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useRef 使用中.current 始终是null #4772

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lfxlove opened this issue Nov 6, 2019 · 2 comments
Closed

useRef 使用中.current 始终是null #4772

lfxlove opened this issue Nov 6, 2019 · 2 comments

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@lfxlove
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lfxlove commented Nov 6, 2019

这个是文档中的示例,代码如下

function TextInputWithFocusButton() {
const inputEl = useRef(null);
const onButtonClick = () => {
// current 指向已挂载到 DOM 上的文本输入元素
inputEl.current.focus();
};
return (


Focus the input

);
}

报错结果如下
TypeError: Cannot read property 'focus' of null
at TextInputWithFocusButton.anonymousFunc0

@taro-bot
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taro-bot bot commented Nov 6, 2019

欢迎提交 Issue~

如果你提交的是 bug 报告,请务必遵循 Issue 模板的规范,尽量用简洁的语言描述你的问题,最好能提供一个稳定简单的复现。🙏🙏🙏

如果你的信息提供过于模糊或不足,或者已经其他 issue 已经存在相关内容,你的 issue 有可能会被关闭。

Good luck and happy coding~

@Chen-jj
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Chen-jj commented Nov 6, 2019

same issue #4466

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