Add a plus/minus sign to a jQuery menu

Question

I developed the following code for a simple menu:

$(document).ready(function () {
    $(".main_menu_01, .main_menu_02").on('click', function () {
    
    var $panel = $(this).next('.panel');
    if ($panel.is(':visible')) {
      $panel.add($panel.find('.panel')).slideUp(500).removeClass('active');
    } else {
      $panel.slideDown(500).addClass('active');
    }
    
    });
});

.panel{ 
 width: 100%;
 padding-left: 0%;
 font-weight: bold;
 overflow: hidden;
 display:none;
}

.main_menu_01 {
 padding-left: 1%;
 background: blue;
}

.main_menu_02 {
 padding-left: 5%;
 background: lime;
}

.sub_menu_01{
 padding-left: 1%;
 background: lime;
}

.sub_menu_02{
 padding-left: 10%;
 background: lime;
}


.main_menu_01:before, .main_menu_02:before {
 content:'+';
 width:20px;
 display:inline-block;
}

.main_menu_01.active:before, .main_menu_02.active:before {
 content:'-';
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<li class="main_menu_01"> 1.0 Main Menu </li>
  <ul class="panel">
        
    <li class="sub_menu_01"> 1.1 Sub Menu </li>
     
    <li class="main_menu_02"> 1.2 Sub Menu </li>
      <ul class="panel">
  
      <li class="sub_menu_02"> <a> 1.2.1 Sub Menu </a> </li>
      <li class="sub_menu_02"> <a> 1.2.2 Sub Menu </a> </li> 

      </ul> 
   
  </ul>

All this works fine so far. You can also find the code in the JSFiddle here.

---

As you can see I want to add a + and - sign to the main_menu buttons depending if the menu is opened or not. Therefore, I tried to go with the before code in the CSS. However, currently the + sign remains although the menu is opened.

I am not sure if this issue might be caused by the jQuery code. However, I need this jQuery code to close/open the entire menu in case the button main_menue_01 is clicked.

Do you have any idea what I need to change in my code so I can have the full function provided by the jQuery code and a +/- sign?

Answer 1

You need to set the active class on the banner, i.e. where the click happens. From there you can change the style with respect to state, e.g.

$(document).ready(function () {
    $(".main_menu_01, .main_menu_02").on('click', function () {
      var $panel = $(this).next('.panel');
      if ($panel.is(':visible')) {
        $panel.add($panel.find('.panel')).slideUp(500);
        $(this).hasClass('main_menu_01') ? $('.menu').removeClass('active') : $(this).removeClass('active');
      } else {
        $panel.slideDown(500);
        $(this).addClass('active');
      }
    });
});

.panel{ 
 width: 100%;
 padding-left: 0%;
 font-weight: bold;
 overflow: hidden;
 display:none;
}

.main_menu_01 {
 padding-left: 1%;
 background: blue;
}

.main_menu_02 {
 padding-left: 5%;
 background: lime;
}

.sub_menu_01{
 padding-left: 1%;
 background: lime;
}

.sub_menu_02{
 padding-left: 10%;
 background: lime;
}

 .main_menu_01:before, .main_menu_02:before {
 content:'+';
 width:20px;
 display:inline-block;
}

.main_menu_01.active:before, .main_menu_02.active:before {
 content:'-';
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<li class="menu main_menu_01"> 1.0 Main Menu </li>
  <ul class="panel">
        
    <li class="sub_menu_01"> 1.1 Sub Menu </li>
     
    <li class="menu main_menu_02"> 1.2 Sub Menu </li>
      <ul class="panel">
        <li class="sub_menu_02"> <a> 1.2.1 Sub Menu </a> </li>
        <li class="sub_menu_02"> <a> 1.2.2 Sub Menu </a> </li> 
      </ul> 
  </ul>