How to use Vue.observable to create observable objects in Vue

Vue is a popular JavaScript framework that provides many features, including observable objects. An Observable is a reactive object that notifies all components and properties that depend on it when it changes. Vue.observable is a function used to create observable objects. This article will introduce the implementation method and common scenarios of Vue.observable.

1. Basic usage of Vue.observable

First of all, using Vue.observable in Vue requires the introduction of the Vue.js file. The method of using Vue.observable is very simple. You only need to call the Vue.observable function in the Vue instance and pass in the object you want to create.

For example, we can create an observable object in the following way:

import Vue from 'vue';

const observableObj = Vue.observable({ 
  count: 0 
});

The object created in Vue.observable will have responsive capabilities and will automatically update when its properties change. and refresh components that depend on it.

For example, use this object in a component:

<template>
  <div>
    {{ count }}
    <button @click="increment">+1</button>
  </div>
</template>

<script>
import { observableObj } from './path/to/observable.js';

export default {
  computed: {
    count() {
      return observableObj.count;
    }
  },
  methods: {
    increment() {
      observableObj.count++;
    }
  }
};
</script>

At this time, when the user clicks the button, the count property of the observable object is automatically updated, and the calculation of this property is used in the component Properties are also updated and refreshed automatically.

2. Advanced usage of Vue.observable

In Vue.observable, we can not only create simple objects, but also create arrays or nested objects as responsive data. When creating an observable object, only directly accessed properties or objects will be reactive.

For example, in the following code, we create an observable object containing nested objects and reactive arrays:

const observableObj = Vue.observable({
  nestedObj: {
    message: 'Hello, world!'
  },
  
  items: ['jacket', 'shirt', 'pants'],

  addItem(item) {
    this.items.push(item);
  }
});

In the component, we can use calculated properties or methods to access These objects and arrays:

<template>
  <div>
    <p>{{ message }}</p>
    <ul>
      <li v-for="item in items" :key="item">{{ item }}</li>
    </ul>
    <button @click="addItem('shoes')">Add Item</button>
  </div>
</template>

<script>
import { observableObj } from './path/to/observable.js';

export default {
  computed: {
    message() {
      return observableObj.nestedObj.message;
    },
    items() {
      return observableObj.items;
    }
  },
  methods: {
    addItem(item) {
      observableObj.addItem(item);
    }
  }
};
</script>

In this example, we use computed properties and methods to access nested objects and reactive arrays respectively. When new items are added, the array in the component will automatically update and refresh.

3. Conclusion

Vue.observable is a very useful feature in the Vue framework. It provides a simple way to create observable objects. Just use the Vue.observable function to create an object with responsive capabilities. When the object is used in a component, it will automatically update and refresh the components and properties that depend on it. By understanding the usage of Vue.observable, you can more easily create reactive data in Vue applications.

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