Q: I am making an sqlform widget with jquery sortable, to change the order of a list

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Hi, I am making an sqlform widget that can change the order of a list, for example, if I have a field with value

xx = [a,b,c], 

user can interact with this ui to make it 

xx = [c, a, b].

To achieve this, I need to post a list. If I use SELECT, it is easy, but you cannot change the order of SELECT value. 

I googled, and found out that if you have multiple post values, they are treated as a list. For example, 

DIV(

HIDDEN(_value= 'a', _name='xx'), 

HIDDEN(_value= 'b', _name='xx'), 

HIDDEN(_value= 'c', _name='xx')) will post xx=[a,b,c], and

DIV(

HIDDEN(_value= 'c', _name='xx'), 

HIDDEN(_value= 'a', _name='xx'), 

HIDDEN(_value= 'b', _name='xx')) will post xx=[c,a,b].

The problem happens when SQLFORM accepts the form. I saw that xx=[c,a,b] is posted, and found in request.post_vars and request.vars, but it disappears after SQLHTML.accepts() is executed. I narrowed down, and found that HTML._traverse() function for some reason does not think this is a value.

So I am stuck.

Any idea?