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formValueSelector(form:String, [getFormState:Function]) #

View source on GitHub

formValueSelector is a "selector" API to make it easier to connect() to form values. It creates a selector function that accepts field names and returns corresponding values from the named form.

Importing #

var formValueSelector = require('redux-form').formValueSelector // ES5

import { formValueSelector } from 'redux-form' // ES6

Parameters #

form : String [required] #

The name of the form you are connecting to. Must be the same as the form config value you gave to reduxForm().

getFormState : Function [optional] #

If you are using the getFormState() config parameter to keep the redux-form reducer at a place in your Redux store other than state.form, you must also provide the same function here to get the slice of Redux store where the redux-form reducer is mounted. Defaults to state => state.form.

Selector #

The function returned from formValueSelector() has the following structure:

selector(state:Object, ...field:String) #

state : Object [required] #

The global Redux state given to mapStateToProps.

...field : String [required] #

The field, or fields, you want to select. If you provide only one field name, the function will return the value of that field. If you provide more than one field name, it will return an object mapping fields to values. If your field is "deep" (i.e. has one or more . in the name), the structure you get back will also be deep. e.g. If your fields are 'a.b' and 'a.c', the resulting structure will be { a: { b: 'bValue', c: 'cValue' } }.

Usage #

The first thing you do is create a selector for your form name.

const selector = formValueSelector('myFormName')

Then, there are several ways to use the selector that was created.

1. Select fields individually #

connect(state => ({
  firstValue: selector(state, 'first'),
  secondValue: selector(state, 'second')

2. Select multiple fields as a group into a grouped prop #

connect(state => ({
  myValues: selector(state, 'first', 'second')

3. Use the selector as mapStateToProps #

If you don't need any other props from the state, the selector itself works just fine as mapStateToProps if you are selecting multiple fields.

connect(state => selector(state, 'first', 'second'))(MyFormComponent)

Example #

See the Selecting Form Values example.