README.md

React-Form + Formik + Yup + MaterialUI +GraphQL

This is a quick example of how to use form validations in React, using Formik and Yup as validations schema.

We will use Material-UI to give it a touch of style next to the formik-material-ui package.

This example allows us to integrate Material-UI to our forms already built in Formik without affecting their operation.

Let's use GraphQL with Apollo Client to save our information

Note:

To save the information of this example I make use of a tutorial created previously by me here

Formik Form Validation - customerForm.js

The CustomerForm component contains a registration form built with the <Formik /> component.
The initial values of each field are defined in the initialValues property.
All validation rules and their respective error messages are set in the validationSchema property, which for this constraint we are using Yup to define our validation scheme. The onSubmit property receives the values of our field in addition to a resetForm property that allows us to reset the Form

More information

• Formik
• Yup
• formik-material-ui
• material-ui
• Apollo GraphQL

Import our Packages

import React from "react";
import gql from "graphql-tag";
import Button from "@material-ui/core/Button";
import { Formik, Field, Form } from "formik";
import { TextField } from "formik-material-ui";
import * as Yup from "yup";
import { useMutation } from "@apollo/react-hooks";
import { GET_CUSTOMERS } from "./customers";

We define the model of our mutation

const ADD_CUSTOMER = gql`
  mutation CreateCustomer(
    $FullName: String
    $FirstName: String
    $SecondName: String
    $LastName: String
  ) {
    CreateCustomer(
      FullName: $FullName
      FirstName: $FirstName
      SecondName: $SecondName
      LastName: $LastName
    )
  }
`;

Define our copoment

export function CustomersForm() {
  const [addCustomer, { data }] = useMutation(ADD_CUSTOMER, {
    refetchQueries: [{ query: GET_CUSTOMERS }]
  });
  console.log(data);

  return (
    <div id="customerForm">
      <h3>ADD HUMAN</h3>
      <Formik
        initialValues={{
          FirstName: "",
          SecondName: "",
          LastName: "",
          Email: ""
        }}
        validationSchema={Yup.object().shape({
          FirstName: Yup.string().required("First Name is required"),
          SecondName: Yup.string().required("Second Name is required"),
          LastName: Yup.string().required("Last Name is required"),
          Email: Yup.string()
            .email("Email is invalidd")
            .required("Email is required")
        })}
        onSubmit={(fields, { resetForm }) => {
          addCustomer({
            variables: {
              ...fields,
              FullName: `${fields.FirstName}  ${fields.SecondName}  ${fields.LastName}`
            }
          });
          resetForm();
        }}
        render={({ errors, status, touched }) => (
          <Form>
            <Field
              label="First Name"
              name="FirstName"
              type="text"
              component={TextField}
              margin="none"
              variant="outlined"
              fullWidth
            />
            <Field
              label="Second Name"
              name="SecondName"
              type="text"
              component={TextField}
              margin="normal"
              variant="outlined"
              fullWidth
            />
            <Field
              label="Last Name"
              name="LastName"
              type="text"
              component={TextField}
              margin="normal"
              variant="outlined"
              fullWidth
            />
            <Field
              label="Email"
              name="Email"
              type="text"
              component={TextField}
              margin="normal"
              variant="outlined"
              fullWidth
            />
            <Button type="submit" variant="outlined" color="primary">
              Register
            </Button>{" "}
            <Button type="reset" variant="outlined" color="secondary">
              Reset
            </Button>
          </Form>
        )}
      ></Formik>
    </div>
  );
}

List of Humans - customers.js

Import our Packages

import React from "react";
import gql from "graphql-tag";
import { useQuery } from "@apollo/react-hooks";
import { Card } from "@material-ui/core";

We define the model of our Query

export const GET_CUSTOMERS = gql`
  {
    Customers {
      ID
      FullName
      SecondName
      LastName
      FirstName
    }
  }
`;

Define our copoment

export function Customers() {
  const { loading, error, data } = useQuery(GET_CUSTOMERS, {
    // pollInterval: 5000, //Call Function eache 5 seconds
  });

  if (loading) return <p>Loading...</p>;
  if (error) return <p style={{ color: "red" }}> Error! ${error.message}`</p>;
  return (
    <div id="viewCustomers">
      <h5>LIST OF HUMANS</h5>
      {data.Customers.map((p, i) => (
        <Card
          key={i}
          style={{ padding: "10px", margin: "5px" }}
        >{`${p.FirstName}  ${p.SecondName} ${p.LastName}`}</Card>
      ))}
    </div>
  );
}