Modal routing

This guide walks through enabling modal routing end-to-end. The general idea: the URL always describes a single route, but <RouterView modals> can split the active route into a background and a modal layer based on the navigation that produced it.

Mental model

A modal navigation is a regular router.push (or router.replace) with a modal flag on RouteLocationOptions:

router.push({ path: '/users/42', modal: true });

The patched router converts this into history state that records:

• The backgroundPath — the route that was active when the modal opened.
• The depth — how many parent records of the current route render inside the modal wrapper.

That state travels with the navigation, so a refresh while the modal is open re-opens it on top of the same background.

A <RouterView modals> reads this state and renders two trees in parallel:

1. The background tree — uses BackgroundProvider to override useRoute() to the stored background route.
2. The modal tree — uses ModalProvider and viewDepthKey to render the modal route at the right depth, wrapped in the configured wrapper component.

1. Configure routes

Decide which routes can appear as modals and either declare a per-route wrapper via meta.modal or rely on defaultModal:

import { createRouter } from '@basmilius/routing';
import { createWebHistory } from 'vue-router';
import OverlayWrapper from './layout/OverlayWrapper.vue';
import LightboxWrapper from './layout/LightboxWrapper.vue';

export const router = createRouter({
    history: createWebHistory(),
    routes: [
        {
            path: '/',
            component: () => import('./pages/Home.vue')
        },
        {
            path: '/users/:id',
            component: () => import('./pages/User.vue'),
            meta: {
                modal: { component: OverlayWrapper }
            }
        },
        {
            path: '/photos/:id',
            component: () => import('./pages/Photo.vue'),
            meta: {
                modal: { component: LightboxWrapper, props: { backdrop: 'dark' } }
            }
        }
    ],
    defaultModal: { component: OverlayWrapper }
});

2. Mount a host RouterView

Exactly one <RouterView> needs modals. Place it where the modal layer should mount — typically just outside your top-level layout container.

<template>
    <header>...</header>
    <main>
        <RouterView modals/>
    </main>
</template>

<script
    setup
    lang="ts">
    import { RouterView } from '@basmilius/routing';
</script>

The host runs the background route as a vanilla <RouterView> and renders the modal layer in a Fragment next to it. Other <RouterView> instances in the tree (e.g. nested layouts) render as vanilla.

3. Build a wrapper

A wrapper is a plain Vue component that consumes ModalWrapperProps and exposes a default slot for the modal's inner view. Use <ModalRouterView> when you need an animated child view inside the wrapper.

<!-- OverlayWrapper.vue -->
<template>
    <Teleport to="body">
        <Transition name="overlay">
            <div
                v-if="modalActive"
                class="overlay"
                @click.self="$emit('close')">
                <div class="overlay__content">
                    <Transition name="overlay-inner">
                        <ModalRouterView v-if="modalReady"/>
                    </Transition>
                </div>
            </div>
        </Transition>
    </Teleport>
</template>

<script
    setup
    lang="ts">
    import { ModalRouterView, type ModalWrapperProps } from '@basmilius/routing';

    defineProps<ModalWrapperProps>();
    defineEmits<{
        (event: 'close'): void;
    }>();
</script>

Notes:

• modalActive controls the outer <Transition> — keeps the wrapper mounted across the close animation.
• modalReady is the gate the package flips one tick after modalActive becomes true. Use it to v-if the inner <ModalRouterView> so the inner <Transition> plays its enter animation.
• The wrapper receives an automatic onClose listener that calls router.back(). Bind it via @close="..." or rely on the default emit-driven flow.

4. Open modals from the UI

<RouterLink> accepts a modal prop:

<RouterLink :to="{ path: '/users/42' }" modal>Open user</RouterLink>
<RouterLink :to="{ path: '/users/42' }" :modal="1">Open user with parent layout</RouterLink>

Or push imperatively:

router.push({ path: '/users/42', modal: true });

Modifier-clicks (cmd, ctrl, middle-click) still open the URL in a new tab — the link only opts into modal navigation for primary clicks. Modal routes must therefore be valid stand-alone URLs.

5. Close modals

The wrapper emits close when the user dismisses the modal. The default listener installed by RouterView calls router.back(). To close imperatively from anywhere:

router.back();

Promoting a modal

Sometimes a modal should become a real page — for example, when the user requests a permalink. useRoute exposes a promote() method that replaces the current history entry with the modal URL and clears the modal state:

import { useRoute } from '@basmilius/routing';

const route = useRoute();

async function permalink(): Promise<void> {
    await route.promote();
}

Modal-aware navigation guards

Navigation guards receive bare RouteLocationNormalized objects, which normally don't tell you whether a navigation is a modal. This package augments them with a reactive isModal flag, so to.isModal and from.isModal are available in guards — with the same meaning as useRoute().isModal: true when that location is shown as a modal.

router.beforeEach((to, from) => {
    if (from.isModal && !to.isModal) {
        // leaving the modal layer back to a full page
    }
});

isModal is also present on router.currentRoute.value and on the route from a plain useRoute().

Inside onBeforeRouteLeave

from.isModal works in every guard, including onBeforeRouteLeave. For to.isModal inside onBeforeRouteLeave, import the guard from @basmilius/routing instead of vue-router — vue-router runs leave guards before any global guard could stamp to, so the package ships a thin wrapper that fills it in:

import { onBeforeRouteLeave } from '@basmilius/routing';

onBeforeRouteLeave((to, from) => {
    if (from.isModal && to.isModal) {
        // moving between two modal routes
    }
});

This is Composition-API only. The options-API beforeRouteLeave component option is not wrapped and won't populate to.isModal.

See also

• Slot props guide
• createRouter
• RouterView
• RouterLink
• ModalRouterView
• useModalRoute