/Javascript/React/Email validation in react js

Email validation in react js

import React from 'react';
import {sendFormData} from '../services/';

class Signup extends React.Component{
  constructor(props){
    super(props);
     this.state = {
       isDisabled:true
     }                                                                                                 
     this.submitForm = this.submitForm.bind(this);
  }
  validateEmail(email){
   const pattern = /[a-zA-Z0-9]+[\.]?([a-zA-Z0-9]+)?[\@][a-z]{3,9}[\.][a-z]{2,5}/g;
   const result = pattern.test(email);
   if(result===true){
     this.setState({
       emailError:false,
       email:email
     })
   } else{
     this.setState({
       emailError:true
     })
   }
 }
 handleChange(e){
  const target = e.target;
  const value = target.type === 'checkbox' ? target.checked : target.value;
  const name = target.name;
  this.setState({
    [name]: value
  });
  if(e.target.name==='firstname'){
    if(e.target.value==='' || e.target.value===null ){
      this.setState({
        firstnameError:true
      })
    } else {
      this.setState({
        firstnameError:false,     
        firstName:e.target.value
      })
    }
  }
  if(e.target.name==='lastname'){
    if(e.target.value==='' || e.target.value===null){
      this.setState({
        lastnameError:true
      })
    } else {
      this.setState({
        lastnameError:false,
        lastName:e.target.value
      })
    }
  }
  if(e.target.name==='email'){
   this.validateEmail(e.target.value);
  }
  if(e.target.name==='password'){
    if(e.target.value==='' || e.target.value===null){
      this.setState({
        passwordError:true
      })
    } else {
      this.setState({
        passwordError:false,
        password:e.target.value
      })
    }
 }
 if(this.state.firstnameError===false && this.state.lastnameError===false && 
  this.state.emailError===false && this.state.passwordError===false){
    this.setState({
      isDisabled:false
    })
 }
}
submitForm(e){
  e.preventDefault();
  const data = {
   firstName: this.state.firstName,
   lastName: this.state.lastName,
   email: this.state.email,
   password: this.state.password
  }
  sendFormData(data).then(res=>{
    if(res.status===200){
      alert(res.data);
      this.props.history.push('/');
    }else{

    } 
  });
 }
render(){
return(
  <div className="container">
    <div className="card card-login mx-auto mt-5">
      <div className="card-header">Register here</div>
        <div className="card-body">
            <form id="signup-form">
              <div className="form-group">
                <div className="form-label-group">
                  <input type="text" id="firstname" name="firstname" className="form-control" placeholder="Enter firstname" onChange={(e)=>{this.handleChange(e)}} />
                  <label htmlFor="firstname">firstname</label>
                  {this.state.firstnameError ? <span style={{color: "red"}}>Please Enter some value</span> : ''} 
                </div>
              </div>
              <div className="form-group">
                <div className="form-label-group">
                  <input type="text" id="lastname" name="lastname" className="form-control" placeholder="Enter lastname" onChange={(e)=>{this.handleChange(e)}} />
                  <label htmlFor="lastname">lastname</label>
                  {this.state.lastnameError ? <span style={{color: "red"}}>Please Enter some value</span> : ''}
                </div>
              </div>
              <div className="form-group">
                <div className="form-label-group">
                  <input type="email" id="email" name="email" className="form-control" placeholder="Enter your email" onChange={(e)=>{this.handleChange(e)}} />
                  <label htmlFor="email">email</label>
                  {this.state.emailError ? <span style={{color: "red"}}>Please Enter valid email address</span> : ''}
                </div>
              </div>                
              <div className="form-group">
                <div className="form-label-group">
                  <input type="password" id="password" name="password" className="form-control" placeholder="Password" onChange={(e)=>{this.handleChange(e)}} />
                  <label htmlFor="password">Password</label>
                  {this.state.passwordError ? <span style={{color: "red"}}>Please enter some   value</span> : ''}
                </div>
              </div>                
              <button className="btn btn-primary btn-block" disabled={this.state.isDisabled} onClick={this.submitForm}>Signup</button>
            </form>
        </div>
      </div>
    </div>
  );
 }
}
export default Signup;

Source: stackoverflow.com

Email validation pattern react

 pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3}$"

-1

Similar codes

0 vote202 views1 answer
Float right react native
Javascript React
1 vote213 views1 answer
Failed to transform react-native-reanimated-65.aar
Javascript React
142 votes321 views5 answers
Install react
Javascript React
0 vote217 views1 answer
Card react native
Javascript React
16 votes199 views3 answers
Loop in react depending on number
Javascript React
15 votes224 views3 answers
Image source react native
Javascript React
19 votes205 views6 answers
React native build android apk
Javascript React
0 vote199 views1 answer
React import json
Javascript React
0 vote206 views1 answer
React native run real device
Javascript React
0 vote213 views1 answer
React native-base DatePicker comes up Minimized on iOS Asked
Javascript React