How can I add meta tags for sharing a particular link in React.js?

问题

Say, I have an online shop application built with React.js and I want to customize the look of the URL that is shared on social media (e.g. add a description and an image) using HTML meta tags. Besides, I want the route of particular product (e.g. https://www.mywebsite.com/product/<productId>) to preview the appropriate picture and description of it, so it is not acceptable to just include the meta tags in the index.html.

I have tried to use react-helmet and other packages that are used for adding meta tags, but they didn't help. I guess, it is because react-helmet adds the meta tags after the app renders and not just when the URL is shared somewhere.

Is the only solution to this problem to use server-side rendering or there is a way to handle it from front-end only?

回答1:

Follow the below example step by step to do the same

Step 1 – Install below command Using NPM

npm install react-meta-tags --save

Note: You can also achieve this using React Helmet (a third party library)

Step 2 – Use MetaTag Component in your class Component

import React from 'react';
import MetaTags from 'react-meta-tags';

class Component1 extends React.Component {
  render() {
    return (
        <div className="wrapper">
          <MetaTags>
            <title>Your Page 1</title>
            <meta name="description" content="Your description here.." />
            <meta property="og:title" content="Your App" />
            <meta property="og:image" content="Your path/to/image.jpg" />
          </MetaTags>
          <div className="content"> Your Content here... </div>
        </div>
      )
  }
}

Note: Define id on tags so if you navigate to other page, older meta tags will be replaced/update by new ones.

Step 3 - ReactTitle Component:

If you just want to add title on a page you can use ReactTitle instead.

import React from 'react';
import {ReactTitle} from 'react-meta-tags';

class Component2 extends React.Component {
  render() {
    return (
        <div className="wrapper">
          <ReactTitle title="Your Page 2"/>
          <div className="content"> Your Page 2 Content </div>
        </div>
      )
  }
}

The Server Usage Example:

import MetaTagsServer from 'react-meta-tags/server';
import {MetaTagsContext} from 'react-meta-tags';

/* Import other required modules */
/*  some serve specific code */

app.use((req, res) => {
  //make sure you get a new metatags instance for each request
  const metaTagsInstance = MetaTagsServer();

  //react router match
  match({
    routes, location: req.url
  }, (error, redirectLocation, renderProps) => {
    let reactString;

    try{
      reactString = ReactDomServer.renderToString(
      <Provider store={store}> 
      {/*** If you are using redux ***/}
      {/* You have to pass extract method through MetaTagsContext so it can catch meta tags */}

        <MetaTagsContext extract = {metaTagsInstance.extract}>
          <RouterContext {...renderProps}/>
        </MetaTagsContext>
      </Provider>
      );
    }
    catch(e){
      res.status(500).send(e.stack);
      return;
    }

    //get all title and metatags as string
    const meta = metaTagsInstance.renderToString();

    //append metatag string to your layout
    const htmlStr = (`
      <!doctype html>
      <html lang="en-us">
        <head>
          <meta charSet="utf-8"/>
          ${meta}
        </head>
        <body>
          <div id="content">
            ${reactString}
          </div>
        </body>
      </html>  
    `);

    res.status(200).send(layout);
  });
});

As per the above code we have to do following for server rendering options

Import MetaTagsServer form server
Import MetaTagsContext form server
Create a new instance of MetaTagsServer
Wrap your component inside MetaTagsContext and pass extract method as props
Extract Meta string using renderToString of MetaTagsServer instance
Append Meta string to your html template.

JSX Layout:

You might also be using React to define your layout, in which case you can use getTags method from metaTagsInstance. The layout part of above server side example will look like this.

//get all title and metatags as React elements
const metaTags = metaTagsInstance.getTags();

//append metatag string to your layout
const layout = (
  <html lang="en-us">
    <head>
      <meta charSet="utf-8"/>
      {metaTags}
    </head>
    <body>
      <div id="app" dangerouslySetInnerHTML={{__html: reactString}} />
    </body>
  </html>  
);

const htmlStr = ReactDomServer.renderToString(layout);

res.status(200).send(htmlStr);

来源：https://stackoverflow.com/questions/60045028/how-can-i-add-meta-tags-for-sharing-a-particular-link-in-react-js

标签

html

reactjs

react-router

meta-tags

react-helmet