### Using a Vue.js Plugin

Source: https://v2.vuejs.org/v2/guide/plugins

Demonstrates how to install a Vue.js plugin globally before initializing the Vue application. It also shows how to pass options to the plugin and explains that Vue.use() prevents duplicate installations.

```APIDOC
## Using a Vue.js Plugin

### Description
Use plugins by calling the `Vue.use()` global method. This has to be done before you start your app by calling `new Vue()`.

### Method
`Vue.use(MyPlugin, [options])`

### Example (Basic Usage)
```javascript
// calls `MyPlugin.install(Vue)`
Vue.use(MyPlugin)

new Vue({
  //... options
})
```

### Example (With Options)
```javascript
Vue.use(MyPlugin, { someOption: true })
```

### Note
`Vue.use` automatically prevents you from using the same plugin more than once. In a module environment (like CommonJS), you always need to call `Vue.use()` explicitly.
```

--------------------------------

### Using Vue.js Plugins

Source: https://v2.vuejs.org/v2/guide/plugins

Demonstrates how to install a Vue.js plugin globally using `Vue.use()`. It shows the basic usage and how to pass options to the plugin. It also covers explicit installation in module environments.

```javascript
Vue.use(MyPlugin)

new Vue({
  //... options
})
```

```javascript
Vue.use(MyPlugin, { someOption: true })
```

```javascript
var Vue = require('vue')
var VueRouter = require('vue-router')

Vue.use(VueRouter)
```

--------------------------------

### Vue.js CSS Transitions Example

Source: https://v2.vuejs.org/v2/guide/transitions

Demonstrates using Vue's `<transition>` component with CSS classes for enter and leave animations. It includes the Vue instance setup, the HTML structure, and the CSS defining the transition effects.

```html
<div id="example-1">
  <button @click="show = !show">
    Toggle render
  </button>
  <transition name="slide-fade">
    <p v-if="show">hello</p>
  </transition>
</div>
```

```javascript
new Vue({
  el: '#example-1',
  data: {
    show: true
  }
})
```

```css
/* Enter and leave animations can use different */
/* durations and timing functions.              */
.slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active below version 2.1.8 */ {
  transform: translateX(10px);
  opacity: 0;
}
```

--------------------------------

### Vue App Initialization

Source: https://v2.vuejs.org/v2/cookbook/practical-use-of-scoped-slots

Standard Vue.js application setup, configuring the Vue instance and mounting it to the DOM. This is the entry point for the Vue application.

```javascript
// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from "vue";
import App from "./App";

Vue.config.productionTip = false;

/* eslint-disable no-new */
new Vue({
  el: "#app",
  components: { App },
  template: "<App/>"
});
```

--------------------------------

### Complete Todo List Example with Vue.js Components

Source: https://v2.vuejs.org/v2/guide/list

A full Vue.js application example demonstrating a todo list. It includes component registration, data management, event handling for adding and removing todos, and conditional rendering within the component template.

```html
<div id="todo-list-example">
  <form v-on:submit.prevent="addNewTodo">
    <label for="new-todo">Add a todo</label>
    <input
      v-model="newTodoText"
      id="new-todo"
      placeholder="E.g. Feed the cat"
    >
    <button>Add</button>
  </form>
  <ul>
    <li
      is="todo-item"
      v-for="(todo, index) in todos"
      v-bind:key="todo.id"
      v-bind:title="todo.title"
      v-on:remove="todos.splice(index, 1)"
    ></li>
  </ul>
</div>
```

```javascript
Vue.component('todo-item', {
  template: '\
    <li>\
      {{ title }}
      <button v-on:click="$emit(\'remove\')">Remove</button>
    </li>\
  ',
  props: ['title']
})

new Vue({
  el: '#todo-list-example',
  data: {
    newTodoText: '',
    todos: [
      {
        id: 1,
        title: 'Do the dishes',
      },
      {
        id: 2,
        title: 'Take out the trash',
      },
      {
        id: 3,
        title: 'Mow the lawn'
      }
    ],
    nextTodoId: 4
  },
  methods: {
    addNewTodo: function () {
      this.todos.push({
        id: this.nextTodoId++,
        title: this.newTodoText
      })
      this.newTodoText = ''
    }
  }
})
```

--------------------------------

### HTML Structure for Animated Integer

Source: https://v2.vuejs.org/v2/guide/transitioning-state

Sets up the HTML for an example demonstrating animated integer transitions. Includes input fields and placeholders for animated values.

```html
<script src="https://cdn.jsdelivr.net/npm/tween.js@16.3.4"></script>  
  
<div id="example-8">  
  <input v-model.number="firstNumber" type="number" step="20"> +  
  <input v-model.number="secondNumber" type="number" step="20"> =  
  {{ result }}  
  <p>  
    <animated-integer v-bind:value="firstNumber"></animated-integer> +  
    <animated-integer v-bind:value="secondNumber"></animated-integer> =  
    <animated-integer v-bind:value="result"></animated-integer>  
  </p>  
</div>  


```

--------------------------------

### Install Vue.js via NPM

Source: https://v2.vuejs.org/v2/guide/installation

This command installs the latest stable version of Vue.js (v2) using NPM. This is the recommended installation method for large-scale applications, especially when used with module bundlers like Webpack or Browserify.

```bash
# latest stable
$ npm install vue@^2
```

--------------------------------

### Initialize Vue TypeScript Project

Source: https://v2.vuejs.org/v2/guide/typescript

Commands to install the Vue CLI and generate a new project with manual feature selection to enable TypeScript support.

```bash
npm install --global @vue/cli
vue create my-project-name
```

--------------------------------

### Serve Vue CLI Application

Source: https://v2.vuejs.org/v2/cookbook/debugging-in-vscode

Start your Vue.js application using Vue CLI in the terminal to prepare for debugging.

```bash
npm run serve
```

--------------------------------

### Initializing Reactive Properties

Source: https://v2.vuejs.org/v2/guide/instance

Shows how to define initial values for properties that might be added later to ensure they are reactive from the start. Properties not present initially are not reactive.

```javascript
data: {
  newTodoText: '',
  visitCount: 0,
  hideCompletedTodos: false,
  todos: [],
  error: null
}
```

--------------------------------

### Naming Base Components with Prefixes

Source: https://v2.vuejs.org/v2/style-guide

Provides examples of naming base or presentational components using consistent prefixes like 'Base', 'App', or 'V' to improve discoverability and organization.

```text
components/
|- BaseButton.vue
|- BaseTable.vue
|- BaseIcon.vue
```

--------------------------------

### Demonstrating Slots vs Children

Source: https://v2.vuejs.org/v2/guide/render-function

An example showing the structural difference between children and named slots in a functional component context.

```html
<my-functional-component>  
  <p v-slot:foo>  
    first  
  </p>  
  <p>second</p>  
</my-functional-component>
```

--------------------------------

### Install ButterCMS SDK for Vue.js

Source: https://v2.vuejs.org/v2/cookbook/serverless-blog

This snippet shows how to install the ButterCMS SDK using npm. This is the first step to integrate ButterCMS into your Vue.js project.

```bash
npm install buttercms --save
```

--------------------------------

### Multi-Target Build Configuration in package.json

Source: https://v2.vuejs.org/v2/cookbook/packaging-sfc-for-npm

An example package.json configuration using Rollup to generate UMD, ESM, and IIFE builds in a single command, including necessary devDependencies.

```json
{
  "name": "my-component",
  "version": "1.2.3",
  "main": "dist/my-component.umd.js",
  "module": "dist/my-component.esm.js",
  "unpkg": "dist/my-component.min.js",
  "browser": {
    "./sfc": "src/my-component.vue"
  },
  "scripts": {
    "build": "npm run build:umd & npm run build:es & npm run build:unpkg",
    "build:umd": "rollup --config build/rollup.config.js --format umd --file dist/my-component.umd.js",
    "build:es": "rollup --config build/rollup.config.js --format es --file dist/my-component.esm.js",
    "build:unpkg": "rollup --config build/rollup.config.js --format iife --file dist/my-component.min.js"
  },
  "devDependencies": {
    "rollup": "^1.17.0",
    "@rollup/plugin-buble": "^0.21.3",
    "@rollup/plugin-commonjs": "^11.1.0",
    "rollup-plugin-vue": "^5.0.1",
    "vue": "^2.6.10",
    "vue-template-compiler": "^2.6.10"
  }
}
```

--------------------------------

### Implement and Resize SVG Icons

Source: https://v2.vuejs.org/v2/cookbook/editable-svg-icons

Examples of how to consume the IconBase component within a parent component and how to dynamically adjust icon dimensions using props.

```html
<!-- Basic usage -->
<icon-base icon-name="write"><icon-write /></icon-base>

<!-- Resizing examples -->
<p>
  <icon-base width="12" height="12" icon-name="write"><icon-write /></icon-base>
  <icon-base icon-name="write"><icon-write /></icon-base>
  <icon-base width="30" height="30" icon-name="write"><icon-write /></icon-base>
</p>
```

--------------------------------

### Multiple Component Imports in Modules

Source: https://v2.vuejs.org/v2/guide/components-registration

Example of importing and registering multiple components within a single parent component file using a module system.

```javascript
import ComponentA from './ComponentA';
import ComponentC from './ComponentC';

export default {
  components: {
    ComponentA,
    ComponentC
  }
};
```

--------------------------------

### Using a Base Component with Manual Attribute Binding

Source: https://v2.vuejs.org/v2/guide/components-props

Provides an example of using a base component that has manual attribute binding configured, allowing it to be used like a raw HTML element.

```html
<base-input
  label="Username:"
  v-model="username"
  required
  placeholder="Enter your username"
></base-input>
```

--------------------------------

### Vue.js Directive Shorthands

Source: https://v2.vuejs.org/v2/guide/syntax

Provides examples of the shorthand syntax for v-bind and v-on directives, including support for dynamic arguments.

```html
<!-- full syntax -->
<a v-bind:href="url"> ... </a>

<!-- shorthand -->
<a :href="url"> ... </a>

<!-- shorthand with dynamic argument (2.6.0+) -->
<a :[key]="url"> ... </a>
```

--------------------------------

### Writing a Vue.js Plugin

Source: https://v2.vuejs.org/v2/guide/plugins

Illustrates the structure of a Vue.js plugin by defining the `install` method. This method can be used to add global methods, global assets like directives, component options via mixins, or instance methods.

```javascript
MyPlugin.install = function (Vue, options) {
  // 1. add global method or property
  Vue.myGlobalMethod = function () {
    // some logic ...
  }

  // 2. add a global asset
  Vue.directive('my-directive', {
    bind (el, binding, vnode, oldVnode) {
      // some logic ...
    }
    ...
  })

  // 3. inject some component options
  Vue.mixin({
    created: function () {
      // some logic ...
    }
    ...
  })

  // 4. add an instance method
  Vue.prototype.$myMethod = function (methodOptions) {
    // some logic ...
  }
}
```

--------------------------------

### Render Function Basic Usage

Source: https://v2.vuejs.org/v2/guide/render-function

A simple example demonstrating how to render an H1 element with dynamic content using the createElement function.

```javascript
render: function (createElement) {
  return createElement('h1', this.blogTitle)
}
```

--------------------------------

### Create Simple Dockerfile for Vue.js

Source: https://v2.vuejs.org/v2/cookbook/dockerize-vuejs-app

Defines a Dockerfile that installs dependencies, builds the Vue.js application, and serves it using a simple HTTP server. This is suitable for prototyping and local development.

```dockerfile
FROM node:lts-alpine
RUN npm install -g http-server
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build
EXPOSE 8080
CMD [ "http-server", "dist" ]
```

--------------------------------

### Complete HTML with Styling

Source: https://v2.vuejs.org/v2/cookbook/creating-custom-scroll-directives

This is a complete HTML structure including the Vue app, the scrollable element, and necessary CSS for styling and transitions. It sets up the page for the scroll directive example.

```html
<div id="app">
  <h1 class="centered">Scroll me</h1>
  <div class="box" v-scroll="handleScroll">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. A atque amet harum aut ab veritatis earum porro praesentium ut corporis. Quasi provident dolorem officia iure fugiat, eius mollitia sequi quisquam.</p>
  </div>
</div>
```

--------------------------------

### Vue Component Wrapper for Auto-Installation

Source: https://v2.vuejs.org/v2/cookbook/packaging-sfc-for-npm

A wrapper script that exports a Vue component and provides an install function, allowing it to be registered automatically when loaded via a script tag or imported as a module.

```javascript
import component from './my-component.vue';

export function install(Vue) {
	if (install.installed) return;
	install.installed = true;
	Vue.component('MyComponent', component);
}

const plugin = {
	install,
};

let GlobalVue = null;
if (typeof window !== 'undefined') {
	GlobalVue = window.Vue;
} else if (typeof global !== 'undefined') {
	GlobalVue = global.Vue;
}
if (GlobalVue) {
	GlobalVue.use(plugin);
}

export default component;
```

--------------------------------

### Compiled Vue Directive and Instance

Source: https://v2.vuejs.org/v2/cookbook/creating-custom-scroll-directives

This code combines the custom 'scroll' directive definition with the Vue instance setup. It's the executable JavaScript for the scroll behavior example.

```javascript
Vue.directive('scroll', {
  inserted: function(el, binding) {
    let f = function(evt) {
      if (binding.value(evt, el)) {
        window.removeEventListener('scroll', f);
      }
    };
    window.addEventListener('scroll', f);
  },
});

// main app
new Vue({
  el: '#app',
  methods: {
   handleScroll: function(evt, el) {
    if (window.scrollY > 50) {
      el.setAttribute("style", "opacity: 1; transform: translate3d(0, -10px, 0)")
    }
    return window.scrollY > 100;
    }
  }
});
```

--------------------------------

### Initialize ButterCMS with API Token (CDN)

Source: https://v2.vuejs.org/v2/cookbook/serverless-blog

This snippet shows how to initialize the ButterCMS client using the globally available Butter object after loading it via CDN. This is useful for simple setups or when not using module bundlers.

```javascript
<script src="https://cdnjs.buttercms.com/buttercms-1.1.0.min.js"></script>
<script>
  var butter = Butter('your_api_token');
</script>
```

--------------------------------

### Using the Custom 'clipscroll' Directive in a Vue Template

Source: https://v2.vuejs.org/v2/cookbook/creating-custom-scroll-directives

This example shows how to apply the custom 'clipscroll' directive to an SVG path element within a Vue template. It passes an object containing 'start', 'end', and 'toPath' values as arguments to the directive, controlling the scroll-triggered morphing animation.

```html
<clipPath id="clip-path">
  <path
    v-clipscroll="{ start: '50', end: '100', toPath: 'M0.39 0.34H15.99V22.44H0.39z' }"
    id="poly-shapemorph"
    d="M12.46 20.76L7.34 22.04 3.67 18.25 5.12 13.18 10.24 11.9 13.91 15.69 12.46 20.76z"
  />
</clipPath>
```

--------------------------------

### Create Vue Instance

Source: https://v2.vuejs.org/v2/guide/instance

Demonstrates the basic syntax for creating a new Vue instance using the `Vue` constructor and passing an options object.

```javascript
var vm = new Vue({
  // options
})
```

--------------------------------

### Implementing v-on Event Handling

Source: https://v2.vuejs.org/v2/api

Demonstrates basic usage of v-on, including method handlers, inline statements, dynamic events, and the @ shorthand syntax.

```html
<!-- method handler -->
<button v-on:click="doThis"></button>

<!-- dynamic event -->
<button v-on:[event]="doThis"></button>

<!-- inline statement -->
<button v-on:click="doThat('hello', $event)"></button>

<!-- shorthand -->
<button @click="doThis"></button>

<!-- shorthand dynamic event -->
<button @[event]="doThis"></button>
```

--------------------------------

### Vue.js Custom Transition Classes Example

Source: https://v2.vuejs.org/v2/guide/transitions

Shows how to apply custom CSS classes for transitions using `enter-active-class` and `leave-active-class` attributes on the `<transition>` component. This example integrates with the Animate.css library.

```html
<link href="https://cdn.jsdelivr.net/npm/animate.css@3.5.1" rel="stylesheet" type="text/css">

<div id="example-3">
  <button @click="show = !show">
    Toggle render
  </button>
  <transition
    name="custom-classes-transition"
    enter-active-class="animated tada"
    leave-active-class="animated bounceOutRight"
  >
    <p v-if="show">hello</p>
  </transition>
</div>
```

```javascript
new Vue({
  el: '#example-3',
  data: {
    show: true
  }
})
```

--------------------------------

### Initialize Vue Router Instance

Source: https://v2.vuejs.org/v2/guide/migration-vue-router

Demonstrates the change in initializing a Vue application with Vue Router. Previously, 'router.start' was used, but now a router instance is passed as a property to the Vue instance.

```javascript
router.start({
  template: '<router-view></router-view>'
}, '#app')
```

```javascript
new Vue({
  el: '#app',
  router: router,
  template: '<router-view></router-view>'
})
```

```javascript
new Vue({
  el: '#app',
  router: router,
  render: h => h('router-view')
})
```

--------------------------------

### Vue.js App Initialization with Components

Source: https://v2.vuejs.org/v2/cookbook/creating-custom-scroll-directives

Initializes a Vue application, mounting it to the '#app' element and registering several components, including custom media layout and image components.

```javascript
new Vue({
  el: '#app',
  components: {
    MediaLayout,
    ImageOne,
    ImageTwo,
    ImageThree
  }
})
```

--------------------------------

### Axios GET Request with Basic Error Handling

Source: https://v2.vuejs.org/v2/cookbook/using-axios-to-consume-apis

Demonstrates a basic Axios GET request to fetch data and uses the .catch() method to log any errors encountered during the request. This is useful for simple error logging.

```javascript
axios  
  .get('https://api.coindesk.com/v1/bpi/currentprice.json')  
  .then(response => (this.info = response.data.bpi))  
  .catch(error => console.log(error))  
```

--------------------------------

### Full Page CSS for Scroll Example

Source: https://v2.vuejs.org/v2/cookbook/creating-custom-scroll-directives

This CSS encompasses all styles for the scroll directive example, including body, headings, centering, and the animated '.box' element. It ensures the visual presentation and transition effects work correctly.

```css
body {
  font-family: 'Abhaya Libre', Times, serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: #000;
  color: #fff;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  font-family: 'Fira Sans', Helvetica, Arial, sans-serif;
  font-weight: 800;
}

.centered {
  margin: 0 auto;
  display: table;
  font-size: 60px;
  margin-top: 100px;
}

.box {
  border: 1px solid rgba(255, 255, 255, 0.5);
  padding: 8px 20px;
  line-height: 1.3em;
  opacity: 0;
  color: white;
  width: 200px;
  margin: 0 auto;
  margin-top: 30px;
  transform: translateZ(0);
  perspective: 1000px;
  backface-visibility: hidden;
  background: rgba(255, 255, 255, 0.1);
  transition: 1.5s all cubic-bezier(0.39, 0.575, 0.565, 1);
}

#app {
  height: 2000px;
}
```

--------------------------------

### Vue.js CSS Animations Example

Source: https://v2.vuejs.org/v2/guide/transitions

Illustrates how to use CSS animations with Vue's `<transition>` component. This example shows the Vue instance, HTML structure, and CSS defining a 'bounce' animation for entering and leaving elements.

```html
<div id="example-2">
  <button @click="show = !show">Toggle show</button>
  <transition name="bounce">
    <p v-if="show">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris facilisis enim libero, at lacinia diam fermentum id. Pellentesque habitant morbi tristique senectus et netus.</p>
  </transition>
</div>
```

```javascript
new Vue({
  el: '#example-2',
  data: {
    show: true
  }
})
```

```css
.bounce-enter-active {
  animation: bounce-in .5s;
}
.bounce-leave-active {
  animation: bounce-in .5s reverse;
}
@keyframes bounce-in {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
  }
}
```

--------------------------------

### Vue.js Simple Routing From Scratch

Source: https://v2.vuejs.org/v2/guide/routing

Demonstrates how to implement basic client-side routing without a full-featured router library. It dynamically renders components based on the current URL path. This approach is suitable for simple SPAs where external dependencies are to be minimized.

```javascript
const NotFound = { template: '<p>Page not found</p>' }  
const Home = { template: '<p>home page</p>' }  
const About = { template: '<p>about page</p>' }  
  
const routes = {  
  '/': Home,  
  '/about': About  
}  
  
new Vue({  
  el: '#app',  
  data: {  
    currentRoute: window.location.pathname  
  },  
  computed: {  
    ViewComponent () {  
      return routes[this.currentRoute] || NotFound  
    }  
  },  
  render (h) { return h(this.ViewComponent) }  
})
```

--------------------------------

### Vue Anchored Heading Component Example

Source: https://v2.vuejs.org/v2/guide/render-function

A complete Vue.js component example demonstrating the use of createElement to render an anchored heading. It includes a helper function to extract text content for generating the heading ID and uses props for the heading level.

```javascript
var getChildrenTextContent = function (children) {
  return children.map(function (node) {
    return node.children
      ? getChildrenTextContent(node.children)
      : node.text
  }).join('')
}

Vue.component('anchored-heading', {
  render: function (createElement) {
    var headingId = getChildrenTextContent(this.$slots.default)
      .toLowerCase()
      .replace(/\W+/g, '-')
      .replace(/(^-|-$)/g, '')

    return createElement(
      'h' + this.level,
      [
        createElement('a', {
          attrs: {
            name: headingId,
            href: '#' + headingId
          }
        }, this.$slots.default)
      ]
    )
  },
  props: {
    level: {
      type: Number,
      required: true
    }
  }
})
```

--------------------------------

### Vue Single File Component Example

Source: https://v2.vuejs.org/v2/guide/single-file-components

A typical Single File Component (.vue) example in Vue.js, showcasing the integration of HTML template, JavaScript logic, and CSS styles within a single file. This approach is facilitated by build tools like Webpack with vue-loader.

```vue
<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <p>
      For a guide and recipes on how to configure / customize this project,
      check out the
      <a href="https://cli.vuejs.org" target="_blank">vue-cli documentation</a>.
    </p>
  </div>
</template>

<script>
export default {
  name: 'hello',
  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }
}
</script>

<style scoped>
.hello {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}

h1, h2 {
  font-weight: normal;
}

ul {
  list-style-type: none;
  padding: 0;
}

li {
  display: inline-block;
  margin: 0 10px;
}

a {
  color: #42b983;
}
</style>

```

--------------------------------

### Writing a Vue.js Plugin

Source: https://v2.vuejs.org/v2/guide/plugins

Explains the structure of a Vue.js plugin, which must expose an `install` method. This method receives the Vue constructor and optional options, allowing the plugin to add global methods, assets, mixins, or instance methods.

```APIDOC
## Writing a Vue.js Plugin

### Description
A Vue.js plugin should expose an `install` method. The method will be called with the `Vue` constructor as the first argument, along with possible options.

### Plugin Structure
```javascript
MyPlugin.install = function (Vue, options) {
  // 1. add global method or property
  Vue.myGlobalMethod = function () {
    // some logic ...
  }

  // 2. add a global asset
  Vue.directive('my-directive', {
    bind (el, binding, vnode, oldVnode) {
      // some logic ...
    }
    // ... other hook functions
  })

  // 3. inject some component options
  Vue.mixin({
    created: function () {
      // some logic ...
    }
    // ... other component options
  })

  // 4. add an instance method
  Vue.prototype.$myMethod = function (methodOptions) {
    // some logic ...
  }
}
```

### Types of Plugins
Plugins can typically:
1. Add global methods or properties.
2. Add global assets like directives or filters.
3. Inject component options via global mixins.
4. Add instance methods by attaching them to `Vue.prototype`.
5. Provide their own API while injecting one or more of the above.
```

--------------------------------

### Elastic Header Example Placeholder

Source: https://v2.vuejs.org/v2/examples/elastic-header

A placeholder block indicating the scope of the elastic header implementation.

```text
Those are out of scope for this quick little hack. However, the idea
```

--------------------------------

### Using v-on Shorthand in Vue.js

Source: https://v2.vuejs.org/v2/guide/syntax

Demonstrates the transition from the full v-on syntax to the shorthand '@' syntax. It also shows how to use dynamic event names with the shorthand notation.

```html
<!-- full syntax -->
<a v-on:click="doSomething"> ... </a>

<!-- shorthand -->
<a @click="doSomething"> ... </a>

<!-- shorthand with dynamic argument (2.6.0+) -->
<a @[event]="doSomething"> ... </a>
```

--------------------------------

### Email Validation Regex

Source: https://v2.vuejs.org/v2/examples/firebase

A regular expression for validating email formats. This is used within the example for input validation.

```javascript
var emailRE = /^(([^<>()[]\.,;:s@\"]+(\.[^<>()[]\.,;:s@\"]+)*)|(\".+\"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
```

--------------------------------

### Configure Transition Modes

Source: https://v2.vuejs.org/v2/guide/transitions

Explains how to use transition modes like out-in and in-out to control the sequence of entering and leaving animations.

```html
<transition name="fade" mode="out-in">
  <!-- ... the buttons ... -->
</transition>
```

--------------------------------

### Check Vue Version with Vue.version

Source: https://v2.vuejs.org/v2/api

Provides a pattern for checking the installed version of Vue to ensure compatibility with plugins or components.

```javascript
var version = Number(Vue.version.split('.')[0])

if (version === 2) {
  // Vue v2.x.x
} else if (version === 1) {
  // Vue v1.x.x
} else {
  // Unsupported versions of Vue
}
```

--------------------------------

### Directive Modifiers

Source: https://v2.vuejs.org/v2/guide/syntax

Modifiers are special postfixes denoted by a dot that provide special behavior to directives. For example, `.prevent` for `v-on`.

```APIDOC
## Directive Modifiers

### Description
Applies special behavior to directives using postfixes starting with a dot.

### Method
N/A (Template directive)

### Endpoint
N/A (Template directive)

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```html
<form v-on:submit.prevent="onSubmit"> ... </form>
```

### Response
#### Success Response (200)
N/A (DOM manipulation)

#### Response Example
N/A (DOM manipulation)
```

--------------------------------

### Create Production-Ready Multi-Stage Dockerfile

Source: https://v2.vuejs.org/v2/cookbook/dockerize-vuejs-app

Uses Docker multi-stage builds to separate the build environment from the production environment. The final image uses NGINX to serve the static files, optimizing for performance and image size.

```dockerfile
# build stage
FROM node:lts-alpine as build-stage
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build

# production stage
FROM nginx:stable-alpine as production-stage
COPY --from=build-stage /app/dist /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]
```

--------------------------------

### Vue.js Multiple Select Example

Source: https://v2.vuejs.org/v2/guide/forms

Shows how to use v-model with a multiple select element, binding the selected options to an array.

```html
<select v-model="selected" multiple>
  <option>A</option>
  <option>B</option>
  <option>C</option>
</select>
<br>
<span>Selected: {{ selected }}</span>
```

--------------------------------

### Transition Between Elements with Keys

Source: https://v2.vuejs.org/v2/guide/transitions

Shows how to transition between elements using v-if/v-else. It emphasizes the importance of using unique key attributes to distinguish elements with the same tag name.

```html
<transition>
  <table v-if="items.length > 0">
    <!-- ... -->
  </table>
  <p v-else>Sorry, no items found.</p>
</transition>
```

```html
<transition>
  <button v-if="isEditing" key="save">
    Save
  </button>
  <button v-else key="edit">
    Edit
  </button>
</transition>
```

```html
<transition>
  <button v-bind:key="isEditing">
    {{ isEditing ? 'Save' : 'Edit' }}
  </button>
</transition>
```

--------------------------------

### Register Global Filters with Vue.filter

Source: https://v2.vuejs.org/v2/api

Provides examples for registering a global filter function and retrieving an existing filter definition.

```javascript
Vue.filter('my-filter', function (value) {
  // return processed value
})

var myFilter = Vue.filter('my-filter')
```

--------------------------------

### Standardize Single-File Component Structure

Source: https://v2.vuejs.org/v2/style-guide

Consistent ordering of <script>, <template>, and <style> tags improves readability. It is recommended to place <style> tags last as they are optional in some configurations.

```html
<!-- ComponentA.vue -->
<script>/* ... */</script>
<template>...</template>
<style>/* ... */</style>
```

--------------------------------

### Transition Between Multiple Elements

Source: https://v2.vuejs.org/v2/guide/transitions

Illustrates transitioning between multiple states using dynamic keys and computed properties to manage the displayed content.

```html
<transition>
  <button v-if="docState === 'saved'" key="saved">
    Edit
  </button>
  <button v-if="docState === 'edited'" key="edited">
    Save
  </button>
  <button v-if="docState === 'editing'" key="editing">
    Cancel
  </button>
</transition>
```

```html
<transition>
  <button v-bind:key="docState">
    {{ buttonMessage }}
  </button>
</transition>
```

```javascript
computed: {
  buttonMessage: function () {
    switch (this.docState) {
      case 'saved': return 'Edit'
      case 'edited': return 'Save'
      case 'editing': return 'Cancel'
    }
  }
}
```

--------------------------------

### Build and Run Docker Containers

Source: https://v2.vuejs.org/v2/cookbook/dockerize-vuejs-app

Commands to build a Docker image from a Dockerfile and execute it as a container. These commands map ports and manage container lifecycles.

```bash
docker build -t vuejs-cookbook/dockerize-vuejs-app .
docker run -it -p 8080:8080 --rm --name dockerize-vuejs-app-1 vuejs-cookbook/dockerize-vuejs-app
```

--------------------------------

### Accessing and Passing Slots

Source: https://v2.vuejs.org/v2/guide/render-function

Provides examples for accessing static and scoped slots via $slots and $scopedSlots, and passing scoped slots to child components.

```javascript
render: function (createElement) {
  return createElement('div', [
    createElement('child', {
      scopedSlots: {
        default: function (props) {
          return createElement('span', props.text)
        }
      }
    })
  ])
}
```

--------------------------------

### Migrate ready hook to mounted

Source: https://v2.vuejs.org/v2/guide/migration

The ready hook is replaced by mounted. To ensure elements are in-document, wrap logic in $nextTick.

```javascript
mounted: function () {
  this.$nextTick(function () {
    // code that assumes this.$el is in-document
  })
}
```

--------------------------------

### Register and Retrieve Global Components with Vue.component

Source: https://v2.vuejs.org/v2/api

Demonstrates how to register global components using extended constructors or options objects, and how to retrieve them.

```javascript
// register an extended constructor
Vue.component('my-component', Vue.extend({ /* ... */ }))

// register an options object (automatically call Vue.extend)
Vue.component('my-component', { /* ... */ })

// retrieve a registered component (always return constructor)
var MyComponent = Vue.component('my-component')
```

--------------------------------

### Vue.js Filter Usage Example

Source: https://v2.vuejs.org/v2/guide/filters

Demonstrates how to use filters in Vue.js within mustache interpolations and v-bind expressions. Filters are applied using the pipe symbol.

```html
<!-- in mustaches -->
{{ message | capitalize }}

<!-- in v-bind -->
<div v-bind:id="rawId | formatId"></div>
```

--------------------------------

### Using Abbreviated Default Slot Syntax

Source: https://v2.vuejs.org/v2/guide/components-slots

Demonstrates how to use v-slot directly on a component when only the default slot is provided. This syntax is concise but cannot be mixed with named slots.

```html
<current-user v-slot="slotProps">
  {{ slotProps.user.firstName }}
</current-user>
```

--------------------------------

### Implement Advanced Merge Logic

Source: https://v2.vuejs.org/v2/guide/mixins

An example of a complex merge strategy that combines nested objects by leveraging existing strategies like the one used for computed properties.

```javascript
const merge = Vue.config.optionMergeStrategies.computed
Vue.config.optionMergeStrategies.vuex = function (toVal, fromVal) {
  if (!toVal) return fromVal
  if (!fromVal) return toVal
  return {
    getters: merge(toVal.getters, fromVal.getters),
    state: merge(toVal.state, fromVal.state),
    actions: merge(toVal.actions, fromVal.actions)
  }
}
```

--------------------------------

### Vue Instance Template vs Render Function

Source: https://v2.vuejs.org/v2/guide/installation

Demonstrates the difference between using the template compiler (Full build) and the render function (Runtime-only build). The render function is preferred for smaller bundle sizes.

```javascript
// this requires the compiler
new Vue({
  template: '<div>{{ hi }}</div>'
})

// this does not
new Vue({
  render (h) {
    return h('div', this.hi)
  }
})
```

--------------------------------

### Applying slot-scope to a Todo List Component

Source: https://v2.vuejs.org/v2/guide/components-slots

An example of using slot-scope with destructuring to render a list of todo items with conditional logic based on the todo object properties.

```html
<todo-list v-bind:todos="todos">  
  <template slot="todo" slot-scope="{ todo }">  
    <span v-if="todo.isComplete">✓</span>  
    {{ todo.text }}  
  </template>  
</todo-list>
```

--------------------------------

### Organizing Components into Separate Files

Source: https://v2.vuejs.org/v2/style-guide

Illustrates the recommended project structure where each Vue component is contained within its own dedicated file for better maintainability.

```text
components/
|- TodoList.vue
|- TodoItem.vue
```

--------------------------------

### Prevent Infinite Recursion in Components

Source: https://v2.vuejs.org/v2/guide/components-edge-cases

Provides an example of a component that causes a stack overflow error due to unconditional recursive invocation, highlighting the need for conditional rendering.

```javascript
name: 'stack-overflow',  
template: '<div><stack-overflow></stack-overflow></div>'
```

--------------------------------

### Vue Instance Lifecycle Hooks

Source: https://v2.vuejs.org/v2/guide/instance

Overview of how to implement lifecycle hooks like created, mounted, updated, and destroyed in a Vue instance.

```APIDOC
## Vue Instance Lifecycle Hooks

### Description
Lifecycle hooks allow you to inject custom logic at specific stages of a Vue instance's lifecycle, such as initialization, template compilation, DOM mounting, and data updates.

### Usage
Define hooks as functions within the Vue instance options. Note: Do not use arrow functions for these hooks as they will not bind to the Vue instance context.

### Available Hooks
- **created**: Called synchronously after the instance is created.
- **mounted**: Called after the instance has been mounted.
- **updated**: Called after data changes cause the virtual DOM to re-render.
- **destroyed**: Called after the Vue instance has been destroyed.

### Implementation Example
```javascript
new Vue({  
  data: {  
    a: 1  
  },  
  created: function () {  
    console.log('a is: ' + this.a)  
  }  
})
```

### Important Note
Avoid using arrow functions for lifecycle hooks or callbacks (e.g., `created: () => ...`) because they do not have their own `this` context, which will lead to errors when attempting to access instance properties.
```

--------------------------------

### Vue.js Slot with Component Content

Source: https://v2.vuejs.org/v2/guide/components-slots

Demonstrates passing another Vue.js component as content to a slot. In this example, a `<font-awesome-icon>` component is used as the content for the slot within `<navigation-link>`.

```Vue
<navigation-link url="/profile">
  <font-awesome-icon name="user"></font-awesome-icon>
  Your Profile
</navigation-link>
```

--------------------------------

### Implementing Dynamic Directive Arguments

Source: https://v2.vuejs.org/v2/guide/custom-directive

Shows how to create a flexible directive that accepts dynamic arguments to change its behavior, such as pinning an element to either the top or left side.

```html
<div id="dynamicexample">
  <h3>Scroll down inside this section ↓</h3>
  <p v-pin:[position]="200">I am pinned onto the page at 200px to the left.</p>
</div>
```

```javascript
Vue.directive('pin', {
  bind: function (el, binding, vnode) {
    el.style.position = 'fixed';
    var s = (binding.arg == 'left' ? 'left' : 'top');
    el.style[s] = binding.value + 'px';
  }
});

new Vue({
  el: '#dynamicexample',
  data: function () {
    return {
      position: 'left'
    }
  }
})
```

--------------------------------

### Apply Initial Render Transitions in Vue

Source: https://v2.vuejs.org/v2/guide/transitions

Demonstrates how to use the appear attribute on a transition component to trigger animations when a node is first rendered. This can be customized with specific CSS classes or JavaScript hooks.

```html
<transition appear>
  <!-- ... -->
</transition>
```

```html
<transition
  appear
  appear-class="custom-appear-class"
  appear-to-class="custom-appear-to-class"
  appear-active-class="custom-appear-active-class"
>
  <!-- ... -->
</transition>
```

```html
<transition
  appear
  v-on:before-appear="customBeforeAppearHook"
  v-on:appear="customAppearHook"
  v-on:after-appear="customAfterAppearHook"
  v-on:appear-cancelled="customAppearCancelledHook"
>
  <!-- ... -->
</transition>
```

--------------------------------

### Using a Component in a Template

Source: https://v2.vuejs.org/v2/guide

Demonstrates how to use a registered component ('todo-item') within an HTML template. This shows the basic instantiation of a component.

```html
<ol>
  <!-- Create an instance of the todo-item component -->
  <todo-item></todo-item>
</ol>

```