React Native + Redux Form - Use keyboard next button to go to next TextInput field

问题

I'm using Redux Form (RF) in a React Native application. Everything works fine but I can not figure out how to get the refs from the Field input to go to the next input field with Redux Form.

Without RF this solution would work just fine.

Here is my code:

class RenderInput extends Component {
   const { input, nextField, refs,
        meta: { touched, error, warning },
        input: { onChange } } = this.props
   render() {
      return (
         <Input
            returnKeyType = {'next'}
            onChangeText={onChange}
            onBlur={input.onBlur}
            onFocus={input.onFocus}
            onSubmitEditing = {(event) => {
               // refs is undefined
               refs[nextField].focus()
            }}/>
      )
   }
}

class Form extends Component {
   render() {
      return (
         <Field
            name="field1"
            focus
            withRef
            ref='field1'
            nextField = "field2"
            component={RenderInput}/>

         <Field
            name="vendor"
            withRef
            ref="field2"
            nextAction = "field3"
            component={RenderInput}/>
      )
   }
}

I'm passing on the property nextField to the component to determine the next input field when the Next key on the keyboard is clicked but I can not get the refs property inside the RenderInput component.

Any idea how to get the refs property?

回答1:

This solution passes props from the Form component to the RenderInput component and passes a function call back.

Here's the code:

class RenderInput extends Component {
   const { input, refField, onEnter,
        meta: { touched, error, warning },
        input: { onChange } } = this.props
   render() {
      return (
         <TextInput
            ref = {refField}
            returnKeyType = {'next'}
            onChangeText={onChange}
            onBlur={input.onBlur}
            onFocus={input.onFocus}
            onSubmitEditing={onEnter}/>
      )
   }
}

class Form extends Component {
   render() {
      return (
         <Field
            name="field1"
            focus
            withRef
            ref={(componentRef) => this.field1 = componentRef}
            refField="field1"
            component={RenderInput}
            onEnter={() => { 
               this.field2.getRenderedComponent().refs.field2.focus()
            }}/>

         <Field
            name="field2"
            withRef
            ref={(componentRef) => this.field2 = componentRef}
            refField="field2"
            component={RenderInput}/>
      )
   }
} 

So what happened here?

1. I assign the ref to local scope with ref={(componentRef) => this.field1 = componentRef} as @Ksyqo suggested. Thanks for the hint.

2. I pass refField="field1" to the RenderInput and assign the value to the input ref property ref = {refField}. This will add the input object to the refs property.

3. I assigned a onEnter function in the Field

4. I pass the function to the props of RenderInput and assign it to the onSubmitEditing={onEnter} function. Now we have bind the two functions together. That means if onSubmitEditing gets invoked the onEnter function gets invoked as well

5. Finally, refer to the local field field2, get the rendered Component and use the refs, which we assigned in the Input field, to set the focus. this.field2.getRenderedComponent().refs.field2.focus()

I don't know if this is the most elegant solution but it works.

回答2:

For people who are using Redux Form + React Native Elements, just follow @Thomas Dittmar answer, and add the following prop to the 'FormInput' component: textInputRef={refField}

The newest version of React Native Element has added the focus() method, so you don't have to worry about that.

回答3:

withRef is deprecated, use forwardRef instead.

回答4:

I worked on getting a ref like this that worked for me.

           const renderComp = ({
             refName,
             meta: { touched, error },
             input,
             ...custom
           }) => (
             <MyComponent
               ref={refName}
               {...custom}
             />
           )

            <Field
              name={name}
              component={renderComp}
              ref={node =>
                isLeft ? (this.compRef1 = node) : (this.compRef2 = node)}
              refName={node =>
                 (this.myRef= node) }
              withRef
            />

now access instance functions like this.

this.myRef.anyFunc()

回答5:

I had a slightly different use case, but I imagine it works for the above as well.

I used the focus action

import { focus } from 'redux-form';
dispatch(focus('signIn', 'email'));

Then in the (custom) form field that contains the TextInput, I added in the render function

<TextInput
    ref="email"
/>
formStates.filter((state) => meta[state]).map((state) => {
   if(state === 'active'){
      this.refs.email.focus()
   }
})

No worries about the component nesting/hierarchy anymore.

来源：https://stackoverflow.com/questions/43917795/react-native-redux-form-use-keyboard-next-button-to-go-to-next-textinput-fie