React.js Archives

import React, { Component } from 'react';
import { Button, Form, FormGroup, Label, Input, Fade  } from 'reactstrap';
import _ from 'lodash';

const validationMethods =  {
    required : (field, value) => {
        if (!value.toString().trim().length) {
            return  `This ${field} field is required.`
        }
    },
    isEmail: (field,value) => {
        var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
        if (reg.test(value) === false) {
            return  `Invalid Email Address.`
        }        
    }
} 

const validateForm = (form) => {
    const loginForm = document.getElementById(form)
     return loginForm.querySelectorAll('[validations]');
}

const runValidationRules  = (element, errors) => {
    const target = element;
    const field =  target.name;
    const value = target.value
    let validations =  element.getAttribute('validations');
    validations =  validations.split(',')

    for (let validation of validations) {
        validation = validation.split(':');
        const rule = validation[0];
        const error = validationMethods[rule](field, value);
        errors[field] = errors[field] || {};
        if(error) {
            errors[field][rule] = error;
        } else {
            if(_.isEmpty(errors[field])) {
                delete errors[field];
            } else {
                delete errors[field][rule];
            }
        }
    }

    return errors;
}


export default class Login extends Component {

    constructor(props) {
        super(props);
        this.state = {
            email: '',
            password: '',
            errors: []
        }
    }



    login = (event) => {

        event.preventDefault();

        const formElements = validateForm("loginForm");
 
        formElements.forEach(element=> {
           const errors = runValidationRules(element, this.state.errors);
            this.setState({
                errors: errors
            });
        })

        const email = this.state.email;
        const password = this.state.password;
        const errors =  this.state.errors;
        console.log(email, password, errors);
    }

    handleChange = (event) => {
        const target = event.target;
        const field =  target.name;
        const value = target.value

        const errors = runValidationRules(target, this.state.errors);

        this.setState({
            errors: errors
        });

        this.setState({
            [field]:  value
        });
    }

    render() {
        return (
            <div className="container">
                <Form id="loginForm" method="post" onSubmit={this.login}>
                    <FormGroup>
                        <Label for="email">Email</Label>
                        <Input
                            type="text"
                            validations={['required','isEmail']}
                            name="email"
                            value={this.state.email}
                            onChange={this.handleChange}
                            id="email"
                            placeholder="Enter your email address."
                        />
                      <FromValidationError field={this.state.errors.email} />
                    </FormGroup>
                    <FormGroup>
                        <Label for="password">Password</Label>
                        <Input
                            type="password"
                            validations={['required']}
                            name="password"
                            value={this.state.password}
                            onChange={this.handleChange}
                            id="password"
                            placeholder="Enter your password."
                        />
                        <FromValidationError field={this.state.errors.password} />
                    </FormGroup>
                    <Button>login</Button>
                </Form>
            </div>
        );
    }
}

const FromValidationError = props => (
    <Fade in={Boolean(props.field)}  tag="p" className="error">
       { props.field ?  Object.values(props.field).shift() : '' } 
  </Fade>
);

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

import React, { Component } from 'react';

import { Button, Form, FormGroup, Label, Input, Fade } from 'reactstrap';

import _ from 'lodash';

const validationMethods = {

required : (field, value) => {

if (!value.toString().trim().length) {

return `This ${field} field is required.`

}

isEmail: (field,value) => {

var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

if (reg.test(value) === false) {

return `Invalid Email Address.`

}

const validateForm = (form) => {

const loginForm = document.getElementById(form)

return loginForm.querySelectorAll('[validations]');

}

const runValidationRules = (element, errors) => {

const target = element;

const field = target.name;

const value = target.value

let validations = element.getAttribute('validations');

validations = validations.split(',')

for (let validation of validations) {

validation = validation.split(':');

const rule = validation[0];

const error = validationMethods[rule](field, value);

errors[field] = errors[field] || {};

if(error) {

errors[field][rule] = error;

} else {

if(_.isEmpty(errors[field])) {

delete errors[field];

} else {

delete errors[field][rule];

}

return errors;

}

export default class Login extends Component {

constructor(props) {

super(props);

this.state = {

email: '',

password: '',

errors: []

}

event.preventDefault();

const formElements = validateForm("loginForm");

formElements.forEach(element=> {

const errors = runValidationRules(element, this.state.errors);

this.setState({

errors: errors

});

})

const email = this.state.email;

const password = this.state.password;

const errors = this.state.errors;

console.log(email, password, errors);

}

handleChange = (event) => {

const target = event.target;

const field = target.name;

const value = target.value

const errors = runValidationRules(target, this.state.errors);

this.setState({

errors: errors

});

this.setState({

[field]: value

});

}

render() {

return (

<Label for="email">Email</Label>

<Input

type="text"

validations={['required','isEmail']}

name="email"

value={this.state.email}

onChange={this.handleChange}

id="email"

placeholder="Enter your email address."

</FormGroup>

<Label for="password">Password</Label>

<Input

type="password"

validations={['required']}

name="password"

value={this.state.password}

onChange={this.handleChange}

id="password"

placeholder="Enter your password."

</FormGroup>

<Button>login</Button>

</Form>

</div>

);

}

const FromValidationError = props => (

{ props.field ? Object.values(props.field).shift() : '' }

</Fade>

);

I hope you like this Post, Please feel free to comment below, your suggestion and problems if you face – we are here to solve your problems.ArjunI am Arjun from Hyderabad (India). […]

Arjun Praveen

Login Form with ReactJS

How to fetch data from a remote API in React.js