title: How to get value from Select/Option component from Ant design
body: <p>I want to retrieve the value from my selection so I can make post requests. I have no problem getting from text input, but for some reason I can't get it from the drop down menu select. I end up getting a 
  <code>"TypeError: Cannot read property 'value' of undefined"</code></p>
  
  <p>Here is the code I am using. </p>
  
  <pre><code>import React from "react";
  import { Form, Input, Button, Select } from "antd";
  
  const { Option } = Select;
  
  class ItemForm extends React.Component {
  
    handleFormSubmit = event =&gt; {
      event.preventDefault();
      const name = event.target.elements.name.value;
      const description = event.target.elements.description.value;
      const category = event.target.elements.category.value;
      console.log(name, description, this.refs.category.value);
    };
  
    render() {
      return (
        &lt;div&gt;
          &lt;Form onSubmit={this.handleFormSubmit}&gt;
            &lt;Form.Item label="Form Layout" /&gt;
            &lt;Form.Item label="Product Name"&gt;
              &lt;Input name="name" placeholder="Ex: Organic Apple..." /&gt;
            &lt;/Form.Item&gt;
            &lt;Form.Item label="Description"&gt;
              &lt;Input name="description" placeholder="Ex: Juicy organic apples!" /&gt;
            &lt;/Form.Item&gt;
            &lt;Form.Item label="Category"&gt;
              &lt;Select name="category" placeholder="Please select a category"&gt;
                &lt;Option value="Fruit"&gt;Fruit&lt;/Option&gt;
                &lt;Option value="Vegetable"&gt;Vegetable&lt;/Option&gt;
                &lt;Option value="Poultry"&gt;Poultry&lt;/Option&gt;
              &lt;/Select&gt;
            &lt;/Form.Item&gt;
            &lt;Form.Item&gt;
              &lt;Button type="primary" htmlType="submit"&gt;
                Submit
              &lt;/Button&gt;
            &lt;/Form.Item&gt;
          &lt;/Form&gt;
        &lt;/div&gt;
      );
    }
  }
  export default ItemForm;
  </code></pre>