Form Validation with JavaScript (Step by Step)

Publié le: 11 juin 2025
sur la chaîne: Hashtag Programação

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🚨 Have you ever tried to validate a form and got lost on how to do it the right way?

In this super practical class, you will learn how to validate forms with JavaScript the right way and with all the basics explained step by step.

We'll start with a simple HTML form and, from there, show you how to prevent submission with empty fields, validate password length, use best practices with preventDefault, and even create personalized messages to help the user understand what needs to be corrected.

You'll gain an in-depth understanding of the use of addEventListener, value, required, pattern, and how to apply validations combined with real-world examples.

In addition, I'll show you how to use regular expressions (Regex) to apply advanced rules, and demonstrate how to perform validation via JavaScript or HTML.

This class is essential for anyone who is learning web development, wants to become a Full Stack developer, and needs to create functional, secure, and professional forms.

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Class Content

00:00 Introduction: Form validation with JavaScript
01:02 Creating a simple HTML form
03:35 How to link JavaScript to the form
04:35 Validating user data with JavaScript
06:08 EventListener in the form: how to capture interactions
07:14 Validation rules with JavaScript: step by step
10:40 Validating the form submission securely
11:38 Testing if the validation is working correctly
12:00 Form validation using only HTML
12:40 How to set the password length with JavaScript
14:00 Regex and Pattern in HTML: validation rules for forms
15:51 Conclusion

#fullstack #htmlecss #html #css #javascript #hashtagprogramacao

Sur cette page du site, vous pouvez voir la vidéo en ligne Form Validation with JavaScript (Step by Step) durée heure minute seconde en bonne qualité , qui a été Téléchargé par l'utilisateur Hashtag Programação 11 juin 2025, Partagez le lien avec vos amis et connaissances, sur youtube cette vidéo a déjà été regardée 3,478 fois et il a aimé 268 téléspectateurs. Bon visionnage!

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