Vue
Animating
Keynote
Sarah Drasner
Consultant
CSS-Tricks,
IBM,
Microsoft, Salesforce
Smashing Magazine,
NetMag,
Zillow, Workflo,
O’Reilly, Frontend Masters, & Mule Design
Microsoft
Sr. Cloud
Developer Advocate
Why Animate?
Our story starts with performance.
The "so what" factor
User attention span is short.
2 seconds
until dropoff
Amazon has discovered that for every one second delay, conversions dropped by 7%. If you sell $100k per day, that’s an annual loss of $2.5m.
Walmart has found that it gains 1% revenue increase for every 100ms of improvement.
Over 4 seconds: HORROR
Perceived Performance
Humans over-estimate passive waits by 36% - Eli Fitch and Richard Larson, MIT
Your benchmarks aren't telling you the full story.
Custom Experience:
Viget did an experiment and found that despite some individual variation, novel loaders as a whole had a higher wait time and lower abandon rate than generic ones
22 sec
14 sec
Creating Spatial Awareness
Saccade
“We’ve evolved to perform actions that flow more or less seamlessly.
"We aren’t wired to deal with the fits and starts of human-computer interaction.”
Sensory memory: Your occipital lobe (AKA “the memory store”) works in 100ms bursts.
-Tammy Everts
Gain understanding
Spatial or otherwise
Without Transitions
Paul Bakaus
Morphing
From this CSS-Tricks Article
this pen.
Interruption
Start with the end
If you know the end, you can figure out what comes in between
So Many Ways!
- How to work with Vue
- <transition /> component
- Watchers/Reactivity
- SVG!
- Event driven animation with user input
- Coordinating state with Vuex/ lifecycle methods
- Animations via custom directives
- Nuxt, server-side rendering, and page transitions
Vue Basics
Tiny Comparison
- A Virtual DOM
- Reactive components that offer the View layer only
- Props and a Redux-like store similar to React.
- Conditional rendering, and services, similar to Angular.
- Inspired by Polymer for simplicity and performance, Vue offers a similar development style as HTML, styles, and JavaScript are composed in tandem.
see the comparison
Hello World!
Obligatory Example
<div id="app">{{ text }} Nice to meet Vue.</div>
Light Comparison:
Vanilla JS vs Vue for Conditional Rendering
Vanilla JS
const items = [
'thingie',
'another thingie',
'lots of stuff',
'yadda yadda'
];
function listOfStuff() {
let full_list = '';
for (let i = 0; i < items.length; i++) {
full_list = full_list + `<li> ${items[i]} </li>`
}
const contain = document.querySelector('#container');
contain.innerHTML = `<ul> ${full_list} </ul>`;
}
listOfStuff();
HTML:
<div id="container"></div>
yields:
This pen
Vue
new Vue({
el: '#app',
data: {
items: [
'thingie',
'another thingie',
'lots of stuff',
'yadda yadda'
]
}
});
<div id="app">
<ul>
<li v-for="item in items">
{{ item }}
</li>
</ul>
</div>
yields:
This pen
- clean
- semantic
- declarative
- legible
- easy to maintain
- reactive
V-Model
Creates a relationship between the data in the instance/component and a form input, so you can dynamically update values
Accepting user input and managing it in a responsible manner
new Vue({
el: '#app',
data() {
return {
message: 'This is a good place to type things.'
}
}
});
<div id="app">
<h3>Type here:</h3>
<textarea v-model="message" class="message" rows="5" maxlength="72"/>
<br>
<p class="booktext">{{ message }} </p>
</div>
🏆
<Transition />
<div>
<h2>Here I am!</h2>
<slot></slot>
</div>
<div id="app">
<h3>Let's trigger this here modal!</h3>
<button @click="toggleShow">
<span v-if="isShowing">Hide child</span>
<span v-else>Show child</span>
</button>
<app-child v-if="isShowing" class="modal">
<button @click="toggleShow">
Close
</button>
</app-child>
</div>
const Child = {
template: '#childarea'
};
new Vue({
el: '#app',
data() {
return {
isShowing: false
}
},
methods: {
toggleShow() {
this.isShowing = !this.isShowing;
}
},
components: {
appChild: Child
}
});
This pen.
😳
<transition name="fade">
<app-child v-if="isShowing" class="modal">
<button @click="toggleShow">
Close
</button>
</app-child>
</transition>
<app-child v-if="isShowing" class="modal">
<button @click="toggleShow">
Close
</button>
</app-child>
Transition Component
Encapsulate what is changing declaratively
Vue Elegance
Default 'v-' prefix, otherwise name="foo"
Example:
.v-enter-active {
transition: color 1s ease;
}
.fade-enter-active, .fade-leave-active {
transition: opacity 0.25s ease-out;
}
.fade-enter, .fade-leave-to {
opacity: 0;
}
Reusable for other components
In this case, ease-out, but ease-out, ease-in for more complex effects
This is unnecessary, as it's default:
.fade-enter-to, .fade-leave {
opacity: 1;
}
This pen.
Great!
But...
<div v-bind:class="[isShowing ? blurClass : '', bkClass]">
<h3>Let's trigger this here modal!</h3>
<button @click="toggleShow">
<span v-if="isShowing">Hide child</span>
<span v-else>Show child</span>
</button>
</div>
new Vue({
el: '#app',
data() {
return {
isShowing: false,
bkClass: 'bk',
blurClass: 'blur'
}
},
...
});
.bk {
transition: all 0.05s ease-out;
}
.blur {
filter: blur(2px);
opacity: 0.4;
}
This pen.
Transition Modes
🏆
🏆
This pen
Without transition modes
The current element waits until the new element is done transitioning in to fire
The current element transitions out and then the new element transitions in.
In-out
Out-in
<transition name="flip" mode="out-in">
<slot v-if="!isShowing"></slot>
<img v-else src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/28963/cartoonvideo14.jpeg" />
</transition>
HTML
Not all are created equal
- Opacity
- Transforms
- Hardware Acceleration
@mixin accelerate($name) {
will-change: $name;
transform: translateZ(0);
backface-visibility: hidden;
perspective: 1000px;
}
.foo {
@include accelerate(transform);
}
CSS Animation
enter-active-class="toasty"
leave-active-class="bounceOut"
Still <transition /> component, but
<div id="app">
<h3>Bounce the Ball!</h3>
<button @click="toggleShow">
<span v-if="isShowing">Get it gone!</span>
<span v-else>Here we go!</span>
</button>
<transition
enter-active-class="bouncein"
leave-active-class="rollout">
<div v-if="isShowing">
<app-child class="child"></app-child>
</div>
</transition>
</div>
Bounce a ball
@mixin ballb($yaxis: 0) {
transform: translate3d(0, $yaxis, 0);
}
@keyframes bouncein {
1% { @include ballb(-400px); }
20%, 40%, 60%, 80%, 95%, 99%, 100% { @include ballb() }
30% { @include ballb(-80px); }
50% { @include ballb(-40px); }
70% { @include ballb(-30px); }
90% { @include ballb(-15px); }
97% { @include ballb(-10px); }
}
.bouncein {
animation: bouncein 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}
.ballmove-enter {
@include ballb(-400px);
}
Keep it DRY
JavaScript Hooks
<transition
@before-enter="beforeEnter"
@enter="enter"
@after-enter="afterEnter"
@enter-cancelled="enterCancelled"
@before-leave="beforeLeave"
@leave="leave"
@after-leave="afterLeave"
@leave-cancelled="leaveCancelled"
:css="false">
</transition>
Custom Naming
<transition
@enter="enterEl"
@leave="leaveEl"
:css="false">
<!-- put element here-->
</transition>
Most Basic Example
methods: {
enterEl(el, done) {
//entrance animation
done();
},
leaveEl(el, done) {
//exit animation
done();
},
}
Most Basic Example
This pen.
<textarea class="message" rows="5" v-model.lazy="message" maxlength="72" />
<br>
<button type="submit" class="submit" @click="load = !load">
<span v-if="!load">
Write Me
</span>
<span v-if="load">
Erase
</span>
</button>
<transition @before-enter="beforeEnter" @enter="enter" :css="false">
<p class="booktext" v-if="load">
{{ message }}
</p>
</transition>
new Vue({
el: '#app',
data() {
return {
message: 'This is a good place to type things.',
load: false
}
},
methods: {
beforeEnter(el) {
TweenMax.set(el, {
transformPerspective: 600,
perspective: 300,
transformStyle: "preserve-3d",
autoAlpha: 1
});
},
enter(el, done) {
...
tl.add("drop");
for (var i = 0; i < wordCount; i++) {
tl.from(split.words[i], 1.5, {
z: Math.floor(Math.random() * (1 + 150 - -150) + -150),
ease: Bounce.easeOut
}, "drop+=0." + (i/ 0.5));
...
}
}
});
let tl = new TimelineMax({ onComplete: done });
onComplete: done
done();
or
Leverage the Reactivity System for Transitions
Watchers
& Vue's Reactivity System
What is Reactive?
Reactive programming is programming with asynchronous data streams.
A stream is a sequence of ongoing events ordered in time that offer some hooks with which to observe it.
When we use reactive premises for building applications, this means it's very easy to update state in reaction to events.
What is Reactive?
- Angular 1.x has dirty checking.
- Cycle.js and Angular 2 use reactive streams like XStream and Rx.js.
- Vue.js, MobX or Ractive.js all use a variation of getters/setters.
More Resources:
Despite the name, React is not Reactive- it uses a "pull" approach (rather than "push")
Vue takes the object, walks through its properties and converts them to getter/setters
new Vue({
data: {
text: 'msg'
}
})
In Vue
The properties touched by the watcher during the render are registered as dependencies
When the setter is triggered, it lets the watcher know, and causes the component to re-render.
Each component has a watcher instance.
Watchers
Good for asynchronous updates,
and updates/transitions with data changes
We're going to 'watch' any data property declared on the Vue instance
State change can create the animation
SVG is good for this because it's built with MATH
<select v-model="selected">
<option v-for="option in options" v-bind:value="option.value">
{{ option.text }}
</option>
</select>
new Vue({
el: '#app',
data() {
return {
selected: [25, 37, 15, 13, 25, 30, 11, 17, 35, 10, 25, 15, 5, 27, 15, 13, 25, 36, 15, 14, 35, 10, 14, 15, 35, 17, 12, 13, 25, 30, 14, 17, 35, 10, 25, 15],
options: [
{ text: 'First Dataset', value: [25, 37, 15, 13, 25, 30, 11, 17, 35, 10, 25, 15, 5, 27, 15, 13, 25, 36, 15, 14, 35, 10, 14, 15, 35, 17, 12, 13, 25, 30, 14, 17, 35, 10, 25, 15] },
]
}
},
});
watch: {
selected: function(newValue, oldValue) {
var tweenedData = {}
var update = function() {
let obj = Object.values(tweenedData);
obj.pop();
this.targetVal = obj;
}
var tweenSourceData = { onUpdate: update, onUpdateScope: this}
for (let i = 0; i < oldValue.length; i++) {
let key = i.toString()
tweenedData[key] = oldValue[i]
tweenSourceData[key] = newValue[i]
}
TweenMax.to(tweenedData, 1, tweenSourceData)
}
}
SVG!
Built with math
<!--xaxis -->
<g targetVal="targetVal" class="xaxis">
<line x1="0" y1="1" x2="350" y2="1"/>
<g v-for="(select, index) in targetVal">
<line y1="0" y2="7" v-bind="{ 'x1':index*10, 'x2':index*10 }"/>
<text v-if="index % 5 === 0" v-bind="{ 'x':index*10, 'y':20 }">{{ index }}</text>
</g>
</g>
SVG!
- Crisp on any display
- Less HTTP requests to handle
- Easily scalable for responsive
- Small filesize if you design for performance
- Easy to animate
- Easy to make accessible
Flexible
Loaders
great case for SVG
Entire filesize: 6KB!
What does the "scalable" mean?
You never have to worry about positioning in CSS
We can do stuff like this, all fully responsive in every direction
this pen.
SVG Animation
Vue.js
=
🔥
+
Personality
Emotions are tied to your limbic system and easier to remember
This pen.
<div id="app" @mousemove="coordinates">
coordinates(e) {
const audio = new Audio('https://s3-us-west-2.amazonaws.com/s.cdpn.io/28963/Whoa.mp3'),
walleBox = document.getElementById('walle').getBoundingClientRect(),
walleCoords = walleBox.width / 2 + walleBox.left;
...
TweenMax.set("#eyes", {
scaleX: 1 + (1 - e.clientX / walleCoords) / 5
});
TweenMax.set("#walle", {
x: ((e.clientX / walleCoords) * 50) - 40
});
this.startArms.progress(1 - (e.clientX / walleCoords)).pause();
}
},
In <template>
In Vue Instance
clipPath- great support
Interpolation with style bindings- this pen
In the instance:
new Vue({
el: '#app',
data() {
return {
x: 0,
y: 0
}
},
methods: {
coords(e) {
this.x = e.clientX / 10;
this.y = e.clientY / 10;
},
}
})
In the template:
<div id="contain" :style="{ perspectiveOrigin: `${x}% ${y}%` }">
<div class="square square2">
<svg xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 419.9 421.9"
preserveAspectRatio="none">
This pen.
createBigCircles() {
const svgNS = this.$refs.figure.namespaceURI;
this.$refs.patterngroup.innerHTML = '';
for (let i = 0; i < this.numLines/2; i++) {
let circ = document.createElementNS(svgNS, 'circle');
this.append(this.$refs.patterngroup, circ);
this.setAttributes(circ, {
'cx': this.size/2,
'cy': this.size/2,
'r': this.totesRando(this.size/2, 0),
'fill': 'none',
'stroke': this.gradients2[this.totesRando(1, 0)],
'stroke-width': 1
});
}
},
<div class="formarea">
<h3>Create Circles:</h3>
<button @click="createSmCircles">Make small circles</button>
<button @click="createBigCircles">Make big circles</button>
</div>
animation() {
let tl = new TimelineMax()
tl.add('begin')
tl.to('line', 2, {
rotation: 360,
repeat: -1,
transformOrigin: '50% 50%',
ease: Sine.easeOut
}, 'begin')
...
return tl;
},
pauseAnim() {
var tl = TimelineLite.exportRoot();
tl.pause(0);
},
<div class="formarea">
<h3>Animation:</h3>
<button @click="animation">Play Animation</button>
<button @click="pauseAnim">Stop Animation</button>
</div>
This pen.
data() {
return {
total: 200,
radius: 15,
}
},
methods: {
incrementHeight() {
this.total += 100
},
incrementRadius() {
this.radius += 1
},
bounceBall() {
this.vy += this.g; // gravity increases the vertical speed
this.x1 += this.vx; // horizontal speed inccrements horizontal position
this.y1 += this.vy; // vertical speed increases vertical position
if (this.y1 > this.total - this.radius) { // if ball hits the ground
this.y1 = this.total - this.radius; // reposition it at the ground
this.vy *= -0.8; // then reverse and reduce its speed
}
},
...
animateBall() {
//use rAF to animate but put a boundary on it so it doesn't run forever
let start,
vueThis = this;
this.running = true;
function step(timestamp) {
if (!start) start = timestamp;
var progress = timestamp - start;
if (progress < 13000) {
vueThis.bounceBall();
vueThis.req = window.requestAnimationFrame(step);
} else {
vueThis.x1 = this.radius;
vueThis.y1 = this.radius;
vueThis.running = false;
}
}
this.req = window.requestAnimationFrame(step);
},
<button @click="animateBall" v-if="!running">Start</button>
Coordinating Transitions
End to end
Encapsulate what is changing - repo
State-driven animation
Encapsulate what is changing- Vuex
export const store = new Vuex.Store({
state: {
showWeather: false,
template: 0
},
mutations: {
toggle: state => state.showWeather = !state.showWeather,
updateTemplate: (state) => {
state.showWeather = !state.showWeather;
state.template = (state.template + 1) % 4;
}
}
});
<transition @leave="leaveDialog" :css="false">
<app-dialog v-if="showWeather"></app-dialog>
</transition>
<transition @leave="leaveDroparea" :css="false">
<g v-if="showWeather">
<app-droparea v-if="template == 1"></app-droparea>
<app-windarea v-else-if="template == 2"></app-windarea>
<app-rainbowarea v-else-if="template == 3"></app-rainbowarea>
<app-tornadoarea v-else></app-tornadoarea>
</g>
</transition>
export default {
computed: {
template() {
return this.$store.state.template;
}
},
methods: {
toggle() {
this.$store.commit('toggle');
}
},
mounted() {
//enter weather
const tl = new TimelineMax();
tl.add("enter");
tl.fromTo("#dialog", 2, {
opacity: 0
}, {
opacity: 1
}, "enter");
tl.fromTo("#dialog", 2, {
rotation: -4
}, {
rotation: 0,
transformOrigin: "50% 100%",
ease: Elastic.easeOut
}, "enter");
}
}
Lifecycle hooks
This pen.
const Child = {
beforeCreate() {
console.log("beforeCreate!");
},
...
};
Custom Directives
Vue.directive('tack', {
bind(el, binding, vnode) {
el.style.position = 'fixed'
}
});
<p v-tack>I will now be tacked onto the page</p>
😳
Vue.directive('tack', {
bind(el, binding, vnode) {
el.style.position = 'fixed'
el.style.top = binding.value + 'px'
}
});
<div id="app">
<p>Scroll down the page</p>
<p v-tack="70">Stick me 70px from the top of the page</p>
</div>
🙂
Vue.directive('tack', {
bind(el, binding, vnode) {
el.style.position = 'fixed';
const s = (binding.arg == 'left' ? 'left' : 'top');
el.style[s] = binding.value + 'px';
}
});
<p v-tack:left="70">I'll now be offset from the left instead of the top</p>
😊
Pass an argument
Vue.directive('tack', {
bind(el, binding, vnode) {
el.style.position = 'fixed';
el.style.top = binding.value.top + 'px';
el.style.left = binding.value.left + 'px';
}
});
<p v-tack="{ top: '40', left: '100' }">Stick me 40px from the top of the
page and 100px from the left of the page</p>
😃
More than one value
Let's apply this to Animation
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) {
TweenMax.to(el, 1.5, {
y: -10,
opacity: 1,
ease: Sine.easeOut
})
}
return window.scrollY > 100;
}
}
});
<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>
🔥
Custom Directives + D3
export default {
methods: {
totalImpact: function(evt, el) {
if (window.scrollY > 1100) {
TweenMax.to(el, 0.75, {
opacity: 0
})
let circ = d3.selectAll("circle")
.attr("cx", function(d) {
let lat = d["Longitude (Deg)"];
if (lat.includes("E")) {
return midX - parseInt(lat) * incByW;
} else {
return midX + (parseInt(lat) * incByW);
}
})
...
.attr("r", 5)
.attr("fill", "url(#radgrad)")
}
return window.scrollY > 1300;
},
Update the circle's coordinates
<div class="box accelerate impact" v-dscroll="totalImpact">
<h3>Total Impact</h3>
<p>Most alksdjflkjasd laksdjfl;kasjdf laksd falksdjf lsdj f</p>
</div>
Nuxt Routing & Page Transitions
Server Side Rendering
By rendering on the server, you can cache the final shape of your data
"
"
-Karl Seguin
Nuxt: Other Features
- Automatic Code Splitting
- Powerful Routing System
- Great lighthouse scores out of the gate 🐎
- Static File Serving
- ES6/ES7 Transpilation
- Hot reloading in Development
- Pre-processors: SASS, LESS, Stylus, etc
- Write Vue Files to create your pages and layouts!
- My personal favorite: easily add transitions to your pages
npm install -g vue-cli
--------
vue init nuxt/starter my-project
cd my-project
yarn
npm run dev
Templates in the pages directory
<nuxt-link to="/product">Product</nuxt link>
Transition hook already available
name="page"
.page-enter-active, .page-leave-active {
transition: all .25s ease-out;
}
.page-enter, .page-leave-active {
opacity: 0;
transform: scale(0.95);
transform-origin: 50% 50%;
}
🏆
Animation as well
.page-enter-active {
animation: acrossIn .45s ease-out both;
}
.page-leave-active {
animation: acrossOut .65s ease-in both;
}
JS Hooks
export default {
transition: {
mode: 'out-in',
css: false,
enter (el, done) {
let tl = new TimelineMax({ onComplete: done }),
spt = new SplitText('h1', {type: 'chars' }),
chars = spt.chars;
TweenMax.set(chars, {
transformPerspective: 600,
perspective: 300,
transformStyle: 'preserve-3d'
})
tl.add('start')
tl.from(el, 0.8, {
scale: 0.9,
transformOrigin: '50% 50%',
ease: Sine.easeOut
}, 'start')
...
tl.timeScale(1.5)
}
...
Vue & Nuxt
make it extraordinarily simple
to create complex and beautiful interactions
that feel seamless for our users.
We can connect states and reduce cognitive load for things that are changing in our application with ease.
Avoid burnout.
Have fun.
Thank you!
@sarah_edo on twitter
These slides:
slides.com/sdrasner/animating-vue-keynote
Animating Vue - Keynote
By sdrasner
Animating Vue - Keynote
- 12,790