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 get the length of the text inside the React component - Stack Overflow

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    javascript - How to get the length of the text inside the React component - Stack Overflow

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    I have React ponent, where I have some dynamic text:

    ...
let spanLength

return(
  <SomeComp>
     ...
     <span>Some static text: {someDynamicText}, {someAnotherText}</span>
     ...
  </SomeComp>
)

    How can I get the length of text inside span element to a spanLength variable?

    I have React ponent, where I have some dynamic text:

    ...
let spanLength

return(
  <SomeComp>
     ...
     <span>Some static text: {someDynamicText}, {someAnotherText}</span>
     ...
  </SomeComp>
)

    How can I get the length of text inside span element to a spanLength variable?

    • javascript
    • reactjs
    Share Improve this question asked May 20, 2019 at 9:00 Volodymyr HumeniukVolodymyr Humeniuk 3,79112 gold badges41 silver badges76 bronze badges
    Add a ment  | 

    2 Answers 2

    Reset to default 8

    You can add a ref to your span

    let spanRef = React.createRef()
...
<span ref={spanRef}>Some static text: {someDynamicText}, {someAnotherText}</span>

    Then the text length would simply be spanRef.current.textContent.length

    Why not, first, pose the whole string? You can grab its length immediately after, and then render it.

    const spanStr = `Some static text: ${someDynamicText}, ${someAnotherText}`;
const spanLength = spanStr.length;

return(
  <SomeComp>
     ...
     <span>{spanStr}</span>
     ...
  </SomeComp>
)

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