D3 Requests
  Duration: 11:42
Part of Course: Introductory D3 Course
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Takeaways:

  • JavaScript is single-threaded, that is - it processes one command at a time
  • Because JavaScript is single-threaded, the ability to do Asynchronous Function calls makes it less susceptible to slow down programs, especially when dealing with a client and server
  • AJAX, an acronym for Asynchronous JavaScript and XML, is a group of interrelated web development techniques used on the client-side to create asynchronous web applications
  • AJAX lets web applications send and retrieve data from a server asynchronously, in the background, without interfering with the display and behavior of the existing web page
  • JavaScript and the XMLHttpRequest object, XHR for short, provide a method for exchanging data asynchronously between browser and server to avoid full page reloads
  • XMLHttpRequest is an API available in web browser scripting languages like JavaScript and supports HTTP requests methods like GET, POST, HEAD, PUT, DELETE, and OPTIONS
  • D3 includes an XHR module, d3.xhr, that creates an asynchronous request for the URL passed into it and has an option to take in a mimType and a JavaScript Callback Function
  • On top of the D3 XHR module site several kinds of type-specific XHR calls that allow for requesting and parsing of specific data
  • The D3 Type-Specific XHR Requests are d3.text, d3.json, d3.xml, d3.html, d3.csv, and d3.tsv

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