D3 data table query

问题

I want to create an expandable table. Suppose I have following records in table:

Sr.No   Type
1   Planets
1.1 Mercury
1.2 Earth
1.3 Venus
2   Colors
2.1 Yellow
2.2 Green

Default view should be :
Sr.No   Type
1       Planets
2       Colors

and when one clicks on Planet row, it should expand as:

Sr.No   Type
1   Planets
1.1 Mercury
1.2 Earth
1.3 Venus
2   Colors

and on clicking once again it should rollback to original state.

Kindly guide me or point me to some reference. Also,if this is not possible, is there anything close to this possible in d3. Thanks.

来源：https://stackoverflow.com/questions/23831411/d3-data-table-query