反应参考数组 [英] React array of refs

问题描述

我已经阅读了Stackoverflow上的帖子

i have read in a post on Stackoverflow question about refs

我们可以使用类似以下代码的东西来将ref数组分配给这样的不同输入:

that we can use something like the following code to assign an array of refs to different inputs like this:

<Progressbar completed={25} id="Progress1" ref={(input) => {this.Progress[0] = input }}/>

<Progressbar completed={50} id="Progress2" ref={(input) => {this.Progress[1] = input }}/>

<Progressbar completed={75} id="Progress3" ref={(input) => {this.Progress[2] = input }}/>

但是当我尝试它时，它将返回此错误:

but when i try it, it returns this error:

Uncaught TypeError: Cannot set property '0' of undefined

它不起作用，我缺少什么吗?

and it doesn't work, am I missing something?

推荐答案

在构造函数中创建数组，例如:

Create the array in you constructor, like:

constructor(){
  super()

  this.Progress = []
}

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