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JavaScript and JSON Essentials

You're reading from   JavaScript and JSON Essentials Build light weight, scalable, and faster web applications with the power of JSON

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Product type Paperback
Published in Apr 2018
Publisher
ISBN-13 9781788624701
Length 226 pages
Edition 2nd Edition
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Authors (2):
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Sai S Sriparasa Sai S Sriparasa
Author Profile Icon Sai S Sriparasa
Sai S Sriparasa
Bruno Joseph D'mello Bruno Joseph D'mello
Author Profile Icon Bruno Joseph D'mello
Bruno Joseph D'mello
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Table of Contents (14) Chapters Close

Preface 1. Getting Started with JSON 2. The JSON Structures FREE CHAPTER 3. AJAX Requests with JSON 4. Cross-Domain Asynchronous Requests 5. Debugging JSON 6. Building the Carousel Application 7. Alternate Implementations of JSON 8. Introduction to hapi.js 9. Storing JSON Documents in MongoDB 10. Configuring the Task Runner Using JSON 11. JSON for Real-Time and Distributed Data 12. Case Studies in JSON 13. Other Books You May Enjoy

Introduction to JSONP

In order to get around the same origin policy, we will be using JSONP (JSON with Padding). One exception under the same origin policy is the <script> tag, so scripts can be passed across domains. JSONP uses this exception in order to pass data across domains as a script by adding padding to make the JSON object look like a script. In JavaScript, when a function with a parameter is invoked, we call the function and add a parameter. With JSONP, we pass the JSON feed as a parameter to a function; thereby, we pad our object into a function callback. This function into which the JSON feed has been padded has to be used on the client-side to retrieve the JSON feed. Let's take a quick look at a JSONP example:

In this example, we are padding the students object into the myCallback function and we have to reuse the myCallback function in order to retrieve...

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