React inline style - style prop expects a mapping from style properties to values, not a string

Use "styles" prop instead of style

<span className="myClass" style={{float : 'left', paddingRight : '5px'}} > </span>

There some ways to set style for React Components.

https://facebook.github.io/react/docs/context.html

https://github.com/facebookincubator/create-react-app

  1. using style={css_object} or style={{color: this.props.color}}

  2. using className="your-class-name"

React REPL

https://jscomplete.com/repl

1 style Object

// <span style={styles}>

const styles = {
    color: "red",
    background: "#0f0",
    fontSize: "32px"
};

const BTN = (props) => {
    return (
        <div>
           My name is <button>{props.name}</button>
           <hr/>
           I'm <span style={styles}>{props.age}</span> yeas old!
        </div>
    );
};

const infos = {
    name: "xgqfrms",
    age: 23
};

ReactDOM.render(<BTN {...infos} />, mountNode);




// <span style={{color: styles.color}}>

const styles = {
    color: "red",
    background: "#0f0",
    fontSize: "32px"
};

const BTN = (props) => {
    return (
        <div>
           My name is <button>{props.name}</button>
           <hr/>
           I'm <span style={{color: styles.color}}>{props.age}</span> yeas old!
        </div>
    );
};

const infos = {
    name: "xgqfrms",
    age: 23
};

ReactDOM.render(<BTN {...infos} />, mountNode);

2 className & stylesheet.css

import './styles.css';

/*
.classname-color{
    color: "red";
    background: "#0f0";
}
*/


const BTN = (props) => {
    return (
        <div>
            My name is <button>{props.name}</button>
            <hr/>
            I'm <span className="classname-color">{props.age}</span> yeas old!
        </div>
    );
};

const infos = {
    name: "xgqfrms",
    age: 23
};

ReactDOM.render(<BTN {...infos} />, mountNode);
.classname-color{
    color: "red";
    background: "#0f0";
}


JSX and HTML are different. See the graphic below from Udemy: Difference between JSX and HTML

In HTML it is

<div style="background-color: red;"></div>

In JSX you write

<div style={{ backgroundColor: 'red' }}></div>

Conditional inline formatting are different in both.

Tags:

Javascript

Css

Reactjs

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