在引导面板中添加加号/减号

Question

考虑jQuery代码的以下sn-p

function toggleIcon(e) {
   $(e.target)
   .prev('.panel-heading')
   .find(".more-less")
   .toggleClass('glyphicon-plus glyphicon-minus');
}
$('.panel-group').on('hidden.bs.collapse', toggleIcon);
$('.panel-group').on('shown.bs.collapse', toggleIcon);

上面的代码在$(document).ready(function(){});里面

标记看起来像：

   <div class="panel-group" id="collapse">
    <div class="panel panel-primary">
        <div class="panel-heading">
            <h4 class="panel-title"><a data-parent="#collapse" data-toggle="collapse" href="#collapse-one"><i class="more-less glyphicon glyphicon-plus"></i> Item Details
            <span class="badge pull-right" id="itemdetails">0</span></a></h4>
        </div>
        <div class="panel-collapse collapse in" id="collapse-one">
            <div class="panel-body">
                @for (int i = 0; i < Model.MyList.Count; i++) {
                <div class="panel panel-info">
                    <div class="panel-heading">
                        <h4 class="panel-title"><a data-toggle="collapse"
                        href="#@Model.MyList[i].Number"><i class="more-less glyphicon glyphicon-plus">@Model.MyList[i].Number, @Model.MyList[i].PropA, @Model.MyList[i].PropB</i></a></h4>
                    </div>
                    <div class="panel-collapse collapse" id="@Model.MyList[i].Number">
                        <div class="panel-body"></div>
                    </div>
                </div>
            </div>
        </div>
        }
    </div>
</div>

这适用于除第一个面板之外的每个面板。第一个面板将始终打开，而不是添加一个加号，而是添加一个减号。第一个面板有 panel-collapse collapse in 类，它确保面板在页面加载时打开。

请注意，我有嵌套面板，这也适用于这些面板，它只是第一个给我带来问题的面板

谁能告诉我我做错了什么。

Answer 1

我已经试过了请参考下面的代码：

HTML：

<div class="panel-group" id="accordion">

  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title">
        <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">
           Collapsible Group Item #2 
        </a><i class="indicator glyphicon glyphicon glyphicon-plus  pull-right"></i>
      </h4>
    </div>
    <div id="collapseTwo" class="panel-collapse collapse">
      <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">
      <h4 class="panel-title">
        <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
          Collapsible Group Item #3 
        </a><i class="indicator glyphicon glyphicon glyphicon-plus pull-right"></i>
      </h4>
    </div>
    <div id="collapseThree" class="panel-collapse collapse">
      <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>

JavaScript 代码：

$('#accordion').on('hidden.bs.collapse', function () {
    //do something...
})
$('#accordion .accordion-toggle').click(function (e) {
    var chevState = $(e.target).siblings("i.indicator").toggleClass('glyphicon-minus glyphicon-plus');
    $("i.indicator").not(chevState).removeClass("glyphicon-minus").addClass("glyphicon-plus");
});

请参考此fiddle link 进行演示。