Using CSS transitions in CSS Grid Layout

Question

I am trying to get my sticky header to have a transition effect so it eases in rather than just a snap movement.

What am I doing wrong?

Here's my a working version:

http://codepen.io/juanmata/pen/RVMbmr

Basically the following code adds the class tiny to my wrapper class, this works fine.

$(window).on('load', function() {
    $(window).on("scroll touchmove", function () {
        $('.wrapper').toggleClass('tiny', $(document).scrollTop() > 0);
    });
});

Here's the CSS part:

.wrapper {
    grid-template-rows: 80px calc(75vh - 80px) 25vh 80px;
    -o-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -webkit-transition: all 0.5s;
    transition: all 0.5s;
}
.tiny {
    grid-template-rows: 40px calc(75vh - 40px) 25vh 80px;
}

So the header does shrink as it should but there is no animation, have I missed something or does transitions simply not work with grid?

Here's a link to the css-grid docs.

https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout

$(window).on('load', function() {
  $(window).on("scroll touchmove", function() {
    $('.wrapper').toggleClass('tiny', $(document).scrollTop() > 0);
  });
});

* {
	margin:0;
	padding:0;
}

.wrapper {
	display: grid;
	grid-gap: 0px;
	grid-template-columns: 1fr 1fr 1fr 1fr;
	grid-template-rows: 80px calc(75vh - 80px) 25vh 80px;
	grid-template-areas:
		"head head head head"
		"main main main main"
		"leader leader leader leader"
		"foot foot foot foot";
	background-color: #fff;
	color: #444;
}
.tiny {
	grid-template-rows: 40px calc(75vh - 40px) 25vh 80px;
}
.box {
	background-color: #444;
	color: #fff;
	border-radius: 5px;
	font-size: 150%;
}
.box .box {
	background-color: lightcoral;
}

.head {
	grid-area: head;
	background-color: #999;
	z-index: 2;
	display: grid;
	grid-gap: 0px;
	grid-template-columns: 20% 1fr;
	-o-transition: all 0.5s;
	-moz-transition: all 0.5s;
	-webkit-transition: all 0.5s;
	transition: all 0.5s;
	position: sticky;
	top: 0;
}

.logo{
        height: inherit;
        grid-column: 1;
        grid-row: 1;
        background-color:red;
        position: relative;
        overflow: hidden;
    }
.logo img {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        display: block;
        max-width: 100%;
        height: auto;
    }
.main {
	grid-area: main;
	/* CSS Grid */
	z-index: 1;
	grid-column: head-start / head-end;
	grid-row: head-start / leader-start;
	background-color: red;
}
.leader {
	grid-area: leader;
	z-index:1;
	display: grid;
	grid-gap: 0px;
	grid-template-columns: repeat(4, 1fr  );
}
.foot {
	grid-area: foot;
	z-index:1;
}

<div class="wrapper">
  <div class="box head">
    <div class="box logo">
      <a href="#"><img src="https://unsplash.it/200/300/?random" /></a>
    </div>
    <div class="box nav">nav</div>
  </div>
  <div class="box main">main</div>
  <div class="box leader">
    <div class="box leader-1">1</div>
    <div class="box leader-2">2</div>
    <div class="box leader-3">3</div>
    <div class="box leader-4">4</div>
  </div>
  <div class="box foot">foot</div>
</div>

Solution 1

According to the spec, transitions should work on grid-template-columns and grid-template-rows.

7.2. Explicit Track Sizing: the grid-template-rows and grid-template-columns properties

Animatable: as a simple list of length, percentage, or calc, provided the only differences are the values of the length, percentage, or calc components in the list

So, if my interpretation is correct, as long as the only changes are to the values of the properties, with no changes to the structure of the rule, transitions should work. But they don't.

---

UPDATE

This does work but is so far only implemented in Firefox. Follow here for other browser updates. https://codepen.io/matuzo/post/animating-css-grid-layout-properties

~ a contribution in the comments by @bcbrian

---

Here's a test I created:

grid-container {
  display: inline-grid;
  grid-template-columns: 100px 20vw 200px;
  grid-template-rows: repeat(2, 100px);
  background-color: black;
  height: 230px;
  transition: 2s;
  
  /* non-essential */
  grid-gap: 10px;
  padding: 10px;
  box-sizing: border-box;
}

grid-container:hover {
  grid-template-columns: 50px 10vw 100px;
  grid-template-rows: repeat(2, 50px);
  background-color: red;
  height: 130px;
  transition: 2s;
}

grid-item {
  background-color: lightgreen;
}

<grid-container>
  <grid-item></grid-item>
  <grid-item></grid-item>
  <grid-item></grid-item>
  <grid-item></grid-item>
  <grid-item></grid-item>
  <grid-item></grid-item>
</grid-container>

jsFiddle demo

In the test, the transition works on the height and background color, but not on grid-template-rows or grid-template-columns.

Solution 2

As a workaround, you can work with the size of the grid items instead with grid-template-columns or grid-template-rows.

You could do:

grid-container {
  display: inline-grid;
  grid-template-columns: 100px 20vw 200px;
  background-color: black;
  height: 230px;
  transition: 2s;
  
  /* non-essential */
  grid-gap: 10px;
  padding: 10px;
  box-sizing: border-box;
}

grid-container:hover {
  background-color: red;
  height: 130px;
}

grid-item {
  height: 100px;
  transition: height 2s;
  background-color: lightgreen;
}

grid-container:hover .first-row {
  height: 25px;
}

grid-container:hover .last-row {
  height: 75px;
}

<grid-container>
  <grid-item class='first-row'></grid-item>
  <grid-item class='first-row'></grid-item>
  <grid-item class='first-row'></grid-item>
  <grid-item class='last-row'></grid-item>
  <grid-item class='last-row'></grid-item>
  <grid-item class='last-row'></grid-item>
</grid-container>

Here's another 2x2 example: https://codepen.io/erik127/pen/OvodQR

and here a more extensive example where you can add more columns or rows: https://codepen.io/erik127/pen/rdZbxL

Unfortunately it's a lot of javascript, it would be nice if grid-template-columns and grid-template-rows would be animatable.

Another alternative which might work in some usecases (if your grid items don't span multiple rows) is the use of flexbox together with a grid.

Solution 3

Another approach is to use transform. It actually might even be better because transform along w/ opacity can achieve 60fps because it's GPU accelerated instead of CPU accelerated (browser has to do less work).

here's an example: https://codepen.io/oneezy/pen/YabaoR

.sides {
  display: grid;
  grid-template-columns: 50vw 50vw;
}

.monkey { animation: 0.7s monkey cubic-bezier(.86,0,.07,1) 0.4s both; }
.robot { animation: 0.7s robot cubic-bezier(.86,0,.07,1) 0.4s both; }

@keyframes monkey {
  0% { transform: translate(-50vw); }
  100% { transform: 0; }
}

@keyframes robot {
  0% { transform: translate(50vw); }
  100% { transform: 0; }
}