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Answers for "react input only numbers integer"

Javascript
2

react allow only numbers in input

class App extends React.Component{
   constructor(){
      super();
      this.state = {value: ''};
      this.onChange = this.onChange.bind(this)
   }
   
   onChange(e){
      const re = /^[0-9\b]+$/;
      if (e.target.value === '' || re.test(e.target.value)) {
         this.setState({value: e.target.value})
      }
   }
   
   render(){
     return <input value={this.state.value} onChange={this.onChange}/>
   }
}

ReactDOM.render(<App/>,document.getElementById('app'))
Posted by: Guest on December-30-2020
0

react input number validation

// Validation with REGEX
const rx_live = /^[+-]?\d*(?:[.,]\d*)?$/;

class TestForm extends React.Component {
  constructor() {
    super();
    this.state = {
      depositedAmount: ''
    };
  }

  handleDepositeAmountChange = (evt) => {
    if (rx_live.test(evt.target.value))
        this.setState({ depositedAmount : evt.target.value });
 }
  
  render() {
    return (
      <form>
       <input
        type="text"
        id="depositedAmount"
        maxLength={9}
        pattern="[+-]?\d+(?:[.,]\d+)?"
        placeholder="Enter amount"
        onChange={this.handleDepositeAmountChange}
        value={this.state.depositedAmount}
       />
      </form>
    )
  }
}
Posted by: Guest on July-04-2020

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