What is ApplicationV2 in Foundry VTT?

ApplicationV2 is the modern, flexible UI framework introduced in Foundry VTT V12, designed to replace the legacy Application v1 class with a more robust rendering lifecycle and better performance.

Can I use this for legacy FormApplication development?

Yes, it includes reference patterns for maintaining legacy forms, though the primary focus is helping you migrate those forms to the more efficient ApplicationV2 system.

Why use this skill instead of general Javascript coding?

Foundry VTT has a highly specific API and lifecycle (e.g., _prepareContext, _onRender). This skill provides Claude with the domain-specific knowledge to avoid errors that generic AI might miss.

Does this skill support complex, multi-tabbed windows?

Absolutely. It provides specific configurations for the PARTS object and TABS definition to manage complex layouts, including scroll preservation across renders.

How does this skill handle form submission?

It implements the recommended static action pattern and ensures the critical 'tag: form' option is used, preventing common errors where forms fail to trigger their submit handlers.

Foundry VTT Applications UI

Name: Foundry VTT Applications UI
Author: ImproperSubset

byImproperSubset

0•

ゲーム開発

Develops and migrates custom user interface windows, forms, and dialogs for Foundry VTT using the modern ApplicationV2 framework.

This skill provides specialized guidance for creating modern user interfaces within the Foundry Virtual Tabletop ecosystem. It focuses on the ApplicationV2 API introduced in V12, offering standardized patterns for Handlebars-based windows, complex form handling with static actions, and the use of DialogV2 for interactive prompts. Whether building custom module settings, character sheet components, or migrating legacy v1 applications, this skill ensures developers follow best practices for the render lifecycle, event handling, and multi-part template management while avoiding common pitfalls like missing form tags or context loss.

主な機能

01Comprehensive lifecycle management and V1 to V2 migration support

02Form handling with static actions and automatic data expansion

03ApplicationV2 and HandlebarsApplicationMixin implementation patterns

04DialogV2 patterns for confirmations, prompts, and custom buttons

05Multi-part template configuration and scroll-preserved tab navigation

060 GitHub stars

ユースケース

01Creating interactive dialogs for game-specific mechanics or character name prompts

02Building custom module configuration windows with complex, responsive layouts

03Migrating existing V10/V11 modules to the modern V12+ ApplicationV2 framework

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add impropersubset/hh-agentics fvtt-applications

For use in Claude.ai and ChatGPT

Download Skill