我如何在这个元素中添加 class 或 id 只知道有多个元素包含“.side-sections .widget”

Question

var b = ('data-type');

if ($(b + ":contains('cover')")) {
  $(".sided-sections .widget").addClass("cate-cover")
}

i want repair this code please because when I add this code it adds a class to all elements that contain " .sided-sections .widget " so I want to dedicate something to that where the class adds on data-type='cover' only and thank you

Answer 1

A jQuery selector doesn't return a true/false value that can be used in .match() . If you want to know if a selector finds anything, you need to get its length.

Furthermore, if doesn't set this to the elements that the selector matches. If you want to set this , you need to use .each() to loop over all the matching elements.

$(b + ":contains('cover')").each(function() {
    $(this).siblings(".sided-sections .widget").addClass("cate-cover");
});

But you don't even need that, because you can apply .siblings() directly to the selector:

$(b + ":contains('cover')").siblings(".sided-sections .widget").addClass("cate-cover");

If this doesn't work, add the HTML to your question, and point out which elements should get the cate-cover class. You might have the relationships between the selectors wrong.