Sai Srinivas Sriparasa [Sai Srinivas Sriparasa] - JavaScript and JSON Essentials

• AJAX
  • about /
• AJAX call
  • making /
• ajax method /
• alert_script.html file /
• Apache
  • about /
• Apache web server /
• Array class
  • used, for declaring arrays /
• Array object /
• arrays
  • about /
  • declaring /
  • in JavaScript /
  • initializing /
  • example /
  • element, retrieving from multidimensional array /
  • declaring, Array class used /
• ASP.NET website
  • about /

• callback
  • about /
• Carousel application
  • about /
• cd command /
• code commenting
  • about /
  • single line comments /
  • multiline comments /
• composer
  • about /
  • install command /
  • update command /
• composer.json file /
• config.json file /
  • building /
• cross-domain AJAX calls
  • issues /

• data.json file /
• data property /
• dataType property /
• data types
  • in JSON /
• data_json variable /
• data_json_feed.html file /
• dependency management
  • about /
• developer tools
  • using /

• employeeCount variable /
• employee details
  • retrieving /

• Firebug
  • about /
  • URL, for installing /
• for loop /
• for_employee_company.html file /

• GET AJAX call
  • making, with JSON data /
• getFullName method /
• getJSON method /
• GET method /
• getRedditData callback /

• Hello World program
  • with JSON /
• Hello World website application
  • about /
• HTTP GET method /
• HTTP POST method /

• Inspect Element option /
• Inspect Element with Firebug option /
• install command /

• JavaScript
  • variables /
  • variables declaring, var keyword used /
• JavaScript object
  • and JSON, differences /
• join_year variable /
• jQuery
  • about /
• JSON
  • Hello World program /
  • and JavaScript object, differences /
  • data types /
  • languages, supported /
  • PHP /
  • Python /
  • objects, accessing /
  • modifying /
  • hosting /
  • used, for handling dependency management /
  • for storing metadata /
  • validating /
  • formatting /
• json.loads() method /
• JSON data
  • parsing /
  • POST AJAX calls, making /
  • GET AJAX calls, making /
• JSON Editor Online
  • about /
  • URL /
• JSON feed
  • parsing, while loop used /
• JSONLint
  • about /
  • URL /
• JSONP
  • about /
  • implementation /
• jsonp GET parameter /
• json_decode method /
• json_encode() /

• .length property /
• LAMP
  • about /
• LAMP server
  • about /
• Linux
  • about /
• looping statements
  • using /

• MIME
  • about /
• multiline comments /
• myCallback function /

• Node.js
  • about /
• Node Packaged Modules (NPM)
  • about /
  • URL /

• objects
  • about /
  • creating /
  • in JSON, accessing /
  • accessing /
• onreadystatechange /
• onreadystateChange callback /
• onreadystatechange method /

• package.json file /
• PHP
  • about /
  • script, running /
• POST AJAX call
  • making, with JSON data /
• POST request method /
• Python
  • about /

• readyState property /
• RECURSIVE key /
• Reddit site /
• request object /
• Response tab /

• $, special character /
• same domain policy /
• same origin policy /
• schema.json file /
• semi colon (;) /
• send() method /
• server-side call
  • avoiding /
• single line comments /
• sudo /
• sudo tasksel command /

• tasksel package /
• titleCount variable /
• titles variable /

• update command /

• variables
  • in JavaScript /
  • declaring in JavaScript, var keyword used /
• var keyword
  • used, for declaring variables in JavaScript /

• while loop /
• while_employees_traversal.html file /

• X-Requested-With header /
• XMLHttpRequest /
• XMLHttpRequest object /

• YAML
  • about /
  • config.json file, building /
  • URL /

JavaScript, which was introduced as LiveScript by Netscape Communications Corp, has grown leaps and bounds in the last few years. JavaScript was originally developed to make web pages more interactive, and control the behavior of the page. JavaScript programs are commonly embedded inside an HTML file. HTML is a markup language, and does not manipulate the behavior of a page once its loaded. Using JavaScript, web developers can set rules and verify if the rules were followed, avoiding any remote server resources for input validation or complex number crunching. Today JavaScript is not just used for basic input validation; it is used to access the browser's Document object, to make asynchronous calls to the web server, and to develop end-to-end web applications using software platforms such as Node.JS, which is powered by Google's v8 JavaScript engine.

JavaScript is considered to be one of the three building blocks that are required to create interactive web pages; it is the only programming language in the trinity that is HTML, CSS, and JavaScript. JavaScript is a case sensitive and a space insensitive language, unlike Python and Ruby. A JavaScript program is a collection of statements and those statements have to be included inside the > tags.

Tip

Downloading the example code

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JavaScript has to be invoked from another application such as a browser. Browsers have a built-in JavaScript engine that interprets and executes the JavaScript on the webpage. The interpretation of JavaScript is from top to bottom and goes from left to right. SpiderMonkey and Rhino are few of the early JavaScript engines that were implemented by different browsers, such as Netscape Navigator and Mozilla Firefox.