如何在jQuery中删除带有异常的类

Question

i have a little jQuery case. So, i want to remove all of block classes but with little exception - if this div/block have some classes every of them will be deleated but one specify not. I'v try something like this but it's not work.

$('#rounded_items').removeClass(function(){
    $('#rounded_items').not.getElementsByClassName('small_menu');
}).addClass('main_menu');

Can you help me?

Answer 1

It's a little unclear what exactly you're trying to do, but my best guess would be something like this:

$('#rounded_items:not(.small_menu)').removeClass().addClass('main_menu');

... which will replace all class names with just main_menu to all items with ID rounded_items (!!!) except those with class small_menu .

Do take note that IDs should be unique . Can't stress that enough. So it doesn't make sense to select by ID and expect multiple elements so that you can filter by class further.

Answer 2

ID's should be unique, so all you have to do is check that the single element you are targeting does not have the class before you remove the classes :

var isSmall = $('#rounded_items').is('.small_menu');
$('#rounded_items').attr('class', isSmall ? 'main_menu' : '');

Answer 3

Can't you just check if the object has this class which should not be removed. If it has it - remove all classes and add the needed class. Something like this:

if ($("#item").hasClass("neededClass")){
   $("#item").removeClass();
   $("#item").addClass("neededClass");
}

I'm not sure if this is what you want to do.

Answer 4

Use following code

$('#rounded_items').removeClass(function(){
     var el = $('.small_menu');
    $('#rounded_items').not(el);
}).addClass('main_menu');