javascript - why 'setTimeout' in 'bsTransitionend'? -

i going through code of carasoul.js , came across following line of code ::

settimeout(function () {             that.$element.trigger(slidevent)           }, 0) 

well simple above line of code doing , below line of code ::

that.$element.trigger(slidevent) 

is executed @ interval of 0 , question , context of piece of code , if author wanted run function/execute line of code , have done without settimeout , in case ,

instead of ::

settimeout(function () {             that.$element.trigger(slidevent)           }, 0) 

the author have written following lines of code ::

that.$element.trigger(slidevent)  

so why set time out , context ??

below entire snippet of code , makes more sense ::

$active         .one('bstransitionend', function () {            $next.removeclass([type, direction].join(' ')).addclass('active')           $active.removeclass(['active', direction].join(' '))           that.sliding = false             settimeout(function () {             that.$element.trigger(slidevent)           }, 0)         })  

the entire code can found on git here. (line 156).

to repeat question , why settimeout used when seems doing nothing ?

this done call function on next cycle. use when need wait dom refresh or other event dispatch in cycle.

you're adding function in settimeout queue , in next cycle when settimeout queue checked method executed because time (0) passed.

possible duplicate: why settimeout(fn, 0) useful?