current position:Home>Quickly understand Vue routing, navigation guard and in-depth analysis. [Award for comments]
Quickly understand Vue routing, navigation guard and in-depth analysis. [Award for comments]
2022-01-29 15:24:06 【Front end honest man】
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Navigation guard
Concept
“ Navigation ” Indicates that the route is changing
vue-router The navigation guard provided is mainly used to guard the navigation by jumping or canceling . There are many opportunities to implant the routing navigation process in : Overall , Single route exclusive , Or component level .
Navigation guard : Include Global navigation guard and Local navigation guard
Global guard
vue-router There are three guards
- router.beforeEach : Front guard of the whole situation , Before entering the route
- router.beforeResolve : Global analysis guard , stay beforeRouteEnter Call after call ( Not commonly used )
- router.afterEach : Global post hook , After entering the route
Front guard of the whole situation
You can use router.beforeEach Register a global front guard :
const router = new VueRouter({ ... })
router.beforeEach((to, from, next) => {
// to and from All are routing instances
// to: Route to jump to
// from: Now the route to leave
// next: function
})
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- next: Function : Be sure to call this method resolve This hook . Execution depends on next Method call parameters .
- next() : Go to the next hook in the pipe . If all the hooks are finished , The state of navigation is confirmed ( Confirmed ).
- next(false) : Interrupt current navigation . If the browser's URL Changed the ( It may be the user's manual or browser Back button ), that URL Address will be reset to from The address corresponding to the route .
- next('/') perhaps next({ path: '/' }) : Jump to a different address . The current navigation is interrupted , Then take a new navigation . You can go to next Passing objects anywhere , And allow settings such as replace: true 、 name: 'home' Options like that, and anything that's used in router-link Of to prop or router.push Options in .
- next(error) : (2.4.0+) If you pass in next The parameter of is a Error example , The navigation will be terminated and the error will Be passed on to router.onError() Registered callbacks .
Be careful : If it is next('/') perhaps next({ path: '/' }), Just bring the path to release , Then there must be judgment , stay
When to release him , Or he'll keep cycling .
Global analysis guard
2.5.0 newly added
// Global analysis guard
router.beforeResolve((to,from.next) => { })
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stay 2.5.0+ You can use it. router.beforeResolve Sign up for a global guard . This sum router.beforeEach similar , District
Not before the navigation is confirmed , At the same time, after guard and asynchronous routing components in all components are resolved , Parse guard is called .
Global post hook
You can also register the global post hook , But unlike guards , These hooks won't accept next Functions do not change the navigation itself :
// Global post hook
router.afterEach((to,form) => { })
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because :afterEach When called , Route jump completed , So no need next function
Route exclusive guard
If you don't want to configure routing globally , Some routes can be configured separately
such as : to mainpage The page is configured separately
{
path: '/mainpage',
name: 'About',
component: About, // Route exclusive guard
beforeEnter:(to,from,next) => {
if(from.name === '/mainpage/about'){ alert(" This is from about To the ")
}else{
alert(" This is not from about To the ")
}next(); // Must be called for the next operation . Otherwise it won't jump
}
}
},
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The guards in the component
Last , You can directly define the following route navigation guards in the route component :
- beforeRouteEnter(): Before entering the route
- beforeRouteUpdate(): When routes reuse the same component
- beforeRouteLeave(): When leaving the current route
stay Product For example
// Global analysis guard
router.beforeResolve((to,from.next) => {
})
// Global post hook
router.afterEach((to,form) => {
})
{
path: '/mainpage',
name: 'About',
component: About,
// Route exclusive guard
beforeEnter:(to,from,next) => {
if(from.name === '/mainpage/about'){
alert(" This is from about To the ")
}else{
alert(" This is not from about To the ")
}
next(); // Must be called for the next operation . Otherwise it won't jump
}
}
},
export default {
// Guard inside the assembly beforeRouteUpdate The trigger condition is : The current route changes , But when the component is reused .
for instance :product/orders To product/cart This route , It's all reused Product.vue This component , This is the time
beforeRouteUpdate Will be triggered . Can be obtained this example .
A complete navigation analysis process
// Because when this hook is called , The component instance has not been created yet , So you can't get this
beforeRouteEnter (to, from, next) {
console.log(to.name);
// If you want to get an instance
// next(vm=>{
// // there vm Is an instance of a component (this)
// });
next();
},
beforeRouteUpdate(to,from,next){
console.log(to.name, from.name);
next();
},
// This method is called when the route is about to leave
// for instance , The user edited something , But it hasn't been saved yet , At this time, he will leave this page , Just remind him , Not yet
save , Whether to leave
beforeRouteLeave (to, from, next) {
const leave = confirm(" Are you sure you want to leave ?");
if(leave) next() // Leave
else next(false) // Don't leave
},
}
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- beforeRouteUpdate The trigger condition is : The current route changes , But when the component is reused .
- for instance :product/orders To product/cart This route , It's all reused Product.vue This component , This is the time
- beforeRouteUpdate Will be triggered . Can be obtained this example .
A complete navigation analysis process
1、 Navigation is triggered .
2、 In the inactivated components ( About to leave the page component ) Inside call leave guard . beforeRouteLeave
3、 Call global beforeEach The guards .
4、 Called in a reused component beforeRouteUpdate The guards (2.2+).
5、 Call... In routing configuration ( Route exclusive guard ) beforeEnter.
6、 Resolve asynchronous routing components
7、 In the activated component ( About to enter the page component ) Call inside beforeRouteEnter.
8、 Call global beforeResolve The guards (2.5+).
9、 Navigation confirmed .
10、 Call global afterEach hook . All the hooks are triggered .
11、 Trigger DOM to update .
12、 Call... With the created instance beforeRouteEnter Pass it to next Callback function for .
Last
If it helps you , I hope I can give you a comment collection for three times !
I'm an honest man , Answer questions free of charge , Welcome to Xiaobian's circle of friends !
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