/TypeScript/Email validation pattern react

Email validation pattern react

Input type email react js-validation

    class Test extends React.Component {
        constructor(props){
           super(props);
      
           this.state = {
               fields: {},
               errors: {}
           }
        }
    
        handleValidation(){
            let fields = this.state.fields;
            let errors = {};
            let formIsValid = true;

            //Name
            if(!fields["name"]){
               formIsValid = false;
               errors["name"] = "Cannot be empty";
            }
      
            if(typeof fields["name"] !== "undefined"){
               if(!fields["name"].match(/^[a-zA-Z]+$/)){
                  formIsValid = false;
                  errors["name"] = "Only letters";
               }        
            }
       
            //Email
            if(!fields["email"]){
               formIsValid = false;
               errors["email"] = "Cannot be empty";
            }
      
            if(typeof fields["email"] !== "undefined"){
               let lastAtPos = fields["email"].lastIndexOf('@');
               let lastDotPos = fields["email"].lastIndexOf('.');

               if (!(lastAtPos < lastDotPos && lastAtPos > 0 && fields["email"].indexOf('@@') == -1 && lastDotPos > 2 && (fields["email"].length - lastDotPos) > 2)) {
                  formIsValid = false;
                  errors["email"] = "Email is not valid";
                }
           }  

           this.setState({errors: errors});
           return formIsValid;
       }
        
       contactSubmit(e){
            e.preventDefault();

            if(this.handleValidation()){
               alert("Form submitted");
            }else{
               alert("Form has errors.")
            }
      
        }
    
        handleChange(field, e){         
            let fields = this.state.fields;
            fields[field] = e.target.value;        
            this.setState({fields});
        }
    
        render(){
            return (
                <div>           
                   <form name="contactform" className="contactform" onSubmit= {this.contactSubmit.bind(this)}>
                        <div className="col-md-6">
                          <fieldset>
                               <input ref="name" type="text" size="30" placeholder="Name" onChange={this.handleChange.bind(this, "name")} value={this.state.fields["name"]}/>
                               <span style={{color: "red"}}>{this.state.errors["name"]}</span>
                              <br/>
                             <input refs="email" type="text" size="30" placeholder="Email" onChange={this.handleChange.bind(this, "email")} value={this.state.fields["email"]}/>
                             <span style={{color: "red"}}>{this.state.errors["email"]}</span>
                             <br/>
                             <input refs="phone" type="text" size="30" placeholder="Phone" onChange={this.handleChange.bind(this, "phone")} value={this.state.fields["phone"]}/>
                             <br/>
                             <input refs="address" type="text" size="30" placeholder="Address" onChange={this.handleChange.bind(this, "address")} value={this.state.fields["address"]}/>
                             <br/>
                         </fieldset>
                      </div>
          
                  </form>
                </div>
          )
        }
    }

    React.render(<Test />, document.getElementById('container'));

Source: stackoverflow.com

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}$"

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