Bootstrap 3 折叠 - 只折叠一个面板

Question

我需要有一个折叠面板，它允许一次只折叠一个面板。但是我的折叠允许同时打开多个面板。

我不知道我做错了什么。 这是我的代码：

<div class="col-lg-8 col-md-12 col-sm-12 col-xs-12">
<div class="panel-group" id="h-promocje" role="tablist" aria-multiselectable="true" style="">
<?php foreach ($promocje as $key => $promocja) { ?>
    <div class="panel-default">
        <a class="accordion-toggle collapsed" role="button" style="text-decoration:none !important;" data-toggle="collapse" data-parent="#h-promocje" href="#promocja<?=$key?>" aria-expanded="true" aria-controls="promocja<?=$key?>">
            <div class="panel-heading" role="tab" id="h-promocja<?=$key?>" style="border-bottom: 1px solid white;padding-left: 0;padding-right: 0;">
                <h4 class="panel-title" style="color:white;font-size:18px;font-weight:bold;text-transform: uppercase;padding-top: 4px; padding-bottom: 3px;text-align: left;">
                    <?=$promocja->tytul?>
                </h4>
            </div>
        </a>
        <div id="promocja<?=$key?>" class="panel-collapse collapse" role="tabpanel" aria-labelledby="promocja<?=$key?>">
            <div class="panel-body">
                <?=$promocja->opis?>
            </div>
        </div>
    </div>
<?php } ?>
</div>

Answer 1

您正在使用 Bootstrap。而且Bootstrap的折叠需要在可折叠结构中声明.panel类并在结构中使用data-parent=""属性，否则它不能像手风琴一样工作。 您还没有添加面板类，添加面板默认类。

.container-full {
  width: 90%!important;
  /* for demo */
  margin: 0 auto;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

<div class="container-full">
  <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
    <div class="panel panel-default">
      <div class="panel-heading" role="tab" id="headingOne">
        <h4 class="panel-title">
        <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
          Collapsible Group Item #1
        </a>
      </h4>
      </div>
      <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
        <div class="panel-body">
          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird
          on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table,
          raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
        </div>
      </div>
    </div>
    <div class="panel panel-default">
      <div class="panel-heading" role="tab" id="headingTwo">
        <h4 class="panel-title">
        <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
          Collapsible Group Item #2
        </a>
      </h4>
      </div>
      <div id="collapseTwo" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo">
        <div class="panel-body">
          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird
          on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table,
          raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
        </div>
      </div>
    </div>
    <div class="panel panel-default">
      <div class="panel-heading" role="tab" id="headingThree">
        <h4 class="panel-title">
        <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
          Collapsible Group Item #3
        </a>
      </h4>
      </div>
      <div id="collapseThree" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree">
        <div class="panel-body">
          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird
          on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table,
          raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
        </div>
      </div>
    </div>
  </div>
</div>

这是来自 Bootstrap 网站的实时示例。尝试删除面板类。