Is there any way to trigger compact up for a gridster item?

[xiaoyuxu1010]

Hello, team.

I'm implementing a feature that drawing some charts in one dashboard. Now we need to collapse or expand each chart. Now I have achieved to expand one chart and to push down other charts under it, but when collapse one chart the other charts under it cannot compact up automatically. So could you please give some advise? Thanks in advance.

When expand the first chart, it works good to push down the second one as below screen shot:

When collapse the first chart, the second one cannot compact up automatically:

By the way, I am using angular 1.5.x to implement the feature. And here is the code fragment: