[英]React owl carousel is blank
我正在使用React owl輪播來顯示動態輪播。
當我放置static html it displays the data properly in carousel
但是當我嘗試顯示dynamic data
(使用axios)時, carousel is always blank
。
注意 :::我使用axios提取數據並更新用於循環數據的狀態。
有人可以解釋一下我在這里犯了什么錯誤,因為輪播總是空白。
所有代碼都在同一文件中:
我的代碼::
import React, { Component } from 'react';
import HeaderComponent from '../Common/Header';
import SidebarComponent from '../Common/Sidebar';
import TrendingStoriesComponent from './TrendingStories';
import FlashDealsComponent from './FlashDeals';
import WeeklyPicksComponent from './WeeklyPicks';
import OwlCarousel from 'react-owl-carousel';
import 'owl.carousel/dist/assets/owl.carousel.css';
import 'owl.carousel/dist/assets/owl.theme.default.css';
import axios from 'axios';
import moment from 'moment';
class HomeComponent extends Component {
constructor(props) {
super(props);
this.state = {
latest_stories: [],
}
}
componentDidMount() {
axios.get(process.env.REACT_APP_API_ENDPOINT+'/story/latest_stories')
.then((response) => {
// handle success
console.log(response);
this.setState({
latest_stories: response.data.response,
});
})
.catch(error => {
//Error object contains the response property
console.log(error);
});
}
render() {
return (
<>
<HeaderComponent />
<SidebarComponent />
<section className="weeklypick mt-4">
<div className="weeklyslider">
<OwlCarousel
className="owl-theme"
loop
margin={10}
nav
>
{
this.state.latest_stories.map((story,index) => {
console.log(story);//this prints successfully everytime in loop
return <div className="item" key={'latest-story-'+index}>
<div className="sliderbox">
<h6>
<span>25 Jan</span>
<img src="assets/images/dropdown.svg" alt="" />
</h6>
<div className="sliderboxfield">
<span className="yellowbadge">Adventures</span>
<img src="assets/images/car1.svg" alt="" />
</div>
<div className="textboxfield">
<p>I Visited Lush’s Biggest Ever Shop & The Treatments Will Truly Blow Your
Mind</p>
<ul>
<li>
<a href="#">BY SARAH STEVENS</a>
</li>
<li>
<a href="#">
<img src="assets/images/heart.svg" alt="" />
<span className="likecount">3.2k</span>
</a>
</li>
</ul>
</div>
</div>
</div>
})
}
</OwlCarousel>
</div>
</section>
</>
);
}
}
export default HomeComponent;
似乎OwlCarousel不會在狀態更改時重新渲染,因此即使狀態更新並且回調向其發送了新的子集,OwlCarousel仍像初始渲染一樣保持不變。 它確實具有回調掛鈎,您可以將更新綁定到其中,以便可以使用該更新進行更新,但是它看起來像是非常糟糕的文檔,因此我沒有花時間在上面。 有一個叫做onRefresh
的東西可以使用,它帶有一個函數,但是沒有一個例子可以告訴你如何做。 https://owlcarousel2.github.io/OwlCarousel2/docs/api-events.html
為了克服這個問題,我將OwlCarousel包裹在長度檢查中,該檢查只會在API調用返回后狀態一旦要渲染時才渲染。
{this.state.latest_stories.length && (
<OwlCarousel className="owl-theme" loop margin={10} nav>
{this.state.latest_stories.map((story, index) => {
console.log(story); //this prints successfully everytime in loop
return (
<>
<div className="item">
<h4>{story}</h4>
</div>
</>
);
})}
</OwlCarousel>
)}
這是基於您的代碼的工作示例: https : //codesandbox.io/s/recursing-hooks-gz5gl
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