如何使用jQuery将类添加到所有li但不添加到单击的li

Question

I want to add a hidden class to all li but not to the li which was clicked. How can I do this using jQuery?

<ul class="render-menu">        
  <li class="font-size">list 1</li>
  <li class="font-size">list 2</li>
  <li class="font-size">list 3</li>
  <li class="font-size">list 4</li>
</ul>

jQuery(".render_menu li").on('click', function() { 
  alert();
  jQuery(".render_menu").not($(this)).parent().addClass('hidden');
});

Answer 1

Firstly note that your class in the HTML is render-menu , yet the JS was using render_menu . You need to make them consistent.

With regard to the issue, you're adding the class to the parent() of the li , ie. the ul , so all the child elements are being affected by the class. To fix this, use siblings() to get all the li elements you require before calling addClass() . Try this:

 $(".render-menu li").on('click', function() { $(this).siblings().addClass('hidden'); }); 

 .hidden { display: none; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <ul class="render-menu"> <li class="font-size">list 1</li> <li class="font-size">list 2</li> <li class="font-size">list 3</li> <li class="font-size">list 4</li> </ul> 

Answer 2

Change your JS code to below

jQuery(".render_menu li").on('click', function () {
            alert();

            jQuery(".render_menu li").not($(this)).addClass('hidden');

        });

You are comparing ul instead of li to add class

Answer 3

You can try the following

 $('.render-menu li').on('click',function(){ $('.render-menu li').removeClass('hidden').not(this).addClass('hidden'); }); 

 .hidden{ color:lightgray; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <ul class="render-menu"> <li class="font-size">list 1</li> <li class="font-size">list 2</li> <li class="font-size">list 3</li> <li class="font-size">list 4</li> </ul>