- Developing User Guide overview
- Introduction for Developers
- Getting Started Developing AEM Sites - WKND Tutorial
- AEM Core Concepts
- Structure of the AEM Touch-Enabled UI
- Concepts of the AEM Touch-Enabled UI
- AEM Development - Guidelines and Best Practices
- Using Client-Side Libraries
- Developing and Page Diff
- Editor Limitations
- The CSRF Protection Framework
- Data Modeling - David Nuescheler’s Model
- Contributing to AEM
- Security
- Reference Materials
- Create a Fully Featured Website (Classic UI)
- Designs and the Designer (Classic UI)
- Migration to the Touch UI
- Platform
- Sling Cheatsheet
- Using Sling Adapters
- Tag Libraries
- Templates
- Using the Sling Resource Merger in AEM
- Overlays
- Naming Conventions
- Creating a New Granite UI Field Component
- Query Builder
- Tagging
- Customizing Pages shown by the Error Handler
- Custom Node Types
- Adding Fonts for Graphic-Rendering
- Connecting to SQL Databases
- Externalizing URLs
- Creating and Consuming Jobs for Offloading
- Configuring Cookie Usage
- How to programmatically access the AEM JCR
- Integrating Services with the JMX Console
- Developing the Bulk Editor
- Developing Reports
- Components
- Core Components
- Style System
- Components Overview
- AEM Components - The Basics
- Developing AEM Components
- Developing AEM Components - Code Samples
- JSON Exporter for Content Services
- Enabling JSON Export for a Component
- Image Editor
- Decoration Tag
- Using Hide Conditions
- Configuring Multiple In-Place Editors
- Developer Mode
- Testing Your UI
- Components for Content Fragments
- Obtaining Page Information in JSON Format
- Internationalization
- Classic UI Components
- Headful and Headless in AEM
- Headless Experience Management
- Headless and AEM
- Headless Journeys
- Headless Developer Journey
- Understand Headless in AEM
- Learn about CMS Headless Development
- Getting Started with AEM Headless as a Cloud Service
- Path to your first experience using AEM Headless
- How to model your content as AEM Content Models
- How to access your content via AEM delivery APIs
- How to update your content via AEM Assets APIs
- How to put it all together
- How to go live with your headless application
- Optional - How to create single page applications with AEM
- Headless Content Architect Journey
- Headless Developer Journey
- Getting Started Guides
- Content Fragments
- Headless Delivery with Content Fragments and GraphQL
- Working with Content Fragments
- Enable Content Fragment Functionality for your Instance
- Content Fragment Models
- Managing Content Fragments
- Variations - Authoring Fragment Content
- Markdown
- Using Associated Content
- Metadata - Fragment Properties
- Structure Tree
- Preview - JSON Representation
- Delivery API
- Assets HTTP API
- Content Fragments REST API
- Content Fragments GraphQL API
- Managing GraphQL Endpoints
- Using the GraphiQL IDE
- Persisted Queries
- Optimizing GraphQL Queries
- Updating your Content Fragments for optimized GraphQL Filtering
- Authentication for Remote AEM GraphQL Queries on Content Fragments
- AEM GraphQL API with Content Fragments - Sample Content and Queries
- Hybrid and SPA AEM Development
- Hybrid and SPA with AEM
- SPA Introduction and Walkthrough
- SPA WKND Tutorial
- Getting Started using React
- Implementing a React Component for SPA
- Getting Started using Angular
- SPA Deep Dives
- Developing SPAs for AEM
- SPA Editor Overview
- SPA Blueprint
- SPA Page Component
- Dynamic Model to Component Mapping for SPAs
- SPA Model Routing
- The RemotePage Component
- Editing an External SPA within AEM
- Composite Components in SPAs
- SPA and Server-Side Rendering
- Enabling JSON Export for a Component
- Launch Integration
- SPA Reference Materials
- Development Tools
- Development Tools
- AEM Modernization Tools
- Dialog Editor
- Dialog Conversion Tool
- Developing with CRXDE Lite
- Managing Packages Using Maven
- How to Develop AEM Projects Using Eclipse
- How to Build AEM Projects using Apache Maven
- How to Develop AEM Projects using IntelliJ IDEA
- How to use the VLT Tool
- How to use the Proxy Server Tool
- AEM Brackets Extension
- AEM Developer Tools for Eclipse
- AEM Repo Tool
- Personalization
- Extending AEM
- Extending AEM using Adobe Developer App Builder
- Customizing Page Authoring
- Customizing the Consoles
- Customizing Views of Page Properties
- Configuring your Page for Bulk Editing of Page Properties
- Customizing and Extending Content Fragments
- Content Fragments Configuring Components for Rendering
- Experience Fragments
- Extending Workflows
- Extending the Multi Site Manager
- Tracking and Analytics
- Cloud Services
- Creating Custom Extensions
- Forms
- Integrating Services with the JMX Console
- Developing the Bulk Editor
- Extending Classic UI
- Testing
- Best Practices
- Best Practices Overview
- AEM Development Guidelines and Best Practices
- Development Best Practices
- Content Architecture
- Software Architecture
- We.Retail Reference Implementation
- We.Retail Reference Implementation
- Trying out Content Fragments in We.Retail
- Trying out Core Components in We.Retail
- Trying out Editable Templates in We.Retail
- Trying out Responsive Layout in We.Retail
- Trying out the Globalized Site Structure in We.Retail
- Trying out Experience Fragments in We.Retail
- Coding Tips
- Code pitfalls
- OSGI Bundles
- JCR Integration
- Code Samples
- Troubleshooting Slow Queries
- Mobile Web
Developing and Page Diff
Feature Overview
Content creation is an iterative process. Authoring with efficiency requires being able to see what has changed from one iteration to another. Viewing one page version and then the other is inefficient and prone to error. An author wants to be able to compare the current page to a previous version side-by-side with the differences highlighted.
The page diff allows a user to compare the current page to launches, previous versions, etc. For details of this user feature, see Page Diff.
Operation Details
When comparing versions of a page, the previous version that the user wishes to compare is recreated by AEM in the background in order to facilitate the diff. This is needed to be able to render the content for side-by-side comparison.
This recreation operation is done by AEM internally and is transparent to the user and requires no intervention. However an administrator viewing the repository for example in CRX DE Lite would see these recreated versions within the content structure.
When content is compared, the whole tree up to the page to compare is recreated in the following location:
/tmp/versionhistory/
A cleanup task runs automatically to clean up this temporary content.
Permissions
Previously, in Classic UI, special development consideration had to be made to facilitate AEM diffing (such as using cq:text tag lib, or custom integrating the DiffService OSGi service into components). This is no longer needed for the new diff feature, since the diff occurs client-side via DOM comparison.
However there are a number of limitations that need to be considered by the developer.
-
This feature uses CSS classes that are not name spaced to the AEM Product. If other custom CSS classes or 3rd party CSS classes with the same names are included on the page, the display of the diff may be affected.
html-addedhtml-removedcq-component-addedcq-component-removedcq-component-movedcq-component-changed
-
Because the diff is client-side and executes on page load, any adjustments to the DOM after the client-side diff service has run will not be accounted for. This may affect
- Components that use AJAX to include content
- Single Page Applications
- Javascript based components that manipulate the DOM upon user interaction.
Page diff comparison will only work for the components which have valid cq:editConfig nodes.
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