Adding react to a simple project - javascript

I'm trying to understand more about how React works, so I'm experimenting a bit. When I do this
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello World</title>
<script src="https://unpkg.com/react#17/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom#17/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/#babel/standalone/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
ReactDOM.render(
<h1>Hello, world!</h1>,
document.getElementById('root')
);
</script>
</body>
</html>
it outputs hello world, but when I try to make the script it's own file by doing...
index.html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello World</title>
<script src="https://unpkg.com/react#17/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom#17/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/#babel/standalone/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel" src="script.js">
</script>
</body>
</html>
script.js:
ReactDOM.render(
<h1>Hello, world!</h1>,
document.getElementById('root')
);
I get an empty page when I do it that way, any help?

Related

How to enable JSX intellisense in HTML <script> tag?

I want JSX Intellisense in Visual Studio Code in HTML files, right inside the <script> tag. Currently, I can't figure out a way to do so.
Here's my HTML file:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Working with forms - Project 2</title>
</head>
<body>
<div id="root"></div>
<script src="https://unpkg.com/react#18/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom#18/umd/react-dom.development.js" crossorigin></script>
<script src="https://unpkg.com/babel-standalone#6/babel.min.js"></script>
<script type="text/babel">
function App() {
return <React.Fragment>
<h1>Working with forms - Project 2</h1>
</React.Fragment>
}
ReactDOM.render(<App/>, document.getElementById('root'));
</script>
</body>
</html>

How to avoid error 'Unexpected token <' with a React app when running babel from a CDN?

I am new to React and would at the moment like to run everything using CDNs. It seems that similar questions to avoid the same error I am getting ("Uncaught SyntaxError: Unexpected token <") are solved by including ''. But that is not working in this example when I run this very basic React app. Does it not work because Babel cannot transcompile the script from this same file?
<!DOCTYPE html>
<html lang="en">
<head>
<body>
<meta charset="UTF-8">
<title>Title</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 type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.7.7/babel.min.js"></script>
<script type="text/babel"></script>
<div id="app"></div>
</head>
<body>
<script>
console.log('App.js is running!');
var Template = (
<div>
<h1>John</h1>
<p>Age: 26</p>
<p>Location: Philadelphia</p>
</div>
)
var AppRoot = document.getElementById('app')
ReactDOM.render(Template, AppRoot)
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>First React App</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>
</head>
<body>
<div id='app'></div>
<script type='text/babel'>
console.log('App.js is running!');
class Template extends React.Component{
render(){
return(
<div>
<h1>John</h1>
<p>Age: 26</p>
<p>Location: Philadelphia</p>
</div>
)
}
}
//ReactDom function starting
var AppRoot = document.getElementById('app')
ReactDOM.render(<Template/>, AppRoot)
</script>
</body>
</html>
Use Reactjs version 16. Create class-based component then render it. Use this documentary for better understanding. Link

You have to add type='text/babel' to your script. I also recommend to use at least react 16 if you want to start learning. You might also want to make sure to use UMD versions of react and reactDOM to make sure they run in the browser.
<!DOCTYPE html>
<html>
<head>
<title>First React App</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>
</head>
<body>
<div id='app'></div>
<script type='text/babel'>
console.log('App.js is running!');
var Template = (
<div>
<h1>John</h1>
<p>Age: 26</p>
<p>Location: Philadelphia</p>
</div>
)
var AppRoot = document.getElementById('app')
ReactDOM.render(Template, AppRoot)
</script>
</body>
</html>

ReactJS babel script is not dispaying content

I am currently experimenting with ReactJS and I am not sure why this html page is not displaying any text for the input control (and also the control width is zero).
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Textbox example</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">
<link rel="stylesheet" href="css/example.css" type="text/css" />
</head>
<body>
<div id="content">
<form id="mainform">
</form>
</div>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.min.js"></script>
<script src="http://code.jquery.com/jquery-2.2.2.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
<script type="text/babel">
function textbox(props) {
return (<input type='text' value={props.value} class='form-control' />);
}
function component() {
return (<div class='component'></div>);
}
ReactDOM.render(
<textbox value="Hello World" />,
document.getElementById('mainform')
);
</script>
</body>
</html>

Few things you need to change:
*Change doctype to DOCTYPE.
*Name of react component should start with upper case, otherwise it will be treated as HTML element.
*Don't include react and react-dom reference like this:
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
Include the reference in HTML file, like this:
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
Or if you are maintaining different files then import it on the top of the file.
Check the working code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Textbox example</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">
<link rel="stylesheet" href="css/example.css" type="text/css" />
</head>
<body>
<div id="content">
<form id="mainform">
</form>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.min.js"></script>
<script src="http://code.jquery.com/jquery-2.2.2.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
<script type="text/babel">
function Textbox(props) {
return (<input type='text' value={props.value} class='form-control' />);
}
function Components() {
return (<div class='component'></div>);
}
ReactDOM.render(
<Textbox value="Hello World" />,
document.getElementById('mainform')
);
</script>
</body>
</html>

Not able to render a simple ReactDOM div

I am a newbie to ReactJS. I was trying yo render a simple div using ReactDOM but not able to do so. Here's my code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hello React</title>
</head>
<body>
<div id="root">
</div>
<script src="https://unpkg.com/react#15/dist/react.js"></script>
<script src="https://unpkg.com/react-dom#15/dist/react-dom.js"></script>
<script>
ReactDOM.render(
<h1>Hello, world!</h1>,
document.getElementById('root')
);
</script>
</body>
</html>
Can anybody guide me as to why its happening ?
Note - I am using React 15.4.2 and Chrome version 57.

You need to add the transpiler babel to your project. you can adapt my example below to your needs.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello World</title>
<script src="https://unpkg.com/react#latest/dist/react.js"></script>
<script src="https://unpkg.com/react-dom#latest/dist/react-dom.js"></script>
<script src="https://unpkg.com/babel-standalone#6.15.0/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
ReactDOM.render(<h1>Hello, world!</h1>, document.getElementById('root'));
</script>
</body>
</html>
see another example that doesn't use babel
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello World</title>
<script src="https://unpkg.com/react#latest/dist/react.js"></script>
<script src="https://unpkg.com/react-dom#latest/dist/react-dom.js"></script>
</head>
<body>
<div id="root"></div>
<script>
ReactDOM.render(React.createElement('h1', null, 'hello'), document.getElementById('root'));
</script>
</body>
</html>

You are attempting to use JSX without any transpiler (babel etc).
Try this instead:
ReactDOM.render(
React.createElement('hi', 'Hello, world!'),
document.getElementById('root')
);
Or add a script and type to handle JSX.

My page won't load (ReactJS)

I'm connected to my server via npm install -g http-server on Terminal, that's working fine. I just want to see if my h1 tag works so I can proceed to making a practice website. I feel like my mainPage.html may be a little off.
Here's my mainPage.html file:
<!DOCTYPE html>
<html>
<head>
<title>Testing</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
</body>
<div id="website"></div>
<script type="text/babel" src="mainPage.js"></script>
</script>
</html>
Here's my mainPage.js file:
var Website = React.createClass({
render: function() {
return(
<h1>Why won't my h1 tag appear!</h1>
);
}
});
ReactDOM.render(<Website/>, document.getElementById('website'));

You need to import babel.js, react and reactDOM
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.23.1/babel.min.js"></script>
<script src="https://unpkg.com/react#15/dist/react.min.js"></script>
<script src="https://unpkg.com/react-dom#15/dist/react-dom.min.js"></script>

Include the reference of react, react-dom and babel, Check this working code:
<!DOCTYPE html>
<html>
<head>
<title>Testing</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.23.1/babel.min.js"></script>
</head>
<body>
</body>
<div id="website"></div>
<script type="text/babel" >
var Website = React.createClass({
render: function() {
return(
<h1>Why won't my h1 tag appear!</h1>
);
}
});
ReactDOM.render(<Website/>, document.getElementById('website'));
</script>
</html>

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