How do I use the loader feature from react-router v6.4 on the route's element?

Question

I upgraded to [email protected] and I want to use the loader prop.

My router looks like this:

const router = createBrowserRouter(
  createRoutesFromElements(
    <Route>
      <Route path="/" element={<PublicRoute />}>
        <Route path="/" element={<Login />} />
      </Route>
      <Route path="/home" element={<PrivateRoute />}>
        <Route path="/home" element={<Home />}>
          <Route path="dashboard/*" element={<DashboardRoutes />} />
          <Route path="projectSettings/*" element={<ProjectSettingsRoutes />} />
          <Route path="settings/*" element={<SettingsRoutes />} />
          <Route path="testDevelopment/*" element={<TestDevelopmentRoutes />} />
          <Route index element={<Navigate to={'dashboard'} replace />} />
        </Route>
      </Route>
    </Route>,
  ),
);

type props = {
  instance: PublicClientApplication;
};

const Router: FC<props> = ({ instance }) => {
  return (
    <MsalProvider instance={instance}>
      <RouterProvider router={router} />
    </MsalProvider>
  );
};

As you can see these routes render elements that also route. For example I want to use the loader for fetching elements on the UiElements component that is under TestDevelopment, so the element TestDevelopmentRoutes looks like this:

const TestDevelopmentRoutes = () => {
  return (
    <Routes>
      <Route path="" element={<TestDevelopment />}>
        <Route path="customFunctions" element={<CustomFunctions />} />
        <Route path="requirements" element={<Requirements />} />
        <Route path="runResults" element={<RunResults />} />
        <Route path="testCases" element={<TestCases />}>
          <Route path="table" element={<TestCasesTable />} />
        </Route>
        <Route index element={<Navigate to={'testCases'} replace />} />
        <Route path="testPlans" element={<TestPlans />} />
        <Route path="testSuites" element={<TestSuites />} />
        <Route path="uiElements" element={<UiElements />} loader={uiElementsLoader} />
        <Route path="uploads" element={<Uploads />} />
      </Route>
    </Routes>
  );
};

The fetch isn't happening because I can't use Routes anymore to enable the loader feature, but I can't figure out how I should right the routes on TestDevelopmentRoutes so it will work.

Drew Reese · Accepted Answer · 2022-10-24 18:10:20Z

The loaders necessarily need to be passed at-the-time when creating the Data Router. It's because at compile/transpile-time the new Data Router can't possibly know what descendent routes it will be rendering at run-time. All the "test developement" routes would need to be moved into the configuration.

const router = createBrowserRouter(
  createRoutesFromElements(
    <Route>
      <Route element={<PublicRoute />}>
        <Route path="/" element={<Login />} />
      </Route>
      <Route element={<PrivateRoute />}>
        <Route path="/home" element={<Home />}>
          <Route path="dashboard/*" element={<DashboardRoutes />} />
          <Route path="projectSettings/*" element={<ProjectSettingsRoutes />} />
          <Route path="settings/*" element={<SettingsRoutes />} />

          <Route path="testDevelopment" element={<TestDevelopment />}>
            <Route index element={<Navigate to="testCases" replace />} />
            <Route path="customFunctions" element={<CustomFunctions />} />
            <Route path="requirements" element={<Requirements />} />
            <Route path="runResults" element={<RunResults />} />
            <Route path="testCases" element={<TestCases />}>
              <Route path="table" element={<TestCasesTable />} />
            </Route>
            <Route path="testPlans" element={<TestPlans />} />
            <Route path="testSuites" element={<TestSuites />} />
            <Route
              path="uiElements"
              element={<UiElements />}
              loader={uiElementsLoader}
            />
            <Route path="uploads" element={<Uploads />} />
          </Route>

          <Route index element={<Navigate to={'dashboard'} replace />} />
        </Route>
      </Route>
    </Route>,
  ),
);

...

type props = {
  instance: PublicClientApplication;
};

const Router: FC<props> = ({ instance }) => {
  return (
    <MsalProvider instance={instance}>
      <RouterProvider router={router} />
    </MsalProvider>
  );
};

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