React Chinese

by karlovac

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}


input {
  margin-right: 5px;
}

React

class ChineseInput extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
    	text: 'hi'
    }
  }
  
  isChinese = testString => {
    const re = /^[\u4E00-\u9FA5]+$/;
    return re.test(testString);
  };
  
  handleTextChange = (e) => {
  	console.log('e.target.value', e.target.value);
    let newValue = e.target.value;
    if (!this.isChinese(newValue)) {
     	newValue = ''
    }
  	
  	this.setState({
    	text: newValue
    });
  };
  
  render() {
    return (
      <div>
        <input type="text" value={this.state.text}
          onChange={this.handleTextChange} />
        <div>Text in state: {this.state.text} </div>
      </div>
    )
  }
}

ReactDOM.render(<ChineseInput />, document.querySelector("#app"))