In Object-Oriented programming languages, an interface defines a set of methods which a Class must include in order to implement the interface (otherwise, if the Class is missing the required methods, the code will fail and the interface will throw an error).

Interfaces are useful for making sure developers use the correct implementation of an API.

In JavaScript there are no true "classic" Object-Oriented features, but through clever usage of the language you can emulate an Interface for use with a JavaScript API. In this free HTML JavaScript tutorial, Mark McDonnell guides you how to implement Interfaces in the JavaScript programming language.

This free HTML JavaScript tutorial provides 45+ JavaScript/jQuery tips and tricks that help you work in JavaScript tasks better, through live HTML JavaScript example codes. List of some JavaScript tips and tricks:

- Refreshing the src of an image with jQuery?
- Check if an image is loaded or not with jQuery
- Remove selected text after mouse double click JavaScript event
- Validate an email address
- Check if an HTML control element exists
- Cancel an AJAX request
- Select all HTML checkboxes
- Selecting root element of a certain level in the document
- Searching a string in jQuery

Please go to the full post page for full detailed tips and HTML JavaScript example codes, then try some JavaScript tutorials:

- 10 Small Javascript Tricks You Should Master
- Some Basic Tips and Tricks for Speeding Up JavaScript
- 10 jQuery and JavaScript Tips and Tricks to Improve Your Code
- 5 Good and Small JavaScript Tips and Tricks

In this free HTML JavaScript tutorial, the dummies will have some simple, short concepts about JavaScript OOP programming, OOP in JavaScript such as: how to define a JavaScript class, how to set Publich methods, how to set Private variables, how to set static methods, ... through some simple HTML JavaScript example codes.

Read more JavaScript OOP tutorials below:

- OOP in JavaScript: Some Basics
- Simple Concepts about Types and Objects in JavaScript OOP
- JavaScript OOP - Scopes and Contexts
- OOP JavaScript: Public and Private Methods
- Basic OOP Concepts in Javascript

This free HTML JavaScript tutorial guides you how to use AJAX and the JavaScript framework jQuery to pass the return data from PHP to JavaScript. Please go to the full post page for detailed PHP and JavaScript instructions and JavaScript example codes.

Read more HTML JavaScript tutorials about PHP in JavaScript on jsB@nk:
- PHP print_r function in JavaScript

Without JavaScript, we can still switch web content with CSS. It's so incredible but it's so true, just click into this free HTML example code, for testing it by yourself, to find how to make CSS content switch on your own web page. This switch content script is really super easy and use.

At present, the world of Internet changed, became more and more popular to surfing. The web pages become more beautiful, worth and obviously they also become bigger to load. But web surfers do not like waiting for your page, this is the big problem to all web developers. Use a web development tip in this free HTML JavaScript tutorial, maybe you shorten the time for loading your web pages, by setting caches your external CSS and JavaScript files along with compressing them.

Please go to the detailed post for full instructions and notes, then check more web development tip on [email protected]:

- Best Ways to Preload Image JavaScript with CSS, AJAX
- Efficient and Helpful JavaScript/jQuery Tips and Tricks
- Some Basic Tips and Tricks for Speeding Up JavaScript
- Some Basic JavaScript Guidelines for Accessibility
- Testing the time to load JavaScript and DOM with jQuery

WordPress - an open source powerful PHP platform to develop personal web blogs, WordPress is the most used blog system at present, and I also opened a personal blog base this platform recently.

At the time of this free HTML JavaScript tutorial, the WordPress founding organization has released version 3 - an extreme worthwhile upgrade. And if you're a WordPress developer, maybe you know the WordPress's disadvantages, one of them is the way to organize data, source code seems to be changed in every new version.

Only including JavaScript files in the WordPress platform, also is a big problem. So under the view of a web developer, which solution we should choose to have a better performance? Please go to the detailed post for more instructions about including JavaScript like a WordPress master.

This free AJAX JavaScript tutorial guides you how to build a simple AJAX application using PHP and JavaScript. This free HTMl JavaScript tutorial provides you some helpful information about JavaScript and AJAX: How AJAX works, A simple AJAX web request (with JavaScript example code), Simple AJAX web request Code Explanation.

Free photo gallery is one of the interesting features in the world of web.

This free HTML JavaScript tutorial don't guide you create a flash sliding gallery, but sliding image gallery; by using jQuery scrollable UI library.

Please go to the detailed post to get full instructions and JavaScript example codes for a beautiful web photo gallery on your website.

Instead of using one server to host multiple sites, cloud hosting uses clusters - a series of multiple servers - to provide larger disk space and better hosting performances. Cloud hosting allows larger disk space and bandwidth quota to be presented at a lower cost. Your site may not be stored in one machine, but you can still manage it easily from a single control panel or user interface.

Since multiple servers are used to host websites - designed to be redundant and synchronous - your site can be easily maintained and downtime can be substantially reduced. No need to worry about heavy traffic, because all servers in the cloud will work together and produce better overall performances.