我正在开展 React 和 mobx 的工作。
我创建了一个 ImageCarousel组件 ,其中显示了单击的图像。 我有一个上一个和一个下一个按钮(它们本身就是一个组件),可以在图像之间移动。
我尝试用lodash debounce
包装这些操作(上一页和下一页),
但是在途中失败了。
我现在的商店有这些行动:
prevCarousel
nextCarousel
debounceAction
debounceAction
只是一个高阶函数,可以获得2个参数(fn,等待),并使用这些参数调用lodash debounce
。
我的CarouselButton组件通过它支持我上面提到的那些动作。在我使用onClick
事件触发的组件内部,以实际操作(上一步或下一步)调用debounceAction(fn, wait)
。
我不确定如何用正确的方式去辩护。
我在第二个代码段(在 CarouselButton组件中)调用debounceAction
(包含去抖动的 HOF )。
galleryStore.jsx - 当前商店:
class GalleryStore {
// Observables
@observable images = [
// ....images
];
@observable carouselleButtons= {
next: "fa fa-chevron-right",
back: "fa fa-chevron-left"
}
@observable selectedImageIndex = null;
@observable hideCarousel = true;
@observable onTransition = false;
// Actions
selectImage = (index) =>{
this.selectedImageIndex = index;
}
toggleCarousel = () =>{
this.hideCarousel = !this.hideCarousel;
}
carouselNext = () => {
if(this.selectedImageIndex == this.images.length - 1) {
return;
}
this.onTransition = true;
setTimeout(() => {
this.selectedImageIndex = this.selectedImageIndex + 1;
this.onTransition = false;
},500)
}
carouselPrev = () => {
if(this.selectedImageIndex == 0) {
console.log('start of the collection');
return;
}
this.onTransition = true;
setTimeout(() => {
this.selectedImageIndex = this.selectedImageIndex - 1;
this.onTransition = false;
}, 500)
}
debounceAction = (fn, wait) => {
//lodash's debounce
return debounce(fn, wait);
}
carouselButton Component - 在这里我调用debounce :
// React's
import React from 'react';
// Styles
import CarouselButtonStyle from './carouselButtonStyle';
// CarouselButton Component
export default class CarouselButton extends React.Component {
debounce = (e) =>{
const { debounceAction } = this.props;
// -----> HERE I CALL DEBOUNCE ! <---------
e.stopPropagation();
debounceAction(this.buttonHandler, 400);
}
buttonHandler = (e) => {
const {limit, index, action, debounceAction} = this.props;
if(index == limit) return;
else action();
}
render(){
const {limit, index, icon, action, debounceAction} = this.props;
return(
<CarouselButtonStyle
onClick={(e) => {this.debounce(e)}}
className={ index == limit ? 'end-of-collection' : '' } >
<i className={icon} aria-hidden="true" />
</CarouselButtonStyle>
);
}
}
imageCarousel.jsx - carouselButton parent 组件:
// React's
import React from 'react';
// Mobx-react's
import { observer, inject } from 'mobx-react';
// Styles
import ImageCarouselStyle from './imageCarouselStyle';
// Components
import ImgContainer from './imgContainer/imgContainer';
import CarouselButton from './carouselButton/carouselButton';
// ImageCarousel Component
@inject('galleryStore')
@observer
export default class ImageCarousel extends React.Component {
closeCarousel = () => {
this.props.galleryStore.toggleCarousel();
}
onKeyDown = (e) => {
const { keyCode } = e;
if(keyCode ===27) this.onEscHandler();
else if (keyCode == 37) this.onLeftArrow();
else if (keyCode == 39) this.onRightArrow();
else return;
}
onLeftArrow = () => { this.props.galleryStore.carouselPrev() }
onRightArrow = () => { this.props.galleryStore.carouselNext() }
onEscHandler = () => { this.closeCarousel() }
componentDidMount(){
document.addEventListener('keydown', this.onKeyDown, false);
}
render(){
return(
<ImageCarouselStyle
hidden={this.props.galleryStore.hideCarousel}
onClick={this.closeCarousel} >
<CarouselButton action={'prev'}
icon={this.props.galleryStore.carouselleButtons.back}
action={this.props.galleryStore.carouselPrev}
limit={0}
index={this.props.galleryStore.selectedImageIndex}
debounceAction={this.props.galleryStore.debounceAction} />
<ImgContainer
images={this.props.galleryStore.images}
imgIndex={this.props.galleryStore.selectedImageIndex}
onTransition={this.props.galleryStore.onTransition}/>
<CarouselButton action={'next'}
icon={this.props.galleryStore.carouselleButtons.next}
action={this.props.galleryStore.carouselNext}
limit={this.props.galleryStore.amountOfImages}
index={this.props.galleryStore.selectedImageIndex}
debounceAction={this.props.galleryStore.debounceAction} />
</ImageCarouselStyle>
);
}
}
答案 0 :(得分:1)
问题是您必须从debounceAction
CarouselButton
方法返回debounce
。
debounce = (e) =>{
const { debounceAction } = this.props;
// -----> HERE I CALL DEBOUNCE ! <---------
e.stopPropagation();
debounceAction(this.buttonHandler, 400);
// -^^^ must return here
}
但是,我建议更进一步,以避免将来混淆。只需在需要时调用lodash的debounce
,而不是在代码中多次重写它并导致可疑的方法名称。
以下是如何打包单击处理程序的最基本示例:
class Button extends React.Component {
handleClick = _.debounce((e) => {
alert('debounced click reaction')
}, 1000)
render() {
return <button onClick={this.handleClick}>CLICK ME</button>
}
}
ReactDOM.render(
<Button />,
document.getElementById('app')
);
&#13;
<div id="app"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>
&#13;