onFocus and onBlur does not render in react

Is this what you are looking for?

var Foo = React.createClass({
  getInitialState: function () {

    return {
      type: 'text'
    };
  },
  onFocus: function () {

    this.setState({
      type: 'date'
    });
  },
  onBlur: function () {

    this.setState({
      type: 'text'
    });
  },
  render: function () {

    return(
      <input 
        type={ this.state.type } 
        onFocus={ this.onFocus } 
        onBlur={ this.onBlur } 
        placeholder="Enter your date here."
      />
    )
  }
});

React.render(<Foo/>, document.body);

As I’ve commented above, the render method triggers the first time and after that on every state change (and if shouldComponentRender returns true in case if it’s implemented):

https://facebook.github.io/react/docs/component-specs.html