How should unsubscribe be handled in a react compo

问题:

In my component I have the following:

componentWillMount: function () {
  this.unsubscribe = store.subscribe(function () {
    this.setState({message: store.getState().authentication.message});
  }.bind(this));
},

componentWillUnmount: function () {
  this.unsubscribe();
},

Not calling unsubscribe causes the following error:

Warning: setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component. This is a no-op.

What I'd like to know is should I be assigning unsubscribe to this or is there a better place to assign it?

回答1:

As mentioned by Salehen Rahman above in the comments I did end up using react-redux.

Following their documentation I created two functions, one to map the 'global state' to the props within the component:

function mapStateToProps(state) {
  return {
    users: state.users.items
  };
}

and one to map the dispatched actions to functions passed into the component as props:

function mapDispatchToProps(dispatch) {
  return {
    lockUser: (id) => dispatch(actions.lockUser(id)),
    unlockUser: (id) => dispatch(actions.unlockUser(id)),
    updateUser: (id, user) => dispatch(actions.updateUser(id, user)),
    addUser: (user) => dispatch(actions.addUser(user))
  };
}

This then all gets pulled together using the connect method:

export default connect(mapStateToProps, mapDispatchToProps)(UsersContainer);

I have a feeling that all this does under the hood is attach the unsubscribe method to the component but it does simplify things substantially.