是指在React中使用ref属性获取DOM元素的引用,并通过该引用获取DOM元素的高度(clientHeight)。在React中,可以使用ref属性来引用DOM元素,并通过ref.current来访问DOM元素的属性和方法。
以下是一个示例代码,演示如何从react-reason DOM引用获取clientHeight:
[@react.component]
let make = () => {
let myRef = React.useRef(Js.Nullable.null);
let handleClick = () => {
let element = Js.Nullable.toOption(myRef->React.Ref.current);
switch (element) {
| Some(el) => {
let clientHeight = el##clientHeight;
Js.log(clientHeight);
}
| None => Js.log("Ref is null")
};
};
<div>
<div ref={myRef}></div>
<button onClick={_ => handleClick()}>Get clientHeight</button>
</div>;
};
在上述代码中,我们使用了React的Hooks API中的useRef函数来创建一个ref对象myRef。然后,将该ref对象赋值给需要引用的DOM元素的ref属性。在点击按钮时,通过myRef.current获取DOM元素的引用,并使用clientHeight属性获取DOM元素的高度。
这种方法适用于需要在React组件中获取DOM元素的高度的场景,例如在动态计算布局或进行其他基于DOM元素尺寸的操作时。
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