = widgets.AdminDateInput(
        attrs = {
            'placeholder': 'dd-mm-yyyy'
        }
    )

    panels = [
        FieldPanel('title', widget=title_widget), # then add them as a variable
        FieldPanel('release_date', widget=date_widget),
        FieldPanel('price', widget=forms.NumberInput(attrs={'placeholder': 'Retail price on release'})) # or directly inline
    ]
```

### Required Fields

To make input or chooser selection mandatory for a field, add [`blank=False`](django.db.models.Field.blank) to its model definition.

### Hiding Fields

Without a panel definition, a default form field (without label) will be used to represent your fields. If you intend to hide a field on the Wagtail page editor, define the field with [`editable=False`](django.db.models.Field.editable).

(inline_panels)=

## Inline Panels and Model Clusters

The `django-modelcluster` module allows for streamlined relation of extra models to a Wagtail page via a ForeignKey-like relationship called `ParentalKey`. Normally, your related objects "cluster" would need to be created beforehand (or asynchronously) before being linked to a Page; however, objects related to a Wagtail page via `ParentalKey` can be created on-the-fly and saved to a draft revision of a `Page` object.

Let's look at the example of adding related links to a [`Page`](wagtail.models.Page)-derived model. We want to be able to add as many as we like, assign an order, and do all of this without leaving the page editing screen.

```python
from wagtail.models import Orderable, Page
from modelcluster.fields import ParentalKey

# The abstract model for related links, complete with panels
class RelatedLink(models.Model):
    title = models.CharField(max_length=255)
    link_external = models.URLField("External link", blank=True)

    panels = [
        FieldPanel('title'),
        FieldPanel('link_external'),
    ]

    class Meta:
        abstract = True

# The real model which combines the abstract model, an
# Orderable helper class, and what amounts to a ForeignKey link
# to the model we want to add related links to (BookPage)
class BookPageRelatedLinks(Orderable, RelatedLink):
    page = ParentalKey('demo.BookPage', on_delete=models.CASCADE, related_name='related_links')

class BookPage(Page):
    # ...

    content_panels = Page.content_panels + [
        InlinePanel('related_links', heading="Related Links", label="Related link"),
    ]
```

The `RelatedLink` class is a vanilla Django abstract model. The `BookPageRelatedLinks` model extends it with capability for being ordered in the Wagtail interface via the `Orderable` class as well as adding a `page` property which links the model to the `BookPage` model we're adding the related links objects to. Finally, in the panel definitions for `BookPage`, we'll add an [`InlinePanel`](wagtail.admin.panels.InlinePanel) to provide an interface for it all. Let's look again at the parameters that [`InlinePanel`](wagtail.admin.panels.InlinePanel) accepts:

```python
InlinePanel(relation_name, panels=None, heading='', label='', help_text='', min_num=None, max_num=None)
```

The `relation_name` is the `related_name` label given to the cluster's `ParentalKey` relation. You can add the `panels` manually or make them part of the cluster model. `heading` and `help_text` provide a heading and caption, respectively, for the Wagtail editor. `label` sets the text on the add button and child panels, and is used as the heading when `heading` is not present. Finally, `min_num` and `max_num` allow you to set the minimum/maximum number of forms that the user must submit.

For another example of using model clusters, see {ref}`tagging`.

For more on `django-modelcluster`, visit
[the django-modelcluster github project page](https://github.com/wagtail/django-modelcluster)