**Course Title:** Mastering Vue.js: Building Modern Web Applications **Section Title:** Vue Router: Building SPAs **Topic:** Dynamic routing and route parameters **Introduction** In the previous topic, we set up routes and nested routes using Vue Router. However, in real-world applications, routes often need to be dynamic, and parameters need to be passed between routes. In this topic, we will cover dynamic routing and route parameters in Vue Router. **What is Dynamic Routing?** Dynamic routing is a technique where routes are generated dynamically based on certain conditions or parameters. In Vue Router, dynamic routing is achieved using route parameters. Route parameters are values that are passed between routes and can be used to determine the route's behavior. **Defining Dynamic Routes** To define dynamic routes in Vue Router, you can add route parameters to your route definitions. Route parameters are denoted by colons (`:`) in the route path. For example: ```javascript const routes = [ { path: '/users/:id', name: 'user', component: UserComponent } ] ``` In this example, the `:id` is a route parameter that will be passed to the `UserComponent`. **Accessing Route Parameters** To access route parameters in your Vue components, you can use the `$route` object. The `$route` object contains an `params` property that holds the route parameters. For example: ```javascript // UserComponent.vue export default { mounted() { console.log(this.$route.params.id) // prints the id parameter } } ``` **Using Route Parameters in Component Templates** You can also use route parameters in your component templates using the `v-text` or `v-html` directives. For example: ```html <!-- UserComponent.vue --> <template> <div> <h1>{{ $route.params.id }}</h1> </div> </template> ``` **Route Parameter Validation** You can validate route parameters using regular expressions or validation functions. For example: ```javascript const routes = [ { path: '/users/:id(\\d+)', name: 'user', component: UserComponent } ] ``` In this example, the `:id(\\d+)` parameter will only match if the id is a number. **Optional Route Parameters** You can also define optional route parameters using the `?` character. For example: ```javascript const routes = [ { path: '/users/:id?', name: 'user', component: UserComponent } ] ``` In this example, the `:id` parameter is optional. **Conclusion** Dynamic routing and route parameters are powerful features in Vue Router that allow you to build flexible and robust single-page applications. By defining dynamic routes and accessing route parameters in your components, you can create complex and dynamic routing scenarios. **Practical Takeaways** * Use route parameters to pass values between routes. * Access route parameters using the `$route` object. * Validate route parameters using regular expressions or validation functions. * Use optional route parameters to define flexible routing scenarios. **Additional Resources** * [Vue Router Documentation: Dynamic Route Matching](https://router.vuejs.org/guide/essentials/dynamic-matching.html) * [Vue Router Documentation: Parameter Validation](https://router.vuejs.org/guide/essentials.parameter-validation.html) **What's Next?** In the next topic, we will cover navigation guards for route protection. Navigation guards allow you to protect routes from unauthorized access and execute logic before and after route navigation. **Leave a Comment or Ask for Help** If you have any questions or need help with dynamic routing and route parameters, please leave a comment below.