Vue.js 3.0 Tutorial

Vue.js 3.0 Component Advanced

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Vue.js 3.0 Reusable & Combinable

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Vue.js 3.0 Style Guide

Vue 3.0 Style Guide

Vue 3.0 Mixins

Mixins in Vue are a flexible way to distribute reusable functionalities for Vue components. A mixin object can contain any component options. When a component uses a mixin, all options in the mixin will be ��mixed�� into the component��s own options.

Here's a basic example of how you can create and use a mixin:

// Define a mixin
const MyMixin = {
  data() {
    return {
      message: 'Hello from mixin!',
    };
  },
  methods: {
    greet() {
      console.log(this.message);
    },
  },
  created() {
    this.greet();
  },
};

// Create a component that uses the mixin
export default {
  mixins: [MyMixin],
};

In the above code, we first define a mixin called MyMixin. This mixin adds a data property message and a method greet to any component that uses it. It also calls greet when the component is created.

Then, we create a component that uses the mixin by adding it to the component's mixins option. This component will have the message data property and the greet method, and it will call greet when it's created.

Mixin Hooks

When a mixin and the component itself contain overlapping options, they will be ��merged�� using appropriate strategies. For example, data objects undergo a recursive merge, with the component��s data taking priority in cases of conflicts. Similarly, hooks (like created) do not override each other, but are called for both the mixin and the component.

const MyMixin = {
  created() {
    console.log('Mixin hook called');
  },
};

export default {
  mixins: [MyMixin],
  created() {
    console.log('Component hook called');
  },
};

In the above code, both created hooks will be called when the component is created, first the mixin's hook, then the component's hook.

Global Mixins

You can also apply a mixin globally. Be careful when you do this, because it affects every single Vue instance created, including third-party components.

import { createApp } from 'vue'
import App from './App.vue'

const app = createApp(App)

app.mixin({
  created() {
    console.log('Global mixin')
  },
})

app.mount('#app')

In the above code, the created hook from the global mixin will be called for every component in your application.

In conclusion, mixins can be very powerful for sharing functionality between components in Vue, but they should be used judiciously to avoid naming conflicts and other issues. Since the introduction of the Composition API in Vue 3, mixins are less often used, as the Composition API provides a more flexible and easier-to-understand way to share functionality between components.

Vue 3.0 Using Mixins in Components:

Utilize mixins to share reusable functionality across multiple components.

<!-- UsingMixins.vue -->
<template>
  <div>{{ mixinData }}</div>
</template>

<script>
export default {
  mixins: [myMixin],
  data() {
    return {
      mixinData: 'Data from mixin',
    };
  },
};

const myMixin = {
  data() {
    return {
      mixinData: 'Shared mixin data',
    };
  },
};
</script>

Vue 3.0 Advantages of Mixins:

Mixins offer code reuse, allowing you to share methods, data, and lifecycle hooks among multiple components.

<!-- MixinAdvantages.vue -->
<template>
  <div>{{ sharedMethod() }}</div>
</template>

<script>
export default {
  mixins: [myMixin],
};

const myMixin = {
  methods: {
    sharedMethod() {
      return 'Shared method from mixin';
    },
  },
};
</script>

Vue 3.0 Shared Functionality with Mixins:

Share common functionality such as methods and computed properties using mixins.

<!-- SharedFunctionality.vue -->
<template>
  <div>{{ computedProperty }}</div>
</template>

<script>
export default {
  mixins: [sharedMixin],
};

const sharedMixin = {
  computed: {
    computedProperty() {
      return 'Shared computed property';
    },
  },
};
</script>

Vue 3.0 Global Mixins Usage:

Apply global mixins to share functionality across all components.

// main.js
import { createApp } from 'vue';
import globalMixin from './globalMixin';

const app = createApp(App);
app.mixin(globalMixin);
app.mount('#app');

<!-- GlobalMixinUsage.vue -->
<template>
  <div>{{ globalMixinData }}</div>
</template>

<script>
export default {
  data() {
    return {
      localData: 'Local data',
    };
  },
};
</script>

// globalMixin.js
export default {
  data() {
    return {
      globalMixinData: 'Global mixin data',
    };
  },
};

Vue 3.0 Mixin Options and Lifecycle Hooks:

Define options and lifecycle hooks within mixins to extend component behavior.

<!-- MixinOptionsAndHooks.vue -->
<template>
  <div>{{ mixinData }}</div>
</template>

<script>
export default {
  mixins: [myMixin],
  created() {
    console.log('Component created');
  },
};

const myMixin = {
  data() {
    return {
      mixinData: 'Data from mixin',
    };
  },
  created() {
    console.log('Mixin created');
  },
};
</script>

Vue 3.0 Avoiding Conflicts in Mixins:

Prevent conflicts by carefully naming variables and avoiding naming collisions in mixins.

<!-- AvoidingMixinConflicts.vue -->
<template>
  <div>{{ componentData }}</div>
</template>

<script>
export default {
  mixins: [myMixin],
  data() {
    return {
      componentData: 'Component data',
    };
  },
};

const myMixin = {
  data() {
    return {
      mixinData: 'Mixin data',
    };
  },
};
</script>

Vue 3.0 Mixins vs Composition API:

Choose between mixins and the Composition API based on your preference and project requirements.

<!-- MixinsVsCompositionAPI.vue -->
<template>
  <div>{{ sharedFunction() }}</div>
</template>

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

export default {
  setup() {
    const sharedFunction = () => {
      return 'Shared functionality';
    };

    return {
      sharedFunction,
    };
  },
};
</script>

Vue 3.0 Creating and Applying Mixins:

Create mixins as separate modules and apply them to components.

// myMixin.js
export const myMixin = {
  data() {
    return {
      mixinData: 'Mixin data',
    };
  },
};

<!-- CreatingAndApplyingMixins.vue -->
<template>
  <div>{{ mixinData }}</div>
</template>

<script>
import { myMixin } from './myMixin';

export default {
  mixins: [myMixin],
};
</script>