使用jQuery定位具有相同数据ID的姐妹/兄弟元素

Question

Hopefully this one doesn't go off the beaten track too much - but I was wondering what the quickest method is in jQuery for targeting another element (that is a close relative of $(this).whatever ) with the same data id attribute. I currently have the following markup (if you use the latest Bootstrap you'll notice that this is just a simple card with nav headings):

<div class="card text-center">
  <div class="card-header pb-0">
    <ul id="contactGroups" class="nav justify-content-center nav-tabs card-header-tabs">
      <li class="nav-item" data-id="1">
        <a class="nav-link active" href="#">Contact Us</a>
      </li>
      <li class="nav-item" data-id="2">
        <a class="nav-link" href="#">Business Enquiries</a>
      </li>
      <li class="nav-item" data-id="3">
        <a class="nav-link" href="#">Follow Us</a>
      </li>
    </ul>
  </div>
  <div class="card-body active" data-id="1">
    <h5 class="card-title">Special title treatment</h5>
    <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
    <a href="#" class="btn btn-primary">Go somewhere</a>
  </div>
  <div class="card-body hidden" data-id="2">
    <h5 class="card-title">Special title treatment</h5>
    <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
    <a href="#" class="btn btn-primary">Go somewhere</a>
  </div>
  <div class="card-body hidden" data-id="3">
    <h5 class="card-title">Special title treatment</h5>
    <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
    <a href="#" class="btn btn-primary">Go somewhere</a>
  </div>
</div>

As you can see in the above markup I have data-id attributes added to the list elements - I want to then go in and find it's corresponding data-id (the ones with the card-body active or card-body hidden) so I can begin to play with them. However (!!) I don't want to select on some arbitary #id or .class that I assign. How would I go about doing this?

My jQuery thus far is as follows (however, this only flips the current class from non-active (or no class) to the active class giving the tab swop illusion:

$('#contactGroups').each(function(){
  $(this).find('li').each(function(){
    $(this).on('click', function() {                
      $('#contactGroups').find('.active').removeClass('active');
      $(this).find('a').addClass('active');
    })
  });
});

Any thoughts would be greatly appreciated.

Answer 1

I can't quite make out whether you

1. Want to find the div with the same data-id as the li , or

2. Want to find other li s that are siblings ("brothers" + "sisters" = "siblings") of the li that was clicked which also have data-id attributes.

In the click handler on the li , this will refer to the li that was clicked (it or its descendant a element). With that in mind:

Assuming #1:

You can get the data-id of that element using attr :

var theId = `$(this).attr("data-id");

(Don't use data("id") unless you need the features data provides; more here .)

You can find elements within a given container using find , or siblings via siblings . So starting from the clicked li , you can either do .closest(".card-header").siblings(...) to access the header's siblings, or .closest(".card").find(...) to search all through the containing .card . The former is more specific, but more fragile; the latter is more robust if your structure changes a bit. Neither matters in terms of performance.

So I'd probably go up to .card and use find with a tag and attribute selector combination:

$(this).closest(".card").find("div[data-id='" + theId + "']")...

FWIW, there's no need to hook click on each individual li . Just use event delegation:

$("#contactGroups").on("click", "li[data-id]", function() {
    var theId = $(this).attr("data-id");
    var div = $(this).closest(".card").find("div[data-id='" + theId + "']");
    // ...
});

Assuming #2

Use $(this).siblings("[data-id]") in the li click handler to find all of its siblings with a data-id (with any value).

---

Full Working Example

...based on your comments:

 $("#contactGroups").on("click", "li[data-id]", function() { var theId = $(this).attr("data-id"); var div = $(this).closest(".card").find("div[data-id='" + theId + "']"); div.removeClass("hidden").addClass("active"); div.siblings("[data-id]").removeClass("active").addClass("hidden"); }); 

 .hidden { display: none; } .active { font-weight: bold; } 

 <div class="card text-center"> <div class="card-header pb-0"> <ul id="contactGroups" class="nav justify-content-center nav-tabs card-header-tabs"> <li class="nav-item" data-id="1"> <a class="nav-link active" href="#">Contact Us</a> </li> <li class="nav-item" data-id="2"> <a class="nav-link" href="#">Business Enquiries</a> </li> <li class="nav-item" data-id="3"> <a class="nav-link" href="#">Follow Us</a> </li> </ul> </div> <div class="card-body active" data-id="1"> <h5 class="card-title">(1) Special title treatment</h5> <p class="card-text">With supporting text below as a natural lead-in to additional content.</p> <a href="#" class="btn btn-primary">Go somewhere</a> </div> <div class="card-body hidden" data-id="2"> <h5 class="card-title">(2) Special title treatment</h5> <p class="card-text">With supporting text below as a natural lead-in to additional content.</p> <a href="#" class="btn btn-primary">Go somewhere</a> </div> <div class="card-body hidden" data-id="3"> <h5 class="card-title">(3) Special title treatment</h5> <p class="card-text">With supporting text below as a natural lead-in to additional content.</p> <a href="#" class="btn btn-primary">Go somewhere</a> </div> </div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 

Answer 2

• You don't need an each because you have only one contactGroups .
• Use the data function from jQuery.
• With closest function you can get the ancestor of li elements.
• Use toggleClass function to add or remove the class active .
• Use this selector $('div[data-id="${id}"]') to find the related li 's div .
• You can use this selector to bind the click event $('#contactGroups li').on('click'), ...);

 $('#contactGroups li').on('click', function() { $(this).closest('#contactGroups').find('.active').toggleClass('active'); $(this).children('a').toggleClass('active'); $('div.card-body.active').toggleClass('active'); let id = $(this).data('id'); $(`div[data-id="${id}"]`).toggleClass('active'); }); 

 .active { color: green !important; background-color: lightgreen; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div class="card text-center"> <div class="card-header pb-0"> <ul id="contactGroups" class="nav justify-content-center nav-tabs card-header-tabs"> <li class="nav-item" data-id="1"> <a class="nav-link active" href="#">Contact Us</a> </li> <li class="nav-item" data-id="2"> <a class="nav-link" href="#">Business Enquiries</a> </li> <li class="nav-item" data-id="3"> <a class="nav-link" href="#">Follow Us</a> </li> </ul> </div> <div class="card-body active" data-id="1"> <h5 class="card-title">Special title treatment</h5> <p class="card-text">With supporting text below as a natural lead-in to additional content.</p> <a href="#" class="btn btn-primary">Go somewhere</a> </div> <div class="card-body hidden" data-id="2"> <h5 class="card-title">Special title treatment</h5> <p class="card-text">With supporting text below as a natural lead-in to additional content.</p> <a href="#" class="btn btn-primary">Go somewhere</a> </div> <div class="card-body hidden" data-id="3"> <h5 class="card-title">Special title treatment</h5> <p class="card-text">With supporting text below as a natural lead-in to additional content.</p> <a href="#" class="btn btn-primary">Go somewhere</a> </div> </div>