Wasm SDK

wasm.BindContent(id string, ptr *string)

One-way Go → DOM binding. Monitors the ptr pointer and updates the innerHTML of the element id on every mutation.

count := "0"
wasm.BindContent("counter-display", &count)
// Now if count = "42", the DOM will show "42" automatically

wasm.BindInput(id string, ptr *string)

Two-way Go ↔ DOM binding. Synchronizes an <input> HTML value with the Go variable in both directions (input ↔ program).

name := "World"
wasm.BindInput("name-input", &name)
// name is updated upon every keystroke in the input

state.New[T any](initial T) *Signal[T]

Creates a new Reactive Signal (in `stew/state`). Allows for precise tracking of the client app state for Auto-Tracking.

count := state.New(0)
username := state.New("Visitor")

state.Effect(cb func())

Registers a side effect (in `stew/state`). It executes immediately, detects which .Get() calls are made, and automatically re-executes only when one of those Signals mutates.

count := state.New(0)

state.Effect(func() {
    Console.Log("Counter:", count.Get()) // Executed only when count changes
})

wasm.OnClick(id string, handler func())

Shorthand for attaching a click listener to an element by its ID. Equivalent to OnEvent(id, "click", handler).

wasm.OnClick("my-button", func() {
    count++
})

wasm.OnEvent(id string, eventName string, handler func())

Attaches a listener for any DOM event on an element by its ID.

wasm.OnEvent("search-input", "input", func() {
    // Triggered on every keystroke in the input
})

wasm.OnEvent("form", "submit", func() {
    // Intercept form submission
})

wasm.GetPageDataJSON() string

Retrieves the stew.PageData JSON injected by the server in <script id="stew-pagedata">. Returns "{}" if missing.

rawJSON := wasm.GetPageDataJSON()
var state map[string]interface{}
json.Unmarshal([]byte(rawJSON), &state)

wasm.StartReactivityLoop()

Called automatically by the compiler at the end of each Wasm bundle. Keeps the main Wasm thread alive indefinitely (via select {}). Never call this manually.