The first parameter in Vue router is optional

Is there a way to make the first parameter in my list of routes optional? I want the parameter to change a header in my api calls if it's present in the url, but everything else should stay the same.

Instead of creating two sets of routes to handle this, can I list the first parameter as optional and define my routes only once?

Each route can contain an :environment param at the beginning:

/:environment/:event_identifier/register/pages/:page_uuid

or it can be:

/:event_identifier/register/pages/:page_uuid

All other parts of the route will remain unchanged.

let routes = [{
   path: '/:event_identifier/register/pages/:page_uuid',
   name: 'ContentPage',
   component: ContentPage,
   meta: {
      requiresAuth: true,
   },
}, {
   path: '/:event_identifier/register/:pagenum',
   name: 'Register',
   component: Register,
   meta: {
      requiresAuth: true,
   },
}, {
   path: '/:event_identifier',
   name: 'Login',
   component: Login,
   children: [{
      path: '/:event_identifier/:registration_uuid/:pagenum',
      name: 'editRegistration',
      component: Login,
   }]
}]

Answer №1

To define an optional parameter, you can use the following syntax:

path: '/myroute/:param?'

Adding a ? after :param signifies that it is optional. This means it will work for both without a parameter and with a parameter.

However, it is recommended to place optional parameters last in each route definition to avoid unexpected behavior. For instance, if you have a route with an optional parameter at the beginning like this:

path: '/myroute/:optional?/:notoptional'

When you visit http://website/myroute/25/100, the value 25 will be matched with :optional?

But if you visit http://website/myroute/25, the value 25 will be matched with :notoptional

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