javascript - gatsby-react-helmet 在 SSR 上生成空 <title>

Question

我的 Gatsby 网站没有在 SSR 上生成正确的标题标签。当我建立网站时，我得到的所有生成文件都是 <title data-react-helmet="true"></title> .我很感激帮助找到问题并解决，因为经过长时间的调试过程后我不知道哪个可能是问题所在。

相关文件:

package.json

...
"dependencies": {
  "gatsby": "^2.19.45",
  "gatsby-image": "^2.2.44",
  "gatsby-plugin-manifest": "^2.2.48",
  "gatsby-plugin-react-helmet": "^3.2.2",
  "gatsby-plugin-sharp": "^2.4.13",
  "gatsby-plugin-sitemap": "^2.3.1",
  "gatsby-plugin-typescript": "^2.3.3",
  "gatsby-source-filesystem": "^2.1.56",
  "gatsby-source-graphql": "^2.2.0",
  "react": "^16.12.0",
  "react-dom": "^16.12.0",
  "react-helmet": "^6.0.0",
}
...

gatsby.config.js

  plugins: [
    `gatsby-plugin-react-helmet`,
    ...
  ]

(gatsby-plugin-offline 已禁用)

Seo.tsx

import React from "react"
import { Helmet } from "react-helmet"
import { useStaticQuery, graphql } from "gatsby"

interface Props {
  title: string
  description?: string
  image?: string
}

const SEO = ({ title, description, image }: Props) => {
  const { site } = useStaticQuery(
    graphql`
      query {
        site {
          siteMetadata {
            title
            description
            image
            siteUrl
          }
        }
      }
    `
  )

  const metaDescription = description || site.siteMetadata.description
  const shareImage = image || site.siteMetadata.image
  const url = site.siteMetadata.siteUrl

  return (
    <Helmet defer={false}>
      <title>{title}</title>
      <meta name="description" content={metaDescription} />
      <meta name="image" content={shareImage} />
      <link rel="canonical" href={url} />
      <meta property="og:url" content={url} />
      <meta property="og:type" content="website" />
      <meta property="og:title" content={title} />
      <meta property="og:description" content={metaDescription} />
      <meta property="og:image" content={shareImage} />
      <meta name="twitter:card" content="summary_large_image" />
      <meta name="twitter:title" content={title} />
      <meta name="twitter:description" content={metaDescription} />
      <meta name="twitter:image" content={shareImage} />
    </Helmet>
  )
}

export default SEO

改变 <title>{title}</title>至 <Helmet title={title}>或者删除 defer={true}不会改变任何结果。

gatsby-ssr.js

import React from "react"
import { Helmet } from "react-helmet"

export const onRenderBody = (
  { setHeadComponents, setHtmlAttributes, setBodyAttributes },
  pluginOptions
) => {
  const helmet = Helmet.renderStatic()
  setHtmlAttributes(helmet.htmlAttributes.toComponent())
  setBodyAttributes(helmet.bodyAttributes.toComponent())
  setHeadComponents([
    helmet.title.toComponent(),
    helmet.link.toComponent(),
    helmet.meta.toComponent(),
    helmet.noscript.toComponent(),
    helmet.script.toComponent(),
    helmet.style.toComponent()
  ])
}

我仍然遇到空 srr 文件的问题。

在任何给定的页面上，我调用 SEO 标记，例如:

<SEO title="Hello World" description="Foo Bar" />

Answer 1

你能试试像 title = {title} 这样的东西把它作为 Helm 的 Prop 而不是像上面那样作为标题标签传递吗

  <Helmet
      htmlAttributes={{
        lang,
      }}
      title={title}
      titleTemplate={`%s | ${site.siteMetadata.title}`}
      meta={[
        {
          name: `description`,
          content: metaDescription,
        },
        {
          property: `og:title`,
          content: title,
        },
        {
          property: `og:description`,
          content: metaDescription,
        },
        {
          property: `og:type`,
          content: `website`,
        },
        {
          name: `twitter:card`,
          content: `summary`,
        },
        {
          name: `twitter:creator`,
          content: site.siteMetadata.author,
        },
        {
          name: `twitter:title`,
          content: title,
        },
        {
          name: `twitter:description`,
          content: metaDescription,
        },
      ].concat(meta)}
    />

Gatsby Starter 默认模板有一个很好的 SEO 组件，您也可以引用。