React array of refs

Question

i have read in a post on Stackoverflow question about refs

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 }}/>

but when i try it, it returns this error:

Uncaught TypeError: Cannot set property '0' of undefined

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

Does anyone know how to do this with the React.createRef() API? — horgen, Sep 19 '18 at 08:45
How would access this reference list in another function? say you want to refer to index 1, for instance!!! — dryleaf, Nov 30 '18 at 00:35

score 13 · Accepted Answer · answered Jul 26 '17 at 12:21

13

Create the array in you constructor, like:

constructor(){
  super()

  this.Progress = []
}

answered Jul 26 '17 at 12:21

CD..

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How would access this reference list in another function? say you want to refer to index 1, for instance!!! – dryleaf Nov 30 '18 at 00:36

score 1 · Answer 2 · answered Jul 26 '17 at 12:29

1

Progress array is not initialized, initialize it in constructor..

answered Jul 26 '17 at 12:29

Asim Khan

1,969
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React array of refs

2 Answers2