vue route parsing process

Vue.js is a popular, flexible front-end framework whose strengths lie in its lightweight, easy to learn and use, and flexibility. Among them, Vue's routing management is extremely popular among developers, as it makes application routing management simple and flexible. In this article, we’ll take an in-depth look at the Vue route resolution process.

Vue routing basics

Before talking about Vue routing, we first need to know what routing is. When we access a web application, a part of the URL is called a route. For example, when accessing a Twitter page, the actual URL accessed might be http://twitter.com/home. In this case, the route is /home. Routes are very important for web applications because they provide us with a convenient way to tie a part of the interface to a specific URL.

Vue’s routing is managed by Vue Router. Vue Router is the official routing manager for Vue.js, a web application routing manager based on Vue.js. Vue Router allows developers to freely and efficiently manage all routes in their applications.

The implementation principle of Vue Router

The implementation principle of Vue Router relies on the routing mechanism that comes with the browser. After the browser obtains a URL, it will parse the URL and then request the server data. However, in actual development, server processing may take a lot of time, which will cause users to wait for too long. To avoid this and improve user experience, we can use front-end routing to update the URL on the client side and load the corresponding data through JavaScript without refreshing the page.

Vue route resolution process

Vue’s route resolution includes the following three steps:

1. Route matching

Vue Router is very flexible in route matching . It can match any component based on the URL, which can be a page component belonging to the same level or a sub-component belonging to a nested route.

Route matching is configured through the routes property of the Vue Router instance. Each RouteConfig object describes a route, including the path and component of the route, which represent the component corresponding to this route.

Route matching is completed before the Vue instance is created. When we enter a URL in the browser, Vue Router will look for the path attribute in the URL, and if it matches, associate it with the corresponding routing configuration. If no match is found, a routing error will be triggered.

2. Route Guard

After route matching is completed, Vue Router will trigger the route guard. A route guard is a function that is executed before each route switch.

Route guards can be used to check whether users have access rights, protect routes, etc. Vue Router provides five types of route guards:

• Global front guardbeforeEach
• Global post hookafterEach
• Route exclusive guardbeforeEnter
• Route guard within the componentbeforeRouteEnter, beforeRouteUpdate, beforeRouteLeave

The execution order of route guards is global front guard, route exclusive guard, route guard within component, and global post hook.

3. Component rendering

After route matching and route guarding have been completed, Vue Router renders the component into the view. Vue Router provides the router-view component, which is used to render components matched by routes.

When routing is switched, Vue Router will render the new component and destroy the old component. This behavior is very efficient because Vue can optimize component rendering and only re-render the changed parts, reducing performance loss.

Conclusion

Vue routing is the routing manager of Vue.js, implemented based on the routing mechanism that comes with the browser. Route parsing includes three steps: route matching, route guarding, and component rendering. Vue Router provides a high degree of playability and flexibility. Mastering the parsing of Vue routes can help optimize application routing management and improve user usability.

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