ractivejs/ractive
Ractive
Ractive is an open-source JavaScript framework for building reactive user interfaces where the DOM automatically updates when underlying data changes. It is fundamentally a declarative data binding library that synchronizes data between the model and the view, enabling two-way binding without manual DOM manipulation, and operates as a template-based component system for composing markup, styles, and logic into reusable UI components.
The framework distinguishes itself through a plugin-extensible architecture that allows custom components, adaptors, and extensions to be registered without modifying the core library. It employs a virtual DOM diffing approach to compute minimal changes between virtual tree snapshots after data mutations, and includes a transition animation engine for animating element insertion and removal using CSS transitions and JavaScript callbacks coordinated with DOM updates. Ractive also features an adaptor-based data binding system that connects external data sources through pluggable adaptors, an event delegation system that attaches listeners to parent elements, and a mustache-based template compilation pipeline that compiles HTML templates into virtual DOM trees.
The framework supports composing reusable components that encapsulate templates, styles, and logic, with scoped CSS to prevent style leakage across the page. It provides reactive data updates that change only affected DOM nodes without full re-rendering, two-way form binding that links data models to form inputs, and declarative event handling with a straightforward syntax. Ractive also includes built-in support for animating DOM elements as they appear, change, or leave, including SVG elements and custom animation sequences.