Clear a field's value on input clear in react-

问题:

I'm using a custom component with react-final-form. On input change it sets the value to the address field. But when the input is cleared it doesn't update the value of the field. So I'm trying to do it with form mutators.

I have already added a mutator for clearing the field:

mutators={{
  clear: ([address], state, { changeValue }) => {
    changeValue(state, "address", () => undefined);
  }
}}

I tried to add it to my custom onChange function, but it doesn't work.

onChange={event =>
  props.input.onChange !== undefined
    ? props.input.onChange({ value: event })
    : form.mutators.clear
}

Or maybe this can be done without mutators at all? I would really appreciate your help. Here is a live example (clearing the field works only on the button click as onClick={form.mutators.clear}).

回答1:

You can just call form.change('address', undefined) at any time that you'd like to clear the value.

回答2:

All the default callback are handle by the component. If you want to do a clear with a button click, you can create a custom component and use native callback methods do your thing.

onChange = (event) => {
  this.setState({
    address:event.target.value
  });
}

onClear = () => {
  this.setState({
    address:''
  });
}

<div>
  <Field name="address">
      <div>
        <input
          value={this.state.address}
          onChange={this.onChange}
        />
      </div>
  </Field>
  <button onClick={this.onClear}>Clear</button>
</div>

回答3:

The problem is not with the react-final-form in your code, it is due to the react-da data, I have played a lot around your code within 1 day, and checked reset is working with fine with the react-final-form

Just update your render with this code and see reset is working absolutely fine. Yeah! the problem is with react da data. I am not sure about what it does due to less official information for this package.

 <div className="App">
      <h2>Dadata test</h2>
      <Form
        mutators={{
          clear: ([address], state, { changeValue }) => {
            changeValue(state, "address", () => undefined);
          }
        }}
        onSubmit={onSubmit}
        render={({ form, handleSubmit, pristine, invalid, values, errors }) => (
          <form onSubmit={handleSubmit} noValidate>
            <Field name="address" component="input" />
              {/* {props => (
                <div>
                  <ReactDadata
                    token="d19c6d0b94e64b21d8168f9659f64f7b8c1acd1f"
                    onChange={event =>
                      props.input.onChange !== undefined
                        ? props.input.onChange({ value: event })
                        : form.mutators.clear
                    }
                  />
                </div>
              )}
            </Field> */}
            <button type="submit" disabled={invalid}>
              Submit
            </button>
            <button type="button" onClick={form.reset}>
              Clear
            </button>
            <Fields names={["address"]}>
              {fieldsState => (
                <pre>{JSON.stringify(fieldsState, undefined, 2)}</pre>
              )}
            </Fields>
          </form>
        )}
      />
    </div>

Hope it will help you to resolve the problem.