only-jsx-router

Declarative browser routing for only-jsx runtime.

Routing rules are declared using Router and Route components.

Router

Router is a root component that declares a route dependent part of an application.

Router props:

• onbeforeupdate - method called by default implementation of update function before DOM updates;
• onupdated - method called by default implementation of update function after DOM updated;

Router component requires context to be set using setContext method of only-jsx library. Router enriches context with router object that contains following properties: path - base path for child Routes params - template parameters of parent route matches - array of matches of all Routes on current routing level error - error that occurred on current routing level childNodes - array of child nodes rendered by the Router match - method that matches current path with path argument and returns the result with matched params; navigate - method for navigation between routers; onunload - method that should be called by parent component to release Router resources (remove event listeners) changeEvent - name of an event that may change the current path. Router listens for this event and updates content when the event is fired; getCurrentPath - method for retrieving the current path; update - method that renders Router children;

Default implementation relies on the browser History API for the frontend routing, so default implementation of navigate is window.history.pushState or window.history.replaceState, changeEvent is popstate, and getCurrentPath returns window.location.pathname.

Default implementation of the match function uses the pathToRegexp function from the path-to-regexp library https://github.com/pillarjs/path-to-regexp. All rules for the path argument of pathToRegexp function work for the path prop value of a child Route component.

Match is usually used by child Route components. Navigate is used by children to trigger transitions between routes.

Route

Route is a child component of the Router that controls rendering of its children depending on the current router path.

Route props:

• path - path which Route renders children for;
• error - component that is rendered in case of any errors in route children;

If Route's paths are overlapped then both are rendered.

Route modifies router object from the context and provides updated properties path, params, matches and error to children.

The default browser history routing strategy can be replaced with custom routing strategy (hash, memory, etc.) via Router component props: match, navigate, changeEvent, getCurrentPath.

It does not provide server side routing. You can use the routing provided by your back-end API for this.

Examples

Our examples also demonstrate how to implement URL hash routing.

Simple

const App = () => <Router>
    <Route path="/(.*)">
        <Route path="path1">{child1}</Route>
        {/* "path2/:param" and "path2/(.*)" are overlapped, both are rendered */}
        {/* this component has params.param === ...rest of path... */}
        <Route path="path2/:param">{child21}</Route>
        {/* this component has params[0] === ...rest of path... */}
        <Route path="path2/(.*)">{child22}</Route>
        <Route path="path3/(.*)">{child3}</Route>
        {/* this is a fallback route */}
        <Route>{fallback}</Route>
    </Route>
</Router>;

More complicated

The source codes are in the repository https://github.com/only-jsx/examples/tree/main/router.

//index.tsx
import { Router, Route } from 'only-jsx-router';

//Router uses Context
import { setContext } from 'only-jsx/jsx-runtime';

export interface AppProps {
    onunload?: () => void;
}

const App = ({ props }: { props: AppProps }): DocumentFragment => {
    const ctx: any = {};
    setContext(Router, ctx);

    const state: UnloadState = {};

    let r = <Router>
        {/*Regular expressions in path*/}
        <Route path="/router/(.*)">
            <Layout />
            {/*Part of a parent route path before any named parameter or regexp*/}
            {/*becames a prefix for a child route*/}
            {/*so this actually matches to /router/home*/}
            <Route path="home"><Home /></Route>
            <Route path="await"><AwaitPage state={state}/></Route>
            <Route path="long-load"><LongLoad state={state}/></Route>
            <Route path="todos" error={ErrorBoundary}>
                <TodosList state={state}/>
            </Route>
            <Route path="todos/(.*)" error={ErrorBoundary}>
                <h5>Todo</h5>
                {/*Named parameters*/}
                <Route path=":id"><Todo state={state}/></Route>
            </Route>
            <Route path="error" error={ErrorBoundary}><ErrorComponent/></Route>
            {/*Route without a path is a fallback route*/}
            <Route><Fallback /></Route>
        </Route>
    </Router>

    props.onunload = ()=>{
        state.onunload?.();
        state.onunload = undefined;
        ctx.router.onunload?.();
    };
    return r;
}

export default App;