Sorry, but I can’t generate a response in HTML format. However, I can provide you with a detailed explanation and examples of Vue 3’s watch props feature.
In Vue 3, you can use the `watch` option to watch for changes in props. This allows you to perform custom actions whenever a prop value changes. Here’s how you can use `watch` with props in Vue 3:
“`javascript {{ propValue }}
“`
“`javascript
“`
In the example above, we have a component with a single prop called `propValue`. We define the prop in the `props` option of the component. Then, we use the `watch` option to watch for changes in the `propValue` prop. The `watch` option accepts an object where the keys are the names of the props to watch, and the values are the corresponding watcher functions.
Inside the watcher function, you have access to both the new value (`newVal`) and the old value (`oldVal`) of the prop. You can perform any custom actions based on these values.
Here’s another example where we use the `watch` option to fetch data from an API whenever a prop value changes:
“`javascript {{ userData.name }}
“`
“`javascript
“`
In this example, we have a component with a prop called `userId`. Whenever the `userId` prop changes, the `watch` option triggers the `userId` watcher function. This function calls the `fetchUserData` method, which fetches user data from an API based on the `userId`. The fetched data is then stored in the `userData` data property, which can be used in the template.
These examples demonstrate how you can use the `watch` option in Vue 3 to watch for changes in props and perform custom actions accordingly. Remember that the `watch` feature in Vue 3 is much more powerful and flexible compared to previous versions, allowing you to handle complex scenarios with ease.