在React中单击按钮时显示组件

我是新来的反应者.仅在单击按钮后才如何渲染组件?

I am new to react. How to render a component only after clicking a button in react?

在这种情况下，单击按钮时，我必须显示一个表，该表显示数据库中的数据.

Here in my case on clicking a button I have to display a table which displays the data from the database.

我在下面附加了我的代码供您参考，第一个组件是按钮组件，而在下面您可以找到表格的组件.

I have attached my code below for your reference, the first component is the button component and below that you can find the components for the table.

我还想知道如何在单击按钮时刷新组件而不刷新整个页面.

Also I would like to know how to refresh a component on clicking a button without refreshing the entire page.

var Button = React.createClass({
render: function () {
        return (
           <button type="button">Display</button>

            ); }
});

var EmployeeRow = React.createClass({

    render: function () {
        return (
            <tr>
                  <td>{this.props.item.EmployeeID}</td>
                  <td>{this.props.item.FirstName}</td>
                  <td>{this.props.item.LastName}</td>
                  <td>{this.props.item.Gender}</td>                                                   
              </tr>

            );
    }
});

  var EmployeeTable = React.createClass({

      getInitialState: function(){

          return{
              result:[]
          }
      },
      componentWillMount: function(){

          var xhr = new XMLHttpRequest();
          xhr.open('get', this.props.url, true);
          xhr.onload = function () {
              var response = JSON.parse(xhr.responseText);

              this.setState({ result: response });

          }.bind(this);
          xhr.send();
      },
      render: function(){
          var rows = [];
          this.state.result.forEach(function (item) {
              rows.push(<EmployeeRow key={item.EmployeeID} item={item} />);
          });
          return (
<Button />
  <table className="table">
     <thead>
         <tr>
            <th>EmployeeID</th>
            <th>FirstName</th>
            <th>LastName</th>
            <th>Gender</th>               
         </tr>
     </thead>
      <tbody>
          {rows}
      </tbody>
  </table>

  );
  } });

  ReactDOM.render(<EmployeeTable url="api/Employee/GetEmployeeList" />,
          document.getElementById('grid'))