Using async setState

Question

I have function which dispatched an action. I would like to display a loader before and after the action. I know that react composing the object passed to setState

Answer 1

Wrap the rest of your code in the callback of the first setState:

handleChange(input) {
  this.setState({
    load: true
  }, () => {
    this.props.actions.getItemsFromThirtParty(input)
    this.setState({ load: false })
  })
}

With this, your load is guaranteed to be set to true before getItemsFromThirtParty is called and the load is set back to false.

This assumes your getItemsFromThirtParty function is synchronous. If it isn't, turn it into a promise and then call the final setState within a chained then() method:

handleChange(input) {
  this.setState({
    load: true
  }, () => {
    this.props.actions.getItemsFromThirtParty(input)
      .then(() => {
        this.setState({ load: false })
      })
  })
}