React without npm

React without npm - reactjs

How to import js file with code on Babel if i'm not using npm? I'm write my own server on Golang and serving html and js files.
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>TODO APP</title>
</head>
<body>
<div id="root"></div>
<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="./js/App.js"></script>
<script type='text/babel' src="./js/Info.js"></script>
</body>
</html>
App.js
class App extends React.Component {
render(){
return(
<div>
<span onClick={() => {alert('clicked')}}>{Date.now().toString()}</span>
<Info />
</div>
)
}
}
ReactDOM.render(<App />, document.getElementById('root'))
Info.js
export default class Info extends React.Component {
constructor(props) {
super(props);
this.state = {
isOpen: true,
};
this.handleClick = this.handleClick.bind(this);
}
render() {
const text = <label htmlFor="new-text">{this.state.isOpen ? 'Open' : "Closed"}</label>
return (
<div>
<button onClick={this.handleClick}>
{text}
</button>
</div>
)
}
handleClick(e) {
this.setState({
isOpen: !this.state.isOpen,
})
}
}
So i didn't know how to add Info to App. import didn't work cause i'm not using npm.

Import and export won't work. You need to add the script tags in proper order so that the dependencies are resolved.
index.html
<html>
<body>
<div id="app"></div>
<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>
<!-- Order is important -->
<script src="/info.js" type="text/babel"></script>
<script src="/index.js" type="text/babel"></script>
</body>
</html>
info.js
class Info extends React.Component {
render(){
return(
<div>
Hello World Info
</div>
)
}
}
index.js
class App extends React.Component {
render(){
return(
<div>
Hello World
<Info/>
</div>
)
}
}
ReactDOM.render(<App />, document.getElementById('app'))

Related

React doesn't render but no errors in console

Trying to render a hello world but nothing is displayed on the page. There are no messages displayed in the console. What am I missing here? Thank you.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hello World</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.1/react.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.1/react-dom.js"></script>
<scriptt src="https://unpkg.com/#babel/standalone/babel.min.js."></script>
</head>
<body>
<div id="app"></div>
<!-- Signal to babel that we would like it to handle the execution of the JS inside this script tag -->
<script type="text/babel">
class App extends React.Component {
render() {
return <h1>Hello from our app</h1>
}
}
var mount = document.querySelector('#app');
ReactDom.render(<App />, mount);
</script>
</body>
</html>

Your issue is that it is ReactDOM not ReactDom
class App extends React.Component {
render() {
return <h1>Hello from our app</h1>
}
}
var mount = document.querySelector('#app');
ReactDOM.render(<App />, mount);
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<div id="app"></div>

Passing a JSON as prop in component React JS

I have a component with another child component and I am passing a JSON state variable of the parent component as prop to the child component, but when I modify the JSON in the child component the state variable of the parent is been modified too. It doesn't have sense beacuse it just happens with JSON props, but if i use strings, numbers or arrays it works good and child state variables are just modified.
These are my components:
class Child extends React.Component{
constructor(props){
super(props)
this.state={
test2: this.props.data,
}
this.changeTextField = this.changeTextField.bind(this)
}
changeTextField(e){
let data = this.state.test2
data['name'] = e.target.value
this.setState({test2: data})
}
render(){
return(
<div>
<input type="text" value={this.state.test2['name']} onChange={this.changeTextField}/>
</div>
)
}
}
class Parent extends React.Component{
constructor(props){
super(props)
this.state={
test: {name: "hola"},
editing: false,
}
this.edit = this.edit.bind(this)
this.cancel = this.cancel.bind(this)
}
edit(){
this.setState({editing: true})
}
cancel(){
this.setState({editing: false})
}
render(){
return(
<div>
{(this.state.editing) ?
<React.Fragment>
<Child data={this.state.test}/>
<button onClick={this.cancel}>cancelar</button>
</React.Fragment>
:
<React.Fragment>
<h1>{this.state.test['name']}</h1>
<button onClick={this.edit}>edit</button>
</React.Fragment>
}
</div>
)
}
}
$(document).ready(function(){
ReactDOM.render(<Parent/>, document.getElementById("app"))
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<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="app"></div>
<script src="parent.jsx" type="text/babel"></script>
</body>
</html>

This is how JavaScript works with Objects. They are always passed by reference and the others (strings, booleans, numbers as you mentioned) are primitives meaning they are immutable.
There are many amazing answers on SO already regarding these:
JavaScript by reference vs. by value
Is JavaScript a pass-by-reference or pass-by-value language?
How do we get around this?
In your snippet, where you say data['name'] = e.target.value you are still mutating the state object, which is surely a Not To Do in React. You can read upon Power of not mutating content in React Docs.
You could create a copy of the test2 and choose to mutate that instead:
const data = {...this.state.test2};
data['name'] = e.target.value
But there is a chance that this function gets called programatically, this will run into an error because setState is async. Instead it gives us a functional version to deal with:
this.setState(prevState => ({
test2: {
...prevState.test2,
name: value,
}
}));
Full Demo:
class Child extends React.Component{
constructor(props){
super(props)
this.state={
test2: this.props.data,
}
this.changeTextField = this.changeTextField.bind(this)
}
changeTextField(e){
const value = e.target.value
this.setState(prevState => ({
test2: {
...prevState.test2,
name: value,
}
}))
}
render(){
return(
<div>
<input type="text" value={this.state.test2['name']} onChange={this.changeTextField}/>
</div>
)
}
}
class Parent extends React.Component{
constructor(props){
super(props)
this.state={
test: {name: "hola"},
editing: false,
}
this.edit = this.edit.bind(this)
this.cancel = this.cancel.bind(this)
}
edit(){
this.setState({editing: true})
}
cancel(){
this.setState({editing: false})
}
render(){
return(
<div>
{(this.state.editing) ?
<React.Fragment>
<Child data={this.state.test}/>
<button onClick={this.cancel}>cancelar</button>
</React.Fragment>
:
<React.Fragment>
<h1>{this.state.test['name']}</h1>
<button onClick={this.edit}>edit</button>
</React.Fragment>
}
</div>
)
}
}
$(document).ready(function(){
ReactDOM.render(<Parent/>, document.getElementById("app"))
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<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="app"></div>
<script src="parent.jsx" type="text/babel"></script>
</body>
</html>

How to Render React App in Custom HTML5 Element instead div[id=root]

I am at requirement that I have build some ReactJs components but need to use them inside Custom HTML tags( just like normal tags )
I am trying to create a "Board" component which just displays a text "In board...". Now I am trying to use this in my HTML page as .
My board.js file:
class Board extends React.Component {
render() {
return (
<div>
<div className="status"> In board.... </div>
</div>
);
}
}
My HTML page:
<html>
<head>
<script src="https://unpkg.com/react#16/umd/react.production.min.js" crossorigin></script>
<script src="https://unpkg.com/react-dom#16/umd/react-dom.production.min.js" crossorigin></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.21.1/babel.min.js"></script>
<script src="board.js" type="text/babel"></script>
</head>
<body>
<Board />
</body>
</html>
tag must be treated like an HTML tag and should load React component and display the text "In board....".

In your case, you have to create using customElements API. You can use customElements.define Method to create your own but name should be hyphen separated.
window.customElements.define('message-board',
class extends HTMLElement {
constructor() {
super();
this.innerHTML = '';
}
}
);
Below is the Working Example.
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Board </title>
<script crossorigin src="https://unpkg.com/react#16/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom#16/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/babel-standalone#6/babel.min.js"></script>
<script>
window.customElements.define('message-board',
class extends HTMLElement {
constructor() {
super();
this.innerHTML = '';
}
});
</script>
<script type="text/babel">
class Board extends React.Component {
render() {
return (
<div>
<div className="status"> In board.... </div>
</div>
);
}
}
ReactDOM.render(
<Board />,
document.getElementsByTagName('message-board')[0]
);
</script>
<script>
</script>
</head>
<body>
<message-board />
</body>
</html>

Creating a custom element and rendering React component to this custom element can be done as below. Assuming "Board" is an React component.
window.customElements.define('message-board',
class extends HTMLElement {
constructor() {
super();
}
connectedCallback() {
ReactDOM.render(<Board />, this);
}
});
A working solution to convert a simple React component to HTML Custom element
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Board </title>
<script crossorigin src="https://unpkg.com/react#16/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom#16/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/babel-standalone#6/babel.min.js"></script>
<script crossorigin src="https://unpkg.com/#webcomponents/webcomponentsjs#2.0.3/custom-elements-es5-adapter.js"></script >
<script type="text/babel">
class Board extends React.Component {
render() {
return (
<div>
<div className="status"> In board.... </div>
</div>
);
}
}
window.customElements.define('message-board',
class extends HTMLElement {
constructor() {
super();
}
connectedCallback() {
ReactDOM.render(<Board />, this);
}
});
</script>
</head>
<body>
<div>
<message-board />
</div>
<div>
<message-board />
</div>
</body>
</html>

add react to a website : how import external node module?

from this ressource https://reactjs.org/docs/add-react-to-a-website.html I have integrate into my static website a basic component
<body>
<div id="like_button_container"></div>
<!-- Load React. -->
<!-- Note: when deploying, replace "development.js" with "production.min.js". -->
<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/react-content-loader#3.4.1/dist/react-content-loader.min.js" crossorigin></script>
<!-- Load our React component. -->
<script src="like_button.js"></script>
</body>
</html>
like_button.js :
'use strict';
class LikeButton extends React.Component {
constructor(props) {
super(props);
this.state = { liked: false };
}
render() {
if (this.state.liked) {
return 'You liked this.';
}
return (
<div>
<button onClick={() => this.setState({ liked: true }) }>
Like
</button>
<Facebook /> ???????????
</div>
);
}
}
let domContainer = document.querySelector('#like_button_container');
ReactDOM.render(<LikeButton />, domContainer);
How to use in this component an external module like https://www.npmjs.com/package/react-content-loader ?
I tried to add script https://unpkg.com/react-content-loader#3.4.1/dist/react-content-loader.min.js into html page with import satement in my component but I have an error "Uncaught ReferenceError: Facebook is not defined"

I never tried the code in Add React to a Website chapter of the React documentation. It was a good time to tinker with it.
There are more than one potential problem with your attached code. You do not load Babel in your index.html. At least in the question. So you could not use jsx syntax in the like_button.js.
The second one is that you could not use import here. You have to find what is the namespace of the package. I logged out the window object, checked that and it is ContentLoader.
The rest is easy I created a standalone index.html with babel:
https://codesandbox.io/s/w27pjmq355
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Hello React!</title>
<script src="https://unpkg.com/react#16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom#16/umd/react-dom.development.js"></script>
<script
src="https://unpkg.com/react-content-loader#3.4.1/dist/react-content-loader.min.js"
crossorigin
></script>
<script src="https://unpkg.com/babel-standalone#6.26.0/babel.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
console.log('window', window);
class App extends React.Component {
render() {
return (
<div>
<h1>Hello world!</h1>
<ContentLoader.Facebook />
</div>
);
}
}
ReactDOM.render(<App />, document.getElementById('root'));
</script>
</body>
</html>
I think you could try out React this way, but Babel usage is not recommended like this in production. I strongly recommend to install node and use create-react-app. This way you can use the whole toolchain in no time.
Or event create a new React sandbox on CodeSandbox.io

Uncaught ReferenceError: react is not defined in come in console include from cnd include

see I am new in react.js and include react and react dom ...but here, I am including cdn but the error will come with the console.kindly help me.
<html>
<head>
<script src="https://unpkg.com/react#0.14.7/dist/react.js">
</script>
<script src="https://unpkg.com/react-dom#0.14.7/dist/react-
dom.js">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-
core/5.8.23/browser.min.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
let HocCompont= (BasicComponent) => class extends
react.Component {
render(){
return(
<div className="abc"> <BasicComponent/> </div>
)
}
}
const StatelessCoponent = () =>{
return( <button>I am button</button>
)
}
let ExtendedButton = HocCompont(StatelessCoponent);
ReactDOM.render(<ExtendedButton/>,document.getElementById("app"));
</script>
</body>
</html>