Call an event on Bootstrap panel expand

Question

I am working on a flow where we are using Bootstrap styled accordion (NOT jQuery UI accordion). The requirement is to call a service when the user expands the accordion. Here's the HTML:

<div class="accordion-dashboard">
    <div class="panel-group" id="accordion">
        <div class="panel panel-default">
            <div class="panel-heading  row-white" data-toggle="collapse" data-parent="#accordion" href="#runtimeValue">                 
                <table>
                    <tr>
                        <td><span class="badge blue">A</span></td>
                        <td><strong>Aenean ultricies est lorem,id feugiat velit euismod ut.Nullam inia.Prasent vel nu Sed ante mauris, eu lacus..</strong></td>
                        <td><i class="icon8 icon-paperclip"></i></td>
                        <td><span class="time">5 mins</span></td>
                    </tr>                    
                </table>                        
            </div>
            <div id="runtimeValue" class="panel-collapse collapse ">
                <div class="panel-body">

                    <div class="row">
                        <div class="col-lg-9 col-lg-offset-1">
                            <table>
                                <tr>
                                    <td class="text-muted">By</td>
                                    <td><img width="24px" src="images/company-logo.png"> Company Admin</td>
                                </tr>
                                <tr>
                                    <td class="text-muted">On</td>
                                    <td class="text-muted">Friday- 7 Aug 2014, 9.00PM</td>
                                </tr>
                                <tr>
                                    <td><i class="icon8 icon-paperclip"></i></td>
                                    <td>dummyfile.pdf</td>
                                </tr>
                                <tr>
                                    <td colspan="2">
                                        <h5>Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid.</h5>
                                        <p>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.</p>
                                    </td>
                                </tr>
                            </table>
                        </div>
                        <div class="col-lg-1 pull-right">
                            <span data-toggle="collapse" data-parent="#accordion" href="#collapseOne" class="btn-close icon8"></span>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>    
</div>

HREF attribute and the correspoding id attributes will be decided at runtime and I am aware of the pattern of them. One approach could be binding an event on click of the accordion, but I want to have it as a last resort.

Is there any other way I can call a service when the user clicks and expands the accordion?

Answer 1

According to the Bootstrap source (admittedly for the most current version, 3.3.0), there should be a shown.bs.collapse event emitted once the transition is complete. You can hook into that.

EDIT (July 2024): The event still exists in the source. You can see it emitted here and defined a few lines above, with the same name, so this event should still be safe to use.