Question

我遵循以下代码：

import React from 'react';
import { Formik, Form, Field, FieldArray } from 'formik';

// Here is an example of a form with an editable list.
// Next to each input are buttons for insert and remove.
// If the list is empty, there is a button to add an item.
export const FriendList = () => (
  <div>
    <h1>Friend List</h1>
    <Formik
      initialValues={{ friends: ['jared', 'ian', 'brent'] }}
      onSubmit={values =>
        setTimeout(() => {
          alert(JSON.stringify(values, null, 2));
        }, 500)
      }
      render={({ values }) => (
        <Form>
          <FieldArray
            name="friends"
            render={arrayHelpers => (
              <div>
                {values.friends && values.friends.length > 0 ? (
                  values.friends.map((friend, index) => (
                    <div key={index}>
                      <Field name={`friends.${index}`} />
                      <button
                        type="button"
                        onClick={() => arrayHelpers.remove(index)} // remove a friend from the list
                      >
                        -
                      </button>
                      <button
                        type="button"
                        onClick={() => arrayHelpers.insert(index, '')} // insert an empty string at a position
                      >
                        +
                      </button>
                    </div>
                  ))
                ) : (
                  <button type="button" onClick={() => arrayHelpers.push('')}>
                    {/* show this when user has removed all friends from the list */}
                    Add a friend
                  </button>
                )}
                <div>
                  <button type="submit">Submit</button>
                </div>
              </div>
            )}
          />
        </Form>
      )}
    />
  </div>
);

但是用于文本输入字段。我想替换为select，然后执行类似的操作。

替换：

<Field name={`issues.${index}`} />

收件人：

<Field component="select" name="color">
  <option value="red">Red</option>
  <option value="green">Green</option>
  <option value="blue">Blue</option>
</Field>

在一个组件中选择值时，我会添加3个组件，这对所有组件都有效。

我在这里错了什么？

Answer 1

每个name输入的select属性必须是唯一的。尝试以下

<Field component="select" name={`friends.${index}`}>
   <option value="red">Red</option>
   <option value="green">Green</option>
   <option value="blue">Blue</option>
</Field>

如何在Formik中将选择字段添加到FieldArray

1 个答案: