javascript - 具有条件渲染子级的动画组件
问题描述
我是动画的初学者。我有一个简单的 React 组件,它是一个面板,其内容根据状态而变化。我想要的是面板变大时的动画。
如果我使用 css transitions
,它不起作用。我必须做些什么来为面板设置动画(例如它的高度)?
我看着 react-spring 但我无法让它工作,我问是否可以使用 react-spring 来做我想做的事情。
const {useState} = React;
const Example = ({title}) => {
const [isOpen, setIsOpen] = useState(false);
return (
<>
<div
className=""
style={{
position: "relative",
width: "100%",
height: "100%",
backgroundColor: "tomato"
}}
></div>
<div
className="panel"
style={{
position: "absolute",
bottom: 20,
right: 20,
backgroundColor: "pink",
width: 200,
padding: 15
}}
>
<div>Title</div>
{!isOpen && (
<div onClick={() => setIsOpen(true)} style={{ cursor: "pointer" }}>
Open
</div>
)}
{isOpen && (
<div style={{ overflowY: "scroll", height: 250 }}>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim
ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum. Sed ut
perspiciatis unde omnis iste natus error sit voluptatem accusantium
doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo
inventore veritatis et quasi architecto beatae vitae dicta sunt
explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur
aut odit aut fugit, sed quia consequuntur magni dolores eos qui
ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui
dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed
quia non numquam eius modi tempora incidunt ut labore et dolore
magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis
nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut
aliquid ex ea commodi consequatur? Quis autem vel eum iure
reprehenderit qui in ea voluptate velit esse quam nihil molestiae
consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla
pariatur?
</div>
)}
{isOpen && <div onClick={() => setIsOpen(false)}>Close</div>}
</div>
</>
};
// Render it
ReactDOM.render(
<Example title="Example using Hooks:" />,
ddocument.getElementById("react"));
html,
body {
width: 100%;
height: 100%;
}
#root {
width: 100%;
height: 100%;
}
<div id="react"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
解决方案
您可以使用transition
和transform
为高度设置动画。div
但是,这种方法的一个缺点是您必须在要设置动画的对象上设置固定高度。我包含了一个小沙盒演示:https ://codesandbox.io/s/react-hooks-usestate-forked-l8h91?file=/src/index.js 。
const Example = ({title}) => {
let [isOpen, setIsOpen] = useState(false);
return (
<>
<div
className=""
style={{
position: "relative",
width: "100%",
height: "100%",
backgroundColor: "tomato"
}}
></div>
<div
className="panel"
style={{
position: "absolute",
bottom: 20,
right: 20,
backgroundColor: "pink",
width: 200,
padding: 15
}}
>
<div>Title</div>
{!isOpen && (
<div onClick={() => setIsOpen(true)} style={{ cursor: "pointer" }}>
Open
</div>
)}
<div className={`test-box ${!isOpen ? "hideItems" : "showItems"}`}>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt
mollit anim id est laborum. Sed ut perspiciatis unde omnis iste natus
error sit voluptatem accusantium doloremque laudantium, totam rem
aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto
beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia
voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni
dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam
est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit,
sed quia non numquam eius modi tempora incidunt ut labore et dolore
magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis
nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut
aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit
qui in ea voluptate velit esse quam nihil molestiae consequatur, vel
illum qui dolorem eum fugiat quo voluptas nulla pariatur?
</div>
{isOpen && <div onClick={() => setIsOpen(false)}>Close</div>}
</div>
</>
);
}
在这里,当您单击打开和关闭时,div
将动画进出。也许这可以帮助你开始。
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