In Part 1 we put together a simple avatar component that can receive an image URL and render it out as around image.
To get the full benefit of Gatsby Image we need to make sure our image is pulled into our graphql. We'll need to install a couple of plugins to help us here. gatsby-image, gatsby-transformer-sharp, gatsby-plugin-sharp will be needed.
Let's install gatsby-image
npm install --save gatsby-image
Then, if you don't already have gatsby-transformer-sharp and gatsby-plugin-sharp we can install them.
npm install --save gatsby-transformer-sharp gatsby-plugin-sharp
Then in your gatsby-config.js:
plugins: [`gatsby-transformer-sharp`, `gatsby-plugin-sharp`]
We'll need a source plugin set up as well. For this example, we're going to use gatsby-source-filesystem. Here is what our gatsby-config might look like, assuming our images are in src/assets.
const path = require(`path`)
module.exports = {
plugins: [
{
resolve: `gatsby-source-filesystem`,
options: {
name: `assets`,
path: path.join(__dirname, `src`, `assets`),
},
},
`gatsby-plugin-sharp`,
`gatsby-transformer-sharp`,
],
}
Now let's drop our image file into our assets folder and create a query for it. We can use the hook for StaticQuery in our component which will make the image available through the data prop. Since we know the size of the image we can add those dimensions in our graphql query so the browser doesn't have to do all the work.
const data = useStaticQuery(graphql`
query {
placeholderImage: file(relativePath: { eq: "monster-01-headshot.png" }) {
childImageSharp {
fixed(width: 75, height: 75) {
...GatsbyImageSharpFixed
}
}
}
}
`)
Then we need to add the Img component from gatsby-image so that it can do its magic.
import Img from "gatsby-image"
function Avatar(props) {
{...}
return (
<Img
style={styles}
fixed={data.placeholderImage.childImageSharp.fixed}
alt={altText}
title={title} />
)
}
Now let's put it all together.
import React from "react"
import { useStaticQuery, graphql } from "gatsby"
import Img from "gatsby-image"
function Avatar(props) {
const data = useStaticQuery(graphql`
query {
placeholderImage: file(relativePath: { eq: "monster-01-headshot.png" }) {
childImageSharp {
fixed(width: 75, height: 75) {
...GatsbyImageSharpFixed
}
}
}
}
`)
const {url, altText, title} = props;
const styles = {
width: '75px',
height: '75px',
borderRadius: '50%'
}
return (
<Img
style={styles}
fixed={data.placeholderImage.childImageSharp.fixed}
alt={altText}
title={title} />
)
}
export default Avatar
We're still missing the ability to pass a URL to our avatar component so let's add that back in. We can return a regular img element if we get a URL. Using fixed will be better since we're not worried about fluid mode with this component.
import React from "react"
import { useStaticQuery, graphql } from "gatsby"
import Img from "gatsby-image"
function Avatar(props) {
const data = useStaticQuery(graphql`
query {
placeholderImage: file(relativePath: { eq: "monster-01-headshot.png" }) {
childImageSharp {
fixed(width: 75, height: 75) {
...GatsbyImageSharpFixed
}
}
}
}
`)
const {url, altText, title} = props;
const styles = {
width: '75px',
height: '75px',
borderRadius: '50%'
}
if (url) {
return (
<img
style={styles}
src={url}
alt={altText}
title={title} />
);
}
return (
<Img
style={styles}
fixed={data.placeholderImage.childImageSharp.fixed}
alt={altText}
title={title} />
)
}
export default Avatar
This allows us to call avatar without us needing to pass a prop of the image URL. If you need multiple avatar images for your team you can add them to the quite and pass a user prop down and we'll grab that from the query. We can name the queries to match the users like so:
function Avatar(props) {
const data = useStaticQuery(graphql`
query {
monster1: file(relativePath: { eq: "monster-01-headshot.png" }) {
childImageSharp {
fixed(width: 75, height: 75) {
...GatsbyImageSharpFixed
}
}
}
monster2: file(relativePath: { eq: "monster-02-headshot.png" }) {
childImageSharp {
fixed(width: 75, height: 75) {
...GatsbyImageSharpFixed
}
}
}
}
`)
const {url, altText, title, user} = props;
const image = data[user].childImageSharp.fixed;
{...}
That way we can pass monster1 or monster2 in our user prop to have it render that monster.
<Avatar
alText='Monster P. Whittington portrait'
title='Monster P. Whittington'
user='monster1' />
<Avatar
alText='Mons T. Cobblepot portrait'
title='Mons T. Cobblepot'
user='monster2' />
Nice, now we can type it so it's easier to know what name can be used and to see if our structure is correct if we ever need to edit it.
Top comments (1)
Thanks for the tutorial!
While part 1&2 were clear and straightforward, I fail to understand what the 3rd part is about and when/why is needed.
Would you, please, take a minute to explain me this part (like I'm five)?
I don't event get why Graphql is necessary here...
I'll soon follow through with my implementation of your tutorial.
P. S. I'm (very) new to react and gatsby.