select 的 optgroup_html/css_WEB-ITnose

?son1
option>
                                                      son2
 


I have done the grouping.
But there is a requirement that ---parent1--- ---parent2--- as the parent class must also be selected.
How is this achieved? ?

Reply to the discussion (solution)
There is no way, you can only write div to imitate select

No way

control is dead. I can only see the grouping effect and cannot select

. Then I can only use other methods.