更改引导面板的图标

Question

I make a one faq script in PHP I want to change the icon when I open the panel and close the panel.I have tried these code but not get success.So what is the error in my code?

<div class="col-md-9 col-lg-9 col-sm-12 ">  
                        <?php  $v1 = ''; foreach($var as $data){ ?>

                            <div class="faqHeader" id="<?php echo  str_replace(' ','',$data['name']);?>"> <?php echo $data['name'];?> </div>                

                            <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
                                <?php   foreach($data['data'] as $dat){ ?> 
                                    <div class="panel panel-default">
                                        <div class="panel-heading" role="tab" id="headingOne">
                                            <h4 class="panel-title">
                                                <a role="button" data-toggle="collapse"  href="#col<?php
                                                echo $v1;?>" aria-expanded="true" aria-controls="col<?php
                                                echo $v1;?>">
                                                    <span class="glyphicon glyphicon-minus pull-right"></span>
                                                    <?php echo $dat['questions'];?>
                                                </a>
                                            </h4>
                                        </div>
                                        <div id="col<?php echo $v1;?>" class="panel-collapse collapse"  role="tabpanel" aria-labelledby="headingOne">
                                            <div class="panel-body">
                                                <?php echo $dat['answer'];?>
                                            </div>
                                        </div>
                                    </div>
                               <?php $v1=$v1+1; } ?>
                            </div>
                        <?php } ?>  
                </div>


<script>
$('.collapse').on('shown.bs.collapse', function(){
$(this).parent().find(".glyphicon-plus").removeClass("glyphicon-plus").addClass("glyphicon-minus");
}).on('hidden.bs.collapse', function(){
$(this).parent().find(".glyphicon-minus").removeClass("glyphicon-minus").addClass("glyphicon-plus");
});

</script>

Please help me?

Answer 1

Try this

css solution

.panel-heading [data-toggle="collapse"].collapsed:after{
    content: "+";
    float: right;
}
.panel-heading [data-toggle="collapse"]:after {
    content: "-";
    float: right;
}

 .panel-heading [data-toggle="collapse"].collapsed:after{ content: "+"; float: right; } .panel-heading [data-toggle="collapse"]:after { content: "-"; float: right; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> <div class="container"> <div class="panel-group" id="accordion"> <div class="panel panel-default"> <div class="panel-heading"> <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion" href="#aaa"> aaa </a> </h4> </div> <div id="aaa" class="panel-collapse collapse in"> <div class="panel-body"> aaa<br> aaa </div> </div> </div> <!-- .panel --> <div class="panel panel-default"> <div class="panel-heading"> <h4 class="panel-title"> <a class="collapsed" data-toggle="collapse" data-parent="#accordion" href="#bbb"> bbb </a> </h4> </div> <div id="bbb" class="panel-collapse collapse"> <div class="panel-body"> bbb<br> bbb </div> </div> </div> </div> </div> 

---

Js solution

$("#accordion, #bs-collapse").on("show.bs.collapse",function(a){ 
    $(a.target).prev('.panel-heading').addClass('active'); 
});
$("#accordion, #bs-collapse").on('hide.bs.collapse',function(a){ 
    $(a.target).prev('.panel-heading').removeClass('active');
});

  $("#accordion, #bs-collapse").on("show.bs.collapse",function(a){ $(a.target).prev('.panel-heading').addClass('active'); }); $("#accordion, #bs-collapse").on('hide.bs.collapse',function(a){ $(a.target).prev('.panel-heading').removeClass('active'); }); 

 .panel-heading a:after { content: "+"; float: right; } .panel-heading.active a:after { content: "-"; float: right; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> <div class="container"> <div class="panel-group" id="accordion"> <div class="panel panel-default"> <div class="panel-heading active"> <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion" href="#aaa"> aaa </a> </h4> </div> <div id="aaa" class="panel-collapse collapse in"> <div class="panel-body"> aaa<br> aaa </div> </div> </div> <!-- .panel --> <div class="panel panel-default"> <div class="panel-heading"> <h4 class="panel-title"> <a class="collapsed" data-toggle="collapse" data-parent="#accordion" href="#bbb"> bbb </a> </h4> </div> <div id="bbb" class="panel-collapse collapse"> <div class="panel-body"> bbb<br> bbb </div> </div> </div> </div> </div>