te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - How to add Scroll to top in react - Stack Overflow

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    javascript - How to add Scroll to top in react - Stack Overflow

    programmeradmin4浏览0评论

    I am adding the Scroll to top div in Footer section. After clicking on the scroll top icon it will go the top of page

    After Clicking on the Scroll to top it will go the top of page

    Here is my code

    import React from 'react';

class ScrollTop extends React.Component {
    render() {
        return (
            <div className="scrolltop">
                <i className="fa fa-angle-up" />
            </div>
        );
    }
}

export default ScrollTop;

    I am adding the Scroll to top div in Footer section. After clicking on the scroll top icon it will go the top of page

    After Clicking on the Scroll to top it will go the top of page

    Here is my code

    import React from 'react';

class ScrollTop extends React.Component {
    render() {
        return (
            <div className="scrolltop">
                <i className="fa fa-angle-up" />
            </div>
        );
    }
}

export default ScrollTop;
    • javascript
    • reactjs
    Share Improve this question edited Aug 20, 2019 at 13:15 Vencovsky 31.7k22 gold badges130 silver badges195 bronze badges asked Aug 20, 2019 at 12:54 Leela Hari Prasad. RLeela Hari Prasad. R 591 gold badge1 silver badge7 bronze badges 1
    • 1 React is just JavaScript. Not everything has to be done the "React way". – isherwood Commented Aug 20, 2019 at 12:55
    Add a ment  | 

    4 Answers 4

    Reset to default 10

    Just use vanilla javascript

    import React from 'react';

class ScrollTop extends React.Component {
    render() {
        return (
            <div className="scrolltop" onClick={() => window.scrollTo({top: 0, behavior: 'smooth'})}>
                <i className="fa fa-angle-up" />
            </div>
        );
    }
}

export default ScrollTop;

    may be use this function 

    handleScroll=()=>{
    window.scrollX(0);
    // or 
    window.scroll({top:0,behavior:'smooth'})

}

    1. Before this code, you must install react-router.

    2. npm i react-router-dom

    import { useEffect } from 'react';
import { useLocation } from 'react-router-dom';

export default function scrollTop() {
    const { pathname } = useLocation();

    useEffect(() => {
        window.scrollTo(0, 0);
    }, [pathname])

    return null;
}

    1. Install react-scroll from https://www.npmjs./package/react-scroll

    2. Import and use in your ponent like below(ES6 style):

    import { Link, animateScroll as scroll } from "react-scroll";

<Link 
to="/" 
className='someDiv'
onClick={()=>scroll.scrollToTop()}>
Logo
</Link>
    1. Click on the element(here Logo) to see the magic.

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