# Forms Validation with Formik And Yup

-   In this project we use the Formik library and the Yup library to build
    validations to our forms
    -To build a validation to a field in a form we use a yup schema
    like so-

```js
const emailYup = Yup.string().email(emailMessage).required(requiredMessage);
```

-   This example is a validation for an email field-the validation says it is
    a required field and it must look like an email (a@email.com) we then can
    build a schema that will use this validation.

```js
public static emailValidationSchema =
        Yup.object().shape({
		email: emailYup,
	});
```

-   this example shows that the field with the prop of `name` that has
    the value `name` will have this validation. for more validations
    examples you can go to the `Validations` folder in Common.

In order to add the validation to our form we wiil wrap our form with our
custom component `FormWrapper.tsx` that use`s the formik library.
In order to use the form wrapper and formik we need to pass 3 props to
the form wrapper:

1. The initial values for the forms- those will be the names of the
   fields(the field will have a prop `name`).

1. The validation schema- like the one we saw before
   (the `emailValidationSchema`).

1. The onSubmit method- the method that will be called when the button of type
   `submit` in your form is pressed.

<br>
there is an example of a form in the Form Container

-   There are other things we get from formik like the `handleChange` and
    `handleBlur` props that works automaticly on the fields. another example
    is the `errors` and `touched` props that we can use to show our errors
    from the validation.

-   [More about formik](https://jaredpalmer.com/formik/docs/overview)