rival-black

how can I match a route with same component and not rerender?

I want to render my /login and /register pages with the same component. the router should render the same component but only change disabled properties on input fields and toggle this className on an overlay div. simple recreation:

function RouteComponent() {
  const isLoginPage = getIsLoginPage(); // match based on url being /login or /register

  const togglePage = () => {
    // toggle between login/register
  }

  return (
    <div className="flex">
      <div 
        className={cn(
          "w-1/2 absolute top-0 h-full",
          isLoginPage ? "left-0" : "left-1/2"
        )}
      >
        <button>{isLoginPage ? "Register" : "Login"}</button>
      </div>
      <form>
        <input name="username" disabled={!isLoginPage} />
        <input name="password" disabled={!isLoginPage} />
        <button type="submit" disabled={!isLoginPage}>
          login
        </button>
      </form>
      <form>
        <input name="username" disabled={!isLoginPage} />
        <input name="password" disabled={!isLoginPage} />
        <button type="submit" disabled={!isLoginPage}>
          register
        </button>
      </form>
    </div>
  )
}

function RouteComponent() {
  const isLoginPage = getIsLoginPage(); // match based on url being /login or /register

  const togglePage = () => {
    // toggle between login/register
  }

  return (
    <div className="flex">
      <div 
        className={cn(
          "w-1/2 absolute top-0 h-full",
          isLoginPage ? "left-0" : "left-1/2"
        )}
      >
        <button>{isLoginPage ? "Register" : "Login"}</button>
      </div>
      <form>
        <input name="username" disabled={!isLoginPage} />
        <input name="password" disabled={!isLoginPage} />
        <button type="submit" disabled={!isLoginPage}>
          login
        </button>
      </form>
      <form>
        <input name="username" disabled={!isLoginPage} />
        <input name="password" disabled={!isLoginPage} />
        <button type="submit" disabled={!isLoginPage}>
          register
        </button>
      </form>
    </div>
  )
}

9 Replies

tame-yellow•13mo ago

check useMatches

rival-blackOP•13mo ago

heres a codesandbox, got it to work. I handle everything in the _auth.lazy.tsx component, which is kinda weird, but it works. LMK if you got a better solution https://codesandbox.io/p/github/zdenkolini/tanstack-router-single-route-auth/main?import=true

tame-yellow•13mo ago

just a hint, you don't need to use lazy anymore with automatic codesplitting

rival-blackOP•13mo ago

other than that, you wouldn't change anything?

tame-yellow•13mo ago

i personally would pass the route I am on via a prop into the component if it is just two routes, why complicate things

rival-blackOP•13mo ago

so if I understand this right, just create a child component that takes in the isLoginRoute boolean as a prop and keep the router setup regarding route definitions and isLoginRoute boolean derivation logic? IMO there should be an example or functionality of defining possible options for url parameters for example /auth/:page(login|register) to register 2 routes that render the same component

rival-blackOP•13mo ago

here is an example of such a route for react router v5 https://v5.reactrouter.com/web/api/generatePath

ReactRouterWebsite

React Router: Declarative Routing for React

Learn once, Route Anywhere

rival-blackOP•13mo ago

via the current docs, I think this is possible to achieve with a loader that will throw notFound() if the url parameter is not one of the 2 :pages. I'll update the sandbox and get back to you to showcase what I mean

tame-yellow•13mo ago

contributions are always welcome!

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how can I match a route with same component and not rerender?

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