在 next.js 中获取 url 查询参数时遇到问题 [英] Having trouble getting url query parameter in next.js

问题描述

我只是想在我的 url 中获取参数的值.

我是 next.js 的新手，但总体来说还是很陌生.

我的网址是这样的:

localhost:3000/?code=VhXHWwRemC32dPmm3oj0mMravO6MP3

现在，我只是在渲染一个像这样的页面:

const Index = () =>{常量路由器 = useRouter();常量代码 = router.query.code;控制台.log(代码)；返回(
<p>代码:{code}</p><a href={Oauth.discord_login_url}登录</a></div>)};

只是为了让我看看我是否从 url 中正确获取了代码.

一旦我使用 discord 登录，我会返回到 Index，然后 url 看起来就像我在上面显示的那样.我正在尝试获取代码的价值，以便我可以使用它.让我困惑的是

<p>code: {code}</p>

成功在页面上显示code"的值.但是

console.log(code)

显示未定义.为什么不一样?

解决方案

尝试添加getInitialProps:

const Index = () =>{常量路由器 = useRouter();常量代码 = router.query.code;控制台.log(代码)；Index.getInitialProps = async() =>{返回 {};};返回 (
<p>代码:{code}</p><a href={Oauth.discord_login_url}>登录</a></div>)};

I am just trying to get the value of a parameter in my url.

I'm new to next.js and still fairly new to react in general.

My url looks like:

localhost:3000/?code=VhXHWwRemC32dPmm3oj0mMravO6MP3

Right now, I just am rendering a page like:

const Index = () => {
       const router = useRouter();
       const code = router.query.code;
       console.log(code);
       return(
       <div>
           <p>code: {code}</p>
           <a href={Oauth.discord_login_url}login</a>
           </div>)
        };

Just so I can see if I'm getting the code correctly from the url.

Once I log in with discord, I return to Index and the url then looks like what I showed above. I am trying to get the value of code so I can use it. What confuses me is that

<p>code: {code}</p> 

successfully displays the value of "code" on the page. But

console.log(code) 

shows undefined. Why is it different?

解决方案

Try to add getInitialProps:

const Index = () => {
  const router = useRouter();
  const code = router.query.code;
  console.log(code); 

  Index.getInitialProps = async () => {
    return {};
  };

 return ( 
   <div>
     <p>code: {code}</p> 
     <a href={Oauth.discord_login_url}>login</a>
   </div>
  ) 

};

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