pjax单击事件两次触发

how can i fix this problem with pjax, when i have toggle event to fadein and fadeout, and when i click on that element it fadein then fadeout, on one click ?

pjax call:

$.pjax.defaults.timeout = 3000;
$(document).pjax('a', '#main_wrapper');

click event:

$('body').on('click', '.element_class', function() {
    ...
});

Check here: link Click on "Calendar" link at top header(to load page with pjax), then click on "+" for filter..

This is happening with pjax and wiselinks.