Vue

Animating

Sarah Drasner

@sarah_edo

Consultant

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

      Microsoft

Sr. Cloud
Developer Advocate

Why Animate?

“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

Timing

consider how things look to your user

Gain understanding

Spatial or otherwise

Without Transitions

Paul Bakaus

Morphing

More in my CSS-Tricks Article

this pen.

How?

  • <transition />
  • watchers/reactivity
  • custom directives
  • page transitions
  • *bonus* vue data vis

Vue Basics

V-Model

Creates a relationship between the data in the instance/component and a form input, so you can dynamically update values

Directives

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" rows="5" maxlength="75"/>
  <p>{{ message }}</p>
</div>

This pen.

<Transition />

  <app-modal v-if="isShowing">
    ...
  </app-modal>

This pen.

😳

<transition name="fade">
  <app-modal v-if="isShowing">
    ...
  </app-modal>
</transition>

  <app-modal v-if="isShowing">
    ...
  </app-modal>

Transition Component

Encapsulate what is changing declaratively

Vue Elegance

Default 'v-' prefix, otherwise name="foo"

Example:

.v-enter-active {
  transition: opacity 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

This pen.

Great!

But...

<div :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>
.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

CSS Animation

enter-active-class="toasty"
leave-active-class="bounceOut"

Still <transition /> component, but

This pen.

  <transition
    enter-active-class="bouncein"
    leave-active-class="rollout">
    <div v-if="isShowing">
      <app-child class="child"></app-child>
    </div>
  </transition>

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.

<transition @before-enter="beforeEnter" @enter="enter" :css="false">
  <p class="booktext" v-if="load">
    {{ message }}
  </p>
</transition>
new Vue({
  ...
  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));
       ...
    }
  }
});

<TransitionGroup />

FLIP, with no heavy lifting!

FLIP stands for First, Last, Invert, Play

Rosario's article

 <transition-group name="cell" tag="div" class="container">
    <div v-for="cell in cells" :key="cell.id">
      {{ cell.number }}
    </div>
  </transition-group>

From the guide

Snipcart's post

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")

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

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>
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)
    }
  }
 watch: {
    checked() { 
      let period = this.timeVal.slice(-2),
          hr = this.timeVal.slice(0, this.timeVal.indexOf(":"));
      
      const dayhr = 12,
            rpos  = 115,
            rneg  = -118;
      
      if ((period === 'AM' && hr != 12) || (period === 'PM' && hr == 12)) {
        this.spin(`${rneg - (rneg/dayhr) * hr}`)
        this.animTime(1-hr/dayhr, period)
      } else {
        this.spin(`${(rpos/dayhr) * hr}`)
        this.animTime(hr/dayhr, period)
      }
      
    }
  },
methods: {
    //this formats the hour info without a library
    getCurrentHour(zone) {
      let newhr = new Date().toLocaleTimeString('en', {
        hour: '2-digit', 
        minute: '2-digit', 
        hour12: true, 
        timeZone: zone
      })
      return newhr
    },
  ...
}

Side note: get rid of big libraries

React to events, change an animation mid-stream

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}%` }">

SVG Animation

Vue.js

=

🔥

+

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

Coordinating Transitions

End to end

Encapsulate what is changing - repo

State-driven animation

Encapsulate what is changing:

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;
    }
  }
});

Vuex

<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';
    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>

😃

Pass arguments

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

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 and Serverless

Serverless

Functions as a Service

FaaS

is an actually interesting thing with the most clickbaity title

Serverless in Azure

getGeo(makeIterator(content), (updatedContent, err) => {
  if (!err) {
    // we need to base64 encode the JSON to embed it into the PUT (dear god, why)
    let updatedContentB64 = new Buffer(
      JSON.stringify(updatedContent, null, 2)
    ).toString('base64');
    let pushData = {
      path: GH_FILE,
      message: 'Looked up locations, beep boop.',
      content: updatedContentB64,
      sha: data.sha
    };
    ...
};

We're going to retrieve the geo-information for each item in the original data

function getGeo(itr, cb) {
 let curr = itr.next();
 if (curr.done) {
   // All done processing- pass the (now-populated) entries to the next callback
   cb(curr.data);
   return;
 }

 let location = curr.value.Location;

Single element

Three.js

<div id="container"></div>

Call on mounted

mounted() {
  //we have to load the texture when it's mounted and pass it in
  let earthmap = THREE.ImageUtils.loadTexture('/world7.jpg');
  this.initGlobe(earthmap);
}
//from
const geometry = new THREE.SphereGeometry(200, 40, 30);
//to 
const geometry = new THREE.IcosahedronGeometry(200, 0);

Vue

makes 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!

These slides:

slides.com/sdrasner/animating-vue-e17

Animating Vue Fall 2017

By sdrasner

Animating Vue Fall 2017

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