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Hooks to populate the html head.
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0no-co/hoofd
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This project aims at providing a set of hooks to populate<meta>, ... for each page. With crawlers now supportingclient-side alterations it's important to support a fallback model for our<head> tags. The dispatcher located in thislibrary will always make a queue of how we should fallback, ... This way we'll always have some information to give to avisiting crawler.
npm i --save hoofd## ORyarn add hoofdimport{useMeta,useLink,useLang,useTitle,useTitleTemplate}from'hoofd';constApp=()=>{// Will set <html lang="en">useLang('en');// Will set title to "Welcome to hoofd | 💭"useTitleTemplate('%s | 💭');useTitle('Welcome to hoofd');useMeta({name:'author',content:'Jovi De Croock'});useLink({rel:'me',href:'https://jovidecroock.com'});return<p>hoofd</p>;};
Or you can choose to
import{useHead,useLink}from'hoofd';constApp=()=>{useHead({title:'Welcome to hoofd | 💭',language:'en',metas:[{name:'author',content:'Jovi De Croock'}],});useLink({rel:'me',href:'https://jovidecroock.com'});return<p>hoofd</p>;};
If you need support forPreact you can import fromhoofd/preact instead.
There's a plugin that hooks in withGatsby and thatwill fill in themeta, ... in your build process.
This package exportsuseTitle,useTitleTemplate,useMeta,useLink anduseLang. These hooksare used to control information conveyed by the<head> in an html document.
This hook accepts a string that will be used to set thedocument.title, every time thegiven string changes it will update the property.
This hook accepts a string, which will be used to format the result ofuseTitle wheneverit updates. Similar to react-helmet, the placeholder%s will be replaced with thetitle.
This hook accepts the regular<meta> properties, beingname,property,httpEquiv,charset andcontent.
These have to be passed as an object and will update whencontent changes.
This hook accepts the regular<link> properties, beingrel,as,media,href,sizes andcrossorigin.
This will update within the sameuseLink but will never go outside
This hook accepts a string that will be used to set thelang property on thebase<html> tag. Every time this string gets updated this will be reflected in the dom.
This hook accepts a few arguments and will lead to an injection of a script tag into the dispatcher (during ssr)or the DOM (during csr).
- src?: this can be a location where the script lives, for example
public/x.jsor an inline script for exampledata:application/javascript,alert("yolo"). - id?: a unique identifier used for querying the script tag. Atleast one among
srcandidprop is mandatory. - text?: this sets the inner
texton the script tag. Can be used for addingembedded data,rich text data. - type?: this sets the
typeattribute on the script tag. - async?: this sets the
asyncattribute on the script tag. - defer?: this sets the
deferattribute on the script tag. - module?: this property will override the
typeatrribute on the script tag with a value ofmodule. - crossorigin?: 'anonymous' | 'use-credentials';
- integrity?: string;
We expose a method calledtoStatic that will return the following properties:
- title, the current
titledictated by the deepestuseTitleTemplateanduseTitlecombination - lang, the current
langdictated by the deepestuseLang - metas, an array of unique metas by
keyword(property, ...) - links, the links aggregated from the render pass.
The reason we pass these as properties is to better supportgatsby, ...
If you need to stringify these you can use the following algo:
conststringify=(title,metas,links)=>{conststringifyTag=(tagName,tags)=>tags.reduce((acc,tag)=>`${acc}<${tagName}${Object.keys(tag).reduce((properties,key)=>`${properties}${key}="${tag[key]}"`,'')}>`,'');return` <title>${title}</title>${stringifyTag('meta',metas)}${stringifyTag('link',links)} `;};
import{toStatic}from'hoofd';constreactStuff=renderToString();const{ metas, links, title, lang}=toStatic();conststringified=stringify(title,metas,links);consthtml=` <!doctype html> <html${lang ?`lang="${lang}"` :''}> <head>${stringified} </head> <body> <div>${reactStuff} </div> </body> </html>`;
By default this package relies on a statically-initialized context provider to accumulate anddispatch<head> and<meta> changes. In cases where you may want to control the Dispatcherinstance used, this module exports aHoofdProvider context provider andcreateDispatcherfunction for creating valid context instances.
import{createDispatcher,HoofdProvider}from'hoofd';functionssr(App){constdispatcher=createDispatcher();constwrappedApp=(<HoofdProvidervalue={dispatcher}><App/></HoofdProvider>);constmarkup=renderToString(wrappedApp);const{ metas, links, title, lang}=dispatcher.toStatic();// See example above for potential method to consume these static results.}
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