Next.JS implement external ".js" with <script> - javascript

Im Building a website with Next.Js and I tried to implement an external .js file (Bootstrap.min.js & Popper.min.js) but it is not displayed.
Im not sure what the problem is!
I implemented it like this:
import Head from 'next/head';
//partials
import Nav from './nav'
const Layout = (props) => (
<div>
<Head>
<title>Site</title>
{/* Meta tags */}
<meta charset="utf-8"></meta>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"></meta>
{/* Standard page css */}
<link rel="stylesheet" type="text/css" href="/static/css/page.css"/>
{/* Bootstrap CSS */}
<link rel="stylesheet" href="/static/includes/bootstrap.min.css"/>
{/* jQuery first, then Popper.js, then Bootstrap JS */}
<script src="/static/includes/popper.min.js"></script>
<script type="text/javascript" src="/static/includes/bootstrap.min.js"></script>
</Head>
<Nav/>
{props.children}
</div>
);
export default Layout;
It looks good to me? what am I missing, it's not projecting as it should!
When I tried a script inside the page it shows "Hello JavaScript" for a very short time and then it disappears?
<p id="demo"></p>
<script>document.getElementById("demo").innerHTML = "Hello JavaScript";</script>
How do i fix it?
Please help!
Im Using:
"next": "^8.0.3",
"react": "^16.8.4",
"react-dom": "^16.8.4"

You need to put all your scripts inside the Head tag.
Don't put raw javascript inside the Head tag. Put it in a separate file and import the script in the Head tag
You can create a .js file, which contains your raw js code, in the public folder and then use the script in the Head tag. I am not sure why we have to do this, but this is how it works in Next.js
So for your problem, this will work:
public/js/myscript.js
document.getElementById("demo").innerHTML = "Hello JavaScript";
Layout.js
import Head from 'next/head';
const Layout = (props) => (
<div>
<Head>
{/* import external javascript */}
<script type="text/javascript" src="..."></script>
<script type="text/javascript" src="/js/myscript.js"></script>
</Head>
<p id="demo"></p>
</div>
);
export default Layout;

You can use Script tag from next/script for importing external .js files.
The following is an example snippet from one of my projects. I had to import the script at the end of the page due to some DOM manipulations so the Script tag worked exceptionally well :)
import Script from "next/script";
import Content from "../components/Content";
import Header from "../components/Header";
const index = () => {
return (
<div>
<Header />
<Content />
<Script type="text/javascript" src="./assets/js/main.js" />
</div>
);
};
export default index;

This is working as Expected for me.
<script
dangerouslySetInnerHTML={{
__html: `
console.log('Console message');
`,
}}
/>

#GunnerFan was in the right path. NextJS recommends putting these files in the public folder
So
import Head from "next/head";
// ... elsewhere in your code
<HEAD>
<script type="text/javascript" src="js/myscript.js"></script>
</HEAD>
You can refer to files in the folder directly, e.g: js/<your file>
Be careful not to name them same as files in the pages directory, i.e
INCORRECT: pages/myscript.js & js/myscript.js
Ref: https://nextjs.org/docs/basic-features/static-file-serving

Related

How to get another component on ReactJs use ES6 modules

i need help for integrate frontend ReactJS on my site. currently i avoid to use nodeJS or NPM for implement my reactJS. but i'm using ReactJS CDN. so i not run npm start when develop the reactJS. i just want to use the frontend.
Hope this will understand from the start. so i have a question, how do i able to get another component and place it on single file.
I Created file App.js. I plan that this file will become a centralize for other components.
let me share what i'm doing right now.
here is my file structure
this is my code on index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Buynow Project</title>
<script src="https://unpkg.com/react#16/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom#16/umd/react-dom.development.js" crossorigin></script>
<script src="https://unpkg.com/babel-standalone#6/babel.min.js"></script>
<script type="text/babel" src="buynow/index.js"></script>
</head>
<body>
<div id="root"></div>
</body>
</html>
this is my code on index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js'
ReactDOM.render(<App />, document.getElementById('root'));
this is my code on App.js
import React from 'react';
import Navbar from './components/Navbar.js'
function App(props){
return (
<div>
<Navbar/>
Hello App
</div>
);
}
export default App;
this is my code on Navbar.js
import React from 'react';
function NavBar(props) {
return (
<div>
<Navbar/>
Hi NavBar
</div>
);
}
export default NavBar;
but i got this error, and pointed on file index.js line:1
Uncaught ReferenceError: require is not defined
this is error
I confuse how to solve this. I start with the simple code just for testing if it can work or not.
please help.
https://reactjs.org/docs/react-without-jsx.html
JSX is not a requirement for using React. Using React without JSX is
especially convenient when you don’t want to set up compilation in
your build environment.
So you can't use JSX/TSX directly in your browser (need compilation). Also, you can't use import outside a module (so basically now, you can already use your function components by adding the import of all your files in the index.html).
In my experience I suggest that you use the benefits of JSX / TSX and compile your code with NPM to be more comfortable (everything is way more intuitive with jsx).
In any case, in the link that I have included, you will find how to do the equivalent of JSX with pure javascript. That's what you need. (as you can see in my small snippet)
If you want keep using react from CDN and without compiling, your code, should be something like this:
// For the Snippet i have all of your js here
// But you could just import in your index.html every separate component file you have (without any import/export syntax)
function NavBar(props) {
return React.createElement('span', null,props.title);
}
function App(props){
return React.createElement('span', null, React.createElement(NavBar, {title: 'Header'}, null),
React.createElement('span', null,'Hello App'));
}
ReactDOM.render(React.createElement(App, {}, null), document.getElementById('root'));
<html>
<head>
<meta charset="UTF-8" />
<title>Buynow Project</title>
<script src="https://unpkg.com/react#16/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom#16/umd/react-dom.development.js" crossorigin></script>
<script src="https://unpkg.com/babel-standalone#6/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
</body>
</html>
Anyway, as you see, the code is not so readable this way...
EDIT
I made the same snippet on stackblitz with separated files
https://stackblitz.com/edit/web-platform-4ruju9?file=index.html
Ps. Also, don't put NavBar inside NavBar or you'll get a render loop
You have to enable module support in script tag
<script type="text/babel" data-type="module" src="./index.js"></script>
Remove React import statements as they can be directly used.

How to use jQuery & Slick in Next.js App?

I want to implement this into my Next.js App
https://codepen.io/Lemonzillah/pen/rmQLRm
I tried to add both libraries needed for this to work in the _document.js file and then link the js code in text-slider from /public
<Main />
<NextScript />
<script src="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.5.9/slick.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script src="public/text-Slider.js"></script>
But it ain't working, somehow - it doesn't show any error. It's just now working - hope you can help me!
First of all. It is recommended to not use jquery in react or next js app.
Then if you want to use jquery in next js app you can use next docuemnt..
import Document, { Html, Head, Main, NextScript } from 'next/document'
class MyDocument extends Document {
static async getInitialProps(ctx) {
const initialProps = await Document.getInitialProps(ctx)
return { ...initialProps }
}
render() {
return (
<Html>
<Head>
**Here you can use custom css link or font link like bootstrap cdn
</Head>
<body>
<Main />
<NextScript />
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.5.9/slick.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script src="public/text-Slider.js"></script>
</Html>
)
}
}
export default MyDocument
You can use now slick by calling slick slider cdns link in script and css. Ans use them. It is recommend to use React slick in next js app

How do I use Next JS's Head tag

I've only just started looking at Next JS for my project but am having issues with the Head tag not working. According to the documentation, I should just be able to import head from next/head and insert the title tag. However, it's not working for me, be it using the Layout component which gets imported to each page or directly injecting it.
Here is the code as a layout (/components/layout.jsx)
import Link from 'next/link';
import Head from 'next/head';
export default function Layout({
children,
title = 'Default Title'
}) {
return(
<div>
<Head>
<title>{title}</title>
<meta charSet='utf-8' />
<meta name="viewport" content="initial-scale=1.0, width=device-width" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css"></link>
</Head>
<nav>
<div className='nav-wrapper'>
<ul class='right hide-on-med-and-down'>
<li>
<Link href='/'>
<a>Home</a>
</Link>
</li>
<li>
<Link href='/about'>
<a>About</a>
</Link>
</li>
</ul>
</div>
</nav>
{children}
{/* Footer to go in here */}
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
</div>
)
}
And this is the about page (/pages/about.jsx)
import React from 'react';
import Layout from '../components/layouts';
function About() {
return(
<Layout>
<div>
<h1>Test Page</h1>
</div>
</Layout>
);
}
export default About;
It just doesn't work at all. The title is not updated and if I inspect the components, I can't see anything that I've added. I originally thought that it's because I set up the Next app myself and I did something wrong. However, I tried bootstrapping it with npx create-next-app and I am seeing the same issue.
Any help is appreciated!
Cheers
First, create a new component, eg. seo.jsx
import Head from "next/head";
const SEO = ({ pageTitle, pageDescription }) => (
<Head>
<title>{pageTitle}</title>
<meta name="description" content={pageDescription} />
...
</Head>
);
export default SEO;
Second, import to your page (eg. home.jsx):
import SEO from "#components/seo"; //change to your path
const Home = () => {
...
return (
<div>
<SEO pageTitle="Homepage" pageDescription="Welcome to my website" />
...
</div>
);
};
export default Home;
In this scenario you will be able to change title and description (or any other props you need) in any page of your app, without worrying about meta key duplicates.
More info here.
I took your exact code and created a sandbox and I can see the title working as expected provided you use .jsx in your import
import Layout from '../components/layouts';
to
import Layout from '../components/layouts.jsx';
or if you want to use without extension, use .js instead
**Code Sandbox - ** https://codesandbox.io/s/vigorous-wind-4e035?file=/pages/index.js
Next JS Discussion - https://github.com/vercel/next.js/issues/2391#issuecomment-311735189
I didn't do anything specific to the title but to make the sandbox work and to print the document title.
I modified paths without the folder and the default IndexPage next sandbox
Modified Index to print the document title
Instead of importing components/layout, imported components/layout.jsx
The Codesandbox crashed when i tried to import the file without the JSX extension.
Let me know if this helps or we can explore further!
I also got that the head tag is not a working issue, what I did was added a tag for cover and the layout of the body
ex:
<main>
<head>
{..head elements }
</head>
<div>
{ other elements }
<div>
</main>

How to include local javascript on a Gatsby page?

I'm a total React newbie and I guess there is something fundamental I don't quite understand here. A default Gatsby page looks like this. Is there a way to use a local .js file somewhat like this?
<script src="../script/script.js"></script>
What I would like to achieve is to have react ignore script.js but still have the client side use it. A default Gatsby page looks like this, is it possible to do somerthing like that there?
import React from "react"
import { Link } from "gatsby"
import Layout from "../components/layout"
import Image from "../components/image"
import SEO from "../components/seo"
const IndexPage = () => (
<Layout>
<SEO title="Home" keywords={[`gatsby`, `application`, `react`]} />
<h1>Hi people</h1>
<p>Welcome to your new Gatsby site.</p>
<p>Now go build something great.</p>
<div style={{ maxWidth: `300px`, marginBottom: `1.45rem` }}>
<Image />
</div>
<Link to="/page-2/">Go to page 2</Link>
</Layout>
)
After several hours of frustration I finally stumbled upon discussion on GitHub that solved this for me. In Gatsby, there is a thing called static folder, for which one use case is including a small script outside of the bundled code.
Anyone else in the same situation, try proceeding as follows:
Create a folder static to the root of your project.
Put your script script.js in the folder static.
Include the script in your react dom with react-helmet.
So in the case of the code I posted in my original question, for instance:
import React from "react"
import Helmet from "react-helmet"
import { withPrefix, Link } from "gatsby"
import Layout from "../components/layout"
import Image from "../components/image"
import SEO from "../components/seo"
const IndexPage = () => (
<Layout>
<Helmet>
<script src={withPrefix('script.js')} type="text/javascript" />
</Helmet>
<SEO title="Home" keywords={[`gatsby`, `application`, `react`]} />
<h1>Hi people</h1>
<p>Welcome to your new Gatsby site.</p>
<p>Now go build something great.</p>
<div style={{ maxWidth: `300px`, marginBottom: `1.45rem` }}>
<Image />
</div>
<Link to="/page-2/">Go to page 2</Link>
</Layout>
)
Notice the imports
import Helmet from "react-helmet"
import { withPrefix, Link } from "gatsby"
and the script element.
<Helmet>
<script src={withPrefix('script.js')} type="text/javascript" />
</Helmet>
This would have saved hours of my time, hopefully this does it for someone else.
There are many ways to add scripts in GatsbyJS...
To execute a script on a specific page
create a stateless ScriptComponent.js file and place it inside your /src folder.
in your ScriptComponent.js use require() to execute the script inside useEffect() like this:
const ScriptComponent = ({
src, // if internal,put a path relative to this component
onScriptLoad = () => {}, // cb
appendToHead = false,
timeoutDuration = 10,
defer = false,
isExternal = false,
}) => {
useEffect(() => {
setTimeout(() => {
if (isExternal) {
const script = document.createElement('script');
script.src = src;
script.onload = onScriptLoad;
defer
? script.defer = true
: script.async = true;
appendToHead
? document.head.appendChild(script)
: document.body.appendChild(script);
} else { // for internal scripts
// This runs the script
const myScript = require(src);
}
}, timeoutDuration);
}, []);
return null;
};
To run it on client-side, you could check the window object inside your script.js file if you didn't run it in useEffect:
if(typeof window !== 'undefined' && window.document) {
// Your script here...
}
finally, go to the page you want to execute the script in it (e.g. /pages/myPage.js ), and add the component <ScriptComponent />
If you want to execute a script globally in (every component/page) you could use the html.js file.
first, you'll have to extract the file (in case you didn't) by running:
cp .cache/default-html.js src/html.js
inside your html.js file:
<script dangerouslySetInnerHTML= {{ __html:`
// your script here...
// or you could also reuse the same approach as in useEffect above
`}} />
Just create gatsby-ssr.js file on root folder
and add the following pattern for your scripts folder
import React from 'react'
export const onRenderBody = ({ setPostBodyComponents }) => {
setPostBodyComponents([
<script
key="https://code.jquery.com/jquery-3.2.1.slim.min.js"
src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossOrigin="anonymous"
defer
/>,
<script
key="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossOrigin="anonymous"
defer
/>,
<script
key="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossOrigin="anonymous"
defer
/>
])
}
Then, you at the end of dom you'll see the links to scripts
If you'd like to use a Gatsby plugin, which to me is no different from using an external library like Helmet (plugins are npm packages after all), you could use gatsby-plugin-load-script.
You can provide either the url to the src attribute or a local path. If you're going to store your JS in a local file such as some-minified-js.min.js - make sure to store in the static directory at the root of your project.
Once you do this, you can access via the global object:
global.<object or func name here>
For example, I was trying to include a very small JS library via a minified file, so I stored the file in /static/my-minified-library.min.js and then:
Installed the plugin: npm i --save gatsby-plugin-load-script
Added this to my gatsby-config.js
plugins: [
{
resolve: "gatsby-plugin-load-script",
options: {
src: "/my-minified-library.min.js",
},
},
],
Accessed in my react component like so:
useEffect(() => {
const x = new global.MyImportedLibraryObject();
}, []}
Gatsby uses html.js in the src folder. Not index.html like most react projects.
Example html.js file:
import React from "react"
import PropTypes from "prop-types"
export default class HTML extends React.Component {
render() {
return (
<html {...this.props.htmlAttributes}>
<head>
<meta charSet="utf-8" />
<meta httpEquiv="x-ua-compatible" content="ie=edge" />
<meta
name="viewport"
content="width=device-width, initial-scale=1, shrink-to-fit=no"
/>
{this.props.headComponents}
</head>
<body {...this.props.bodyAttributes}>
{this.props.preBodyComponents}
<div
key={`body`}
id="___gatsby"
dangerouslySetInnerHTML={{ __html: this.props.body }}
/>
{this.props.postBodyComponents}
</body>
</html>
)
}
}
HTML.propTypes = {
htmlAttributes: PropTypes.object,
headComponents: PropTypes.array,
bodyAttributes: PropTypes.object,
preBodyComponents: PropTypes.array,
body: PropTypes.string,
postBodyComponents: PropTypes.array,
}
For adding custom Javascript using dangerouslySetInnerHTML inside src/html.js:
<script
dangerouslySetInnerHTML={{
__html: `
var name = 'world';
console.log('Hello ' + name);
`,
}}
/>
You can try adding your js there but, note that your js may not work as expected. You can always look into react-helmet for more dynamic apps and adding scripts to <head>.
Gatsby Documentation: https://www.gatsbyjs.org/docs/custom-html/
You can do this very easily with the Gatsby plugin "gatsby-plugin-load-script."
Simply do this:
Create a folder named static at the root of your gatsby app
Place your script in it
Add the following configuration in gatsby-config.js
{
resolve: 'gatsby-plugin-load-script',
options: {
src: '/test-script.js', // Change to the script filename
},
},
I'm not sure if anyone still needs this answer, but here it goes:
The answer by Elliot Marques is excellent. If you need it for a local file, upload the script to Github and use a service like JSDelivr. It saves a lot of time and stress.
React works with dynamic DOM. But for rendering it by browser, your web server should send a static index page, where React will be included as another script tag.
So, take a look on your index.html page, which you can find in public folder. There you could insert your script tag in the header section, for example.

How to add a dynamic class to body tag in Gatsby.js?

Obviously, that's not an easy task, as the only thing that changes in the html.js template file by default are the head meta tags and the content.
The meta tags are handled by the Helmet component ({head.title.toComponent()} and {head.meta.toComponent()}) and the HTML changes inside the template are managed by React. (<div id="react-mount" dangerouslySetInnerHTML={{ __html: this.props.body }} />)
The body tag however is outside the scope of React, which is why I can't figure out how to change it on-the-fly when I navigate from page to page. That's exactly what I'd need though as I wanna apply a different body background to each page.
I know that I could solve this by using the exports.onRouteUpdate in gatsby-browser.js, but I would like the class to be present even if JS is disabled in the browser. Means I'd like it to be there even if I export without the bundle.js file, just generating the static site HTML.
React-helmet now supports adding attributes to body element as well.
So, if you want to add a class to a specific component/page, you can do something like this:
import Helmet from 'react-helmet'
// Inside your component
<Helmet
bodyAttributes={{
class: 'new-class-for-body'
}}
/>
// or
<Helmet>
<body className="new-class-for-body" />
</Helmet>
It does look like react-helmet supports dynamically/statically setting a class on the <html> element.
They don't want to support setting classes on the body though... https://github.com/nfl/react-helmet/issues/182
If you really need to support body classes, then this module does something very similar to react-helmet but for body classes https://github.com/iest/react-body-classname
February 2023:
Since the release of gatsby#5.5.0, the preferred way of doing this is using the Gatsby Head API. (The gatsby-plugin-react-helmet plugin has been deprecated.)
In your page file, export a <Head> component with a <body className /> element inside:
export const Head = () => <body className="your-class-name" />
You can also do this alongside other <Head> changes, e.g.:
export const Head = () => (
<>
<html lang="en" />
<title>Hello World</title>
<meta name="description" content="Hello World" />
<body className="home-page" />
</>
)

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