引导 4：在前循环中将一个图标与另一个图标交换的最佳方式是什么？

Question

我想在使用折叠时交换，在使用foreach循环时没有每个图标同时切换。fa fa-plusfa fa-minus这是我的代码演示。<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" /><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" /><script src="https://code.jquery.com/jquery-3.4.1.slim.min.js"></script><script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script><script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script><div class="container h-100">    <div class="row no-gutters border-0 rounded align-items-center mt-3">        <div class="col-sm-4">demo 1</div>        <div class="col-sm-4">demo 1</div>        <div class="col-sm-3">demo 1</div>        <div class="col-sm-1 ">            <a class="fa fa-plus" data-toggle="collapse" href="#collapse1" aria-expanded="true" aria-controls="collapse1"></a>        </div>    </div><!--row-->    <div class="collapse" id="collapse1">        <div class="row no-gutters border-0 rounded align-items-center mt-3">            <div class="col-sm-4">demo 1</div>            <div class="col-sm-4">demo 1</div>            <div class="col-sm-4">demo 1</div>        </div><!--collapse-->    </div>    <div class="row no-gutters border-0 rounded align-items-center mt-3">        <div class="col-sm-4">demo 2</div>        <div class="col-sm-4">demo 2</div>        <div class="col-sm-3">demo 2</div>        <div class="col-sm-1 ">            <a class="fa fa-plus" data-toggle="collapse" href="#collapse2" aria-expanded="true" aria-controls="collapse2"></a>        </div>    </div><!--row-->https://codepen.io/benwhittaker25/pen/rNVWyby在引导 4.4 中实现此目的的最佳方法是什么？

Answer 1

您可以在单击按钮时使用事件 Bootstrap 触发器来执行此操作：

$('.collapse').on('show.bs.collapse hide.bs.collapse', function () {

  // Find the corresponding button

  var $btn = $('[data-toggle="collapse"][href="#' + this.id + '"]');

  // Find the corresponding row

  var $row = $btn.closest('.row');

  

  // Toggle classes

  $btn.toggleClass('fa-minus fa-plus');

  $row.toggleClass('rounded rounded-top');

});

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" />

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" />

<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js"></script>

<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>

<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>

<div class="container h-100">

    <div class="row no-gutters border-0 rounded align-items-center mt-3">

        <div class="col-sm-4">demo 1</div>

        <div class="col-sm-4">demo 1</div>

        <div class="col-sm-3">demo 1</div>

        <div class="col-sm-1 ">

            <a class="fa fa-plus" data-toggle="collapse" href="#collapse1" aria-expanded="true" aria-controls="collapse1"></a>

        </div>

    </div><!--row-->

    <div class="collapse" id="collapse1">

        <div class="row no-gutters border-0 rounded align-items-center mt-3">

            <div class="col-sm-4">demo 1</div>

            <div class="col-sm-4">demo 1</div>

            <div class="col-sm-4">demo 1</div>

        </div><!--collapse-->

    </div>

    <div class="row no-gutters border-0 rounded align-items-center mt-3">

        <div class="col-sm-4">demo 2</div>

        <div class="col-sm-4">demo 2</div>

        <div class="col-sm-3">demo 2</div>

        <div class="col-sm-1 ">

            <a class="fa fa-plus" data-toggle="collapse" href="#collapse2" aria-expanded="true" aria-controls="collapse2"></a>

        </div>

    </div><!--row-->

    <div class="collapse" id="collapse2">

        <div class="row no-gutters border-0 rounded align-items-center mt-3">

            <div class="col-sm-4">demo 2</div>

            <div class="col-sm-4">demo 2</div>

            <div class="col-sm-4">demo 2</div>

        </div><!--collapse-->

    </div>

    <div class="row no-gutters border-0 rounded align-items-center mt-3">

        <div class="col-sm-4">demo 3</div>

        <div class="col-sm-4">demo 3</div>

        <div class="col-sm-3">demo 3</div>

        <div class="col-sm-1 ">

            <a class="fa fa-plus" data-toggle="collapse" href="#collapse3" aria-expanded="true" aria-controls="collapse3"></a>

        </div>

    </div><!--row-->

    <div class="collapse" id="collapse3">

        <div class="row no-gutters border-0 rounded align-items-center mt-3">

            <div class="col-sm-4">demo 3</div>

            <div class="col-sm-4">demo 3</div>

            <div class="col-sm-4">demo 3</div>

        </div><!--collapse-->

    </div>

</div><!--container-->

Answer 2

优雅的方法是做blex所展示的jquery方式。但是你也可以绑定一个点击函数，就像下面的javascript方式一样：

function toggleClass(item){

    if(item.classList.contains('fa-plus')){

            item.classList.remove('fa-plus');

            item.classList.add('fa-minus');

    }else{

        item.classList.remove('fa-minus');

            item.classList.add('fa-plus');

    }

}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" />

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" />

<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js"></script>

<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>

<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>

<div class="container h-100">

<div class="container h-100">

    <div class="row no-gutters border-0 rounded align-items-center mt-3">

        <div class="col-sm-4">demo 1</div>

        <div class="col-sm-4">demo 1</div>

        <div class="col-sm-3">demo 1</div>

        <div class="col-sm-1 ">

            <a class="fa fa-plus" data-toggle="collapse" href="#collapse1" aria-expanded="true" aria-controls="collapse1" onClick="toggleClass(this)"></a>

        </div>

    </div><!--row-->

    <div class="collapse" id="collapse1">

        <div class="row no-gutters border-0 rounded align-items-center mt-3">

            <div class="col-sm-4">demo 1</div>

            <div class="col-sm-4">demo 1</div>

            <div class="col-sm-4">demo 1</div>

        </div><!--collapse-->

    </div>

    <div class="row no-gutters border-0 rounded align-items-center mt-3">

        <div class="col-sm-4">demo 2</div>

        <div class="col-sm-4">demo 2</div>

        <div class="col-sm-3">demo 2</div>

        <div class="col-sm-1 ">

            <a class="fa fa-plus" data-toggle="collapse" href="#collapse2" aria-expanded="true" aria-controls="collapse2" onClick="toggleClass(this)"></a>

        </div>

    </div><!--row-->

    <div class="collapse" id="collapse2">

        <div class="row no-gutters border-0 rounded align-items-center mt-3">

            <div class="col-sm-4">demo 2</div>

            <div class="col-sm-4">demo 2</div>

            <div class="col-sm-4">demo 2</div>

        </div><!--collapse-->

    </div>

    <div class="row no-gutters border-0 rounded align-items-center mt-3">

        <div class="col-sm-4">demo 3</div>

        <div class="col-sm-4">demo 3</div>

        <div class="col-sm-3">demo 3</div>

        <div class="col-sm-1 ">

            <a class="fa fa-plus" data-toggle="collapse" href="#collapse3" aria-expanded="true" aria-controls="collapse3" onClick="toggleClass(this)"></a>

        </div>

    </div><!--row-->

    <div class="collapse" id="collapse3">

        <div class="row no-gutters border-0 rounded align-items-center mt-3" >

            <div class="col-sm-4">demo 3</div>

            <div class="col-sm-4">demo 3</div>

            <div class="col-sm-4">demo 3</div>

        </div><!--collapse-->

    </div>

</div><!--container-->