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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

By : Ray Rischpater
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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

1 (2)
By: Ray Rischpater

Overview of this book

If you're writing applications that move structured data from one place to another, this book is for you. This is especially true if you've been using XML to do the job because it's entirely possible that you could do much of the same work with less code and less data overhead in JSON. While the book's chapters make some distinction between the client and server sides of an application, it doesn't matter if you're a frontend, backend, or full-stack developer. The principles behind using JSON apply to both the client and the server, and in fact, developers who understand both sides of the equation generally craft the best applications.
Table of Contents (17 chapters)
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JavaScript JSON Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Parsing the returned JSON


Once the server returns the result, you need a way to get that result from the XMLHttpRequest object and convert the result from a string to a JavaScript object.

How to do it...

The XMLHttpRequest object defines the onreadystatechange attribute to which you assign a function that is called periodically throughout the lifespan of a request. Here's our doAjax function in its entirety, including a function assigned to this attribute to monitor the request for completion:

function doAjax() {
  var xmlhttp;
  xmlhttp = new XMLHttpRequest();

  var request = { 
    call: "kf6gpe-7"
  };

  xmlhttp.addEventListener("loadstart", loadstart, false);
  xmlhttp.addEventListener("progress", progress, false);  
  xmlhttp.addEventListener("load", load, false);
  xmlhttp.addEventListener("abort", abort, false);
  xmlhttp.addEventListener("error", error, false);

  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4 &&xmlhttp.status == 200)
    {
    ...

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