ReactDom createPortal() 不起作用但 render() 起作用，并且只有在重复触发时才会起作用 - 这是为什么？

Question

新手在这里反应。

TLDR：我有一个名为 createNotification 的辅助函数，调用时使用 render() 将 <ToastNotification /> 组件插入到 container 元素中。如果我使用 createPortal() ，则不会附加任何内容。如果我使用渲染，尽管有多个触发器，组件只添加一次。

谁能帮我弄清楚发生了什么事？

谢谢

helpers.js


import { ToastNotification } from "carbon-components-react";
import { render, createPortal } from "react-dom";

export const createNotification = () => {
  const container = document.getElementById("notificationContainer");
  console.log(container); //just to check function is running and has found container
  return render(<ToastNotification />, container); //works but only once, not on multiple triggers
  return createPortal(<ToastNotification />, container); //doesn't render anything in container
};

上面的函数根据需要从其他组件调用：

login.js

import { createNotification } from "../../helpers";

const Login = () => {
  const validateLogin = async (event) => {
    createNotification();
    // validation logic
    performLogin();
  };

  const performLogin = async () => {
    //axios call here
  };

  // main component content
  return (
    <>
     <!-- validateLogin() called on form submit -->
    </>
  );
};

export default Login;

app.js

//imports

function App() {
  return (
    <div>
      <div className="App"></div>
    </div>
  );
}
export default App;

谢谢

Answer 1

通过在 render().

中添加 createPortal() 自己解决了这个问题

如果有人能提供解释，将不胜感激。

export const createNotification = () => {
  const container = document.getElementById("notificationContainer");
  console.log(container);
  return render(createPortal(<ToastNotification />, container), document.createElement("div"));
};

Answer 2

createNotification 未安装在虚拟应用程序的组件中 Dom...当您使用 render(createPortal) 时，您只需创建 spearted 应用程序。

import { createNotification } from "../../helpers";

export const createNotification = () => {
    const container = document.getElementById("notificationContainer");
    console.log(container); //just to check function is running and has found container
    return createPortal(<ToastNotification />, container); //doesn't render anything in container
};

const Login = () => {
    const [validate, setValidate] = useState(false);
    
    const validateLogin = async (event) => {
        if('some logic')
            return setValidte(true)
        setVAlidte(false)
    };


    useEffect(() => {
        if(!valite)
            return;
        //axios heare
    }, [validate])
    // main component content
    
    
    return (
        <>
            {!validate && <CreateNotfication/>}
            <!-- validateLogin() called on form submit -->
        </>
    );
};

ReactDom createPortal() 不起作用但 render() 起作用，并且只有在重复触发时才会起作用 - 这是为什么？

ReactDom createPortal() doesn't work but render() does, and only once not if trigger is repeated - why is this?

javascript

reactjs

react-dom

carbon-design-system