i change my function to this :
$(".panel-group").on ("shown.bs.collapse hidden.bs.collapse",
>> function(e) {
>
> var $t = $(e.target);
>
> var heading = $t.parents().siblings().find('*.panel-heading
>> span');
>
> heading.each(function(o) {
>
> $(o.target).removeClass('chevron-down').addClass('grey
>> chevron-right');
>
> });
>
> $t.hasClass('in') ? heading.addClass('chevron-right
>> grey').removeClass('chevron-down') : heading.removeClass('grey
>> chevron-right').addClass('chevron-down');
>
> });
>
>
It's not work like i want some help please
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