ActionMenu

Description

ActionMenu is used for actions, navigation, to display secondary options, or single/multi select lists. They appear when users interact with buttons, actions, or other controls.

The only allowed elements for the Item components are: :a, :button, and :clipboard-copy. The default is :button.

Select variants

While ActionMenus default to a list of buttons that can link to other pages, copy text to the clipboard, etc, they also support single and multiple select variants. The single select variant allows a single item to be "selected" (i.e. marked "active") when clicked, which will cause a check mark to appear to the left of the item text. When the multiple select variant is chosen, multiple items may be selected and check marks will appear next to each selected item.

Use the select_variant: option to control which variant the ActionMenu uses. For more information, see the documentation on supported arguments below.

Dynamic labels

When using the single select variant, an optional label indicating the selected item can be displayed inside the menu button. Dynamic labels can also be prefixed with custom text.

Pass dynamic_label: true to enable dynamic label behavior, and pass dynamic_label_prefix: "<string>" to set a custom prefix. For more information, see the documentation on supported arguments below.

ActionMenus as form inputs

When using either the single or multiple select variants, ActionMenus can be used as form inputs. They behave very similarly to how HTML <select> boxes behave, and play nicely with Rails' built-in form mechanisms. Pass arguments via the form_arguments: argument, including the Rails form builder object and the name of the field:

<% form_with(url: update_merge_strategy_path) do |f| %>
  <%= render(Primer::Alpha::ActionMenu.new(form_arguments: { builder: f, name: "merge_strategy" })) do |menu| %>
    <% menu.with_item(label: "Fast forward", data: { value: "fast_forward" }) %>
    <% menu.with_item(label: "Recursive", data: { value: "recursive" }) %>
    <% menu.with_item(label: "Ours", data: { value: "ours" }) %>
    <% menu.with_item(label: "Theirs", data: { value: "theirs" }) %>
  <% end %>
<% end %>

The value of the data: { value: ... } argument is sent to the server on submit, keyed using the name provided above (eg. "merge_strategy"). If no value is provided for an item, the value of that item is the item's label. Here's the corresponding MergeStrategyController that might be written to handle the form above:

class MergeStrategyController < ApplicationController
  def update
    puts "You chose #{merge_strategy_params[:merge_strategy]}"
  end

  private

  def merge_strategy_params
    params.permit(:merge_strategy)
  end
end

ActionMenu items that submit forms

Whereas ActionMenu items normally permit navigation via <a> tags which make HTTP get requests, ActionMenu items also permit navigation via POST requests. To enable this behavior, include the href: argument as normal, but also pass the form_arguments: argument to the appropriate item:

<%= render(Primer::Alpha::ActionMenu.new) do |menu| %>
  <% menu.with_item(
    label: "Repository",
    href: update_repo_grouping_path,
    form_arguments: {
      method: :post,
      name: "group_by",
      value: "repository"
    }
  ) %>
<% end %>

Make sure to specify method: :post, as the default is :get. When clicked, the list item will submit a POST request to the URL passed in the href: argument, including a parameter named "group_by" with a value of "repository". If no value is given, the name, eg. "group_by", will be used as the value.

It is possible to include multiple fields on submit. Instead of passing the name: and value: arguments, pass an array via the inputs: argument:

<%= render(Primer::Alpha::ActionMenu.new) do |menu| %>
  <% menu.with_show_button { "Group By" } %>
  <% menu.with_item(
    label: "Repository",
    href: update_repo_grouping_path,
    form_arguments: {
      method: :post,
      inputs: [{
        name: "group_by",
        value: "repository"
      }, {
        name: "some_other_field",
        value: "some value",
      }],
    }
  ) %>
<% end %>

Form arguments

The following table summarizes the arguments allowed in the form_arguments: hash mentioned above.

The elements of the inputs: array will be emitted as HTML <input type="hidden"> elements.

JavaScript API

ActionMenus render an <action-menu> custom element that exposes behavior to the client.

Query methods

• getItemById(itemId: string): Element: Returns the item's HTML <li> element. The return value can be passed as the item argument to the other methods listed below.
• isItemChecked(item: Element): boolean: Returns true if the item is checked, false otherwise.
• isItemHidden(item: Element): boolean: Returns true if the item is hidden, false otherwise.
• isItemDisabled(item: Element): boolean: Returns true if the item is disabled, false otherwise.

NOTE: Item IDs are special values provided by the user that are attached to ActionMenu items as the data-item-id HTML attribute. Item IDs can be provided by passing an item_id: attribute when adding items to the list, eg:

<%= render(Primer::Alpha::ActionMenu.new) do |menu| %>
  <% menu.with_item(item_id: "my-id") %>
<% end %>

State methods

• showItem(item: Element): Shows the item, i.e. makes it visible.
• hideItem(item: Element): Hides the item, i.e. makes it invisible.
• enableItem(item: Element): Enables the item, i.e. makes it clickable by the mouse and keyboard.
• disableItem(item: Element): Disables the item, i.e. makes it unclickable by the mouse and keyboard.
• checkItem(item: Element): Checks the item. Only has an effect in single- and multi-select modes.
• uncheckItem(item: Element): Unchecks the item. Only has an effect in multi-select mode, since items cannot be unchecked in single-select mode.

Events

The <action-menu> element fires an itemActivated event whenever an item is activated (eg. clicked) via the mouse or keyboard.

document.querySelector("action-menu").addEventListener("itemActivated", (event: CustomEvent<ItemActivatedEvent>) => {
  event.detail.item     // Element: the <li> item that was activated
  event.detail.checked  // boolean: whether or not the result of the activation checked the item
})

Accessibility

The action for the menu item needs to be on the element with role="menuitem". Semantics are removed for everything nested inside of it. When a menu item is selected, the menu will close immediately.

Additional information around the keyboard functionality and implementation can be found on the WAI-ARIA Authoring Practices.

Arguments

Slots

show_button

Button to activate the menu.

items

Adds a new item to the list.

Methods

list

Returns the value of attribute list.

preload

Returns the value of attribute preload.

preload?

Returns the value of attribute preload.

with_show_button(system_arguments: Hash)

Button to activate the menu.

Parameters

with_item(system_arguments: Hash)

Adds a new item to the list.

Parameters

with_divider(system_arguments: Hash)

Adds a divider to the list.

Parameters

with_avatar_item(src: String, username: String, full_name: String, full_name_scheme: Symbol, avatar_arguments: Hash, system_arguments: Hash)

Adds an avatar item to the list. Avatar items are a convenient way to accessibly add an item with a leading avatar image.

Parameters

ActionMenu::List

This component is part of Primer::Alpha::ActionMenu and should not be used as a standalone component.

Arguments

Methods

items

Returns the value of attribute items.

ActionMenu::Heading

Heading used to describe groups within an action menu.

ActionMenu::ListWrapper

This component is part of Primer::Alpha::ActionMenu and should not be used as a standalone component.

Arguments

Slots

heading

Heading text rendered above the list of items.

items

Items. Items can be individual items, avatar items, or dividers. See the documentation for #with_item, #with_divider, and #with_avatar_item respectively for more information.

ActionMenu::Group

This component is part of Primer::Alpha::ActionMenu and should not be used as a standalone component.

Arguments

Slots

heading

Heading text rendered above the list of items.

items

Items. Items can be individual items, avatar items, or dividers. See the documentation for #with_item, #with_divider, and #with_avatar_item respectively for more information.

Methods

with_heading(system_arguments: Hash)

Heading text rendered above the list of items.

Parameters