See web2py.js 
There is :
$(ul).find(":text").after('<a href="#">+</a>&nbsp;<a href="#">-</a>').
keypress(function(e) {
            return(e.which == 13) ? pe(ul, e) : true;
          }).next().click(function(e) {
            pe(ul, e);
            e.preventDefault();
          }).next().click(function(e) {
            rl(ul, e);
            e.preventDefault();
          }); 


you can overwrite it as you want




On Tuesday, March 15, 2016 at 10:11:10 PM UTC+3, Pierre wrote:
>
> ok..... l see the list:string class  : class ListWidget(StringWidget)
> what i'd like to do is keep the default design and sqlform structure 
> associated to list:string fields but to have my own javascript to manage a 
> few things
>
> in particular the use of Jquery on() or Jquery delegate() to watch the + 
> and -  buttons clicks events generates conflicts
>
> how do I proceed ?
>
>
>
>

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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