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Svelte

Svelte

This packages provides Hellō button components that you can use in a Svelte SPA.

Setup

To add Hellō to your Svelte application, in your project directory:

Install the package

npm i @hellocoop/svelte

Add Hellō stylesheet

To provide the button styling, add the below code to the <head> section of the index.html:

<link rel="stylesheet" href="https://cdn.hello.coop/css/hello-btn.css"/>

Components

import { 
    ContinueButton, 
    LoginButton, 
    UpdateProfileButton,
    LoggedIn,
    LoggedOut,
    HelloProvider,
    useAuth,
    logOut,
    getLogOutRoute
} from '@hellocoop/svelte'

Buttons

<ContinueButton/> - provides [ ō Continue with Hellō ]

<LoginButton/> - provides [ ō Login with Hellō ]

<UpdateProfileButton/> - provides [ ō Update Profile with Hellō ]

Optional properties:

  • scope - Array of Hellō scope values. Default ['openid', 'email', 'name', 'picture'].
  • targetURI - defaults to HELLO_DEFAULT_TARGET_ROUTE or '/'
  • providerHint - Array of provider hints. Example ['github', 'gitlab', 'email--', 'apple--', 'microsoft--'] would always recommend GitHub, GitLab, and Google.
  • loginHint - A hint for which user account to use. Example name@domain.example.
  • domainHint - A hint for the domain of the user's managed account. Example domain.example.
  • promptLogin - defaults to false. Will require the user to re-authenticate at their login provider.
  • promptConsent - defaults to false. Will require the user to review, and potentially change, released claims.

Optional button styling properties:

  • color - white | black
  • theme - ignore-light | ignore-dark | aware-invert | aware-static
  • hover - pop | glow | flare | none

Explore styling with the button playground

Login Status Components

<LoggedIn> - renders children only when user is logged in

<LoggedOut> - renders children only when user is logged out

<LoggedIn>
    <div>Welcome back!</div>
</LoggedIn>
<LoggedOut>
    <ContinueButton />
</LoggedOut>

useAuth() Hook

Hook to get authentication state and user information.

const { auth, isLoading, isLoggedIn } = useAuth()
 
// auth contains:
// - isLoggedIn: boolean
// - sub: string (user identifier)
// - name: string
// - email: string
// - picture: string
// - iat: number (issued at timestamp)

Logout Functions

logOut() - redirects to logout route

getLogOutRoute() - returns logout route URL

<script>
    import { logOut, getLogOutRoute } from '@hellocoop/svelte'
    
    // Redirect to logout
    function handleLogout() {
        logOut()
    }
    
    // Get logout URL for Link component
    const logoutUrl = getLogOutRoute()
</script>
 
<button on:click={handleLogout}>Logout</button>

<HelloProvider/>

By default, clicking the Hellō button would redirect to /api/hellocoop?login=true endpoint with the optional properties as additional query parameters. To override this behavior, wrap your app with the <HelloProvider/> component and pass the config object as a prop to the provider.

Props:

  • auth - Auth object (optional, for server-side rendered auth)
  • config - Route configuration (optional)
App.svelte
<script>
    import { HelloProvider } from '@hellocoop/svelte';
 
    // Default configuration
    const config = {
        login: '/api/hellocoop?login=true',
        auth: '/api/hellocoop?auth=true',
        logout: '/api/hellocoop?logout=true'
    }
    
    // Optional: pass auth object for server-side rendered auth
    export let auth = {}
</script>
 
<HelloProvider {auth} {config}>
    <main>
        <LoggedIn>
            <div>Welcome {auth?.name}!</div>
        </LoggedIn>
        <LoggedOut>
            <ContinueButton />
        </LoggedOut>
    </main>
</HelloProvider>

Complete Example

Here's a complete example showing how to use all the components together:

App.svelte
<script>
    import { 
        HelloProvider,
        LoggedIn, 
        LoggedOut, 
        ContinueButton, 
        LoginButton,
        UpdateProfileButton,
        useAuth,
        logOut,
        getLogOutRoute
    } from '@hellocoop/svelte'
    
    // Optional: pass auth object for server-side rendered auth
    export let auth = {}
</script>
 
<HelloProvider {auth}>
    <UserProfile />
</HelloProvider>
 
<!-- UserProfile.svelte -->
<script>
    import { useAuth, logOut } from '@hellocoop/svelte'
    
    const { auth, isLoading, isLoggedIn } = useAuth()
    
    function handleLogout() {
        logOut()
    }
</script>
 
{#if isLoading}
    <div>Loading...</div>
{:else if isLoggedIn}
    <div>
        <img src={auth.picture} alt={auth.name} />
        <h2>Welcome {auth.name}!</h2>
        <p>{auth.email}</p>
        <button on:click={handleLogout}>Logout</button>
        <UpdateProfileButton targetURI="/profile" />
    </div>
{:else}
    <div>
        <ContinueButton targetURI="/dashboard" />
        <LoginButton targetURI="/dashboard" />
    </div>
{/if}
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