How can I remove an attribute from a React component’s state object

by

You can set foo to undefined, like so 

var Hello = React.createClass({
    getInitialState: function () {
        return {
            foo: 10,
            bar: 10
        }
    },

    handleClick: function () {
        this.setState({ foo: undefined });
    },

    render: function() {
        return (
            <div>
                <div onClick={ this.handleClick.bind(this) }>Remove foo</div>
                <div>Foo { this.state.foo }</div>
                <div>Bar { this.state.bar }</div>
            </div>
        );
    }
});

Example

Update

The previous solution just remove value from foo and key skill exists in state, if you need completely remove key from state, one of possible solution can be setState with one parent key, like so

var Hello = React.createClass({
  getInitialState: function () {
    return {
      data: {
        foo: 10,
        bar: 10
      }
    }
  },
    	
  handleClick: function () {
    const state = {
      data: _.omit(this.state.data, 'foo')
    };
    
    this.setState(state, () => {
      console.log(this.state);
    });
  },
        
  render: function() {
    return (
      <div>
        <div onClick={ this.handleClick }>Remove foo</div>
        <div>Foo { this.state.data.foo }</div>
        <div>Bar { this.state.data.bar }</div>
      </div>
    );
  }
});

ReactDOM.render(<Hello />, document.getElementById('container'))
<script src="https://cdn.jsdelivr.net/lodash/4.17.4/lodash.min.js"></script>
<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="container"></div>

Leave a Comment