Building a collapsible toggle feature with an SVG icon using HTML and CSS

I am trying to swap a FontAwesome Icon with a Google Materials SVG Icon when a collapsible table button toggle is pressed (changing from a down arrow to an up arrow). I have been struggling to get the Google Material Icons code to work. How can I resolve this issue?

The desired functionality should be similar to this, but using Google icons:

https://codepen.io/tofanelli/pen/waadRY

Font Awesome

.card-header .accordion-toggle:after {
    font-family: 'Glyphicons Halflings';
    content: "\e114"; 
    float: right; 
    color: grey; 
}

.card-header .accordion-toggle.collapsed:after {
    content: "\e113";
}

Google Material Icons:

.card-header .accordion-toggle:after .material-icons{
    content: "\e5cf"; 
    float: right; 
    color: grey; 
}

etc

Here is an example image of the button toggling:

https://i.stack.imgur.com/SQlUO.png

javascripthtmlcsstwitter-bootstrapmaterial-ui

Answer №1

To start, ensure you have the Google web font included in your project

<link href="https://fonts.googleapis.com/icon?family=Material+Icons"
      rel="stylesheet">

In the CSS styling for the toggle buttons, make sure to update

font-family: 'Glyphicons Halflings';

to

font-family: 'Material Icons';

and replace

content: "\e114";

with either

content: "expand_less";

or

content: "expand_more";

For example:

.panel-heading .accordion-toggle:after {
  font-family: 'Material Icons';
  content: "expand_less";
  float: right;
  color: grey;
}

.panel-heading .accordion-toggle.collapsed:after {
  font-family: 'Material Icons';
  content:"expand_more";
}
<!-- Latest compiled and minified Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<div class="container">


  <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="#collapseOne">
          Collapsible Group Item #1
        </a>
        </h4>
      </div>
      <div id="collapseOne" class="panel-collapse collapse in">
        <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 collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">
          Collapsible Group Item #2
        </a>
        </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 collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
          Collapsible Group Item #3
        </a>
        </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>


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

<!-- Latest compiled and minified JavaScript -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

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