Changing style of a button on click

问题:

Is it possible to change background-color of my button onClick function?

ex. click background-color: black, another click background-color: white

I've tried something like this.style, no result.

I've managed to get overlay working and insert needed data inside of it. But didn't managed to find any post that could help me. I am using react-bootstrap. This is my code.

  const metaDataOverlay = (
  <div>
  <style type="text/css">{`
  .btn-overlay {
    background-color: white;
    margin-right: -15px;
    margin-left: -15px;
    padding-bottom: -20px;
    padding: 0;
  }
  `}</style>

      <ButtonToolbar>
        <ButtonGroup>
        <OverlayTrigger trigger={['hover', 'focus']} placement="left" overlay={popoverHoverFocus}>
          <Button bsStyle="overlay" onClick={ clicked } onKeyPress={ keypress }>
            <div className={bemBlocks.item().mix(bemBlocks.container("item"))} data-qa="hit">
              <a href={url} onClick={(e)=>{e.preventDefault(); console.log("123")}}>
                <div>
                  <img data-qa="poster" className={bemBlocks.item("poster")} src={result._source.poster} width="240" height="240"/>
                </div>
              </a>
            </div>
          </Button>
        </OverlayTrigger>
        </ButtonGroup>
      </ButtonToolbar>

    </div>
  )

回答1:

You can try to use state to store the color. Maybe this would give you the idea how to solve the problem :

class Test extends React.Component {
    constructor(){
        super();

        this.state = {
           black: true
        }
    }

    changeColor(){
       this.setState({black: !this.state.black})
    }

    render(){
        let btn_class = this.state.black ? "blackButton" : "whiteButton";

        return (
             <button className={btn_class} onClick={this.changeColor.bind(this)}>
                  Button
             </button>
        )
    }
}

React.render(<Test />, document.getElementById('container'));

Here is a fiddle.

回答2:

You also have access to event and current target of the event

handleClick = (event) => {
   // accessible
   event.target.style
   event.target.classList //to change style via css
}

回答3:

Here is another solution

changeStyles = () => {
    let element = document.getElementById('button')
    ReactDOM.findDOMNode(element).style.backgroundColor = this.state.isClicked?'black' : 'white'
}

In this way you can change only needed style property preventing duplicates in CSS.

回答4:

This is how you can access

    handleClick=(e)=>{
        console.log("this is working fine");
        e.preventDefault();
        e.target.style.color = 'black'
        console.log(e.target);
    }

If you want more dynamically you can initialize state with some default value of style afterwords use setState function to update your state