Blog

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

Series

Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12

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Frontend PART 14

Advanced JavaScript Forms: FormData, the Constraint Validation API and Fetch

We collect values with form.elements and FormData, write our own rules with validity and setCustomValidity, catch the invalid event, and send the form with fetch without reloading the page.

3 Nov 2026 9 min 6

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 4