Breadcrumbs

Breadcrumbs help to expose the hierarchy, not the particular clicks of a user. Its logic is more clear and most of it is only in one Mixin, not scattered throughout the code.

Table of Contents

• Design
  • Explorer screens
  • Non-explorer screens
• Usage

Design

• this design follows Patternfly guidelines
• First, show the path from the navigation (E.g.: Compute > Infrastructure > Providers)
• Only breadcrumbs which lead somewhere should be clickable (last breadcrumb in the menu, etc.)
• The end of the breadcrumb string should represent the page a user is currently viewing
• When using breadcrumbs, be sure to include them on every page throughout the application.
  • Exception: when content is shown on in a separate window without navigation (ex. reports), breadcrumbs are not required

Examples

1) Explorer screens

• Show the tree path in the breadcrumbs includes accordion header

  Default

  

  Detail

  

  Detail action

  

  Action

  

  Tagging/Ownership/etc.

  • Show the item breadcrumb only when there is only one item

  One item

  

  More items

  

  Ancestry

  

  • only Services. Services are missing hiearchy in the tree (because of performance).

  Filters

  • are not a part of the hiearchy

  

2) Non-explorer screens

Default

• There could be different header on the landing page, should be included in the menu part (however two controllers are using dynamic headers: hosts, clusters.)

Detail

Detail Action/Action

Tagging/Ownership/etc.

• Show item breadcrumb only when there is only one item

One item

More items

Usage

A controller should include Breadcrumbs mixins:

include Mixins::BreadcrumbMixin

and then it has to define a new method:

def breadcrumbs_options

• which returns a hash with variables depended on the controller and its type:

{
:breadcrumbs    => ..., 
:include_record => ..., 
:record_info    => ...,
:record_title   => ...,
}

All controllers should contain:

{
:breadcrumbs => [
  { :title => ... , :url => ?, :key => ? }
  ]
}

• which sets a way in the main navigation menu:

• :title - title of the breadcrumb, eg. _('Cloud Providers)'

• :url - url, eg. controller_url

A breadcrumb can have also:

• :key - using in tree views, key for the item, eg. root
• :action - additional action for using with the key, eg. accordion_select

Variables

All variables are optional.

:record_info => @ems

• some controllers use different variables to store information about a current item. Most of them are using @record, which is a default variable. If not, then you have to manually set which variable is used.

:record_title => :key

• Method which stores a title of the variable set in the record_info ( :title = @ems.key )

Explorer controllers

:include_record => true

• when the title of the shown item is missing, e.g. in edit actions. Mostly used when trees do not contain all nodes.

Schema of breadcrumbs flow