Change readonly attribute of input element: ReactJS

Question

I want to add or remove an attribute from an html input element.

What i'm done is this:

constructor(props) {
    super(props);
    this.state = {inputState: 'readOnly'};
}

And the render function:

<input className="form-control" type="text" value={floor} {...this.state.inputState} />

As you can see i want set the "readOnly" attribute on the input element. But now i get an error which says:

Unknown props 0, 1, 2, 3, 4, 5, 6, 7 on tag. Remove these props from the element

When an user is clicking on the input element it should become editable, so i want to dynamicly change this attribute.

But how can i do that?

If you really want to spread the state. Simply do: <input className="form-control" type="text" value={floor} {...this.state} /> — Hemerson Carlin
– Hemerson Carlin, Commented Sep 7, 2017 at 10:37

Mayank Shukla · Accepted Answer · 2017-09-07 10:16:23Z

To control the mode of input element define readOnly attribute with it and control it's value by state variable, Whenever you update the state value react will re-render the component and it will change the mode on the basis of state value.

Check this example:

class App extends React.Component{
  constructor(){
    super();
    this.state = {readOnly: true}
    this._click = this._click.bind(this);
  }

  _click(){
     this.setState(prevState => ({readOnly: !prevState.readOnly}))
  }
  
  render(){
     return <div>
        <input readOnly={this.state.readOnly}/>
        <button onClick={this._click}>Toggle</button>
     </div>
  }
}

ReactDOM.render(<App/>, document.getElementById('app'))

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id='app'/>

An Nguyen · Accepted Answer · 2017-09-07 10:08:12Z

0

Try this instead:

this.state = { inputState: { readOnly: true }};

answered Sep 7, 2017 at 10:08

An Nguyen

1,47810 silver badges21 bronze badges

Comments

bennygenel · Accepted Answer · 2017-09-07 10:13:28Z

0

You can try this.

constructor(props) {
    super(props);
    this.state = {readOnly: true};
}

render() {
    return (<input className="form-control" type="text" value={floor} readOnly={this.state.readOnly} />)
}

answered Sep 7, 2017 at 10:13

bennygenel

24.8k7 gold badges68 silver badges80 bronze badges

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