I have another question in the project I'm doing, using NextJS to create a site with a blog part in Wordpress, through WPGraphQL, and I need support in a specific part. Let's go...
I managed to pull the highlighted image with almost no problems, I broke my head a bit, but it worked. The result that's functioning is the post excerpt, the code and the query were as follows (in time: image merely to test, it was the first idea that came to my mind, the site is not about Pokemon):
Image with working image in the excerpt, codes below
NextJS code:
import { LastPosts, PostContainer } from "./Styled";
const RecentBlogPosts = ({lastPosts}) => {
const posts = lastPosts;
return (
<LastPosts>
<h1> ÚLTIMAS POSTAGENS </h1>
{posts?.map((post) => {
return (
<PostContainer key={post.slug}>
<img src={post.featuredImage?.node.sourceUrl} alt="" />
<Link href={`/post/${post.slug}`}>
<a>
<h3> { post.title } </h3>
<div dangerouslySetInnerHTML={{ __html: post.excerpt }} />
<button> Saiba mais </button>
</a>
</Link>
</PostContainer>
)
})}
</LastPosts>
)
};
export default RecentBlogPosts;
Query for this part:
export const RECENT_POSTS = `query RecentPosts {
posts(where: {orderby: {field: DATE, order: DESC}}, first: 2) {
nodes {
id
slug
title
excerpt
featuredImage {
node {
sourceUrl
}
}
}
}
}`;
But I tried to pull the same image in the full blogpsot and it wasn't working... It appears when I view the post from the generic WordPress admin template, but not at my NextJS site, which i See through localhost:3000/post/[here would be the post title in slug] that I'm using. The rest is normal, text with all fonts and specifications with styled components, as well as tags, they work without any problem. The following is the same schema: image with result, code and query that I am using, this time for the part where I'm having problems:
Image with blogpost not working, codes below
NextJS code:
import fetcher from "../../lib/fetcher";
import { GET_ALL_POSTS_WITH_SLUG, POST_BY_SLUG } from "../../lib/wordpress/api";
import { useRouter } from "next/router";
import { Reset } from "../../constants/StyledConstants";
import Header from "../../components/Header/Header";
import { BlogArticle, BlogPostContent, TagLinks, TagWrapper } from "./StyledPost";
import Footer from "../../components/Footer/Footer";
const post = ({ postData }) => {
const blogPost = postData.data.post;
console.log(postData);
const tags = postData.data.post.tags.nodes;
const router = useRouter;
if(!router.isFallback && !blogPost?.slug) {
return <div>erro</div>
}
return (
<>
<Reset />
<Header />
<BlogPostContent>
{router.isFallback ? (
<div> Carregando...... </div>
) : (
<div>
<h1> { blogPost.title } </h1>
<img src={post.featuredImage?.node.sourceUrl} alt="imagem não aparece" />
<BlogArticle dangerouslySetInnerHTML={{ __html: blogPost.content }} />
<TagWrapper>
{tags.map((tag) => <TagLinks href={`/tags/${tag.slug}`} key={tag.slug}> { tag.name } </TagLinks>)}
</TagWrapper>
</div>
)}
</BlogPostContent>
<Footer />
</>
)
}
export default post;
export async function getStaticPaths() {
const response = await fetcher(GET_ALL_POSTS_WITH_SLUG);
const allposts = await response.data.posts.nodes;
return {
paths: allposts.map((post) => `/post/${post.slug}`) || [],
fallback: false
};
}
export async function getStaticProps({ params }) {
const variables = {
id: params.slug,
idType: "SLUG"
};
const data = await fetcher(POST_BY_SLUG, { variables })
return {
props: {
postData: data
},
};
}
Query being used:
export const POST_BY_SLUG = `query PostBySlug($id: ID!, $idType: PostIdType!) {
post(id: $id, idType: $idType) {
title
slug
date
content
featuredImage {
node {
sourceUrl
}
}
tags {
nodes {
name
slug
}
}
}
}`;
I tried to use {post.featuredImage?.node.sourceUrl} because, as far as I understand, following the same basis I did for the excerpt in the blogspot, it should work, but I guess I was wrong... I tried to think of other ways to do it to get to the image, without success... Could someone help to point out where I am wrong please? Thank you very much in advance!!
Related
I'm trying to access the data of an api and I have a problem that I can't solve...
I have made a call to the api and it returns the results correctly:
export const getCharacters = async (category) => {
const url = `https://www.breakingbadapi.com/api/characters?name=${encodeURI(category)}`;
const resp = await fetch(url);
const data = await resp.json();
const characters = data.map(item => {
return {
id: item.char_id,
title: item.name,
url: item.img,
nickname: item.nickname,
bday: item.birthay,
occupation: item.occupation,
status: item.status
}
})
return characters;
}
I put the results into a card and then I add in the character card a link to another component where I want to show "more details":
import React from 'react'
import { Link } from 'react-router-dom'
import '../../index.css'
export const CharactersGridItem = ({id, title, url}) => {
return (
<div className="card-global">
<span className="col">
<span className="card" style={{width: '10rem'}}>
<span className="row">
<img src={url} className="card-img-top" alt={title} style={{ width: '270px', height: '250px'}}></img>
<h6 className="card-title">{title}</h6>
<Link
className="card-body"
to={`/Characters/${id}`}
>
Details...
</Link>
</span>
</span>
</span>
</div>
)
}
All this works correctly and takes me to the url of the character's id on which I click.
My problem is when I try to recover those other properties of the character that, curiously, I can see them in the console (before everything explodes).
Here is the hook with which I made that second "request" for data:
import { useState, useEffect } from "react";
export const useCharacter = (id) => {
const [character, setCharacter] = useState()
function getCharacter(id) {
return fetch(
`https://www.breakingbadapi.com/api/characters/${encodeURI(id)}`
);
}
useEffect(() => {
// Después de que el componente se monta, se ejecuta este callback
getCharacter(id).then((resp) => resp.json()).then(([body]) => {
//console.log(body)
setCharacter(body)
})
}, [])
//return character;
return character;
}
And this is where I bring the data:
import React from 'react'
import { useParams } from 'react-router-dom';
import { useCharacter } from '../../hooks/useCharacter';
export const CharactersDetail = (setCharacter) => {
const { id } = useParams()
const characters = useCharacter(id)
console.log(characters)
return (
<div className="container">
<div className="container-section">
<p>{characters.name}</p>
<p>{characters.nickname}</p>
</div>
</div>
)
}
When I click on a character, and go to the details page (CharacterDetails), if I don't put this code on the return...:
<p>{characters.name}</p>
<p>{characters.nickname}</p>
...everything works correctly and with console.log it prints the data json correctly (console). Even if I write the code and refresh the page (localhost:3000), it prints what I ask for.
But the moment I go back to the character page, click on another one (different id) and get to its corresponding detail page, everything explodes. An error tells me that it doesn't recognize the characters.name or characters.nickname.
Any ideas on why this might be happening?
Any help is greatly appreciated!!!
wcharacters will be undefined for the first render. Only after the data is received your components render again.
So you need to explicitly handle the case where useCharacter returns undefined.
For example:
export const CharactersDetail = (setCharacter) => {
const { id } = useParams();
const characters = useCharacter(id);
if (!characters) {
return <div>Loading...</div>;
}
return (
<div className="container">
<div className="container-section">
<p>{characters.name}</p>
<p>{characters.nickname}</p>
</div>
</div>
)
}
I am trying to make an image slider with React and Gatsby but the images aren't rendering and I get this in console
static-image.server.tsx:51 No data found for image "undefined"
Could not find values for the following props at build time: src
This is my code. When I change the image source to '../images/1.png' instead of images[sliderIndex] the image will show.
const ImageSlider = (props) => {
const [sliderIndex, setSliderIndex] = useState(0);
const images = ['../images/1.png', '../images/2.png']
useEffect(() => {
const sliderLoop = setInterval(() => {
if(sliderIndex+1 > images.length-1) {
setSliderIndex(0)
} else {
setSliderIndex(sliderIndex+1)
}
}, 5000)
return () => clearInterval(sliderLoop)
}, [sliderIndex])
console.log(sliderIndex)
return (
<>
{props.children}
<StaticImage src={images[sliderIndex]} alt=""/>
</>
)
}
<StaticImage /> would only works with a static string, see this part of the docs for more info.
You'd have to use the <GatsbyImage /> component instead & query image data manually, as instructed here. I copied the relevant sample code below.
import { graphql } from "gatsby"
import { GatsbyImage, getImage } from "gatsby-plugin-image"
function BlogPost({ data }) {
const image = getImage(data.blogPost.avatar)
return (
<section>
<h2>{data.blogPost.title}</h2>
<GatsbyImage image={image} alt={data.blogPost.author} />
<p>{data.blogPost.body}</p>
</section>
)
}
export const pageQuery = graphql`
query {
blogPost(id: { eq: $Id }) {
title
body
author
avatar {
childImageSharp {
gatsbyImageData(
width: 200
placeholder: BLURRED
formats: [AUTO, WEBP, AVIF]
)
}
}
}
}
`
Im trying to display all my Contentful blog posts to my index page in Gatsby but i get an error.
im creating the Posts pages on gatsby-node.js like this:
const path = require(`path`)
// Log out information after a build is done
exports.onPostBuild = ({ reporter }) => {
reporter.info(`Your Gatsby site has been built!`)
}
// Create blog pages dynamically
exports.createPages = async ({ graphql, actions }) => {
const { createPage } = actions
const blogPostTemplate = path.resolve(`src/templates/blogPost.js`)
const result = await graphql(`
query {
allContentfulPost {
edges {
node {
postTitle
slug
}
}
}
}
`)
result.data.allContentfulPost.edges.forEach(edge => {
createPage({
path: `${edge.node.slug}`,
component: blogPostTemplate,
context: {
title: edge.node.postTitle,
slug: edge.node.slug,
},
})
})
}
based on this template:
import React from "react"
import { graphql } from "gatsby"
import styled from "styled-components"
export const pageQuery = graphql`
query($slug: String!) {
post: contentfulPost(slug: { eq: $slug }) {
slug
postTitle
postContent {
childMarkdownRemark {
html
}
}
postImage {
title
fluid {
src
}
}
}
}
`
function blogPost({ data }) {
return (
<div>
<img
src={data.post.postImage.fluid.src}
alt={data.post.postImage.title}
></img>
<h1>{data.post.postTitle}</h1>
<h3
dangerouslySetInnerHTML={{
__html: data.post.postContent.childMarkdownRemark.html,
}}
/>
</div>
)
}
export default blogPost
Now i try to create a component which will hold all the blog posts so i can display it on my index.js page, like this:
import { Link, graphql, StaticQuery } from "gatsby"
import React from "react"
import styled from "styled-components"
function BlogSection() {
return (
<StaticQuery
query={graphql`
query blogQuery {
allContentfulPost {
edges {
node {
slug
postTitle
postImage {
file {
url
fileName
}
}
postContent {
postContent
}
postDate
}
}
}
}
`}
render={data => (
<ul>
<Link to={data.allContentfulPost.edges.node.slug}> //here's where the error happens
{data.allContentfulPost.edges.node.postTitle}
</Link>
</ul>
)}
/>
)
}
export default BlogSection
But i get an error Cannot read property 'slug' of undefined which is driving me crazy for days.
any help would be appreciated!
Use:
<ul>
{data.allContentfulPost.edges.map(({ node }) => {
return <Link to={node.slug} key={node.slug}>
{node.postTitle}
</Link>
})}
</ul>
You are querying all pots from Contentful (allContentfulPost) which following the nested structure, has an edges and a node inside: this last one has all the information of your posts (because of the nested structure, you have the slug, the postTitle, etc) so the node, is indeed your post. That said, you only need to loop through edges, which is an array of your posts. In the previous snippet:
data.allContentfulPost.edges.map(({ node })
You are destructuring the iterable variable at the same time you loop through it ({ node }). You can alias it for a more succint approach like:
<ul>
{data.allContentfulPost.edges.map(({ node: post }) => {
return <Link to={post.slug} key={post.slug}>
{post.postTitle}
</Link>
})}
</ul>
It's important to use the key attribute in all loops since it will help React to know what elements are changing.
I'm working on my first integration of Sanity with Next.Js, trying to add a blog to a personal site. Dev works fine, but when I go to deploy, or do a build, I get an error that it can't find one of the props for the blog page.
Error thrown is this:
TypeError: Cannot read property 'title' of undefined
This is what I'm using for my [slug].js file:
import { useState, useEffect } from 'react';
import { motion } from 'framer-motion';
import Head from 'next/head';
import { useRouter } from 'next/router';
import Layout from '../../components/layout';
import Scrollbar from 'react-scrollbars-custom';
import Transitions from '../../lib/transitions';
import BlockContent from '#sanity/block-content-to-react';
import { postQuery, postSlugsQuery } from '../../lib/grocQueries';
import { getClient, overlayDrafts, sanityClient } from '../../lib/sanity.server';
import { urlForImage, usePreviewSubscription } from '../../lib/sanity';
const pageVariants = Transitions.pageVariant;
const pageTransition = Transitions.pageTransition;
export const Post = ({ data = {}, preview }) => {
const router = useRouter();
const slug = data?.post?.slug;
const {
data: { post, morePosts },
} = usePreviewSubscription(postQuery, {
params: { slug },
initialData: data,
enabled: preview && slug,
});
return (
<Layout>
<motion.article className='blog-article' initial='initial' animate='in' exit='out' variants={pageVariants} transition={pageTransition}>
<Scrollbar style={{ width: '100%', height: '100%' }}>
<figure className='hero-container'>
<h1 className='blog-title'>{post.title} </h1>
{post.mainImage && <img className='blog-hero' alt='Some alt Text' src={urlForImage(post.mainImage).url()} />}
</figure>
<div className='copy-block'>
<BlockContent blocks={post.body} imageOptions={{ w: 860, fit: 'max' }} {...sanityClient.config()} />
</div>
</Scrollbar>
</motion.article>
</Layout>
);
};
export async function getStaticProps({ params, preview = false }) {
const { post, morePosts } = await getClient(preview).fetch(postQuery, {
slug: params.slug,
});
return {
props: {
preview,
data: {
post,
morePosts: overlayDrafts(morePosts),
},
},
};
}
export async function getStaticPaths() {
const paths = await sanityClient.fetch(postSlugsQuery);
return {
paths: paths.map((slug) => ({ params: { slug } })),
fallback: true,
};
}
export default Post;
<figure className='hero-container'>
<h1 className='blog-title'>{post?.title} </h1>
{post?.mainImage && <img className='blog-hero' alt='Some alt Text' src={urlForImage(post?.mainImage).url()} />}
</figure>
During the build time next not aware of the post object and its key so it's better to make an optional chaining.
There are 2 things may want to add a in static generated page so it knows what to do if there isn't any props.
Add props checking in page, so it will not fail build.
if (!props) return null // or !data in your case.
Add notFound return props in getStaticProps so it knows how to handle 404 properly.
return {
notFound: true,
revalidate: 300,
}
I am unable to pull in the data of my Ghost blog using Gatsby. I am using Ghost as my back end and I am using a package to get the Ghost blog as a source. The problem is just getting the individual posts on the page. Here is blog-post.js:
import React from "react";
export default ({ data }) => {
// const post = data.allGhostPost.edges;
return (
<div>
{/* <h1>{post.title}</h1> */}
{/* <div dangerouslySetInnerHTML={{ __html: post.html }} /> */}
</div>
);
};
export const query = graphql`
query BlogPostQuery($slug: String!) {
allGhostPost {
edges {
node {
id
slug
title
html
published_at
}
}
}
}
`;
Here is my gatsby node file:
exports.createPages = ({ graphql, boundActionCreators}) => {
const {createPage} = boundActionCreators
return new Promise((resolve, reject) => {
const blogPostTemplate = path.resolve(`src/templates/blog-post.js`)
resolve(
graphql(
`
{
allGhostPost(sort: { order: DESC, fields: [published_at] }) {
edges {
node {
id
slug
title
html
published_at
}
}
}
}
`
)
.then(result => {
result.data.allGhostPost.edges.forEach(edge => {
createPage({
path: edge.node.slug,
component: blogPostTemplate,
context: {
slug: edge.node.slug
}
})
})
return;
})
)
})
}
I figured out my problem and it was a problem with my Queries. For anyone working with the Ghost API. This is the answer you will need:
query BlogPostQuery($slug: String!) {
allGhostPost(filter: {slug: {eq: $slug}}) {
edges {
node {
id
slug
title
html
published_at
}
}
}
}
Let me explain my answer.
The issue was that my GraphQL query was not working because the $slug field was not being used within the query. It was just being passed in. That being said, I had to learn a bit of GraphQL to get to my final conclusion.
Using the GraphiQL I was able to find that the allGhostPost had a filter method. Using that I was able to pull in the right result.