리엑트에서 input 입력값 처리 

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import React, { Component } from 'react'
import { Link } from 'react-router-dom'
import './index.scss'

class Index extends Component {
	constructor (props) {
		super(props)

		this.initialQ = this.props.q || ''
		this.state = { q: this.initialQ }

	}

	handleInputChange = (e) => {
		const target    = e.target;
		//const type      = e.type;

		const name      = target.name;
		const value     = target.value.trim();
    const modifiedValue = value.substring(0,10);
    
		this.setState({
			[name]: modifiedValue
		});
	}

	handleInputPress = (e) => {
		if (e.key === 'Enter') {
			this.goSearch()
		}
	}

	goSearch = (q = this.state.q) => {
		if (q) {
			this.props.history.push(`/search/${q}`)
		}
	}

	render () {
		return (
		  <React.Fragment>
        <input type='text' name='q' className={`searchbox`}
               value={this.state.q}
               onChange={this.handleInputChange}
               onKeyPress={this.handleInputPress}/>
		  </React.Fragment>
		)
	}
}

export default Index

Input 숫자 키패드

iOS 사파리에서는 maxLength가 먹지 않아 js로 막아야 합니다.

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<input type='number'
       pattern="[0-9]*"
       placeholder='코드입력'
       maxLength="6"
       className={this.state.errorMsg && 'error'}
       name= "inputCode"
       value={this.state.inputCode}
       onChange={this.handleInputChange}
       onKeyPress={this.handleInputPress}/>