How to update components props in storybook

Question

I am using storybook (this) to play with my components in isolation. I want to mock all the flux cycle (that in the full app it is done with the help of redux) and update a property using a simple object in the story, but I am missing something.

  storiesOf('Color picker', module).add('base', () => {
    let colorPickerState = {
      changeColor: function(data) {
        this.color = data.color
      },
      color: '#00aced'
    }
    return (
      <ColorPicker
        name="color"
        onChange={colorPickerState.changeColor.bind(colorPickerState)}
        value={colorPickerState.color}
      />
    )
  }

I expect the value prop of <ColorPicker /> to be updated when the onChange is called; I can see the value of colorPickerState.color being updated correctly, but the component does not re-render.

What am I missing?

Answer 1

You can write a dummy-component which will render the real story component inside it, and then you get to have that dummy-component's state property.

In the below example I'm using knobs addon in a story of a Slider component

stories.addDecorator(withKnobs)
    .add('Slider', () => {
        // create dummy component that wraps the Slider and allows state:
        class StoryComp extends React.Component {
            constructor( props ){
                super(props);

                this.state = {
                    value : this.props.value || 0,
                }
            }

            onValueChange = value => this.setState({ value })

            render(){
                const props = {
                    ...this.props, 
                    onValueChange:this.onValueChange, // <--- Reason "StoryComp" is needed
                    value:this.state.value            // <--- Reason "StoryComp" is needed
                }

                return <Slider {...props} />
            }
        }

        // knobs (customaziable props)
        const widthKnobOptions = {
            range : true,
            min   : 200,
            max   : 1500,
            step  : 1
        }

        const props = {
            value : number('value', 200000),
            min   : number('min', 100),
            step  : number('step', 1000),
            max   : number('max', 1000000),
            width : number('width', 700, widthKnobOptions)
        }

        return <StoryComp {...props} />
    }
);