Vue

Animating

Sarah Drasner

@sarah_edo

Consultant

CSS-Tricks, IBM, Microsoft,
Smashing Magazine, NetMag, Zillow, Workflo,
O’Reilly, Frontend Masters, & Mule Design

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

State change can create the animation

If it's similar enough, we can transition with watchers

SVG is good for this because it's built with MATH

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

<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">

SVG has <text>

this pen

<text v-model="type" 
      x="50%" y="250" 
      fill="url(#p-fire)" 
      font-family="Erica One" 
      font-size="140" 
      stroke="white" 
      text-anchor="middle">
        {{ type }}
</text>

In template:

In instance:

new Vue({
  el: '#app',
  data() {
    return {
      type: 'Edit me I am SVG'
    }
  }
})

<Transition />

Transition Component

Encapsulate what is changing declaratively

Vue Elegance

Vue's <transition> component

Sugar! Like in-out modes

🏆

🏆

Without in-out 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

.flip-enter-active {
  transition: all .2s cubic-bezier(0.55, 0.085, 0.68, 0.53); 
}

CSS

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"
.toasty {
  toasty 1s ease both;
}

Still <transition /> component, but

(Simplest example)

Can also hook into CSS animation libraries this way

<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
    name="ballmove"
    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

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');
    }
  },
  enter () {
    //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");
  }
}

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

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-17

Animating Vue

By sdrasner

Animating Vue

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