如何向聚焦输入字段的父div动态添加类?

Below is my form.jsx file

下面是我的形式。jsx文件

var React = require('react');
var Input = require('./input');

module.exports = React.createClass({
    getInitialState: function() {
        return {
            focus: false
        }
    },
    render: function () {
        return <div className="info_input">
            <div className="demo demo2 lll">
                  <div className={"css " + (this.state.focus ? "active" : "")}>
                    <label htmlFor="d3">{this.props.firstCol}</label>
                    <Input id="d3" type="text" handleFocus={this.addClass} handleBlur={this.removeClass} />
                  </div>
            </div>
                <div className="demo demo2">
                  <div className={"css " + (this.state.focus ? "active" : "")}>
                    <label htmlFor="d3">{this.props.secondCol}</label>
                    <Input id="d3" type="text" />
                  </div>
                </div>
                <div className="clear"></div>
        </div>
    },
    addClass: function () {
            this.setState({
            focus: true
        });
    },
    removeClass: function () {
        this.setState({
            focus: false
        });
    }
});
var