How to use router in vue composition api?

Question

I defined a route in vue:

/users/:userId

Which point to UserComponent:

<template>
 <div>{{username}}</div>
</template>

and I use computed from @vue/composition-api to get the data.

the problem is when the route change to another userId, by navigate to another user, the user in the html template not changed as what I expected. also it doesn't do redirect when the the user is not in the list.

So what I can do to fix that?

here is my code:

<template>
  <div>{{username}}</div>
</template>

<script lang="ts">
import { computed, defineComponent, ref, getCurrentInstance } from '@vue/composition-api';

export const useUsername = ({ user }) => {
  return { username: user.name };
};

export default defineComponent({
  setup(props, { root }) {
    const vm = getCurrentInstance();

    const userToLoad = computed(() => root.$route.params.userId);
    const listOfUsers = [
      { userId: 1, name: 'user1' },
      { userId: 2, name: 'user2' },
    ];

    const user = listOfUsers.find((u) => u.userId === +userToLoad.value);
    if (!user) {
      return root.$router.push('/404');
    }

    const { username } = useUsername({ user });

    return { username };
  },
});

</script>

Answer 1

as with documentation from vue-router site

import { useRouter, useRoute } from 'vue-router'

export default {
  setup() {
    const router = useRouter()
    const route = useRoute()

    function pushWithQuery(query) {
 if (!user) {
      
router.push({
        name: '404',
        query: {
          ...route.query,
        },
      })
    }
    }
  },
}

Answer 2

A had the same problem. I use vue 2 and @vue/composition-api

My resolution:

Created: src/router/migrateRouterVue3.js

import { reactive } from '@vue/composition-api';
import router from './index';

const currentRoute = reactive({
  ...router.currentRoute,
});

router.beforeEach((to, from, next) => {
  Object.keys(to).forEach(key => {
    currentRoute[key] = to[key];
  });
  next();
});

// eslint-disable-next-line import/prefer-default-export
export function useRoute() {
  return currentRoute;
}

after that, I can usage:

// import { useRoute } from 'vue-router';
import { useRoute } from '@/router/migrateRouterVue3';

---

Resolution for you:

// replace:
// const userToLoad = computed(() => root.$route.params.userId);
// to:  
import { useRoute } from '@/router/migrateRouterVue3';
//...
const route = useRoute();
const userToLoad = computed(() => route.params.userId);