Problem with invalid defaultValue or value in FormItem ANTD

Question

I tried using the following code but the fields are not bound. onChange attribute works fine

const { getFieldDecorator, getFieldError, isFieldTouched } = this.props.form;
const NameError = isFieldTouched("Name") && getFieldError("Name");

<FormItem validateStatus={NameError ? "error" : ""} help={NameError || ""}>
  {getFieldDecorator("Name", {
    //initialValue: this.state.Data.Name,
    rules: [{ required: true, message: "Please input the component name!" }]
  })(
    <Input
      className="form-control"
      type="text"
      name="Name"
      defaultValue={this.state.Data.Name}
      onChange={this.onChange}
    />
  )}
</FormItem>

Am I missing something? I even used input instead of Input

Edit In the componentDidMount method, I get the data from the API:

fetch('http://localhost:5728/Fields/get/' this.state.Data.Id)
          .then(results=>{
            return results.json()
          })
          .then(data=>{

            this.setState({
                Data: {
                    Id: data.field.Id,
                    Name: data.field.Name,
                    Description: data.field.Description,
                    Value: data.field.Value
                }
              })

          })

I tried using initialValue but that only works if the state value is set in the constructor method. Changes are not reflected when calling the API.

Answer 1

You can also use hooks

import { Form } from "antd"

const [form] = Form.useForm();

 fetch('api')
      .then(results=>{
        return results.json()
      })
      .then(data=>{
        form.setFieldsValue({
           sample: data.dataYouWant
        });


<Form form = {form}>
   <Form.Item name = "sample">
       <Input />
   </Form.Item>
</Form>

Answer 2

The documentation states:

When data is loaded from the backend, just call setFieldsValue:

fetch('http://localhost:5728/Fields/get/' + this.state.Data.Id)
      .then(results=>{
        return results.json()
      })
      .then(data=>{

        this.props.form.setFieldsValue({
                Id: data.field.Id,
                Name: data.field.Name,
                Description: data.field.Description,
                Value: data.field.Value
          })
      })

Or more succinctly, if the backend's data.field exactly matches the field name:

this.props.form.setFieldsValue(data.field)