React JS: Pass event inside onChange drop down (Ant Design)

I found a solution. Just use: onSelect(), passing the value and the event.

handleOnChange = (value, event) => {
        ...code here        
}

    render() {
        render(
           <Form>
              <Select onSelect={(value, event) => this.handleOnChange(value, event)}>

                      <Option value="1">text 1</Option>
                      <Option value="2">text 2</Option>
              </Select>
           </Form>
        )
    }

The Select component that you use is the one that handle the onChange and call your "outer" function.

What you can try is use the synthetic event variable inside your function, it might work:

handleOnChange = (selectedValue) => {
    console.log(selectedValue); // The value from the inner component
    console.log(event); // usually you have access to this variable
}