红色报警react-modal: App element is not defined. Please use `Modal.setAppElement(el)` or set `appElement={el}`.

在React项目中出现这个红色warning:

Warning: react-modal: App element is not defined. Please use `Modal.setAppElement(el)` or set `appElement={el}`. This is needed so screen readers don‘t see main content when modal is opened. It is not recommended, but you can opt-out by setting `ariaHideApp={false}`.

红色报警react-modal: App element is not defined. Please use `Modal.setAppElement(el)` or set `appElement={el}`.

 

 

 解决办法:

...
import ReactModal from ‘react-modal‘;
...
class App extends Component {
componentWillMount() {
  //办法2:
  ReactModal.setAppElement(document.body); //setAppElement()函数是静态的,一个class设置一遍即可
}
render(){ ... <ReactModal
    //办法之1:
    appElement={document.body} className
="modal" overlayClassName="overlay" isOpen={foodModalOpen} onRequestClose={this.closeFoodModal} contentLabel="Modal" > ... } }

在本人的实际项目中:父模块和子模块使用的package.json依赖包都是相同的,父模块必须引入子模块的react-modals,这样才能整个项目中使用统一的一个class。

项目全局搜索:

WrappedGui.setAppElement = ReactModal.setAppElement;

 

红色报警react-modal: App element is not defined. Please use `Modal.setAppElement(el)` or set `appElement={el}`.

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