JSON on the web

Interactivity on the web

• Requests from the user
  • HTML forms
  • HTML4 events
  • DOM events
• The usual browser/server interaction
  • Obtain information using using the GET or POST methods of HTTP, the Hypertext Transfer Protocol
• Action of the browser
  • Load a page
  • Run a script using the XMLHttpRequest API with data, typically provided in JSON or XML

An example

This is an example of a use of JSON that is not a database application, but illustrates how web applications can use XMLHttpRequest to update a web page.

• Sample JSON output
• Completed “module”
• UM6 Orientation sensor
• Arduino program to read from UM6 and write, in printOrientation, JSON to XBee
• An XBee
• XBee USB adapter for Linux computer
• Python program to read JSON from XBee and write JSON to web server
• HTML page for displaying formatted JSON
• JavaScript to request JSON and modify web page
• module under test