onClick不会呈现新的反应组件。 [英] onClick doesn't render new react component.

问题描述

我是新来的反应世界，我有这样的行：

I'm new to react world and I have line like this:

<Button onClick={() => console.log("hello")}>Button</Button>

点击后你会得到你好打印在控制台上。现在将行更改为：

and on click you will get hello printed on the console. Now change the line to:

<Button onClick={() => <NewComponent />}>Button</Button>

现在单击按钮，我希望 NewComponent 要渲染。但事实并非如此。

now on click on the button, I expect the NewComponent to be rendered. But it doesn't.

我不确定，为什么会这样。请注意，我在 render 方法中有上述代码。

I'm not sure, why that is the case. Note that I have the above code in the render method.

推荐答案

您可能希望有一个有状态的组件，在单击按钮后显示该按钮旁边的其他组件。您需要做的就是跟踪按钮是否被点击：

You probably want to have a stateful component that shows the other component next to the button after it was clicked. All you need to do is track whether the button was clicked:

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      showComponent: false,
    };
    this._onButtonClick = this._onButtonClick.bind(this);
  }

  _onButtonClick() {
    this.setState({
      showComponent: true,
    });
  }

  render() {
    return (
      <div>
        <Button onClick={this._onButtonClick}>Button</Button>
        {this.state.showComponent ?
           <NewComponent /> :
           null
        }
      </div>
    );
  }
}

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