I am trying to create an animation for moving a child element from one parent element to another using React.
A user should be able to click on an element and see it move into another div.
I made a simple demo ponent (without the animation) to show what I mean. When an element is clicked, the state updates and the elements are re-rendered in the correct place.
class App extends React.Component {
state = {
list: ['Alice', 'Bob', 'Charlie', 'David', 'Emily', 'Frank'],
top: [0, 1, 2],
bottom: [3, 4, 5]
}
moveDown = (item) => {
let { top, bottom } = this.state
this.setState({
top: top.filter(x => x !== item),
bottom: [...bottom, item]
})
}
moveUp = (item) => {
let { top, bottom } = this.state
this.setState({
top: [...top, item],
bottom: bottom.filter(x => x !== item)
})
}
render() {
let { top, bottom, list } = this.state
return (
<div style={{
display: 'flex',
flexDirection: 'column',
justifyContent: 'space-between',
alignItems: 'center',
height: '90vh',
width: '100%'
}}>
<div>
{top.map((item) =>
<div
onClick={() => this.moveDown(item)}
style={{color:'red'}}>{list[item]}</div>
)}
</div>
<div>
{bottom.map((item) =>
<div
onClick={() => this.moveUp(item)}
style={{color:'green'}}>{list[item]}</div>
)}
</div>
</div>
)
}
}
Codepen demo:
Big appreciation to and thanks in advance for any help or advice on how to achieve this div-to-div animation.
I am trying to create an animation for moving a child element from one parent element to another using React.
A user should be able to click on an element and see it move into another div.
I made a simple demo ponent (without the animation) to show what I mean. When an element is clicked, the state updates and the elements are re-rendered in the correct place.
class App extends React.Component {
state = {
list: ['Alice', 'Bob', 'Charlie', 'David', 'Emily', 'Frank'],
top: [0, 1, 2],
bottom: [3, 4, 5]
}
moveDown = (item) => {
let { top, bottom } = this.state
this.setState({
top: top.filter(x => x !== item),
bottom: [...bottom, item]
})
}
moveUp = (item) => {
let { top, bottom } = this.state
this.setState({
top: [...top, item],
bottom: bottom.filter(x => x !== item)
})
}
render() {
let { top, bottom, list } = this.state
return (
<div style={{
display: 'flex',
flexDirection: 'column',
justifyContent: 'space-between',
alignItems: 'center',
height: '90vh',
width: '100%'
}}>
<div>
{top.map((item) =>
<div
onClick={() => this.moveDown(item)}
style={{color:'red'}}>{list[item]}</div>
)}
</div>
<div>
{bottom.map((item) =>
<div
onClick={() => this.moveUp(item)}
style={{color:'green'}}>{list[item]}</div>
)}
</div>
</div>
)
}
}
Codepen demo: https://codepen.io/ee92/pen/LqrBjL?editors=0010
Big appreciation to and thanks in advance for any help or advice on how to achieve this div-to-div animation.
Share Improve this question asked Feb 12, 2019 at 23:25 Egor EgorovEgor Egorov 7654 gold badges10 silver badges22 bronze badges1 Answer
Reset to default 14No it's not possible
It's not possible to animate in that way because the DOM thinks you're removing a div and then adding a new div. Even though it's the same div to you, the DOM doesn't have that context. Animations are controlled by changes to CSS, not HTML.
...but here's how to do it
If you actually need both lists to stay in different divs the best you can do is either:
- Animate the
old itemto thenew itemposition, then delete theold itemand show thenew item. - Remove the
old itemand create anew itemwhere theold itemwas and move it to thenew itemposition.
Same concept, two ways of doing it.
I modified your existing sample to show a simplified version of option 2. Note that there are a number of animation decisions to make like what happens when the list gets smaller, how should the items change from red to green, etc., and I didn't try and objectively solve them. Also, this would be much easier if you could have all the items for both lists in one div, and control their positions absolutely. But if they need to end up in separate divs...
https://codepen.io/sallf/pen/VgBwQr?editors=0010
What's going on
- Adding a
transitionto.itemwe can make the animation happen when we make adjustments to thetransformproperty. - On item click we update our lists in state and add...
transition.itemto know which item is animating...transition.startTopto know the offsetyposition the item should start at relative to the bottom of the list it's moving to, and...transition.startAnimas a flag to control the animation.- Since
transitions need something to change before they'll animate, we usesetTimeoutto delay the change oftransition.startAnimwhich basically causes the animation from the puted position, back to0.