Is there a way to use a variable as part of a value when setting state from props in ReactJS?

General Tech Bugs & Fixes 2 years ago

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manpreet Tuteehub forum best answer Best Answer 2 years ago

 

I am very new to React. I am trying to make a reusable Checkbox component. These checkboxes are to send info to an API. I have a GET command on App.JS, to set state.

Here is a simplified version of my API

{
 "devices":[
   {
    "id":1,
    "valveA": true,
    "valveB": false,
    "valveC": true,
   },
   {
    "id":2,
    "valveA": false,
    "valveB": true,
    "valveC": false,
   }

 ]
}

I pass the props to the children like so:

render() {
    const {devices} = this.state;
    return (       
          <div >
            {devices.map(device => (
              <Device device={device} key={device.id} />
            ))}
          div>     
    );

I can make individual components for each checkbox and setting the checked state by setting individual state like so:

 state = { checked: this.props.device.valveA }

But that means I have to make a component for each 'valve' in my API. Ideally I would like to have one Checkbox component that I can reuse for all my "valves".

I've made a semi-working component by specifying the name of the valve as a prop:

<Device device={device} key={device.id} switchFor="valveA" />

And here is my component that successfully passes the change to the API, however I need to dynamically set the last part of the setState

this.props.device.{{{I WANT THIS TO BE DYNAMIC}}}

, otherwise all switches just get the state of valveA:

state = { checked: false };

  componentDidMount(){

    this.setState({ checked: this.props.device.valveStatus })
  }


  handleCheckboxChange = event => {
    const type = this.props.switchFor;

    const checkedStatus = event.target.checked;

    const deviceID = this.props.device.id;

    const obj = {};
    obj[type] = checkedStatus;

    this.setState({ checked: checkedStatus });

    axios
      
                                                
                                                
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manpreet 2 years ago

 

Your explanation isn't really quite clear, but I think I can KIND OF understand what you're trying to do. If I'm wrong, just ignore me. So it seems like you want to be able to change which valve/switch of the device object to be displayed by your component. If that's the case, simply set that as a state. Off the top of my head, I can think of using a an array that mirrors your "devices" array:

this.state = {
    "devices":[
       {
        "id":1,
        "valveA": true,
        "valveB": false,
        "valveC": true,
       },
       {
        "id":2,
        "valveA": false,
        "valveB": true,
        "valveC": false,
       }
    ],
    "selectedValve": ["valveA", "valveB"]
}

Then when rendering your Device components, just do:

render() {
    const {devices} = this.state;
    return (       
          <div >
            {devices.map((device, ind) => (
              <Device device={device} key={device.id} switchFor={this.state.selectedValve[ind]} />
            ))}
          div>     
    );
}

To change the valve of a particular device, you can have:

handleSwitchChange(deviceInd, newValve){
    let copySelectedValve = [...this.state.selectedValve];
    copySelectedValve[deviceInd] = newValve;

    this.setState({
        selectedValve: copySelectedValve;
    })
}

To change the first device to valveB, you'd just do handleSwitchChange(0, "valveB"); To change the true/false of a valve of a device, you can write something like:


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