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>
Here is a great reference from W3Schools which also shows you how to create an object with styling information, and refer to it in the style attribute:reference for how to style React using CSS
There some ways to set style for React Components.
https://facebook.github.io/react/docs/context.html
https://github.com/facebookincubator/create-react-app
using
style={css_object}
orstyle={{color: this.props.color}}
using
className="your-class-name"
React 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:
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.