Retrieving value from <select> with multiple option in React

Answer 1

The same way you do anywhere else, since you're working with the real DOM node as the target of the change event:

handleChange: function(e) {
  var options = e.target.options;
  var value = [];
  for (var i = 0, l = options.length; i < l; i++) {
    if (options[i].selected) {
      value.push(options[i].value);
    }
  }
  this.props.someCallback(value);
}