Vue.js 3.0 Tutorial

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Vue 3.0 Style Guide

Vue 3.0 Composite API Setup

The Composition API in Vue 3.0 is a new way to write and manage your Vue.js components. It provides a more flexible way to reuse and organize code in large Vue applications. The Composition API is introduced alongside the existing Options API, and it doesn't replace the latter. You can use both in the same application depending on what suits your needs better.

To use the Composition API, you'll use a setup method in your component, which serves as the entry point for the API. Below is a simple example of a Vue 3.0 application that uses the Composition API's setup method.

Firstly, let's create a new Vue 3 project using the Vue CLI:

vue create my-project

Select Vue 3 when asked which version of Vue to use.

In your App.vue file, you could create a component that displays a message, and the message can be changed by clicking a button.

<template>
  <div>
    <p>{{ message }}</p>
    <button @click="changeMessage">Change Message</button>
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const message = ref('Hello, Vue 3!');

    const changeMessage = () => {
      message.value = 'Message changed!';
    };

    return {
      message,
      changeMessage
    };
  },
};
</script>

In the setup function, we've defined message using the ref function from vue, which makes it a reactive variable. The changeMessage function changes the message when it's called.

These are returned from the setup function, which means they will be available in the template of this component.

Finally, run your Vue 3 application:

npm run serve

Now, if you open the page in your browser, you'll see the message "Hello, Vue 3!". Clicking the button changes it to "Message changed!".

This is a simple example of how to use the Composition API's setup method in Vue 3.0. It provides a way to manage and organize your component's logic in a more flexible manner.

Vue 3.0 Composition API Installation Steps:
- Description: Install the Composition API by including the @vue/composition-api package.
- Code Example: Run the following command in your project directory:
```
npm install @vue/composition-api
```

Initializing Composition API in Vue 3.0:

Description: Initialize the Composition API in your main file (e.g., main.js).

Code Example:

// main.js
import { createApp } from 'vue';
import VueCompositionAPI from '@vue/composition-api';
import App from './App.vue';

const app = createApp(App);
app.use(VueCompositionAPI);
app.mount('#app');

Getting Started with Vue 3.0 Composition API Setup:

Description: Start using the Composition API in your components.

Code Example:

<!-- MyComponent.vue -->
<template>
  <div>{{ message }}</div>
</template>

<script>
import { ref } from '@vue/composition-api';

export default {
  setup() {
    const message = ref('Hello, Vue 3.0 Composition API!');
    return {
      message,
    };
  },
};
</script>