How to create and use an optional parameter in Vue Router?

Question

I need to route to a certain component in two ways - one with a param, one without. I have searched for optional params and somehow can't find much info.

So my route:

{
    path: '/offers/:member',
    component: Offers,
    name: 'offers',
    props: true,
    meta: {
        guest: false,
        needsAuth: true
    }
},

When I call it with the param programmatically, all is fine

this.$router.push({ path: /offers/1234 });

However I also need to call it via nav like this

<router-link to="/offers">Offers</router-link>

The offers component accepts the prop

props: ['member'],

And component used as such

<Offers :offers="data" :member="member"></Offers>

Now the ugly way I've managed to get it working is duplicating the route and making one of them not take props:

{
    path: '/offers',
    component: Offers,
    name: 'offers',
    props: false,
    meta: {
        guest: false,
        needsAuth: true
    }
},

It actually works, but i'm not happy with it - also in dev mode vuejs is warning me [vue-router] Duplicate named routes definition: { name: "offers", path: "/offers" }

Surely there's a way to do optional param in the component call :member="member" ?

Answer 1

Just adding a question mark ? will make it optional.

{
    path: '/offers/:member?',
    ...
},

It works for Vue Router 2.0 onward.

Source: https://github.com/vuejs/vue-router/issues/235#issuecomment-245447122

Answer 2

For advanced routes matching patterns the manual says :

vue-router uses path-to-regexp as its path matching engine, so it supports many advanced matching patterns such as optional dynamic segments, zero or more / one or more requirements, and even custom regex patterns. Check out its documentation for these advanced patterns, and this example of using them in vue-router.

path-to-regexp page/manual => https://github.com/pillarjs/path-to-regexp/tree/v1.7.0#parameters

Answer 3

Additionally, you can also send different params, from where you call your route.

<router-link
  :to="{
    name: 'ComponentName',
    params: { member: {}, otherParams: {} }
  }"
/>