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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

By : Ray Rischpater, Brian Ritchie
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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

1 (2)
By: Ray Rischpater, Brian Ritchie

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 (12 chapters)
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11
Index

Getting the progress of an asynchronous request

Our request is pretty lightweight but that's not always going to be the case in your application. Moreover, progressing is especially important in mobile web applications, where the mobile device may move in and out of network coverage and suffer temporary network outages. A robust application will test progress status and errors and retry important requests.

The XMLHttpRequest object provides events for it to notify you about the progress of a pending request. These events are as follows:

  • load: This event executes immediately after you open a connection.
  • loadstart: This event executes as a load first starts.
  • progress: This event executes periodically as the load takes place.
  • error: This event executes in the event of a network error.
  • abort: This event executes in the event that the network transaction is aborted (such as the user navigating away from the page issuing the request).

How to do it...

For each of these events, you'll want to...

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