JavaScript (Intermediate) training course

Use intermediate JavaScript to fully utilise the capabilities of Object Oriented JS and the new, exciting HTML5 API’s in your websites

JBI training course London UK

"Our tailored course provided a well rounded introduction and also covered some intermediate level topics that we needed to know. Clive gave us some best practice ideas and tips to take away. Fast paced but the instructor never lost any of the delegates"

Brian Leek, Data Analyst, May 2022

Public Courses

14/09/26 - 3 days
£1495 +VAT
26/10/26 - 3 days
£1495 +VAT
07/12/26 - 3 days
£1495 +VAT

Customised Courses

* Train a team
* Tailor content
* Flex dates
From £1200 / day
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JBI training course London UK

  • Utilise Effective device/feature detection
  • Understand Event handling
  • Explore Inheritance via prototype
  • Exploit Ajax and JSON/JSONP
  • Understand HTML5 media element
  • Explore Functions
  • Test techniques coding via prototypal inheritance and object definition
  • Use intermediate JavaScript to fully utilise the capabilities of Object Oriented JS and the new, exciting HTML5 API’s in your websites

A short Video from TTD & Clean Code With JavaScript Training Course. 

Part 1 Effective device/feature detection

  • This section covers several different ways of detecting the features available in the many browsers that are in common use.  This supports the concept of feature detection commonly used in modern development methodologies.
  • Introduction
  • Modernizr
  • HTML5 feature detection
  • Suggested webpages
  • Feature detection using MIME type

 

Part 2 Event handling

  • This section will look at advanced event handling which allows you to handle events such as drag/drop and touch.
  • Event propagation
  • Advanced event handling

 

Part 3 Inheritance via prototype

  • This section looks at the way JavaScript handles Object Oriented coding via prototypal inheritance and object definition.
  • JavaScript objects definition
  • Prototypes and inheritance
  •  

Part 4 Ajax and JSON/JSONP

  • This section will cover AJAX coding and use, plus the way JavaScript interacts with JSON and JSONP.
  • AJAX technologies
  • Client side
  • Server side
  • JSON/JSONP
  •  

Part 5 HTML5 media element

  • This section looks at the new HTML5 elements available to support embedding media on a webpage.
  • Video
  • Audio
  • Compatibility

 

Part 6 Functions

  • This section covers the use of the arguments object with functions, plus looks at some special types of function commonly used in modern JavaScript , it's frameworks and libraries.
  • The Arguments object
  • First class objects
  • Closures
  • Currying
  • Immediate functions
  • Self-defining functions

 

Part 7 Testing techniques

  • The final section in this course introduces some tools commonly used in the production and testing of JavaScript code.
  • Testing JavaScript
  • Basic testing techniques
  • Code tidiers, syntax checkers & validators
  • Online testing
  • Browser based tools
  • IDE’s
  • Specialist unit test environments – Qunit, JS-Test-Driver

 

Examples and Exercises

  • There are numerous (standards compliant) examples available for this course that illustrate the concepts covered.
  • In addition to the examples there are practical exercises in each section that allow attendees to explore and consolidate their knowledge of the concept.  Further topics are given for future study that relate to the topics covered. 
  • Some of the exercises are done as team work, the remainder are done on an individual basis with the individual choosing the level of complexity they want to code within the exercise parameters.
JBI training course London UK

Javascript developers who need to get to grips with topics beyond the basics

5 star

4.8 out of 5 average

"Our tailored course provided a well rounded introduction and also covered some intermediate level topics that we needed to know. Clive gave us some best practice ideas and tips to take away. Fast paced but the instructor never lost any of the delegates"

Brian Leek, Data Analyst, May 2022



“JBI  did a great job of customizing their syllabus to suit our business  needs and also bringing our team up to speed on the current best practices. Our teams varied widely in terms of experience and  the Instructor handled this particularly well - very impressive”

Brian F, Team Lead, RBS, Data Analysis Course, 20 April 2022

 

 

JBI training course London UK

Certification


Every delegate will be entitled to a certificate of achievement on completion of the course.

If you are missing your certificate - please use the link below to apply - you can also use this link to sign up for the JBI Training newsletter to receive technology tips directly from our instructors - Analytics, AI, ML, DevOps, Web, Backend and Security.
 



Our Intermediate Javascript training course runs as a consultative, workshop-style event, in which discussion of topics such as good programming practices, Closures,  prototypal inheritance and object oriented development using JavaScript takes place in relation to the delegates' own applications and scenarios. JavaScript programming patterns and code smells takes place in relation to the delegates' own applications and scenarios. To facilitate this event, a subject matter expert leads the training, hands-on labs and discussions to ensure course topics are covered in a meaningful, relevant and timely manner.

JBI Training offers twelve courses in this group covering established and foundational web technologies and JavaScript at all levels. Available courses include JavaScript and ECMAScript (three days), JavaScript Intermediate (three days), JavaScript Advanced (three days), JavaScript with Node Beyond the Basics (two days), ECMAScript 6 Introduction (three days), CSS Cascading Style Sheets (two days), jQuery (two days), MongoDB (two days), Backbone.js (two days), Aurelia (three days), Google Polymer.js (three days), and Ext JS (four days). All courses are available as scheduled classroom sessions in London, as live online instructor-led training, or as customised onsite programmes for web development teams.
JavaScript frameworks such as React, Angular, and Vue abstract many details of how JavaScript works, but developers who lack solid JavaScript fundamentals frequently struggle to debug framework code, understand performance issues, or work effectively beyond the patterns the framework provides. A strong grounding in core JavaScript — including the event loop, closures, prototypal inheritance, asynchronous programming with promises and async/await, and the module system — is the foundation that makes developers more effective with any framework or library they use. JBI's three-level JavaScript curriculum (introductory, intermediate, and advanced) is designed to build this foundation systematically regardless of which front-end framework a developer ultimately works with.
ECMAScript is the specification that defines the JavaScript language — the version numbers (ES5, ES6, ES2020, etc.) refer to successive editions of that specification. ECMAScript 6 (also known as ES2015) was the most significant update to JavaScript in over a decade, introducing arrow functions, classes, template literals, destructuring, the spread and rest operators, modules, Promises, let and const declarations, and many other features that are now foundational to modern JavaScript development. JBI's three-day ECMAScript 6 Introduction course covers all of the major ES6 features in depth, with practical exercises applying each feature in realistic web development scenarios. It is suited to JavaScript developers who learned the language before ES6 and want to modernise their skills.
MongoDB is the most widely used document-oriented NoSQL database. Unlike relational databases that store data in tables and rows, MongoDB stores data as flexible JSON-like documents — making it well-suited to applications with variable or evolving data structures, high write throughput requirements, or hierarchical data. JBI's two-day MongoDB course covers the MongoDB architecture and document model, CRUD operations, querying and indexing, the MongoDB aggregation pipeline for data analysis, schema design patterns, replication and high availability, and integrating MongoDB with Node.js applications. It is suited to developers and data engineers building or working with MongoDB-backed applications.
jQuery is a JavaScript library that simplifies DOM manipulation, event handling, AJAX requests, and animation across different browsers. It was the dominant JavaScript library for web development for many years and is still present in a very large number of websites and web applications worldwide — including many maintained enterprise and government systems. While modern frameworks have reduced the need for jQuery in new greenfield development, jQuery skills remain highly relevant for developers maintaining, upgrading, or extending existing codebases that rely on it. JBI's two-day jQuery course covers selecting and manipulating DOM elements, handling events, making AJAX calls, working with jQuery plugins, and integrating jQuery with other web technologies.
CSS (Cascading Style Sheets) is the language used to control the visual presentation of web pages — including layout, typography, colour, spacing, and responsive behaviour across different screen sizes. JBI's two-day CSS course covers the CSS box model, selectors and specificity, positioning and layout techniques including Flexbox and CSS Grid, responsive design with media queries, CSS variables and custom properties, transitions and animations, and best practices for writing maintainable and scalable CSS. It is suitable for web developers, designers, and anyone responsible for the front-end presentation of websites and web applications who wants to build or consolidate their CSS skills.
Yes. All courses in this group can be delivered as customised onsite or online programmes for corporate web development teams. Content and exercises can be tailored to the team's technology stack, existing codebase, and specific learning objectives — for example, a team maintaining a large legacy jQuery-based application can receive training focused on jQuery patterns and modernisation strategies, while a team building Node.js backend services can receive JavaScript and Node training focused on their specific architecture. JBI has delivered web development training for engineering teams at organisations including the BBC, NHS, RBS, Sky, EDF, and Cisco.
Yes. JavaScript and its ecosystem evolve continuously with new ECMAScript specifications released annually, and JBI's JavaScript training content is regularly reviewed to reflect the latest stable language features, current best practices, and modern tooling. This includes updates to JavaScript syntax and APIs, Node.js runtime developments, changes to the CSS specification including new layout and styling capabilities, and the evolving relationship between foundational JavaScript skills and AI-assisted coding tools such as GitHub Copilot and Claude Code — where strong JavaScript fundamentals are increasingly important for evaluating and steering AI-generated code effectively.

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