jquery - Bootstrap-select does not toggle "open" class -

please refer to ->

I downloaded from source, I really do not know why Not to toggle the "open-toggle" to "open" category. I can fix this by adding some messy scripts, but I like the plugin to do the right thing.

HTML:

  & lt; Div class = "number customdp" & gt; & Lt; Select class = "simple-dropdown" name = "number" & gt; & Lt; Options & gt; 1 & lt; / Options & gt; & Lt; Options & gt; 2 & lt; / Options & gt; & Lt; Options & gt; 3 & lt; / Options & gt; & Lt; Options & gt; 4 & lt; / Options & gt; & Lt; Options & gt; 5 & ​​lt; / Options & gt; & Lt; / Select & gt;  

Is anyone's solution?

There is dependency on Twitter Bootstrap. Include files such as your and javascript :