var transitionsSettingsClass = document.getElementsByClassName("transitionsSettings");
var transitionsSettingsClassLenght = transitionsSettingsClass.length;
for (i=0; i < transitionsSettingsClassLenght; i++);
{
    transitionsSettingsClass[i].setAttribute("data-transition",transitionsSettings);
};

for (i=0; i < transitionsSettingsClassLenght; i++);

$('.transitionsSettings').each(function(index) {
        $(this).setAttribute("data-transition",transitionsSettings);
    });

node.dataset.transition = transitionsSettings;