在折叠菜单中使用双箭头

I want to use double arrows (on left side and right side) in a collapse menu but I couldn't.

我想在折叠菜单中使用双箭头（在左侧和右侧），但我不能。

You can find a collapse menu example here: http://bootsnipp.com/snippets/b47p2

您可以在此处找到折叠菜单示例：http：//bootsnipp.com/snippets/b47p2

The example I want on https://sedo.com/us/'s "HOW IT WORKS" section.

我想在https://sedo.com/us/的“如何工作”部分中提供的示例。

I tried to solve sedo's codes but I couldn't merge. As much as I understand, they use

我试图解决sedo的代码，但我无法合并。据我所知，他们使用

_transform: rotate(135deg);_ 

to make double arrow.

制作双箭头。

The Codes want to change:

代码想要改变：

HTML:

HTML：

<div class="container">
    <div class="row">
        <div class="col-md-8" id="main">
            <h3>Doesn't it look better ?</h3>
            <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">
                      Why is it better
                    </a>
                  </h4>
                </div>
                <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
                  <div class="panel-body">
                  <ul>
                      <li>The titles are block, so you don't have to click the text part to activate it</li>
                      <li>Indicators for expand / collapsing items</li>
                      <li>Removed title links' obnoxious :hover  underlinings, and outlines.</li>
                  </ul>
                </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>

            <hr />

            <h3>Compared to default</h3>

            <div class="panel-group" id="accordion_reg" role="tablist" aria-multiselectable="true">
              <div class="panel panel-default">
                <div class="panel-heading" role="tab" id="headingOne_reg">
                  <h4 class="panel-title">
                    <a role="button" data-toggle="collapse" data-parent="#accordion_reg" href="#collapseOne_reg" aria-expanded="true" aria-controls="collapseOne_reg">
                     Collapsible Group Item #1
                    </a>
                  </h4>
                </div>
                <div id="collapseOne_reg" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne_reg">
                  <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_reg">
                  <h4 class="panel-title">
                    <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion_reg" href="#collapseTwo_reg" aria-expanded="false" aria-controls="collapseTwo_reg">
                      Collapsible Group Item #2
                    </a>
                  </h4>
                </div>
                <div id="collapseTwo_reg" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo_reg">
                  <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_reg">
                  <h4 class="panel-title">
                    <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion_reg" href="#collapseThree_reg" aria-expanded="false" aria-controls="collapseThree_reg">
                      Collapsible Group Item #3
                    </a>
                  </h4>
                </div>
                <div id="collapseThree_reg" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree_reg">
                  <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>
        <div class="sidebar col-md-4" id="sideright">
            <h3>Sidebar</h3>
            <p class="well">Some sidebar content</p>
        </div>
    </div>
<div>

CSS:

CSS：

#accordion .panel-heading { padding: 0;}
#accordion .panel-title > a {
    display: block;
    padding: 0.4em 0.6em;
    outline: none;
    font-weight:bold;
    text-decoration: none;
}

#accordion .panel-title > a.accordion-toggle::before, #accordion a[data-toggle="collapse"]::before  {
    content:"\e113";
    float: left;
    font-family: 'Glyphicons Halflings';
    margin-right :1em;
}
#accordion .panel-title > a.accordion-toggle.collapsed::before, #accordion a.collapsed[data-toggle="collapse"]::before  {
    content:"\e114";
}

Thank you very much..

非常感谢你..

1 个解决方案

#1

change your css to next

把你的CSS改成下一个

#accordion .panel-heading { 
    padding: 0;
    position: relative;
}
#accordion .panel-title > a {
    display: block;
    padding: 0.4em 2em;
    outline: none;
    font-weight:bold;
    text-decoration: none;
}

#accordion .panel-title > a.accordion-toggle::before, #accordion a[data-toggle="collapse"]::before,
#accordion .panel-title > a.accordion-toggle::after, #accordion a[data-toggle="collapse"]::after{
    content:"\e113";
    position: absolute;
    font-family: 'Glyphicons Halflings';
    top: 0.5em;

}
#accordion .panel-title > a.accordion-toggle.collapsed::before, #accordion a.collapsed[data-toggle="collapse"]::before,
#accordion .panel-title > a.accordion-toggle.collapsed::after, #accordion a.collapsed[data-toggle="collapse"]::after{
    content:"\e114";
}
#accordion .panel-title > a.accordion-toggle::before, #accordion a[data-toggle="collapse"]::before,
#accordion .panel-title > a.accordion-toggle.collapsed::before, #accordion a.collapsed[data-toggle="collapse"]::before {
    left: 0.5em;
}
#accordion .panel-title > a.accordion-toggle.collapsed::after, #accordion a.collapsed[data-toggle="collapse"]::after,
#accordion .panel-title > a.accordion-toggle::after, #accordion a[data-toggle="collapse"]::after{
    right: 0.5em;
}