React.js having state based on other state

Question

I\'m running into some problems with React.js and the state not being immediately set when calling setState(). I\'m not sure if there are better ways to approach this, or if it

Answer 1

Unsure if this was the case when question was asked, though now the second parameter of this.setState(stateChangeObject, callback) takes an optional callback function, so can do this:

setAlarmTime: function(time) {
  this.setState({ alarmTime: time }, this.checkAlarm);
},
checkAlarm: function() {
  this.setState({
    alarmSet: this.state.alarmTime > 0 && this.state.elapsedTime < this.state.alarmTime
  });
}, ...