XBlock Concepts

You build XBlocks that course teams use to create independent course components that work seamlessly with other components in an online course. For example, you can build XBlocks to represent individual problems, lessons, or course sections. For more information, see Introduction to XBlocks.

This part of the tutorial provides conceptual information about XBlocks that all XBlock developers must understand.

• XBlock Fields
  • XBlock Fields and State
  • Field Scope
  • Fields and Data Storage
  • Initializing Fields
  • Fields and OLX
  • Field Requirements in the edX Platform
  • Default Fields in a New XBlock
• XBlock Methods
  • View Methods
  • Handler Methods
  • Default Methods in a New XBlock
• XBlock Fragments
  • Fragment Contents
  • Fragments and XBlock Children
  • Fragments and Views
• XBlock Children
  • XBlock Tree Structure
  • Accessing Children (Server-Side)
  • Accessing Children (Client-Side)
• XBlock Runtimes
  • Runtime Functions
  • Extending XBlocks
  • JavaScript Runtimes
  • XBlock Runtime API
  • Rendering XBlocks with the XBlock URL
• XBlocks, Events, and Grading
  • When an XBlock Should Emit Events
  • Publish Events in Handler Methods
  • Publish Grade Events