How to implement a 3 level dropdown with optgroup in yii?

Question

I need a drop down like following using yii.

Main

---Main-sub1

----- main-sub-sub1

----- main-sub-sub2

------- main-sub-sub-sub1

---Main-sub2

---Main-sub3

........

In this, all levels must be selectable because I may add more sub levels to any main category if needed at any time. So main categories also must be selectable.

Please help!

Answer 1

Select2 with yii is the best known solution. So far it works only for 2 levels. In the given link you might find also a 2 dimentional optgroup setting.

If you need a 3-level selection, then use two level select2 and a dependent dropdown for a 3rd level.

Update

Use Yii TreeView functionality then.