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Seed Component with Conditional Rendering - Seed-rust Typing CST Test
Seed Component with Conditional Rendering — Seed-rust Code
Renders different messages based on the model state.
# seed/demo/conditional.rs
use seed::{prelude::*, *};
struct Model { logged_in: bool }
enum Msg { ToggleLogin }
fn init(_: Url, _: &mut Orders<Msg>) -> Model {
Model { logged_in: false }
}
fn update(msg: Msg, model: &mut Model, _: &mut Orders<Msg>) {
if let Msg::ToggleLogin = msg {
model.logged_in = !model.logged_in
}
}
fn view(model: &Model) -> Node<Msg> {
div![
if model.logged_in { h1!["Welcome back!"] } else { h1!["Please log in"] },
button![ev(Ev::Click, |_| Msg::ToggleLogin), "Toggle"]
]
}
#[wasm_bindgen(start)]
pub fn start() {
App::start("app", init, update, view);
}Seed-rust Language Guide
Seed is a Rust framework for creating front-end web apps with WebAssembly. It provides a component-based architecture inspired by Elm, enabling Rust developers to write type-safe, reactive web applications that compile to Wasm.
Primary Use Cases
- ▸Single-page web applications (SPAs) in Rust
- ▸High-performance dashboards and visualizations
- ▸Interactive web games
- ▸Wasm modules for web apps with Rust logic
- ▸Integration-heavy front-end apps needing Rust crates
Notable Features
- ▸Component-based architecture similar to Elm
- ▸Virtual DOM for efficient UI updates
- ▸Reactive message-driven state management
- ▸Rust-to-Wasm compilation for high performance
- ▸Works with wasm-bindgen to access JS and Web APIs
Origin & Creator
Seed was created by IcedDev and the Rust community, first appearing around 2018.
Industrial Note
Seed-Rust is ideal for developers who want Rust’s safety and performance for front-end web apps, especially for Wasm-based projects where speed and correctness are critical.
Quick Explain
- ▸Seed leverages Rust’s strong type system to build reliable and safe web apps.
- ▸It compiles Rust code to WebAssembly for high-performance execution in browsers.
- ▸Uses a virtual DOM and reactive message-driven architecture for UI updates.
- ▸Supports modular components and easy state management.
- ▸Integrates with JavaScript, Web APIs, and standard Rust crates via wasm-bindgen.
Core Features
- ▸Model-Update-View pattern for state management
- ▸HTML macro for defining UI declaratively
- ▸Async tasks and HTTP requests support
- ▸Modular component system
- ▸Integration with standard Rust crates and JS libraries
Learning Path
- ▸Learn Rust basics
- ▸Understand WebAssembly concepts
- ▸Learn Seed Model-Update-View pattern
- ▸Build small apps with Trunk
- ▸Explore JS interop and async tasks
Practical Examples
- ▸Todo app with CRUD operations
- ▸Live data dashboard
- ▸Browser game using Seed components
- ▸Form submission with HTTP request handling
- ▸Integration with WebSocket for real-time updates
Comparisons
- ▸Seed vs Yew: simpler, lighter-weight vs larger ecosystem
- ▸Seed vs React: Rust+Wasm vs JS ecosystem
- ▸Seed vs Elm: similar architecture, Rust vs Elm language
- ▸Seed vs Svelte: reactive UI, Rust vs JS
- ▸Seed vs Vue: component-based vs Rust safety and performance
Strengths
- ▸Strong type safety with Rust
- ▸Near-native performance in the browser
- ▸Easy state and message management
- ▸Compile-time error checking reduces runtime bugs
- ▸Reusable components for maintainable apps
Limitations
- ▸Smaller ecosystem compared to JS frameworks
- ▸Wasm binary size can be large for big apps
- ▸Learning curve for Rust and Wasm newcomers
- ▸Limited third-party UI libraries
- ▸Debugging in Wasm is more complex than plain JS
When NOT to Use
- ▸Pure server-rendered apps without client logic
- ▸Projects needing large JS library ecosystems
- ▸Apps requiring small initial bundle size
- ▸Developers unfamiliar with Rust or Wasm
- ▸Projects needing frequent dynamic UI updates from JS ecosystem
Cheat Sheet
- ▸cargo install trunk -> install Trunk
- ▸cargo generate --git https://github.com/seed-rs/seed-templates -> create new project
- ▸trunk serve -> build & serve locally
- ▸Model + Msg + update + view -> core app structure
- ▸HTML! macro -> render virtual DOM
FAQ
- ▸Can Seed be used with JS libraries?
- ▸Yes, via wasm-bindgen interop.
- ▸Is Seed production-ready?
- ▸Yes, many SPAs are deployed with Seed and Wasm.
- ▸Does Seed support routing?
- ▸Yes, via Seed routing module.
- ▸Can Seed apps call APIs?
- ▸Yes, async tasks and fetch APIs are supported.
- ▸Is Rust knowledge required?
- ▸Yes, basic Rust and ownership understanding is recommended.
30-Day Skill Plan
- ▸Week 1: Rust fundamentals and Wasm compilation
- ▸Week 2: Seed counter and form apps
- ▸Week 3: Component-based apps and routing
- ▸Week 4: Async tasks, API integration
- ▸Week 5: Large SPA with reusable components and performance optimization
Final Summary
- ▸Seed allows Rust developers to build type-safe, high-performance front-end web apps.
- ▸Uses WebAssembly for near-native performance.
- ▸Component-based, message-driven architecture inspired by Elm.
- ▸Ideal for SPAs, dashboards, games, and Rust-to-Wasm apps.
- ▸Bridges Rust ecosystem with modern web development.
Project Structure
- ▸Cargo.toml - Rust dependencies and project metadata
- ▸src/lib.rs or main.rs - main app logic
- ▸index.html - HTML entry point for Wasm app
- ▸static/ - static assets like CSS and images
- ▸components/ - optional folder for reusable Seed components
Monetization
- ▸High-performance SaaS web apps
- ▸Interactive web games
- ▸Web dashboards for enterprises
- ▸Browser-based cryptography tools
- ▸Rust+Wasm modules for paid platforms
Productivity Tips
- ▸Reuse components and Model/Msg patterns
- ▸Minimize Rust crate imports for smaller Wasm size
- ▸Batch state updates to reduce re-renders
- ▸Use Trunk watch for live reload
- ▸Document message handling clearly
Basic Concepts
- ▸Model - app state
- ▸Msg - messages representing user events or actions
- ▸Update - function to update Model based on Msg
- ▸View - function mapping Model to HTML/DOM
- ▸Component - reusable UI building block