How do I create a custom validator in Parsley.js?

Extend Parsley by defining custom validators using its API, typically by adding JavaScript that registers new validation rules. Refer to the doc/ directory for examples on integrating custom logic with the declarative attribute system.

Parsley.js vs jQuery Validate: which is better for form validation?

Parsley.js uses a declarative HTML attribute approach for minimal JavaScript, while jQuery Validate is more programmatic and plugin-based. Choose Parsley if you prefer simplicity and quick setup; opt for jQuery Validate if you need finer control and are deep into jQuery ecosystems.

Can Parsley.js work with single-page applications like Angular?

It's possible but not ideal, as Parsley relies on jQuery and direct DOM manipulation, which can conflict with Angular's data-binding and change detection. Consider framework-specific validation libraries for better integration.

How to change error messages to Spanish in Parsley?

Override default messages by setting localized strings in Parsley's configuration or using custom data-parsley-* attributes for messages. The documentation highlights customizable message support for easy localization.

Is Parsley.js still maintained in 2023?

Yes, but minimally—it's in stable maintenance mode where bug fixes are accepted, but no new features are planned. It's reliable for existing projects but not actively evolving with web trends.

How to validate that an email field is unique using Parsley?

Parsley doesn't natively support async validation like server-side checks. You'd need to implement custom validation with JavaScript for such scenarios, as its declarative attributes are best for client-side, static rules.

Parsley.js — HTML Attribute Form Validation

What is Parsley.js?

Parsley.js is a JavaScript form validation library that allows developers to add client-side validation to web forms using only HTML attributes. It solves the problem of writing repetitive validation code by providing a declarative approach where validation rules are specified directly in the HTML markup. The library automatically handles error display and validation logic without requiring custom JavaScript implementation.

Target Audience

Frontend developers and web designers who need to implement form validation quickly without writing extensive JavaScript code, particularly those working with jQuery-based projects.

Value Proposition

Developers choose Parsley because it eliminates the need to write validation JavaScript while providing comprehensive validation features through a simple HTML attribute system. Its jQuery dependency makes it easy to integrate into existing projects, and its declarative approach reduces code maintenance overhead.

Validate your forms, frontend, without writing a single line of javascript

Use Cases

Best For

Adding client-side validation to existing jQuery-based web applications
Quickly prototyping forms with validation requirements
Projects where developers want to avoid writing custom validation JavaScript
Implementing cross-field validation without complex logic
Websites needing customizable validation error messages
Maintaining consistent validation behavior across multiple forms

Not Ideal For

Projects using modern JavaScript frameworks like React or Vue that have built-in validation ecosystems
Applications requiring zero jQuery dependencies or aiming for lightweight vanilla JavaScript solutions
Teams seeking actively maintained libraries with frequent feature updates and modern API improvements
Server-side rendered applications where JavaScript-based validation might conflict with hydration or static generation

Pros & Cons

Pros

Declarative Validation Simplicity

Allows validation rules to be defined directly in HTML using data-parsley-* attributes, eliminating the need for custom JavaScript code as highlighted in the project description.

Comprehensive Built-in Validators

Includes common validators like required, email, number, and pattern matching, providing out-of-the-box solutions for most form validation needs without additional setup.

Automatic UI Feedback

Automatically adds error classes and displays messages next to invalid fields, improving user experience without requiring extra CSS or JavaScript for error handling.

Cross-Field Validation Support

Enables validation based on other field values, such as password confirmation, through declarative attributes, facilitating complex logic without writing custom JavaScript.

Cons

jQuery Dependency

Requires jQuery version 1.8 or higher, which adds overhead and complicates integration in projects not using jQuery or moving towards modern frameworks.

Stagnant Development

The project is in maintenance mode with no new features planned, limiting its relevance for applications needing updates aligned with evolving web standards.

Documentation Fragmentation

Documentation is split between index.html and doc/ files, making it less accessible and harder to navigate compared to centralized online documentation.

Frequently Asked Questions

What is Parsley.js?

Target Audience

Frontend developers and web designers who need to implement form validation quickly without writing extensive JavaScript code, particularly those working with jQuery-based projects.

Value Proposition

Use Cases

Best For

Adding client-side validation to existing jQuery-based web applications
Quickly prototyping forms with validation requirements
Projects where developers want to avoid writing custom validation JavaScript
Implementing cross-field validation without complex logic
Websites needing customizable validation error messages
Maintaining consistent validation behavior across multiple forms

Not Ideal For

Projects using modern JavaScript frameworks like React or Vue that have built-in validation ecosystems
Applications requiring zero jQuery dependencies or aiming for lightweight vanilla JavaScript solutions
Teams seeking actively maintained libraries with frequent feature updates and modern API improvements
Server-side rendered applications where JavaScript-based validation might conflict with hydration or static generation

Pros & Cons

Pros

Declarative Validation Simplicity

Allows validation rules to be defined directly in HTML using data-parsley-* attributes, eliminating the need for custom JavaScript code as highlighted in the project description.

Comprehensive Built-in Validators

Includes common validators like required, email, number, and pattern matching, providing out-of-the-box solutions for most form validation needs without additional setup.

Automatic UI Feedback

Automatically adds error classes and displays messages next to invalid fields, improving user experience without requiring extra CSS or JavaScript for error handling.

Cross-Field Validation Support

Enables validation based on other field values, such as password confirmation, through declarative attributes, facilitating complex logic without writing custom JavaScript.

Cons

jQuery Dependency

Requires jQuery version 1.8 or higher, which adds overhead and complicates integration in projects not using jQuery or moving towards modern frameworks.

Stagnant Development

The project is in maintenance mode with no new features planned, limiting its relevance for applications needing updates aligned with evolving web standards.

Documentation Fragmentation

Documentation is split between index.html and doc/ files, making it less accessible and harder to navigate compared to centralized online documentation.

Frequently Asked Questions

Parsley.js

What is Parsley.js?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

Parsley.js

What is Parsley.js?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?