react-hooks-validation

Install react-hooks-validation

npm i react-hooks-validation

You should have momentjs installed in order to make it work. momentjs is required because it handles date parsing and formatting. You can install it by: npm i moment.

How to use it

DEMO

useValidation(object)

useValidation(object) expects an object to be passed in. ex:

const firstNameObj = {
    name: 'firstName',
    defaultValue: '',
    required: true
}
const firstName = useValidation(firstNameObj);

useValidation(object) returns a new object:

{
    name: 'name', //name
    value: '', //the current value
    error: false, //returns true or false to let us know if validation is ok or not
    required: false, //returns true or false if field is required or not
    defaultValue: '', //returns defaultValue if we provided one
    onChange: function(value), //we need to call onChange everytime we need to change a value
    reset: function() //we call that if we need to reset validation for that field
}

validateAll(object)

validateAll(object) expects an object that contains objects from useValidation(object). And it returns null if no error, or it returns an array of names that failed validation. ex. if both firstName and lastName failed here is what array looks like: ['firstName', 'lastName']

reset(object)

reset(object) expects an object that contains objects from useValidation(object). And it will reset the validation for the object, and all values will be set to their defaultValues.

DEMO

Here is a simple demo of how to use useValidation(object), validateAll(object) and reset(object) together:

import useValidation, { validateAll, reset } from 'react-hooks-validation';

function MyClass(){
    const schema = {
        firstName: {
            name: 'firstName',
            defaultValue: '',
            required: true
        },
        lastname: {
            name: 'lastName',
            defaultValue: '',
            required: true
        }
    };

    const data = {
        firstName: useValidation(schema.firstName),
        lastName: useValidation(schema.lastName)
    }

    function handleChange({currentTarget: input}){
        data[input.name].onChange(value);
    }

    function handleOnSubmit(e){
        e.preventDefault();
        reset(data);
    }

    return(
        <form onSubmit={handleOnSubmit}>
            <div>
                <label>First Name:</label>
                <input type='text' name='firstName' value={firstName.value} onChange={handleChange} />
                {firstName.error && <p>This field should not be blank</p>}
            </div>
            <div>
                <label>Last Name:</label>
                <input type='text' name='lastName' value={lastName.value} onChange={handleChange} />
                {lastName.error && <p>This field should not be blank</p>}
            </div>
            <div>
                <button type='submit' disabled={validateAll(data)}>SUBMIT</button>
            </div>
        </form>
    )
}

useValidation(object, depended)

There is another option to use useValidation(object, depended) by passing a second argument called depended, which is if that value is depended on other value. ex. We all expect confirmPassword to be equal to password, so we can use it there:

    const schema = {
        password: {
            name: 'password',
            defaultValue: '',
            required: true,
            min: 6,
            max: 16
        },
        confirmPassword: {
            name: 'confirmPassword',
            defaultValue: '',
            required: true
        }
    };

    const data = {
        password: useValidation(schema.password)
    }
    data.confirmPassword = useValidation(schema.confirmPassword, data.password);

Properties

• name : string required. Used to determine the name of the input

• value: value required. Used to determine the default value. You can let as empty string if you dont want it to have a value at the beginning.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo' //the default value will be 'Kosovo' now
    }
}

• required: boolean default: false. Used to determine if a value is required or not.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
        required: true // this will be required now
    },
    country: { //this one will not be required
        name: 'country',
        defaultValue: 'Kosovo'
    }
}

• disabled: boolean default : false. Used to determine if a value should be disabled for changes.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo',
        disabled: true //now you will not be able to change this value
    }
}

• number: boolean optional. Used to determine if the value should be number.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    age: {
        name: 'age',
        defaultValue: 2,
        number: true // we will require this to be number now
    }
}

• min: number optional. Used to determine minimum length for strings and arrays or minimum number for numbers.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
        min: 2 //the minimum required length of the value is 2
    },
    age: {
        name: 'age',
        defaultValue: 18,
        number: true,
        min: 18 //the minimum required number is 18
    },
    projects: {
        name: 'projects',
        defaultValue: [],
        array: true,
        min: 2 //the array shuld have minimum 2 elements
    }
}

• max: number optional. Used to determine maximum length for strings and arrays or maximum number for numbers.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
        max: 30 // the maximum value length is 30 characters
    },
    age: {
        name: 'age',
        defaultValue: 18,
        number: true,
        min: 18, //the mimumum number required is 18
        max: 60 // the maximum number can be 60
    },
    projects: {
        name: 'projects',
        defaultValue: [],
        array: true,
        max: 2 //the array shuld have maximum 2 elements
    }
}

• array: boolean optional. Used to determine if the value should be array.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    countries: {
        name: 'countries',
        defaultValue: ['Kosovo', 'Albania', 'United States', 'Sweden'],
        array: true // we will require value to be array
    }
}

• email: boolean optional. Used to determine if the value should match an email pattern.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    email: {
        name: 'email',
        defaultValue: '',
        email: true // this value now will need to match an email pattern
    }
}

• boolean: boolean optional. Used to determine if the value should be boolean.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    acceptTerms: {
        name: 'acceptTerms',
        defaultValue: false,
        boolean: true // this value needs to be boolean now
    }
}

• regex: regex optional. Used to validate a value agains a regular expression.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: '',
        regex : /^[a-zA-Z]+$/ //now the value should match the regex pattern
    }
}

• date: boolean optional. Used to determine if the value should be a date.
  • format: string optional. Used to determine the format of the date.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    birthday: {
        name: 'birthday',
        defaultValue: '',
        date: true // the value will need to be in a date format, and it will try to parse any format
    },
    startDate: {
        name: 'startDate',
        defaultValue: '',
        date: true, // the value will need to be in a date format
        format: 'DD.MM.YYYY' // and will need to be in this format.
    }
}

• greater: number optional. Used to determine that the string and array length or number should be greater than that.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
        greater: 2 // the value length should be more than 2
    },
    experience: {
        name: 'experience',
        defaultValue: 3,
        number: true,
        greater: 2 // the number should be greater than 2
    },
    projects: {
        name: 'projects',
        defaultValue: [],
        array: true,
        greater: 2 //the array shuld have more than 2 elements
    }
}

• less: number optional. Used to determine that string length or number should be less than that.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',,
        less: 100 // the value length should be less than 100
    },
    experience: {
        name: 'experience',
        defaultValue: 1,
        number: true,
        less: 2 // the number should be less than 2
    },
    projects: {
        name: 'projects',
        defaultValue: [],
        array: true,
        less: 4 //the array shuld have less than 4 elements
    }
}

• uppercase: boolean optional. Used to determine if the string should be uppercase.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'KOSOVO',
        uppercase: true // now the value should be in uppercase
    }
}

• lowercase: boolean optional. Used to determine if the string should be lowercase.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'kosovo',
        lowercase: true // now the value should be in lowercase
    }
}

• valid: value optional. Used to determine which value is valid.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo',
        valid: 'Kosovo' //now the value should match the 'Kosovo' string
    },
    age: {
        name: 'age',
        defaultValue: 18,
        number: true,
        valid: 18 //now the value should be 18
    }
}

• is: array optional. Used to determine that the value should be one of the array elements.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo',
        is: ['Kosovo', 'Albania'] // now the value should be one of values in this array
    }
}

• contains: value optional. Used to determine that the value should contain that value in.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo',
        contains: 'os' // the value should contain 'os' string inside
    }
}

• invalid: value optional. Used to determine which value is invalid. The opposite of valid.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo',
        invalid: 'Africa' // the value should not be 'Africa'
    }
}

• isNot: array optional. Used to determine that the value shold not be one of the array elements. The opposite of is.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo',
        isNot: ['Africa', 'Australia'] // the value should not be one of the elements in this arrat
    }
}

• containsNot: value optional. Used to determine that the value should not contain that value in.

const data = {
    firstName: {
        name: 'firstName',
        defaultValue: '',
    },
    country: {
        name: 'country',
        defaultValue: 'Kosovo',
        containsNot: 'a' //the value should not contain 'a'.
    }
}