Simple ReactJS code not working

Question

The following Simple ReactJS code is not working. Newbie needs help please!

<html lang="en">
<head>
<meta charset="UTF-8">
<title>ReactJS Test</title>
<script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/[email protected]/babel.min.js"></script>
</head>
<body>
<div id="container"></div>

<script type="text/babel">
var currentLocation = window.location;
ReactDOM.render(
        <div>
            <p>currentLocation : {currentLocation}</p>
        </div>,
    document.getElementById('container')
);
</script>
</body>
</html>

And Chrome console shows helpless error messages like this:

react-dom.production.min.js:67 Uncaught Error: Minified React error #31; visit http://facebook.github.io/react/docs/error-decoder.html?invariant=31&args[]=http%3A%2F%2Fxxxxxxx.com%3A8080%2F_test%2Fsitetest_new.jsp&args[]= for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
    at m (react-dom.production.min.js:67)
    at qb (react-dom.production.min.js:82)
    at z (react-dom.production.min.js:87)
    at C (react-dom.production.min.js:89)
    at react-dom.production.min.js:94
    at g (react-dom.production.min.js:43)
    at f (react-dom.production.min.js:43)
    at beginWork (react-dom.production.min.js:48)
    at e (react-dom.production.min.js:18)
    at k (react-dom.production.min.js:19)

Thanks in advance!

Did you visit the link provided or use a non-production build? — Dave Newton
– Dave Newton, Commented Sep 28, 2017 at 1:00

Dan Kreiger · Accepted Answer · 2017-09-28 01:40:45Z

3

window.location returns an object. You can't embed a standalone object in JSX. You can only embed JavaScript expressions.

Try using JSON.stringify() to convert your object to a string.

You can run the snippet below or check out this CodePen Demo.

var currentLocation = window.location;

ReactDOM.render(
        <div>
            <p>currentLocation : {JSON.stringify(currentLocation)}</p>
        </div>,
    document.getElementById('container')
);

<div id="container"></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>

Note: If you just want a string value from your window.location object (e.g. href), you don't need JSON.stringify().

You could simply use window.location.href directly in your JSX (or set var currentLocation = window.location.ref;) - example.

edited Sep 28, 2017 at 1:40

answered Sep 28, 2017 at 1:08

Dan Kreiger

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1 Comment

Dan Kreiger Over a year ago

No problem! I'm glad it helped :)

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