不能折叠所有手风琴项目

Question

How can I always have an item with .show? I mean, they can't collapse all

 <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous"> <div class="accordion" id="accordionExample"> <div class="card"> <div class="card-header" id="headingOne"> <h2 class="mb-0"> <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne"> Collapsible Group Item #1 </button> </h2> </div> <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample"> <div class="card-body"> Anim pariatur </div> </div> </div> <div class="card"> <div class="card-header" id="headingTwo"> <h2 class="mb-0"> <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"> Collapsible Group Item #2 </button> </h2> </div> <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample"> <div class="card-body"> Anim </div> </div> </div> </div> <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>

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Answer 1

You can remove the data-toggle from the button and data-parent from the info div

 <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous"> <div class="accordion" id="accordionExample"> <div class="card"> <div class="card-header" id="headingOne"> <h2 class="mb-0"> <button class="btn btn-link" type="button" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne"> Collapsible Group Item #1 </button> </h2> </div> <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" > <div class="card-body"> Anim pariatur </div> </div> </div> <div class="card"> <div class="card-header" id="headingTwo"> <h2 class="mb-0"> <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"> Collapsible Group Item #2 </button> </h2> </div> <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample"> <div class="card-body"> Anim </div> </div> </div> </div> <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>

Answer 2

You can use this snippet:

$(document).ready(function(){
    $('#accordionExample').on('hidden.bs.collapse', function(e){
    if($('#accordionExample').find('.show').length==0)
        $('#accordionExample').find('#collapseOne').collapse('show');
    })
})

Explanation:

You listen to the event that indicates that one of the items has been hidden ( hidden.bs.collapse ). Once this happens, you check if there are other items with the class .show which will indicate that there's anoter item opened. If this is not the case, you open the first one.

You can check it working here: https://jsfiddle.net/jfsan/xntr1gL3/