gitlab-org--gitlab-foss/doc/development/fe_guide/haml.md

stage	group	info
none	unassigned	To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments

HAML

HAML is the Ruby on Rails template language that GitLab uses.

HAML and our Pajamas Design System

GitLab UI is a Vue component library that conforms to the Pajamas design system. Many of these components rely on JavaScript and therefore can only be used in Vue.

However, some of the simpler components (such as buttons, checkboxes, or form inputs) can be used in HAML:

• Some of the Pajamas components are available as a ViewComponent. Use these when possible.
• If no ViewComponent exists, why not go ahead and create it? Talk to the Foundations team if you need help.
• As a fallback, this can be done by applying the correct CSS classes to the elements.
• A custom Ruby on Rails form builder exists to help use GitLab UI components in HAML forms.

Use the GitLab UI form builder

To use the GitLab UI form builder:

1. Change form_for to gitlab_ui_form_for.
2. Change f.check_box to f.gitlab_ui_checkbox_component.
3. Remove f.label and instead pass the label as the second argument in f.gitlab_ui_checkbox_component.

For example:

• Before:

  = form_for @group do |f|
    .form-group.gl-mb-3
      .gl-form-checkbox.custom-control.custom-checkbox
        = f.check_box :prevent_sharing_groups_outside_hierarchy, disabled: !can_change_prevent_sharing_groups_outside_hierarchy?(@group), class: 'custom-control-input'
        = f.label :prevent_sharing_groups_outside_hierarchy, class: 'custom-control-label' do
          %span
            = s_('GroupSettings|Prevent members from sending invitations to groups outside of %{group} and its subgroups.').html_safe % { group: link_to_group(@group) }
          %p.help-text= prevent_sharing_groups_outside_hierarchy_help_text(@group)
  
    .form-group.gl-mb-3
      .gl-form-checkbox.custom-control.custom-checkbox
        = f.check_box :lfs_enabled, checked: @group.lfs_enabled?, class: 'custom-control-input'
        = f.label :lfs_enabled, class: 'custom-control-label' do
          %span
            = _('Allow projects within this group to use Git LFS')
            = link_to sprite_icon('question-o'), help_page_path('topics/git/lfs/index')
          %p.help-text= _('This setting can be overridden in each project.')
  

• After:

  = gitlab_ui_form_for @group do |f|
    .form-group.gl-mb-3
      = f.gitlab_ui_checkbox_component :prevent_sharing_groups_outside_hierarchy,
          s_('GroupSettings|Prevent members from sending invitations to groups outside of %{group} and its subgroups.').html_safe % { group: link_to_group(@group) },
          help_text: prevent_sharing_groups_outside_hierarchy_help_text(@group),
          checkbox_options: { disabled: !can_change_prevent_sharing_groups_outside_hierarchy?(@group) }
  
    .form-group.gl-mb-3
      = f.gitlab_ui_checkbox_component :lfs_enabled, checkbox_options: { checked: @group.lfs_enabled? } do |c|
        = c.label do
          = _('Allow projects within this group to use Git LFS')
          = link_to sprite_icon('question-o'), help_page_path('topics/git/lfs/index')
        = c.help_text do
          = _('This setting can be overridden in each project.')
  

Available components

When using the GitLab UI form builder, the following components are available for use in HAML.

NOTE: Currently only the listed components are available but more components are planned.

gitlab_ui_checkbox_component

GitLab UI Docs

Arguments

Argument	Description	Type	Required (default value)
method	Attribute on the object passed to gitlab_ui_form_for.	Symbol	true
label	Checkbox label. label slot can be used instead of this argument if HTML is needed.	String	false (nil)
help_text	Help text displayed below the checkbox. help_text slot can be used instead of this argument if HTML is needed.	String	false (nil)
checkbox_options	Options that are passed to Rails check_box method.	Hash	false ({})
checked_value	Value when checkbox is checked.	String	false ('1')
unchecked_value	Value when checkbox is unchecked.	String	false ('0')
label_options	Options that are passed to Rails label method.	Hash	false ({})

Slots

This component supports ViewComponent slots.

Slot	Description
label	Checkbox label content. This slot can be used instead of the label argument.
help_text	Help text content displayed below the checkbox. This slot can be used instead of the help_text argument.

gitlab_ui_radio_component

GitLab UI Docs

Arguments

Argument	Description	Type	Required (default value)
method	Attribute on the object passed to gitlab_ui_form_for.	Symbol	true
value	The value of the radio tag.	Symbol	true
label	Radio label. label slot can be used instead of this argument if HTML content is needed inside the label.	String	false (nil)
help_text	Help text displayed below the radio button. help_text slot can be used instead of this argument if HTML content is needed inside the help text.	String	false (nil)
radio_options	Options that are passed to Rails radio_button method.	Hash	false ({})
label_options	Options that are passed to Rails label method.	Hash	false ({})

Slots

This component supports ViewComponent slots.

Slot	Description
label	Checkbox label content. This slot can be used instead of the label argument.
help_text	Help text content displayed below the radio button. This slot can be used instead of the help_text argument.