How to watch and react to params changes in Vue.js

In this tutorial, you’ll learn how to react to params changes in the same component.

For example, you have a /products/google-glass route that uses a Product.vue component. It’s a reusable component, that loads product information from the backend server for a selected product.

Your goal is to make this component react to params changes, e.g. when you open /products/ps4 it should load information about PlayStation 4.

Reacting to params changes in Vue.js

watch: {
  '$route' () {
    this.loadProduct()
  }
}

We can react to params changes by watching the $route object.

This way we can load product information when the route changes. We simply call a loadProduct() method whenever the route changes.

The loadProduct() method will make an API call by sending product slug or id to the backend server:

this.$store.dispatch('LOAD_PRODUCT', { product: this.$route.params.product })

If you find this post useful, please let me know in the comments below. 
Cheers,
Renat Galyamov

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PS: Make sure you check other Vue.js tutorials, e.g. Top 5 CSS frameworks for your Vue.js project (2019), Vue.js custom watchers or how to return a promise from Vuex action in Vue.js.