问题描述
我正在尝试使用React refs在安装时聚焦Redux-Form字段。
I am trying to use React refs to focus a Redux-Form Field when it mounts.
当我在 this.refs.title.getRenderedComponent()。focus()时> componentDidMount ,抛出错误说:
When I try this.refs.title.getRenderedComponent().focus()
in componentDidMount
, an error is thrown saying:
edit_fund.js:77 Uncaught TypeError:无法读取属性'getRenderedComponent 'of undefined
当我在console.log this.refs时,它主要是一个空对象,有时将'title'标识为ref ,但它不可靠。
When I console.log this.refs, it is mostly an empty object and sometimes identifies 'title' as being a ref, but it is not dependable.
我错误地使用了参考号吗?我的代码在下面供参考。
Am I using refs incorrectly? My code is below for reference.
componentDidMount = () => {
this.refs.title
.getRenderedComponent()
.focus();
}
...
<Field
id="title"
name="title"
component={FormInput}
type="text"
ref="title" withRef
/>
推荐答案
请尝试使用回调函数设置ref:
Please try setting ref using callback function:
ref={(input) => { this.title = input; }}
然后用它来获取底层DOM节点:
and then use this to get underlying DOM node:
ReactDOM.findDOMNode(this.title).focus();
如果DOM输入元素包含在另一个元素中:
of if DOM input element is wrapped in another element:
ReactDOM.findDOMNode(this.title).getElementsByTagName("input")[0].focus()
根据React docs使用带有字符串的refs有一些问题。请查看了解更多详情。
According to React docs using refs with a string have some issues. Please check docs for more details.
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