Vue i18n - adding locale to the URL using routerview

Question

I am using a scafolded AspNetCore 2.1 site with VueJS using TypeScript. I'm trying to integrate the kazupon i18n plugin with the router-view. Without the URL integration, it works just fine.

I am not able to get the proper redirects working like http://localhost/en/product and http://localhost/fr/product

This is the initial boot.ts, that uses VueI18n

import Vue from 'vue';
import VueRouter from 'vue-router';
import VueI18n from 'vue-i18n'

Vue.use(VueRouter);
Vue.use(VueI18n);

import { messages, defaultLocale } from './lang/i18n';

const i18n = new VueI18n({
    locale: defaultLocale,
    fallbackLocale: 'en',
    messages
})

const routes = [
        { path: '/', component: require('./components/home/home.vue.html') },
        { path: '/product', component: require('./components/product/product.vue.html') },
];

const router = new VueRouter({
    mode: 'history',
    routes: routes
});

new Vue({
    el: '#app-root',
    router: router,
    i18n: i18n,
    render: h => h(require('./components/app/app.vue.html'))
});

So far I have tried prefixing routes but it just breaks the functionality:

const routes = [{
    path: '/',
    redirect: `/${defaultLocale}`,
},
{
    path: '/:locale',
    children: [
        { path: '/', component: require('./components/home/home.vue.html') },
        { path: '/counter', component: require('./components/product/product.vue.html') },
    ]
}];

I've also tried relying on router.beforeEach to set the locale.

router.beforeEach((to, from, next) => {
    let language = to.params.locale;
    if (!language) {
        language = 'en';
    }

    i18n.locale = language;
    next();
});

This does not function either.

I've drawn inspiration from github.com/ashour/vuejs-i18n-demo and vue-i18n-sap-multilingual-best-practice, but it seems that during the i18n migration, some samples may have been obsolete or lost and those use-cases no longer function.

Answer 1

what you primarily needed is to specify the base option in the vue-router constructor.

But first, you need to extract the locale from the url:

let locale = window.location.pathname.replace(/^\/([^\/]+).*/i,'$1');

and then specify the base in your VueRouter constructor:

const router = new VueRouter({
    ...
    base: (locale.trim().length && locale != "/") ? '/' + locale : undefined
    ...
});

and last but not the least, pass the locale into your VueI18n constructor:

const i18n = new VueI18n({
    locale: (locale.trim().length && locale != "/") ? locale : defaultLocale,
    fallbackLocale: 'en',
    messages
})

See the updated example:

import Vue from 'vue';
import VueRouter from 'vue-router';
import VueI18n from 'vue-i18n'

Vue.use(VueRouter);
Vue.use(VueI18n);

import { messages, defaultLocale } from './lang/i18n';

var locale = window.location.pathname.replace(/^\/([^\/]+).*/i,'$1');


const i18n = new VueI18n({
    locale: (locale.trim().length && locale != "/") ? locale : defaultLocale ,
    fallbackLocale: 'en',
    messages
})

const routes = [
        { path: '/', component: require('./components/home/home.vue.html') },
        { path: '/product', component: require('./components/product/product.vue.html') },
];

const router = new VueRouter({
    base: (locale.trim().length && locale != "/") ? '/' + locale : undefined,
    mode: 'history',
    routes: routes
});

new Vue({
    el: '#app-root',
    router: router,
    i18n: i18n,
    render: h => h(require('./components/app/app.vue.html'))
});

Answer 2

Thank you very much @Julian Paolo Dayag, there were three problems with the approach in my question:

1. it requires a redirect to "/" + defaultLocale + to.path
2. the children routes shouldn't start with /, they should be product instead of /product
3. The router.beforeEach... is no longer needed

I ended up with this code:

const routes = [
  {
    path: "/",
    redirect: `/${defaultLocale}`
  },
  {
    path: `/(fr|en)`,
    component: require("./components/app/routertemplate.vue.html"),
    children: [
      { path: "", component: require("./components/home/home.vue.html") },
      {
        path: "product",
        component: require("./components/product/product.vue.html")
      }
    ]
  },
  {
    path: "/(.*)",
    redirect: (to: any) => {
      return "/" + defaultLocale + to.path;
    }
  }
];