reactjs – 从React组件中的外部加载的HTML访问内部函数

我有以下用例.

来自第三方源的一些HTML被加载到我的React组件中：

class MyComponent extends Component {
  render() {
    return (
      <div
        dangerouslySetInnerHTML={{ __html: this.props.externalHTML }}
      />
    );
  }
}

在外部加载的HTML中,存在特定范围的单击事件,该事件应该调用我的应用程序中存在的回调函数.

<span onclick="myCallback(param1='asd', param2=123, param3='asdas')">
  Click me!
</span>

我应该把这个myCallback函数放在哪里？

如果我将它放在组件类中,我在单击span时会出现以下错误,因为据我所知,该函数对于外部加载的HTML是不可见的：Uncaught ReferenceError：mySpallback未在HTMLSpanElement.onclick中定义

我的另一个想法是将函数添加到窗口对象window.myCallback = …在我的主index.js文件中,每次加载应用程序时都要加载.这种方式有效,但我有两个问题.

>我的理解是,这不是正确的React方法.
>每当我单击span元素时,回调函数会被触发两次,我无法理解为什么.

有什么建议？

使用“dangerouslySetInnerHTML”是……“危险”的名称^^,它实际上不是纯粹的React方式.

但是,如果你必须这样做,你可以做这样的事情(利用React内置的jQuery是默认的)

=====

从这里编辑版本:(仅使用1个组件)

export default class MyComponent extends Component {
  componentDidMount() {
    // using jQuery to manipulate DOM element form third-party source
    // NB. you may think of using setTimeout here, to wait for the external source to be fully loaded here, of course it's not so safe
    // but anyway, we are using "dangerouslySetInnerHTML" anyway => quite dangerous, though ^^  

    // setTimeout(function(){   
      $(document.findElementsByTagName("span")[0]).click(function(e){ 
      // or perhaps $("#spanID").click if you can, just be careful between DOM element and react component

          e.preventDefault();
          // DO SOMETHING HERE, just like you do in the window.onload function
          // or maybe you also need to get param values by getting $(this).data("...") or $(this).attr("ATTRIBUTE-NAME")
          return false;

      });
    // });
  }
  render() {
    return (
      <div
        dangerouslySetInnerHTML={{ __html: this.props.externalHTML }}
      />
    );
  }
}

=====

从这里回答:(使用2个组件)

为父级：

export default class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.callbackOnThisComponent = this.callbackOnThisComponent.bind(this);
  }
  callbackOnThisComponent(param1, param2, param3) {
    // do whatever you like with the above params
  }
  render() {
    return (
      <ChildComponent triggerCallbackOnParent={this.callbackOnThisComponent} />
    );
  }
}

ChildComponent：

export default class ChildComponent extends Component {
  componentDidMount() {
    // using jQuery to manipulate DOM element form third-party source

    let that = this;

    // NB. you may think of using setTimeout here, to wait for the external source to be fully loaded here, of course it's not so safe
    // but anyway, we are using "dangerouslySetInnerHTML" anyway => quite dangerous, though ^^  

    $(document.findElementsByTagName("span")[0]).click(function(e){ 
    // or perhaps $("#spanID").click if you can, just be careful between DOM element and react component

        e.preventDefault();
        that.props.triggerCallbackOnParent(param1, param2, param3);
        // or maybe you need to get param values by getting $(this).data("...") or $(this).attr("ATTRIBUTE-NAME")
        return false;

    }, that);

  }
  render() {
    return (
      <div
        dangerouslySetInnerHTML={{ __html: this.props.externalHTML }}
      />
    );
  }
}

我只是使用React的主要思想,它将props向下传递给子组件,当你想从子组件向上触发一个函数时,在parent上创建一个回调函数.对于您或其他任何人的参考,这是我演示如何将回调函数从父级传递到多级子组件：

Force React container to refresh data

Re-initializing class on redirect

如果这还不行,请随时向我显示一些错误日志,谢谢