React formik 表单验证：如何最初禁用提交按钮

Question

Below is my React form validation code in which I am using formik . By default when the form loads, I want to keep the submit button disabled:

import { useFormik } from "formik";
import * as Yup from "yup";

const formik = useFormik({
    initialValues: {
      firstName: "",
      lastName: "",
      email: ""
    },
    validationSchema: Yup.object({
      firstName: Yup.string()
        .max(15, "Must be 15 characters or less")
        .min(3, "Must be at least 3 characters")
        .required("Required"),
      lastName: Yup.string()
        .min(3, "Must be at least 3 characters")
        .max(20, "Must be 20 characters or less")
        .required("Required"),
      email: Yup.string()
        .email("Invalid email address")
        .required("Required")
    }),
    onSubmit: values => {
      handleSubmit(values);
    }
  });

I have tried to use this on my button:

 disabled={!formik.isValid}

But it only actually works if I try to submit the form. So, if I leave the form blank and hit submit, all the validation errors show up and then the button is disabled. But, it should be disabled already from the start. I checked the documentation but didn't see anything obvious there.

Answer 1

If you want to keep the submit button disabled initially when the form loads, you can use the use the dirty : boolean property of Formik something as below:

disabled={!formik.dirty}

If you want to keep the submit button disabled until all the field values are valid then you can use isValid: boolean which works as below:

Returns true if there are no errors (ie the errors object is empty) and false otherwise.

So you may use it as:

disabled={!formik.isValid}

Now, if you want the submit button to be disabled until all the fields are valid and if the fields values have been changed from their initial values then you would have to use both of the above attributes in conjunction as below:

disabled={!(formik.isValid && formik.dirty)}

Answer 2

要最初禁用按钮，只需检查触摸对象是否为空并保持这种方式，直到所有字段都使用!isValid进行验证

disabled={!isValid || (Object.keys(touched).length === 0 && touched.constructor === Object)}

Answer 3

Formik keeps track of field values and errors however exposes them for your use, this used to be done via formProps using the render props pattern however now seems to be part of the formik variable returned by the useFormik hook.

I would recomend to start by removing the initial values to a constant. Then you need to access the formik's error object. I have not done this using the new hook syntax, however, looking at the docs I would expect "formik.errors" to work (this is exposed in formProps.errors using render props). Finally the submit buttion disabled should be a check that either formik.values is equal to the initial values OR the errors object is not empty.

Answer 4

You can add validateOnMount and set it to true

const formik = useFormik({
    initialValues: {
      validateOnMount: true, // <================= Add this
      firstName: "",
      lastName: "",
      email: ""
    },
    validationSchema: Yup.object({
      firstName: Yup.string()
        .max(15, "Must be 15 characters or less")
        .min(3, "Must be at least 3 characters")
        .required("Required"),
      lastName: Yup.string()
        .min(3, "Must be at least 3 characters")
        .max(20, "Must be 20 characters or less")
        .required("Required"),
      email: Yup.string()
        .email("Invalid email address")
        .required("Required")
    }),
    onSubmit: values => {
      handleSubmit(values);
    }
  });

Use on button

disabled={!formik.isValid}

Answer 5

I'm using

"formik": "^2.2.6"

and in my case I did it like this. I was not interested to show the messages in the validation messages in initial so I did in this way.

I'm using class based components

<Formik
......
validateOnBlur={true}
validateOnChange={true}

{({handleChange, values, touched, errors, handleBlur }) => (<>
    ..........
    <Form.Control
        placeholder="Name"
        type="text"
        name="field_dba"
        value={values.name}
        onChange={handleChange}
        onFocus={handleBlur} // It plays a role to change the touched property 
        isInvalid={touched.name && !!errors.name}
        isValid={!errors.name}
        className="form-input"
    />
    <label className="modal-lab">Name *</label>
    // Here i'm checking the field is touched or not 
    {touched.name ? <Form.Control.Feedback type="invalid" className="text-capitalize"> {errors.name} </Form.Control.Feedback> : null}

at the end for disabling the button till it's all validated. I'm using this

<button disabled={Array.isArray(errors) || Object.values(errors).toString() != ""} type="submit"> Submit </button>

If this will work with same version please do a upvote.