Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12 Entity Framework Core 28 Dapper 16 Git & GitHub 29 Web Security (OWASP Top 10) 21 LLM Fundamentals 20 C# Fundamentals 20 Object-Oriented Programming in C# 16 C# Collections and Generics 11 LINQ 17 Asynchronous Programming in C# 17 Advanced C# 14 C# Versions 6 Solution Patterns 22

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Frontend PART 14

Intro to the JavaScript DOM: Selecting, Changing and Creating Elements

We meet the DOM tree the browser builds from HTML, select elements with querySelector, see why textContent and innerHTML differ and what XSS is, then change the page live with classList and createElement.

3 Nov 2026 8 min 16

Frontend PART 15

JavaScript Events: Handling Clicks, Keyboard and Input with addEventListener

We listen to click, input, keydown and submit events with addEventListener, and learn about target and key on the event object, preventDefault, removeEventListener and why inline onclick is discouraged.

3 Nov 2026 7 min 15

Frontend PART 16

JavaScript Forms: Reading Values, Handling Submit and Simple Validation

We read form values with value, checked and selectedIndex, catch the submit event, write checks for empty fields, email and length, show errors on the page and get to know HTML's built-in validation.

3 Nov 2026 9 min 22