Composition Api Watch

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One of the major benefits to the new Composition API in Vue 3 is how it provides a flexible and powerful reactivity system to developers.

With Vue 2, developers were reliant on the Options API to build single-file components, which enforced a level of structure to how the system was used.

The Composition API, on the other hand, gives the developer new opportunities to build reactive applications.

In a previous article, we explored the difference between ref and reactive methods.

Let's build on that understanding, and introduce two new methods from the Composition API - watch and watchEffect.

The Options API provided us with the watch option, which is a way to observe when values changed and perform side effects based on that.

Boussadjra Brahim
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Let's summarize what's going on here:. In our template, we have a textarea that is bound to our data value of notes.

In our Javascript, we have a watch key, which takes an object. In that object, we have a function, also called notes. This function will be automatically called whenever the value of notes changes (for example, when text is entered into the field).

Boussadjra BrahimBoussadjra Brahim
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For further reading on watchers with the Options API, here's a link to the documentation for Vue 2.

  1. Now that we have a basic understanding of watchers in the Options API, let's dive into the Composition API!
  1. The Composition API provides us with two different methods to handle side effects - watch and watchEffect.
Just like with ref and reactive, these methods are not meant to compete with each other, but to be used as required by the application.

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