You should add event to any parent element of li.bibeintrag.
$('ul').on('click', "li.bibeintrag", function(){
alert('myattribute=" + $(this).attr("myattribute'));
});
You should add event to any parent element of li.bibeintrag.
$('ul').on('click', "li.bibeintrag", function(){
alert('myattribute=" + $(this).attr("myattribute'));
});