How to add or remove a className on event in ReactJS?

Question

I am quite new to React and I am struggling a little with converting my thinking from standard js.

In my react component I have the following element:

Answer 1

The list of classes can be derive from the state of the component. For example:

var Component = React.createClass({
  getInitialState: function() {
    return {
      clicked: false
    };
  },

  handleClick: function() {
    this.setState({clicked: true});
  },

  render: function() {
    var className = this.state.clicked ? 'click-state' : 'base-state';
    return 
click here
;
  }
});

Calling this.setState will trigger a rerender of the component.