Introduction to Vue.js

Vue (pronouced like view) is a progressive framework for building UI. Perfectly capable of powering Single-Page Applications when used with modern tooling and supporting libraries

Declarative Rendering

<div id="app">
  
</div>
<div id="app-2">
  <span v-bind:title="message">
    Hover your mouse over me for a few seconds
    to see my dynamically bound title!
  </span>
</div>

var app = new Vue({
  el: '#app', // element to id="app"
  data: {
    message: 'Hello Vue!'
  }
})

var app2 = new Vue({
  el: '#app-2',
  data: {
    message: 'You loaded this page on ' + new Date()
  }
})

Conditionals and Loops

<div id="app-3">
  <p v-if="seen">Now you see me</p>
</div>
<div id="app-4">
  <ol>
    <li v-for="todo in todos">
      
    </li>
  </ol>
</div>

var app3 = new Vue({
  el: '#app-3',
  data: {
    seen: true
  }
})
var app4 = new Vue({
  el: '#app-4',
  data: {
    todos: [
      { text: 'Learn JavaScript' },
      { text: 'Learn Vue' },
      { text: 'Build something awesome' }
    ]
  }
})

Handling User Input

<div id="app-5">
  <p></p>
  <button v-on:click="reverseMessage">Reverse Message</button>
</div>
<div id="app-6">
  <p></p>
  <input v-model="message">
</div>

var app5 = new Vue({
  el: '#app-5',
  data: {
    message: 'Hello Vue.js!'
  },
  methods: {
    reverseMessage: function () {
      this.message = this.message.split('').reverse().join('')
    }
  }
})
var app6 = new Vue({
  el: '#app-6',
  data: {
    message: 'Hello Vue!'
  }
})

Composing with Components

vue-components

// Define a new component called todo-item
Vue.component('todo-item', {
  template: '<li>This is a todo</li>'
})
// added props
Vue.component('todo-item', {
  // The todo-item component now accepts a
  // "prop", which is like a custom attribute.
  // This prop is called todo.
  props: ['todo'],
  template: '<li></li>'
})

Vue.component('todo-item', {
  props: ['todo'],
  template: '<li></li>'
})
var app7 = new Vue({
  el: '#app-7',
  data: {
    groceryList: [
      { id: 0, text: 'Vegetables' },
      { id: 1, text: 'Cheese' },
      { id: 2, text: 'Whatever else humans are supposed to eat' }
    ]
  }
})

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

<div id="app-7">
  <ol>
    <!--
      Now we provide each todo-item with the todo object
      it's representing, so that its content can be dynamic.
      We also need to provide each component with a "key",
      which will be explained later.
    -->
    <todo-item
      v-for="item in groceryList"
      v-bind:todo="item"
      v-bind:key="item.id">
    </todo-item>
  </ol>
</div>

In a larger application, it is necessary to divide the whole app into components to make development manageable.

<div id="app">
  <app-nav></app-nav>
  <app-view>
    <app-sidebar></app-sidebar>
    <app-content></app-content>
  </app-view>
</div>

Written on July 14, 2017