Meet VueJs

Vue.jsVue.js
Reactive Components for Modern Web Interfaces

Vue.js highlightsVue.js highlights
Vue.js – Intro
View-layer library
Simple & beautiful API
Lightweight (~24kb min+gzip)
Fast
Reactive
Component based

How to start?How to start?
Vue.js – Basics

var object = {
message: 'Hello world!'
}
Vue.js – Basics

var object = {
}
Vue.js – Basics
<div id="example">
{{ message }}
</div>

var object = {
}
Vue.js – Basics
<div id="example">
{{ message }}
</div>
new Vue({
el: '#example',
data: object
})

var object = {
}
Vue.js – Basics
<div id="example">
{{ message }}
</div>
new Vue({
el: '#example',
data: object
})
This is now reactive!

Reactivity - how does it work?Reactivity - how does it work?
Vue.js – Basics
When passing an object to the Vue instance as it’s data
property, Vue.js walks through all it’s properties
and converts them to getter/setters
using .Object.deﬁneProperty
For every directive / data binding in the template, there will be a
corresponding watcher object. When a dependency’s setter is
called, it triggers the watcher to re-evaluate, and in turn causes its
associated directive to perform DOM updates.

Reactivity - how does it workReactivity - how does it work
Vue.js – Basics

Vue.js – Basics
You can use it „jQuery style”. Just add the library from the
CDN and you’re ready to go.
Simple to useSimple to use
No need for JSX, Webpack / Browserify, TypeScript or
silly React.createElement().
You can use it to enhance your old projects and keep
using all your favorite tools: Slim, Sass, CoﬀeeScript or
simply es5. Vue doesn’t care.

Vue.js – Basics
However if you decide to go for a full blown SPA, you get
all the tools you need.
Going full SPAGoing full SPA
Vue-cliVue-cli
Webpack / Browerify
Hot reloading
Linting
Unit/e2e tests
CSS extraction
Vue ecosystemVue ecosystem
Vue-router
Vuex
Vue-devtools
Vue-touch
Vue-validation
and more...

Vue.js – Basics
SingleSingle
FileFile
ComponentComponent

Vue.js – Basics
SingleSingle
FileFile
ComponentComponent
(with preprocessors!)

Vue.js – Basics
What’s with theWhat’s with the
scoped scoped attribute?attribute?
TheThe one linerone liner that prevents leaks of CSSthat prevents leaks of CSS
outside of components.outside of components.

Vue.js – Basics
VIRTUAL DOMVIRTUAL DOM
Hyperscript and JSX support
You can still use templates (those will
be converted to render functions)
Detects static class names and
attributes so they are never diﬀed after
initial render
Detects the maximum static sub trees
(with no dynamic bindings) and hoists
them out of the render function.

Vue.js – Basics
TWO AVAILABLETWO AVAILABLE
BUILDSBUILDS
THE COMPILER CAN NOW BETHE COMPILER CAN NOW BE
EXCLUDEDEXCLUDED
STANDALONE: Including the compiler and
the runtime.

RUNTIME ONLY: Not including the
compiler, which isn’t needed if you use a
webpack-loader or browserify transform
anyway (as you have a pre-compile step
then). Default build for NPM.

Vue.js – Basics
THINK REACT-NATIVETHINK REACT-NATIVE FORFOR
VUE.JSVUE.JS

Opens the possibility to render to
mobile native interfaces.

Is using a port of Vue.js 2.0
Maintained by Alibaba Group
Already available at:
http://alibaba.github.io/weex/index.html

Vue.js – Basics
Try it out!Try it out!
webpackbin.herokuapp.com/vue

Similarities with AngularJSSimilarities with AngularJS
Vue.js – Similarities with AngularJS

Directives in templateDirectives in template

<h1 v-if="ok">{{ name }}</h1>
<h1 v-else>No</h1>
<h1 ng-if="ok">{{ name }}</h1>
<h1 ng-if="!ok">No</h1>
<input type="text" v-model="name">
<input type="text" ng-model="name">
<small v-show="!ok">{{ Not OK! | capitalize }}</small>
<small ng-show="!ok">{{ Not OK! | capitalize }}</small>
<a v-bind:href="url">Go back</a>
<a ng-href="{{ url }}">Go back</a>
<button v-on:click="doSomething">Do something</button>
<button ng-click="doSomething">Do something</button>

Directives in template 2Directives in template 2

<div v-bind:class="{ 'class-a': isA, 'class-b': isB }"></div>
<div ng-class="{ 'class-a': isA, 'class-b': isB }"></div>
<ul id="example-1">
<li v-for="item in items">
{{ item.message }}
</li>
</ul>
<ul id="example-1">
<li ng-repeat="item in items">
{{ item.message }}
</li>
</ul>

Shorthands in VueShorthands in Vue

<button v-bind:disabled="someDynamicCondition">Button</button>

<button :disabled="someDynamicCondition">Button</button>
or

<a v-on:click="doSomething"></a>

<a @click="doSomething"></a>

Computed valuesComputed values
Vue.js – Features
<div id="example">
a={{ a }}, b={{ b }}
</div>
var vm = new Vue({
el: '#example',
data: {
a: 1
},
computed: {
// a computed getter
b: function () {
// `this` points to the vm instance
return this.a + 1
}
}
})

Computed setterComputed setter
Vue.js – Features
// ...
computed: {
fullName: {
// getter
get: function () {
return this.firstName + ' ' + this.lastName
},
// setter
set: function (newValue) {
var names = newValue.split(' ')
this.firstName = names[0]
this.lastName = names[names.length - 1]
}
}
}
// ..
// When calling vm.fullName = 'John Doe', the setter will
// be invoked and vm.firstName and vm.lastName
// will be updated accordingly.

Style bindingsStyle bindings
Vue.js – Features
<div v-bind:style="{ color: activeColor, fontSize: fontSize + 'px' }"></div>

AdditionallyAdditionally
When you use a CSS property that requires vendor preﬁxes in v-bind:style, for
example transform, Vue.js will automatically detect and add appropriate preﬁxes to
the applied styles.

Vue.js – Features
List renderingList rendering
var example1 = new Vue({
el: '#example-1',
data: {
items: [
{ message: 'Foo' },
{ message: 'Bar' }
],
object: {
FirstName: 'John',
LastName: 'Doe',
Age: 30
}
}
})
<ul id="example-1">
<li v-for="item in items">
{{ $index }} – {{ item.message }}
</li>
</ul
or
<ul>
<template v-for="item in items">
<li>{{ item.msg }}</li>
<li class="divider"></li>
</template>
</ul>

or
<div v-for="(key, val) in object">
{{ key }} {{ val }}
</div>

Methods & Events handlingMethods & Events handling
Vue.js – Features
var vm = new Vue({
el: '#example',
data: {
name: 'Vue.js'
},
// define methods under the `methods` object
methods: {
greet: function (user, event) {
// `this` inside methods point to the Vue instance
alert('Hello ' + user + ' this is ' + this.name + '!')
// `event` gives us access to original DOM event
}
}
})
// you can invoke methods in JavaScript too
vm.greet('Developers') // -> 'Hello Developers this is Vue.js!'
<button @click="greet('Developers', $event)">Greet</button>

Event modifiersEvent modifiers
Vue.js – Features

<a v-on:click.stop="doThis"></a>

<form v-on:submit.prevent="onSubmit"></form>

<a @click.stop.prevent="doThat">

<form v-on:submit.prevent></form>


<div @click.self="doThat">...</div>

<input @keyup.enter="submit">

ComponentsComponents
Vue.js – Components
<div id="example">
<my-component></my-component>
</div>
// define
var MyComponent = Vue.extend({
template: '<div>A component!</div>'
})
// register globally
Vue.component('my-component', MyComponent)
// create a root instance
new Vue({
el: '#example'
})

ComponentsComponents
<div id="example">
<my-component></my-component>
</div>
// define
var MyComponent = Vue.extend({
template: '<div>A component!</div>'
})
// register globally
Vue.component('my-component', MyComponent)
// create a root instance
new Vue({
el: '#example'
})

<div id="example">
<div>A component!</div>
</div>

Local registrationLocal registration
var Child = Vue.extend({ /* ... */ })
var Parent = Vue.extend({
template: '...',
components: {
// <my-component> will only be available in Parent'
'my-component': Child
}
})

PropsProps
Vue.component('child', {
// declare the props
props: ['myProp'],
// the prop can be used inside templates, and will also
// be set as `this.msg`
template: '<span>{{ myProp }}</span>'
})
<child my-prop="hello!"></child>

Remember: When using camelCased prop names as
attributes, you need to use their kebab-case equivalents.

Dynamic propsDynamic props
<div>
<child :my-value="obj"></child>
</div>
var Parent = Vue.extend({
template: '...',
components: {
Child
},
data: function () {
return {
obj: { name: 'Vue', ext: 'JS' }
}
}
})
This will pass the whole object as prop.

Prop validationProp validation
Vue.component('example', {
props: {
// basic type check (`null` means accept any type)
propA: Number,
// a required string
propB: {
type: String,
required: true
},
// a number with default value
propC: {
type: Number,
default: 100
},
// object/array defaults should be returned from a
// factory function
propD: {
type: Object,
default: function () {
return { msg: 'hello' }
}}}}

Prop validation 2Prop validation 2
Vue.component('example', {
props: {
// indicate this prop expects a two-way binding. will
// raise a warning if binding type does not match.
propE: {
twoWay: true
},
// custom validator function
propF: {
validator: function (value) {
return value > 10
}
},
// coerce function (new in 1.0.12)
// cast the value before setting it on the component
propG: {
coerce: function (val) {
return val + '' // cast the value to string
}
}
}

SlotsSlots

<div>
<h1>This is my component!</h1>
<slot>
This will only be displayed if there is no content
to be distributed.
</slot>
</div>

<my-component>
<p>This is some original content</p>
<p>This is some more original content</p>
</my-component>

<div>
<h1>This is my component!</h1>
<p>This is some original content</p>
<p>This is some more original content</p>
</div>
(like transclusion in angularJS)

Named slotsNamed slots

<div>
<slot name="one"></slot>
<slot></slot>
<slot name="two"></slot>
</div>

<multi-insertion>
<p slot="one">One</p>
<p slot="two">Two</p>
<p>Default A</p>
</multi-insertion>

<div>
<p slot="one">One</p>
<p>Default A</p>
<p slot="two">Two</p>
</div>

MixinsMixins
Vue.js – Mixins
// define a mixin object
var myMixin = {
created: function () {
this.hello()
},
methods: {
hello: function () {
console.log('hello from mixin!')
}
}
}
// define a component that uses this mixin
var Component = Vue.extend({
mixins: [myMixin]
})
var component = new Component() // -> "hello from mixin!"

Mixing mixins Mixing mixins
Vue.js – Mixins
var mixin = {
console.log('mixin hook called')
}
}
new Vue({
mixins: [mixin],
console.log('component hook called')
}
})
// -> "mixin hook called"
// -> "component hook called"

Vue.js – Mixins
var mixin = {
methods: {
foo: function () {
console.log('foo')
},
conflicting: function () {
console.log('from mixin')
}
}
}
var vm = new Vue({
mixins: [mixin],
methods: {
bar: function () {
console.log('bar')
},
console.log('from self')
}
}
})

Vue.js – Mixins
var mixin = {
methods: {
foo: function () {
console.log('foo')
},
console.log('from mixin')
}
}
}
var vm = new Vue({
mixins: [mixin],
methods: {
bar: function () {
console.log('bar')
},
console.log('from self')
}
}
})
vm.foo() // -> "foo"
vm.bar() // -> "bar"
vm.conflicting() // -> "from self"

Vue-RouterVue-Router
Vue.js – Plugins
import Vue from 'vue'
import Router from 'vue-router'
import App from './app.vue'
import ViewA from './view-a.vue'
import ViewB from './view-b.vue'
Vue.use(Router)
const router = new Router()
router.map({
'/a': { component: ViewA },
'/b': { component: ViewB }
})
router.start(App, '#app')
<div>
<h1>This is the layout that won't change</h1>
<router-view></rout
</div>

VuexVuex
Vue.js – Plugins
Flux for Vue.js

VuexVuex
Vue.js – Plugins
import Vuex from 'vuex'
const state = {
counter: 0
}
const mutations = {
INCREMENT (state) {
state.counter++
}
}
export default new Vuex.Store({
state,
mutations
})
store.dispatch('INCREMENT')
console.log(store.state.count) // -> 1

Vue.js – Plugins Example flowExample flow

Vue.js – Plugins Vue-devtoolsVue-devtools

Vue.js vs Angular 1.xVue.js vs Angular 1.x
Vue.js – Comparition
Simpler API and design.

Less opinionated, easier to
combine with other libraries.

One-way data binding. Supports
explicit two-way bindings.

Better performance and easier
to optimize.
Complex API, hard to master.

Very opinionated, requires
doing things angular-way.

Two-way bindings. Explicit
one-way bindings (1.3+).

Dirty-checking. Nuﬀ said.
Differences:Differences:

Vue.js vs Angular 1.xVue.js vs Angular 1.x
Components and directives

Template bindings (ng-if, ng-repeat vs v-if, v-for)

Concepts naming i.e. scope, watcher, directive, ﬁlters
Similarities:Similarities:

Vue.js vs ReactVue.js vs React
DOM with references to real
nodes.

Clean separation of HTML & JS.
Easier to visually think about
designs.

Prefers mutating state
Virtual DOM, rerender and
patch DOM on every update.

Puts HTML inside JS. Easy to
leak lots of logic inside render
function.

Prefers immutable state

Works on real DOM

Easy support for popular
preprocessors for HTML, JS, CSS

Friendly for newcomers and
easier to get productive fast

Actually more fun!
Tricky to perform DOM
manipulations

More Everything-in-JS
approach

Due to functional nature,
steeper learning curve

More platform-agnostic

Reactive and based on components

Just the View layer. Support for diﬀerent state
management solutions e.g. Flux/Redux. Vue also
introduces Vuex and bindings for Redux (like revue)

Performant!
Similarities:Similarities:

2016 was a good year2016 was a good yearVue.js
Github : 3rd most starred among all projects in 2016

Vue.js
“ Yes, this is a personal project. So if you are looking for an
enterprise backed dev team, Vue is probably not the one. But
I’d rather look at the numbers. Vue has maintained
on every single commit since the 0.11 rewrite,
and that will continue. GitHub issues are closed within
, and there has been 1400+ of them. As
of this writing, there are literally zero open and reproducible
bugs.
100%
test coverage
an
average of 13 hours
— Evan You, Vue.js author
http://blog.evanyou.me/2015/12/20/vuejs2015inreview/

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