vue-router - how to abort route change in beforeRouteEnter - vue.js

I'm seeing some behaviour I don't understand in the beforeRouteEnter navigation guard with vue.js/vue-router. I understand from the docs that this guard "does NOT have access to this component instance", but that if you need to get access to the component instance you can do so by means of a callback. I've done this because I want to abort the route change if one of the props hasn't been defined (normally because of a user clicking a forward button). So this is what I have:
beforeRouteEnter(to, from, next) {
console.log("ProductDetail: routing from = "+from.path+" to "+to.path);
next(vm => {
if (!vm.product) {
console.log("Product empty: routing back one page");
vm.$router.go(-1);
}
});
},
The idea is that I test for the existence of the prop and if it's not valid, go back (or otherwise abort the route change). From the console log, I can see that what is happening, though, is that the component instance is in fact getting created, presumably as a result of the callback being called, and throwing a bunch of errors, before the vm.$router.go(-1) kicks in and takes the user back to the previous screen.
So what, if anything, can I do to actually prevent the route change from completing if one of the requisite conditions isn't present, if it's too late by the time I can test for it?

You can try this code
beforeRouteEnter(to, from, next) {
// Your code
next(vm => {
if (!vm.product) {
console.log("Product empty: routing back one page");
next(from)
}
});
}
You can read more about this guard in https://router.vuejs.org/en/advanced/navigation-guards.html

Have you tried: next(false)?
next(false): abort the current navigation. If the browser URL was changed (either manually by the user or via back button), it will be reset to that of the from route.
Reference

Related

Is there anyway to ignore the *failure: Avoided redundant navigation to current location* error using Vue Router and just refresh the page?

I see this question has been asked a few times on here, but none of the answers have really helped me in this current situation.
I have an app I'm working on with a sidebar with tabs that link to different dashboards. Each of the SidebarLinks are a router-link with the to key being fed the route prop from the main component.
Inside one of these dashboards, the Analysis dashboard, there is another router that routes you to child routes for specific Analyses with their own ids (EX: /analysis/1).
The user clicks on a button for a specific analysis and they are routed to a page containing that information, on the same page.
The Error
When I click the Analysis SidebarLink the route in the url changes back to /analysis, but the page doesn't update/refresh.
I don't get an error in the console, but I do get the failure in the devtools.
I understand that Vue Router doesn't route back to a route you are already on, but I need it to. If you refresh the page when the url is just /analysis it routes back to it's inital state.
Is there anyway to refresh when it rereoutes to /analysis? Or a way to handle this error to work as intended?
What I've tried
I've tried changing the router-link to an <a> tag and programatically use router.push and then catch the error, but that doesn't do anything.
I've tried checking if the route.fullPath.contains("/analysis") and then just do router.back() but that doesn't seem to work either.
SidebarLink router function
function goToRoute() {
console.log(`route.fullPath → `, route.fullPath)
if (route.fullPath.match('/analysis*') as any) {
console.log('route includes /analysis')
router.back()
} else {
console.log('route doesnt inclue /analysis')
router
.push({
path: props.route,
})
.catch(() => {})
}
}
Inital /analysis Page
This is what the page looks like normally
/analysis/1 Page
This is what the route to analysis/1 looks like (url changes)
/analysis/1 Page When Issue Analysis SidebarLink Clicked
This is what the route to analysis looks like when the sidebarlink is clicked (url changes, but the page stays the same)
I suspect you are fetching your data from a backend service or data files
If yes you can refetch the data everytime the route param changed by watching it.
watch: {
'$route.params.id': function (id) {
if(id)
this.$store.dispatch('fetchOneAnalys', id)
else
this.$store.dispatch('fetchAllAnalyses')
}

Reevaluate Nuxt.js middleware without a route change

I'm wondering if it's possible to essentially "reevaluate" the middleware conditions without actually changing the current route.
The middleware's purpose is to prevent non-logged-in users from accessing the "dashboard".
My issue is, a user could become logged in or logged out without necessarily changing route but they wouldn't be redirected until they try and change pages.
I have a VueX action that triggers when the user's auth state changes but this (from what I can see), can't access the redirect or route variables.
// /mixins/auth.js
const reevaluateAuthStatus = (store, redirect, route) => {
console.log(route)
const redirectPolicy = route.meta.map((meta) => {
if (meta.auth && typeof meta.auth.redirectPolicy !== 'undefined') { return meta.auth.redirectPolicy[0] }
return []
})
const user = store.getters['auth/getUser']
if (redirectPolicy.includes('LOGGEDOUT')) {
if (user) {
return redirect('/dashboard')
}
} else if (redirectPolicy.includes('LOGGEDIN')) {
if (!user) {
return redirect('/login')
}
}
}
module.exports = {
reevaluateAuthStatus
}
// /middleware/auth.js
import { reevaluateAuthStatus } from '../mixins/auth'
export default function ({ store, redirect, route }) {
reevaluateAuthStatus(store, redirect, route)
}
Appreciate any help on this :)
You cannot re-evaluate a middleware AFAIK because it's mainly this (as stated in the documentation)
middlewares will be called [...] on the client-side when navigating to further routes
2 clean ways you can still achieve this IMO:
use some websockets, either with socket.io or something similar like Apollo Subscriptions, to have your UI taking into account the new changes
export your middleware logic to some kind of call, that you could trigger again by calling the $fetch hook again or any other data-related fetching hook in Nuxt
Some more ugly solutions would probably be:
making an internal setInterval and check if the actual state is still valid every 5s or so
move to the same page you are actually on with something like this.$router.go(0) as somehow explained in the Vue router documentation
Still, most of the cases I don't think that this one may be a big issue if the user is logged out, because he will just be redirected once he tries something.
As if the user becomes logged-in, I'm not even sure on which case this one can happen if he is not doing something pro-active on your SPA.
I don't know if it's relevant or not, but I solved a similar problem this way:
I have a global middleware to check the auth status. It's a function that receives Context as a parameter.
I have a plugin that injects itself into context (e.g. $middleware).
The middleware function is imported here.
In this plugin I define a method that calls this middleware passing the context (since the Plugin has Context as parameter as well): ctx.$middleware.triggerMiddleware = () => middleware(ctx);
Now the middleware triggers on every route change as intended, but I can also call this.$middleware.triggerMiddleware() everywhere I want.

How to handle navigation when removing the current page's Vuex record?

I have a ClientManagePage where I display client information and allow for the removal of the displayed client.
The vue-router route configuration for that page looks like this:
{
path: '/client/:id/manage',
name: 'client',
component: ClientManagePage,
props: ({ params }) => ({ id: params.id }),
}
The client entities are stored in a vuex store. ClientManagePage gets its client entity from the store using the id prop and displays various properties of the client and a "remove" button.
The remove button listener is (inside a mapActions):
async removeClientClicked(dispatch) {
// Wait for the action to complete before navigating to the client list
// because otherwise the ClientListPage might fetch the client list before
// this client is actually deleted on the backend and display it again.
await dispatch('removeClientAction', this.id);
this.$router.push({ name: 'clientList' });
},
The vuex action that removes a client is:
async function removeClientAction({ commit }, id) {
// Remove the client from the store first (optimistic removal)
commit('removeClient', id);
// Actually remove the client on the backend
await api.remove('clients', id);
// Moving "commit('removeClient', id);" here still produces the warning mentioned below
}
My problem is how to handle navigating to the other route when removing a client. The current code produces warnings in development mode such as:
[Vue warn]: Error in render: "TypeError: Cannot read property 'name' of undefined"
found in
---> <ClientManagePage> at src/pages/ClientManagePage.vue
<Root>
This is of course caused by the reactivity system kicking in and trying to update the content of the page with the now-deleted vuex client entity. This happens before the removeClientAction is completed therefore the navigation to the ClientList page.
I've come up with some possible solutions to this, but they are not very appealing:
Have a v-if="client" at the top of the ClientManagePage that hides everything while the client does not exist in the store.
Use the computed property client in ClientManagePage to return a default "dummy" client that contains the required properties for the page. The page will still flash with "fake" content while the action is underway though.
Navigate to "clientList" right after (or even before) dispatching removeClientAction. This causes the clientList to display the removed client briefly while the action completes which is not good.
Are there other solutions to this seemingly common problem of navigating away when deleting the underlying vuex entity displayed on the current page?
I ended up doing a big v-if at the top of the ClientManagePage that hides everything while the client does not exist in the store. It's not pretty, but it works. An improvement could be to display a "please wait, operation in progress" in v-else.
One option is to externalize the deletion of the record. There are a number of ways to do that, but the simplest for me was to create a new route, /records/delete/:id, and place a route guard on that route that triggers the removal. Then redirect to the records list where you wanted to go in the first place. Something along the lines of:
import store from "wherever/your/store/is";
const routes = [{
path: "/records/delete/:id",
name: "deleteRecord",
props: true,
beforeEnter: (to, from, next) => {
store.dispatch("DELETE_RECORD", to.params.id).then(() => console.log("record deleted!"));
next({name: "some/path/you/wanted/to/go/to"});
}
}, ...];

How to prevent user to leave page using middleware in Nuxt?

I got a Nuxt application, and in some special route, I want to prevent user from leaving the page by showing plain confirm javascript dialog.
I did some beforeRouteLeave <- this kinda thingy introduced in the Vue official documentation, but none of them seemed work in Nuxt.
And Nuxt recommends users to use middleware for doing this 'beforeRoute' things. Here's my code.
export default function (context) {
if (process.client &&
context.from.path.includes("board/write") &&
context.route.name !== "board-articleId") {
if (!confirm("Are you sure you want to leave the page?")) {
context.next(false)
}
}
}
As you can see, I'm checking if my current route is certain page (context.from.path...), ask user if user wants to leave the page. And if they canceled, which makes confirm as false, do
next(false)
and it works fine as it makes the user stay on the page.
But the problem is, the loading bar of the browser still loads even if the page doesn't change. And it looks like the route is still changing anyway despite the actual page doesn't change.
How can I prevent this to happen?
To make sure the address bar query (?bla=bla) not touched I recommend doing this:
export default function ({ from }) {
redirect(from);
}
I could have used
redirect(from.path)
instead of
next(false)
For the sake of information,
the incoming argument 'context' has some properties like below:
from, route, next, redirect...

Stop destroying vue.js component because there are unsaved changes

I am using Vue.js. I have a component where the user can save data. But it is possible that user has not saved the data and he tries to navigate to other route or destroy the component. I want to show a message that there is unsaved data and user really wants to leave it unsaved.
If the user says that he does not want to leave the unsaved data, then I have to stop navigation or component's destroying. I am using beforeDestroy to check if there is unsaved data and it works but I can not stop destroying the component or navigation. I tried using beforeRouteLeave but it does not work. Any ideas on how to make this work?
Hmm I see, are you sure using beforeRouteLeave in this manner
beforeRouteLeave (to, from , next) {
const answer = window.confirm('Do you really want to leave? you have unsaved changes!')
if (answer) {
next()
} else {
next(false)
}
}
key is next(false)
you need to pass false as argument in next() so it will not forward to next route.
just need to check if its correctly used.