book

Drupal 8: Enterprise Web Development

Name: Drupal 8: Enterprise Web Development
ISBN: 9781787283190

by Nick Abbott, Richard Jones, Matt Glaman, Chaz Chumley

December 2016

Beginner to intermediate

1005 pages

21h 54m

English

Packt Publishing

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Drupal 8: Enterprise Web Development
Table of Contents
Drupal 8: Enterprise Web Development
Credits
Preface
What this learning path covers
What you need for this learning path
Who this learning path is for
Reader feedback
Customer support
Downloading the example codeErrataPiracyQuestions
1. Module 1

1. Introduction
What is Drupal?Dynamic web pages – a brief historyEnter the databaseA worldwide communityThe success of DrupalMultiple systems integrationTechnical debtDeveloper knowledgeModularityThere's a module for that
Some Drupal history
Language choiceIs Drupal a framework or platform?Embracing other communities' frameworksHow an open source community works
Summary
2. Installation
System requirementsPHPWeb server optionsDatabase optionsBrowser options
Setting up a development environment
Free cloud hosting
Acquia Dev Desktop
Installing Drupal 8
Configuring your Drupal 8 site
Troubleshooting your installation
Memory settingsPHP timeouts
Trusted host patterns
Summary
3. Basic Concepts
ModulesCore and contrib modulesWhere the core modules liveWhere your extension modules should liveAn example community moduleEvaluating new modulesDocumentationModule versions
Entities, nodes, and fields
EntitiesNodesNode typesFieldsAdding new fieldsField typesGeneralNumberReferenceTextField settingsField widgetsForm displayManaging the form displayManaging field displayDrupal 8 core entity types
Taxonomy
Fixed terms or tags
Blocks
Views
Users, roles, and permissions
Themes
Administration themesBase themes and subthemes
Hooks
Summary
4. Getting Started with the UI
The Drupal 8 user interfaceLogging outLogging inFront pageRepositioning the tray
Responsiveness
Administration themeContextual links
Quick content creation
Listing content
Revisiting the home page
Structure
Block layoutComment typesContact formsPersonal contact formContent typesCustomizing a content typeCustomizing fieldsCustomizing content entry screensCustomizing the displayDisplay modesView modesForm modesMenusTaxonomyViews
Configuration
Appearance
People
Reports
Extend
Summary
5. Basic Content
Introducing your site-building scenarioTypes of contentPagesArticlesClientsServicesTestimonialsFAQsContact informationSEO considerations
Basic pages
Creating a new pageTitleBodyBody field summaryRich text toolbarDefault HTML restrictionsFull HTMLRestricted HTMLAdding a page to the main navigation menuNodes and unique IDsAdding more pages
Articles
Creating a new articleFront page promotionAdjusting the settings for a content typeDisabling front page promotionAdjusting comment settingsDisabling future commentsNo retrospective actionRetrospective actionThreadingShow reply form on the same page as commentsPreview comments before postingRemoving all comments and the ability to comment
Summary
6. Structure
Managing menusReorganizing menu itemsEditing menu items
Managing taxonomy
Creating a new Taxonomy vocabularyRe-ordering Taxonomy termsApply a taxonomy vocabulary to content typesAdjusting the order of fields when editingCategorizing contentViewing categorized contentSegregating article types using taxonomyCreating another taxonomy vocabulary
Working with the Views module
Creating a Views-powered News pageView wizardCreating a new viewRenaming a displayLive previewContent settingsPage settingsFiltering to News onlyCreating a blog page
Working with Views blocks
Creating blocks using ViewsPlacing the News blocksBlock positionBlock visibility
Summary
7. Advanced Content
Field types
Extending content types
Adjusting field settingsForcing the Article type field to be mandatoryAdjusting edit form settingsPlaceholder textCustomizing view modesRemoving the labels and fields from the displayControlling image size using styles
Creating new content types
Creating the Client content typeInherited fieldsAdding a logo fieldTokensImage accessibilityLinking clients to their web sitesProviding an e-mail address for a ClientProviding a telephone number for a ClientMarking a Client as high profileAttaching taxonomyReusing fieldsAdjusting field display settingsAdding a sorted client list to the Clients pageViews sort criteriaAdding a pager to your viewCreating the Service content typeEnabling the linking of Services to ClientsDisplaying services listing using ViewsCreating the Testimonial content type
Listing testimonials with a view
Creating a grouped viewThe FAQ content typeContent type settingsField settingsDisplay settingsCreating the simple FAQ pageAdding interactive querying to a view
Summary
8. Configuration
People – Account settingsContact settingsAnonymous usersAdministrator roleRegistration and cancellationEnable password strength indicatorAccount cancelation behaviorNotification e-mail addressEmails
System
Site informationCron
Content authoring
Text formats and editorsAvailable filters
User interface
Shortcuts
Development
PerformanceCachingClear cacheBandwidth optimizationLogging and errorsMaintenance mode
Configuration synchronization
Media
File systemImage stylesImage toolkit
Search and metadata
Indexing progressIndexing throttleDefault indexing settingsLoggingSearch pagesURL Aliases
Regional and language
Regional settingsLocaleTime zonesDate and time formats
Web services
RSS publishing
Summary
9. Users and Access Control
Users and roles
Permissions
Typical rolesA typical scenarioCreating user accountsUser ID 1Editing accountsTaking control of the People page
Summary
10. Optional Features
Activity Tracker
Aggregator
Ban
Book
Forum
ContainersForum settingsHot topicsTopics per pageDefault orderForum permissionsContributing Forum topics
Responsive image
Statistics
Syslog
Core (experimental), Multilingual, and Web services
Summary
11. Reports
Accessing reports
Available updates
Recent log messages
Log detailsFiltering log messagesClearing logsLog messages and performance
Field list
Status report
Top 'access denied' errors
Top 'page not found' errors
Top search phrases
Views plugins
Summary
12. Extending Drupal
Installing a module
Improving FAQs
Downloading the Views Accordion moduleInstalling the module through the UI
Pathauto and Token
Generating paths from patternsPathauto settings
Summary
13. Theming Drupal
What is a theme?
Terminology
Themes included in Drupal 8
Accessible via the UIBartikSevenStarkBase themesClassyStable
Setting the active theme
Common settings
Toggle display
Theme regions
Color scheme
Setting the admin theme
Advanced themes from the Drupal community
Installing a new theme
Custom themes
Base themes and subthemes
Summary
14. Getting Support
What is open source?
The Drupal community
Drupal.org
Issue queues
Reporting a bug or requesting support
The Drupal security team
api.drupal.org
IRC chat
The Drupal Association
DrupalCon
DrupalCamps
Specialist Drupal companies
Training
Certification
Summary
2. Module 2
1. Up and Running with Drupal 8
Introduction
Installing Drupal
Getting readyHow to do it…How it works…There's more…Creating a database user and a databaseDatabase prefixesDownloading and installing with DrushSecurity updatesSee also
Using a distribution
How to do it…How it works…There's more…MakefilesInstalling with DrushSee also…
Installing modules and themes
Getting readyHow to do it…How it works…Discovering modules and themesModule installationTheme installationThere's more…Installing a module with DrushUninstalling a moduleSee also…
Using multisites in Drupal 8
Getting readyHow to do it…How it works…There's more…Security concernsSee also…
Tools for setting up an environment
Getting readyHow to do it…How it works…There's more…Acquia Dev DesktopXAMPP + BitnamiKalaboxSee also…
Running Simpletest and PHPUnit
Getting readyHow to do it…How it works…There's more…Is run-tests a shell script?Running Simpletest without Drupal installedRunning specific testsDrupalCISee also…
2. The Content Authoring Experience
Introduction
Configuring the WYSIWYG editor
Getting readyHow to do it…How it works…There's more…Filter moduleCKEditor pluginsSee also
Adding and editing content
Getting readyHow to do it…How it works…There's moreSave as draftPathautoBulk moderationSee also
Creating a menu and linking content
Getting readyHow to do it…How it works…There's more…Managing a contents menu link from its form
Providing inline editing
How to do it…How it works…
Creating a custom content type
How to do it…How it works…
Applying new Drupal 8 core field types
Getting readyHow to do it…LinkThe e-mail fieldThe Telephone fieldDateThe Entity ReferenceHow it works…There's more…Upcoming updatesViews and Entity ReferenceSee also
Customizing the form display of a node
How to do it…How it works…There's more…Managing form display modesProgrammatically providing a default to hidden form itemsSee also
Customizing the display output of a node
How to do it…How it works…
3. Displaying Content through Views
Introduction
Listing content
Getting readyHow to do it…How it works…There's more…Views in Drupal Core InitiativeViews and displaysFormat style plugins: style and rowUsing the Embed displaySee also
Editing the default admin interfaces
How to do it…How it works…There's more…Exposed versus non-exposedFilter identifiersOverriding routes with Views
Creating a block from a View
Getting readyHow to do it…How it works…There's more…Exposed forms as blocksSee also
Utilizing dynamic arguments
How to do it…How it works…There's more…Previewing with contextual filtersDisplaying as a tab on the user pageAltering the page titleValidationMultiple and exclusion
Adding a relationship in a View
How to do it…How it works…There's more…Relationships provided by entity reference fieldsRelationships provided through custom codeUsing Aggregation and views.
Providing an Entity Reference result View
How to do it…How it works…There's more…View argumentsSee also
4. Extending Drupal
Introduction
Creating a module
How to do it...How it works...There's more...Module namespacesModule discovery locationsDefining a package groupModule dependenciesSpecifying the module's versionSee also...
Defining a custom page
Getting readyHow to do it…How it works…There's more…Parameters in routesValidating parameters in routesRoute requirementsProviding dynamic routesAltering existing routesSee also
Defining permissions
Getting readyHow to do it…How it works...There's more…Restrict access flag for permissionsDefining permissions programmaticallyChecking whether a user has permissions
Providing the configuration on installation or update
Getting readyHow to do it…How it works…There's more…Configuration subdirectoriesModifying the existing configuration on installationSee also
Using Features 2.x
How to do it...How it works…There's more…Suggested feature modulesFeatures bundlesManaging the configuration state of FeaturesSee also
5. Frontend for the Win
Introduction
Creating a custom theme based on Classy
How to do it...How it works...There's more...Theme screenshotsThemes, logos, and faviconsBase themes and shared resourcesCKEditor stylesheetsSee also
Using the new asset management system
Getting readyHow to do it...How it works...There's more…CSS groupsLibrary asset optionsLibrary dependenciesOverriding and extending other librariesUsing a CDN or external resource as a libraryManipulating libraries from hooksPlacing JavaScript in the headerSee also
Twig templating
Getting readyHow to do it...How it works...There's more…Security firstTheme hook suggestionsDebugging template file selection and hook suggestionsThe Twig logic and operatorsSee also
Using the Breakpoint module
Getting readyHow to do it...How it works...There's more...Caveat for providing breakpoints from themesAccessing breakpoints programmaticallyMultipliersSee also
Using the Responsive Image module
Getting readyHow to do it...How it works...There's more...Performance first deliveryRemoving picturefill polyfillSee also
6. Creating Forms with the Form API
Introduction
Creating a form
Getting readyHow to do it…How it works…There's more…Form element definitionsThe form stateThe form cacheSee also
Using new HTML5 elements
Getting readyHow to do it…How it works…There's more…Specific element propertiesCreating new elementsSee also
Validating form data
Getting readyHow to do it…How it works…There's more…Multiple validation handlersAccessing multidimensional array valuesElement validation methods
Processing submitted form data
Getting readyHow to do it…How it works…There's more…Multiple submit handlersSee also
Altering other forms
Getting readyHow to do it…How it works…There's more…Adding additional validate handlersAdding additional submit handlers
7. Plug and Play with Plugins
Introduction
Creating blocks using plugins
Getting readyHow to do it…How it works...There's more...Altering blocksBlock settings formsDefining access to a blockSee also
Creating a custom field type
Getting readyHow to do it…How it works…There's more…Altering field typesDefining whether a field is emptySee also
Creating a custom field widget
Getting readyHow to do it…How it works...There's moreField widget settings and summarySee also
Creating a custom field formatter
Getting readyHow to do it…How it works…There's moreFormatter settings and summarySee also
Creating a custom plugin type
Getting readyHow to do it…How it works…There's moreSpecifying an alter hookUsing a cache backendAccessing plugins through the managerSee also
8. Multilingual and Internationalization
Introduction
Translating administrative interfaces
Getting readyHow to do it…How it works…There's more…Manually installing language filesChecking translation statusExporting translationsInterface translation permissionsUsing interface translation to customize default English stringsInterface text language detectionProviding translations for a custom moduleSee also
Translating configuration
Getting readyHow to do it…How it works…There's more…Altering configuration translation info definitionsTranslating viewsSee also
Translating content
Getting readyHow to do it…How it worksThere's moreFlagging translations as outdatedTranslating content linksDefining translation handlers for entitiesSee also
Creating multilingual views
Getting readyHow to do it…How it works…There's more…Translating exposed form items and filtersTranslating display and row format itemsTranslating page display menu itemsSee also
9. Configuration Management – Deploying in Drupal 8
Introduction
Importing and exporting configurations
Getting readyHow to do it…How it works…There's more…Configuration dependenciesSaving to a YAML file for a module's configuration installationConfiguration schemasSee also
Synchronizing site configurations
Getting readyHow to do it…How it works…There's more…Universally Unique IdentifierA synchronization folderInstalling a configuration from a new site
Using command-line workflow processes
Getting ready…How to do it…How it works…There's more…Drush config-pullUsing the Drupal ConsoleEditing the configuration from the command lineExporting a single configuration itemUsing version control and command-line workflowSee also
Using the filesystem for configuration storage
How to do it…How it works…There's more…Deprecated for Drupal 9See also
10. The Entity API
Introduction
Creating a configuration entity type
Getting readyHow to do it…How it worksThere's more…Available data types for schema definitionsSee also
Creating a content entity type
Getting readyHow to do it…How it works…There's more…Using the AdminHtmlRouteProvider providerSimplifying base field definitions using the Entity moduleThe entity type's admin permissionMaking the collection route a local task tabSee also
Creating a bundle for a content entity type
Getting readyHow to do it…How it works…There's more…Provide action links for adding new bundlesSee also
Implementing custom access control for an entity
Getting readyHow to do it…How it works…There's more…Controlling access to entity fieldsSee also
Providing a custom storage handler
Getting readyHow to do it…How it works…There's more…Utilizing a different storage backend for an entitySee also
Creating a route provider
Getting readyHow to do it…How it works…There's more…The Entity API module provides add generationProviding a collection routeSee also
11. Off the Drupalicon Island
Introduction
Implementing and using a third-party JavaScript library
Getting readyHow to do it…How it works…See also
Implementing and using a third-party CSS library
Getting readyHow to do it…How it works…See also
Implementing and using a third-party PHP library
Getting readyHow to do it…How it works…See also
Using Composer manager
Getting readyHow to do it…How it works…There's more…Updating the Stack/Cors recipeSee also
12. Web Services
Introduction
Enabling RESTful interfaces
Getting readyHow to do it…How it works…There's more…Soft dependency on the HAL moduleRestResource plugin to expose data through RESTful Web ServicesThe REST UI moduleRate limiting your APISee also
Using GET to retrieve data
Getting readyHow to do it…How it works…There's more…Using _format instead of the Accept headerSee also
Using POST to create data
Getting readyHow to do it…How it works…There's more…Understanding available _links requirementsWorking with imagesUsing Cross-Site Request Forgery tokensSee also
Using PATCH to update data
Getting readyHow to do it…How it works…See also
Using Views to provide custom data sources
How to do it…How it works…There's more…Controlling the key name in JSON outputControlling access of RESTful ViewsAdd a URL formatter for the image fieldSee also
Authentication
Getting readyHow to do it…There's more…Authentication provider servicesPage cache request policies and authenticated web service requestsIP Authentication ProviderSee also
13. The Drupal CLI
Introduction
Rebuilding cache in Console or Drush
How to do it…How it works…
Using Drush to interact with the database
Getting readyHow to do it…How it works…There's more…Using gzip with sql-dumpUsing Console to interact with the databaseSee also
Using Drush to manage users
How to do it…How it works…There's more…Advanced user-login use casesUsing Drupal Console
Scaffolding code through Console
Getting readyHow to do it…How it works…
Making a Drush command
Getting readyHow to do it…How it works…There's more…Specifying the level of Drupal's bootstrapSee also
Making a Console command
Getting readyHow to do it…How it works…There's more…Using a Console command to create entitiesSee also
3. Module 3
1. Setting Up Our Development Environment
Installing an AMP (Apache, MySQL, PHP) stackIntroducing MAMPDownloading MAMPInstalling MAMP
A quick tour of MAMP PRO
General settings for MAMP PROHost settings
Installing Drupal 8
Downloading Drupal 8Creating our document rootCreating our host entryCreating a new database for DrupalUsing phpMyAdminCompleting Drupal 8 installationChoosing a languageChoosing a profileVerifying requirementsDatabase configurationConfiguring the siteSite maintenance accountRegional settingsUpdate notifications
Reviewing the new admin interface
Exploring the admin menuPreviewing the interfaceExploring Drupal 8 folder structureThe core folderThe modules folderThe sites folderThe themes folder
Using the project files
Downloading and extracting the exercise filesDatabase backupExport settingsDatabase restoreUsing Google Chrome to inspect elements
Summary
2. Theme Administration
What is a theme?
Exploring the Appearance interface
Drupal's core themes
BartikSevenStarkClassy
Theme states
Installed themesUninstalled themesDefault theme
Installing and uninstalling themes
Step one – installing a themeStep two – uninstalling a theme
Theme settings
Toggling the display of page elementsLogo image settingsShortcut icon settings
Theme-specific settings
Using prebuilt themes
Installing a new themeInstalling from a URLUploading a module or theme archive to install
Manually installing a theme
Cleaning up our themes folder
Managing content with blocks
Exploring the Block layoutBlocks and regionsDemonstrating block regionsPlacing blocks into regionsConfiguring a blockManaging the titleManaging visibility settingsContent types restrictionPage restrictionRole restrictionCreating a custom block
Managing custom blocks
Exploring the custom block libraryExploring block typesManaging fieldsManaging display
Summary
3. Dissecting a Theme
Setting up a local development environmentManaging sites/default folder permissionsConfiguring settings.local.phpDisabling CSS and JS aggregationDisabling render and page cacheDisabling test modules and themes
Default themes versus custom themes
Folder structure and naming conventions
Managing configuration in Drupal 8
Reviewing the new info.yml file
MetadataLibrariesDefining a libraryOverriding librariesExtending librariesAttaching a libraryUsing Twig to attach a libraryUsing the preprocess functions to attach a libraryRegions
The role of templates in Drupal
How templates workWhere to find templates
Creating our first basic theme
Step One – creating a new folderStep two – create an info fileStep three – copy core templatesStep four – include a screenshotStep five – installing our themeStep six – Welcome to Twig
Introducing Twig
Enabling Twig debugTwig fundamentalsCommenting variablesSetting variablesPrinting variablesDumping variablesFiltersControl structures
Template variables
The role of the theme file in Drupal
Preprocessors and hooksOverriding variables
Summary
4. Getting Started – Creating Themes
Starter themes
Creating a Bootstrap starter
Understanding grids and columnsSetting up a theme folderAdding a screenshotConfiguring our themeInstalling our themeWorking with librariesAdding assetsCreating a library referenceIncluding our library
Creating a Jumbotron
Step one – managing block contentStep two – hiding the page title
Rethinking our layout
Adding regionsManaging the block content
Using Twig templates
Creating a homepage templateCreating region templatesWorking with the Theme layerUsing Devel to print variablesPrinting variables from a function
Subthemes
Adding the theme folderIncluding a screenshotConfiguring our themeInstalling our theme
Touring Classy
Overriding a library
Summary
5. Prepping Our Project
Walking through the design mockupHomepage layoutDefining homepage regions and user interactionBasic page layoutDefining interior regionsLanding page layoutBlog detail layoutContact pageSearch results
Restoring our database snapshot
Creating a custom theme
Setting up theme foldersAdding a screenshotCreating our configuration fileInstalling our themeSetting up our regionsSetting up our assetsAdding additional assetsHandling default files
Summary
6. Theming Our Homepage
Creating our HTML wrapperIntroducing web fonts
Creating our homepage
Using page templatesWorking with static content
Implementing our Header Top region
Creating our Social Icons blockInstalling Font Awesome libraryRefactoring Header Top region
Implementing our Header region
Adding a logoEnabling Site brandingPrinting our Header regionCreating Block templatesImplementing our search form blockPlacing our search form blockCreating a search form block templateAdding custom JavaScriptCreating an input element templateWorking with menusCreating a menu templateCreating System Menu block templateCreating a sticky header
Implementing our Headline Region
Creating our Headline View and BlockAdding our Headlines BlockPrinting our Headline regionConfiguring FlexSlider libraryAttaching a library using TwigEnable FlexSliderImplementing ParallaxAdding a scroll effectEnabling the scroll scriptAttaching ScrollTo library using Twig
Implementing our Before Content region
Creating our Services blockCreating our Features blockRefactoring Before Content region
Implementing the footer
Creating our custom blocksRefactoring our main footerFooter firstFooter secondFooter thirdFooter bottom leftFooter bottom right
Summary
7. Theming Our Interior Page
Reviewing the About Us mockup
Creating our interior page template
Adding our Global Header
Implementing our page title
Working with static HTMLAdding new regionsReassigning the Page title blockPrinting the Title Bar regionCreating a block template
Implementing our main page structure
Creating a Node template
Implementing our Team members section
Prepping our Team Member ViewCreating our Team Member ViewManaging our Team Members listing blockFormatting Views with CSSAdding CSS classes to ViewsUsing Twig variables to rewrite field contentRearranging View fieldsAdding a View headerRefactoring the After Content region
Adding our global footer
Fixing JavaScript errors
Summary
8. Theming Our Blog Listing Page
Reviewing the Blog Listing mockup
Creating our blog listing
Adding a new display modeManaging the displayEnabling fieldsField label visibilityFormatting fields
Creating a Post Listing view
Using Content Display modes with views
Managing our Post Listing block
Implementing our Node template
Adding CSS classes to TwigWorking with content variablesUsing the without filterCreating our post image sliderWorking with field templatesAdding the Owl Carousel libraryUsing Twig filters for datesPrinting title and teaserCreating our post metadataField templates and taxonomyHandling comments in Drupal 8
Creating a theme file
Printing our comment countAdding a read more link
Creating a Categories block
Managing our Categories block
Implementing responsive sidebars
Theming a Block template
Drupal Views and Twig templates
Managing popular versus recent content
Creating our recent posts blockCreating our popular posts blockSorting views by comment countAttaching a view to the footerManaging our popular posts blockUsing Twig and Bootstrap tabsRecent Posts Twig templatePopular Posts Twig templateUsing Views-view templatesCreating a Post Teaser Twig template
Adding the About Us block
Implementing the About Us template
Summary
9. Theming Our Blog Detail Page
Reviewing the Blog detail mockup
Previewing our Blog detail page
Creating a Post Full template
Altering fields
Working with comments
Introducing Comment typesReviewing Default Comment type fields and displayEnabling Post Type Comments fieldCreating a Field Comments templateTheming the Comment threadEnabling user photos for Comment threadsCleaning up the User Picture fieldCreating the Field User Picture templateDate and time formats
Implementing social sharing capabilities
The Add This buttonsCreating a library entryAttaching the library to our Blog detail pageDisplaying buttons
Summary
10. Theming Our Contact Page
Reviewing the contact page mockup
Introducing contact forms
Editing a contact formManaging form fieldsManaging form display
Contact page layout
Adding a Callout block
Creating the Callout block template
Integrating Google Maps into our contact page
Configure Google MapsCreating our Google Maps blockCreating the Callout Map template
Summary
11. Theming Our Search Results
Reviewing the Search Results mockup
Looking at default Search results
Introducing core search
Indexing contentEditing search pagesDisabling search pages
Working with Search Results templates
Modifying the item list templateCleaning up each result
Search alternatives
Search APIInstalling the Search APIAdding a serverAdding an indexConfiguring bundlesAdding fields to our indexCreating a Search Results ViewUsing the Search index view modeAdding filter criteriaPlacing our exposed search formAdding our placeholder attributeUsing our search formDisplaying the number of search resultsAdding a No Results message
Summary
12. Tips, Tricks, and Where to Go from Here
Working with Local TasksTheming local tasksWorking with Status messagesAdding the Highlighted regionTheming our Status message block
Reusing Twig templates
Using extends to share layoutsWorking with Twig blocks
Where do we go from here?
Summary
A. Biblography
Index

Content preview from Drupal 8: Enterprise Web Development

Theme states

One of the advantages of Drupal is the ability to have multiple themes available to use at any time, and as we discussed earlier, Drupal provides us with three themes to start with. However, it is important to differentiate between installed, uninstalled, and default. We can consider these as the theme's states.

Installed themes

Installed themes are always located in the Installed themes section of the Appearance admin and are available for Drupal to use for either the frontend or backend of the CMS. However, there can only be one theme set as the default at any given time. We can see a list of installed themes, as shown in the following image:

Uninstalled themes

Uninstalled theme(s) are themes that Drupal is aware of within the core ...

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