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Learn how to create a robust password validation system using only JavaScript and HTML, outlining common pitfalls and best practices.
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This video is based on the question https://stackoverflow.com/q/64638957/ asked by the user 'Tony Lau' ( https://stackoverflow.com/u/13752197/ ) and on the answer https://stackoverflow.com/a/64645611/ provided by the user 'Carsten Massmann' ( https://stackoverflow.com/u/2610061/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Effective Password Validation Without jQuery

Creating a secure password validation system is an essential task in web development. While libraries like jQuery can simplify this process, it’s perfectly feasible to implement robust validation using just vanilla JavaScript and HTML. In this post, we’ll discuss a common issue encountered in password validation and how to correct it.

The Problem: Password Validation Issues

A user recently reached out regarding their password validation setup, which is not functioning correctly. The initial setup, consisting of an input for the username and password, attempted to validate user input and provide appropriate feedback. However, regardless of what was inputted, no error messages appeared, causing confusion for users.

Here was the main part of the initial code:

[[See Video to Reveal this Text or Code Snippet]]

The ineffective validation logic meant that users were not receiving necessary prompts to correct their input.

The Solution: A Better Validation Approach

To resolve the issues with password validation, we can implement a more straightforward approach. Below is a revised version of the validation system that enables feedback for both the username and the password while ensuring the password meets complexity requirements.

Step 1: The Updated HTML Structure

Here is a refined HTML structure for the password validator:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: The JavaScript Logic

The following JavaScript code enhances the input validation process:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code:

DOM Elements Collection:

We collect all needed DOM elements into an object for easy access.

Event Listener for Input:

As the user types, if the username or password fields are modified, we validate the occurrence of username characters in the password. This is not case-sensitive.

Event Listener for Validation Button:

When the user hits the "Validate" button, we check:

If the username is empty.

If the password meets the complexity rules, ensuring it has at least:

One uppercase letter

One lowercase letter

One number

A minimum length of 8 characters

If the validation fails, an appropriate error message is displayed.

Conclusion

This approach effectively implements password validation without relying on jQuery, creating a responsive user experience by clearly notifying them of any input errors. By following these guidelines and structure, you can ensure that users are prompted correctly to input valid data.

Remember, clear user feedback is vital for good user experience, so always validate inputs where possible. Happy coding!