How can I make this transition smooth instead of it jumping up

I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM

And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/

When you click on new notification button, already displayed notifications jump up to make room for the new notification and new notification slides in. I was wondering how I could make it so that they all smoothly go up together.

The notifications wont all be the same dimensions so I cant set static values for height/etc.

Thank you!

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%)

  }

  20% {

    transform: translateY( 0)

  }

  80% {

    transform: translateY( 0)

  }

  100% {

    transform: translateY( 100%)

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

asked Nov 14 '18 at 21:05

Syn

645

add a comment |

I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM

And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/

The notifications wont all be the same dimensions so I cant set static values for height/etc.

Thank you!

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%)

  }

  20% {

    transform: translateY( 0)

  }

  80% {

    transform: translateY( 0)

  }

  100% {

    transform: translateY( 100%)

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

asked Nov 14 '18 at 21:05

Syn

645

add a comment |

I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM

And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/

The notifications wont all be the same dimensions so I cant set static values for height/etc.

Thank you!

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%)

  }

  20% {

    transform: translateY( 0)

  }

  80% {

    transform: translateY( 0)

  }

  100% {

    transform: translateY( 100%)

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

asked Nov 14 '18 at 21:05

Syn

645

I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM

And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/

The notifications wont all be the same dimensions so I cant set static values for height/etc.

Thank you!

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%)

  }

  20% {

    transform: translateY( 0)

  }

  80% {

    transform: translateY( 0)

  }

  100% {

    transform: translateY( 100%)

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%)

  }

  20% {

    transform: translateY( 0)

  }

  80% {

    transform: translateY( 0)

  }

  100% {

    transform: translateY( 100%)

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%)

  }

  20% {

    transform: translateY( 0)

  }

  80% {

    transform: translateY( 0)

  }

  100% {

    transform: translateY( 100%)

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

javascript css animation css-animations

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

asked Nov 14 '18 at 21:05

Syn

645

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

asked Nov 14 '18 at 21:05

Syn

645

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.5k74774

asked Nov 14 '18 at 21:05

Syn

645

asked Nov 14 '18 at 21:05

Syn

645

asked Nov 14 '18 at 21:05

Syn

645

add a comment |

2 Answers
2

active

oldest

votes

Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.

The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.

Example:

let btn = document.querySelector('button'),

  container = document.querySelector('.notifications-container'),

  notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",

  "<code>another.test()</code>",

  "<strong>another</strong> <i>test</i>"

]



btn.onclick = () => {

  let notif = document.createElement('div'),

    index = Math.floor(Math.random() * notif_contents.length)

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[index]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })



  container.append(notif)

  notif.style.marginTop = '-' + notif.offsetHeight + 'px'

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid #888;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid #ddd;

  border-bottom: none;

  animation: notifAnim 5s forwards;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0%,

  100% {

    transform: translateY( 100%)

  }

  20%,

  80% {

    transform: translateY( 0);

    margin-top: 0

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

add a comment |

An idea is to insert new element with a height equal to 0 and you animate the height in addition to translate. Of course, you should use max-height since height are unknown and we cannot animate to auto:

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding:0 10px;

  max-height:0px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%);

    max-height:0;

    padding:0 10px;

  }

  30% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  80% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  100% {

    transform: translateY( 100%);

    max-height:300px;

    padding:10px;

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

– Andrei Gheorghiu
Nov 14 '18 at 22:11

@AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

– Temani Afif
Nov 14 '18 at 22:17

If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

– Andrei Gheorghiu
Nov 14 '18 at 22:20

@AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

– Temani Afif
Nov 14 '18 at 22:29

add a comment |

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2 Answers
2

active

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votes

2 Answers
2

active

oldest

votes

Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.

The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.

Example:

let btn = document.querySelector('button'),

  container = document.querySelector('.notifications-container'),

  notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",

  "<code>another.test()</code>",

  "<strong>another</strong> <i>test</i>"

]



btn.onclick = () => {

  let notif = document.createElement('div'),

    index = Math.floor(Math.random() * notif_contents.length)

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[index]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })



  container.append(notif)

  notif.style.marginTop = '-' + notif.offsetHeight + 'px'

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid #888;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid #ddd;

  border-bottom: none;

  animation: notifAnim 5s forwards;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0%,

  100% {

    transform: translateY( 100%)

  }

  20%,

  80% {

    transform: translateY( 0);

    margin-top: 0

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

add a comment |

Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.

The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.

Example:

let btn = document.querySelector('button'),

  container = document.querySelector('.notifications-container'),

  notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",

  "<code>another.test()</code>",

  "<strong>another</strong> <i>test</i>"

]



btn.onclick = () => {

  let notif = document.createElement('div'),

    index = Math.floor(Math.random() * notif_contents.length)

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[index]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })



  container.append(notif)

  notif.style.marginTop = '-' + notif.offsetHeight + 'px'

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid #888;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid #ddd;

  border-bottom: none;

  animation: notifAnim 5s forwards;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0%,

  100% {

    transform: translateY( 100%)

  }

  20%,

  80% {

    transform: translateY( 0);

    margin-top: 0

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

add a comment |

Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.

The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.

Example:

let btn = document.querySelector('button'),

  container = document.querySelector('.notifications-container'),

  notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",

  "<code>another.test()</code>",

  "<strong>another</strong> <i>test</i>"

]



btn.onclick = () => {

  let notif = document.createElement('div'),

    index = Math.floor(Math.random() * notif_contents.length)

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[index]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })



  container.append(notif)

  notif.style.marginTop = '-' + notif.offsetHeight + 'px'

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid #888;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid #ddd;

  border-bottom: none;

  animation: notifAnim 5s forwards;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0%,

  100% {

    transform: translateY( 100%)

  }

  20%,

  80% {

    transform: translateY( 0);

    margin-top: 0

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.

The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.

Example:

let btn = document.querySelector('button'),

  container = document.querySelector('.notifications-container'),

  notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",

  "<code>another.test()</code>",

  "<strong>another</strong> <i>test</i>"

]



btn.onclick = () => {

  let notif = document.createElement('div'),

    index = Math.floor(Math.random() * notif_contents.length)

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[index]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })



  container.append(notif)

  notif.style.marginTop = '-' + notif.offsetHeight + 'px'

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid #888;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid #ddd;

  border-bottom: none;

  animation: notifAnim 5s forwards;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0%,

  100% {

    transform: translateY( 100%)

  }

  20%,

  80% {

    transform: translateY( 0);

    margin-top: 0

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

let btn = document.querySelector('button'),

  container = document.querySelector('.notifications-container'),

  notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",

  "<code>another.test()</code>",

  "<strong>another</strong> <i>test</i>"

]



btn.onclick = () => {

  let notif = document.createElement('div'),

    index = Math.floor(Math.random() * notif_contents.length)

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[index]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })



  container.append(notif)

  notif.style.marginTop = '-' + notif.offsetHeight + 'px'

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid #888;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid #ddd;

  border-bottom: none;

  animation: notifAnim 5s forwards;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0%,

  100% {

    transform: translateY( 100%)

  }

  20%,

  80% {

    transform: translateY( 0);

    margin-top: 0

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

let btn = document.querySelector('button'),

  container = document.querySelector('.notifications-container'),

  notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",

  "<code>another.test()</code>",

  "<strong>another</strong> <i>test</i>"

]



btn.onclick = () => {

  let notif = document.createElement('div'),

    index = Math.floor(Math.random() * notif_contents.length)

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[index]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })



  container.append(notif)

  notif.style.marginTop = '-' + notif.offsetHeight + 'px'

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid #888;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding: 10px;

  border: 1px solid #ddd;

  border-bottom: none;

  animation: notifAnim 5s forwards;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0%,

  100% {

    transform: translateY( 100%)

  }

  20%,

  80% {

    transform: translateY( 0);

    margin-top: 0

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.5k74774

add a comment |

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding:0 10px;

  max-height:0px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%);

    max-height:0;

    padding:0 10px;

  }

  30% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  80% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  100% {

    transform: translateY( 100%);

    max-height:300px;

    padding:10px;

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

– Andrei Gheorghiu
Nov 14 '18 at 22:11

@AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

– Temani Afif
Nov 14 '18 at 22:17

If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

– Andrei Gheorghiu
Nov 14 '18 at 22:20

@AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

– Temani Afif
Nov 14 '18 at 22:29

add a comment |

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding:0 10px;

  max-height:0px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%);

    max-height:0;

    padding:0 10px;

  }

  30% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  80% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  100% {

    transform: translateY( 100%);

    max-height:300px;

    padding:10px;

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

– Andrei Gheorghiu
Nov 14 '18 at 22:11

@AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

– Temani Afif
Nov 14 '18 at 22:17

If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

– Andrei Gheorghiu
Nov 14 '18 at 22:20

@AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

– Temani Afif
Nov 14 '18 at 22:29

add a comment |

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding:0 10px;

  max-height:0px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%);

    max-height:0;

    padding:0 10px;

  }

  30% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  80% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  100% {

    transform: translateY( 100%);

    max-height:300px;

    padding:10px;

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding:0 10px;

  max-height:0px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%);

    max-height:0;

    padding:0 10px;

  }

  30% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  80% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  100% {

    transform: translateY( 100%);

    max-height:300px;

    padding:10px;

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding:0 10px;

  max-height:0px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%);

    max-height:0;

    padding:0 10px;

  }

  30% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  80% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  100% {

    transform: translateY( 100%);

    max-height:300px;

    padding:10px;

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

let btn = document.querySelector('button')

let container = document.querySelector('.notifications-container')



let notif_contents = [

  "<p>1</p><p>1</p><p>1</p><p>1</p>",

  "<p>test</p>",

  "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"

]

let current = 0



btn.onclick = () => {



  let notif = document.createElement('div')

  notif.classList.add('notif')

  notif.innerHTML = notif_contents[current]

  notif.addEventListener('animationend', () => {

    notif.parentElement.removeChild(notif)

  })

  current++



  container.append(notif)

}

* {

  box-sizing: border-box;

}



.container {

  height: 300px;

  width: 400px;

  border: 1px solid black;

  position: absolute;

}



.notifications-container {

  position: absolute;

  top: 0;

  right: 0;

  height: 100%;

  width: 200px;

  background: rgba( 0, 0, 0, 0.2);

  display: flex;

  flex-flow: column nowrap;

  justify-content: flex-end;

  overflow: hidden;

}



.notif {

  position: relative;

  width: 100%;

  padding:0 10px;

  max-height:0px;

  border: 1px solid black;

  animation: notifAnim 5s forwards;

  transition: all .2s;

  background: white;

}



button {

  z-index: 100;

  background: lightcoral;

  color: white;

  border: none;

  padding: 10px;

  font-size: 20px;

  margin: 5px;

}



@keyframes notifAnim {

  0% {

    transform: translateY( 100%);

    max-height:0;

    padding:0 10px;

  }

  30% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  80% {

    transform: translateY( 0);

    max-height:300px;

    padding:10px;

  }

  100% {

    transform: translateY( 100%);

    max-height:300px;

    padding:10px;

  }

}

<div class="container">

  <button>New Notification</button>

  <div class="notifications-container"></div>

</div>

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

answered Nov 14 '18 at 21:41

Temani Afif

74.3k94386

While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

– Andrei Gheorghiu
Nov 14 '18 at 22:11

@AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

– Temani Afif
Nov 14 '18 at 22:17

If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

– Andrei Gheorghiu
Nov 14 '18 at 22:20

@AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

– Temani Afif
Nov 14 '18 at 22:29

add a comment |

While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

– Andrei Gheorghiu
Nov 14 '18 at 22:11

@AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

– Temani Afif
Nov 14 '18 at 22:17

If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

– Andrei Gheorghiu
Nov 14 '18 at 22:20

@AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

– Temani Afif
Nov 14 '18 at 22:29

While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

– Andrei Gheorghiu
Nov 14 '18 at 22:11

@AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

– Temani Afif
Nov 14 '18 at 22:17

If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

– Andrei Gheorghiu
Nov 14 '18 at 22:20

@AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

– Temani Afif
Nov 14 '18 at 22:29

add a comment |

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