salut,
je suis un débutant en javascript et je voudrais passer le paramètres 'in' à la classe 'class=collaspe' de 'id=demo1' avec du javasrcipt pour rendre le sous repertoire active,pour ne pas écrire dans mon code HTMl..merci de vouloir m'aidé.

voici mon code html:

Code html : Sélectionner tout - Visualiser dans une fenêtre à part
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<!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]><script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script><script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script><![endif]-->
<!-- Bootstrap CSS-->
<link rel="stylesheet" href="app/css/bootstrap.css">
 
<link rel="stylesheet" href="app/css/bootstrap-theme.css">
<style>
 
    .panelHo{
        border: 0px solid black;
 
    }
 
    .titre{
        font-size: 14px;
        font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
    }
    .listeLien{
        width: 113%;
        float: left;
        margin-left: -15px;
        height: auto;
        border:0px;
    }
 
 
    .panel-body{
        background-color:#FFF;
    }
 
    .panelNavig {
        border: none;
        background-color: #ffffff;
        box-shadow: 0 0 3px #dadada;
        -webkit-box-shadow: 0 0 3px #dadada;
        -moz-box-shadow: 0 0 3px #dadada;
        border-radius: 4px;
        position: relative;
        margin-bottom: 20px;
        border-color: #ddd;
        font-family: 'Open Sans', sans-serif;
    }
 
    .panel .panelLien {
        font-size: 13px;
        font-weight: bold;
        font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
        color: #555555;
        background-color: white;
        border: none;
        padding: 10px;
        border-radius: 4px;
    }
    .panelLien a{
        color:#555555;
        border-bottom: 1px solid transparent;
    }
    .listeLien{
        padding: 6px 15px;
        border: none;
        font-size: 12px;
 
    }
    .liens{
        border: none;
    }
 
    .lien{
        color:#555;
        font-size: 12px;
        font-weight: 600;
        text-decoration: none;
    }
    .lienss{
        color: white;
        background-color: #2d6ca2;
    }
    a.lienss:hover, a.lienss.active, a.lienss.active:hover, a.lienss.active:focus {
        z-index: 2;
        color: white;
        background-color: #2d6ca2;
 
    }
    a.liens:hover, a.liens.active, a.liens.active:hover, a.liens.active:focus {
        z-index: 2;
        color: #555555;
        background-color: #f7f7f7;
        border-left: 3px solid #384EC2 !important;
    }
    a.list-group-item-success {
        color: white;
    }
    .list-group.panel > .list-group-item {
        border-bottom-right-radius: 4px;
        border-bottom-left-radius: 4px;
        border:none;
    }
</style>
 
<div id="MainMenu">
    <div class="list-group panel panel-primary">
        <a href="#demo1" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Dashboard</a>
        <div class="collapse in" id="demo1">
            <a href="dashboard.html" class="list-group-item liens"><i class="fa fa-cogs "></i>&nbsp;<span class="lien">Dashboard</span></a>
        </div>
 
        <a href="#demo2" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Users Management</a>
        <div class="collapse" id="demo2">
            <a href="usersdashboard.html" class="list-group-item liens"><i class="fa fa-cogs "></i>&nbsp;<span>Users Dashboard</span></a>
            <a href="user-section-management.html" class="list-group-item liens"><i class="fa fa-cogs "></i>&nbsp;<span>Section Management</span></a>
            <a href="users-view.html" class="list-group-item liens"><i class="fa fa-list-ol "></i>&nbsp;<span>Users Views</span></a>
        </div>
 
        <a href="#demo3" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Event Management</a>
        <div class="collapse" id="demo3">
            <a href="events-dashboard.html" class="list-group-item liens"><i class="fa fa-cogs "></i>&nbsp;<span>Event Dashboard</span></a>
            <a href="events-view.html" class="list-group-item liens"><i class="fa fa-list-ol "></i>&nbsp;<span>Event Views</span></a>
            <a href="create-event.html" class="list-group-item liens"><i class="fa fa-magic "></i>&nbsp;<span>Create Event</span></a>
        </div>
 
        <a href="#demo4" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Messages Management</a>
        <div class="collapse" id="demo4">
            <a href="messages-dashboard.html" class="list-group-item liens"><i class="fa fa-cogs "></i>&nbsp;<span>Message Dashboard</span></a>
            <a href="messages-view.html" class="list-group-item liens"><i class="fa fa-edit "></i>&nbsp;<span>View & Edit Message</span></a>
        </div>
        <a href="#demo5" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Events Templates Management</a>
        <div class="collapse" id="demo5">
            <a href="events-tpltes-view.html" class="list-group-item liens"><i class="fa fa-list-ol "></i>&nbsp;<span>Templates Views</span></a>
        </div>
        <a href="#demo6" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Linkage Management</a>
        <div class="collapse" id="demo6">
 
        </div>
        <a href="#demo7" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Advertisement Management</a>
        <div class="collapse" id="demo7">
            <a href="ads-dashboard.html" class="list-group-item liens"><i class="fa fa-cogs">&nbsp;</i><span>Advertisement Dashboard</span></a>
            <a href="regionDefine.html" class="list-group-item liens"><i class="fa fa-cog">&nbsp;</i><span>Region Management</span></a>
            <a href="AdvertisementRegion.html" class="list-group-item liens"><i class="fa fa-list-ol">&nbsp;</i><span>Ads list per Region</span></a>
            <a href="AdvertisementCountry.html" class="list-group-item liens"><i class="fa fa-list-ol">&nbsp;</i><span>Ads list per Country</span></a>
            <a href="AdvertisementEvent.html" class="list-group-item liens"><i class="fa fa-list-ol">&nbsp;</i><span>Ads list per Event</span></a>
            <a href="FrameAdds.html" class="list-group-item liens"><i class="fa fa-wrench"></i>&nbsp;<span></i>Time Frame of Ads Setting</span></a>
            <a href="DatePaymentFiltration.html" class="list-group-item liens"><i class="fa fa-wrench"></i>&nbsp;<span>Filtration Payment date setting</span></a>
        </div>
        <a href="#demo8" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Shop Management</a>
        <div class="collapse" id="demo8">
            <a href="shop-link.html" class="list-group-item liens"><i class="fa fa-external-link"></i>&nbsp;<span class="">Shop link</span></a>
            <a href="order-list.html" class="list-group-item liens"><i class="fa fa-list-ol"></i>&nbsp;<span class="lien">Order list</span></a>
        </div>
        <a href="#demo9" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Ressource Confirmation Queue</a>
        <div class="collapse" id="demo9">
            <a href="RessourceConf.html" class="list-group-item liens"><i class="fa fa-check"></i>&nbsp;<span class="lien">Unconfirmed resouces list</span></a>
        </div>
        <a href="#demo10" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Newsletter</a>
        <div class="collapse" id="demo10">
            <a href="RessourceConf.html" class="list-group-item liens"><i class="fa fa-cog"></i><span class="lien">Newsletter Management</span></a>
            <a href="send-message.html" class="list-group-item liens"><i class="fa fa-share"></i><span class="lien">Send Message</span></a>
 
        </div>
        <a href="#demo11" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Contest Management</a>
        <div class="collapse" id="demo11">
            <a href="contest-create.html" class="list-group-item liens"><i class="fa fa-magic"></i><span class="lien">Create Contest</span></a>
            <a href="archive-past-contest.html" class="list-group-item liens"><i class="fa fa-folder"></i><span class="lien">Archive past contest</span></a>
 
        </div>
        <a href="#demo12" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Word Format Management</a>
        <div class="collapse" id="demo12">
 
        </div>
        <a href="#demo13" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Bad Word Control</a>
        <div class="collapse" id="demo13">
            <a href="bad-w-management.html" class="list-group-item liens"><i class="fa fa-cog"></i><span class="lien">Badwords Management</span></a>
 
        </div>
        <a href="#demo14" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Sites Options</a>
        <div class="collapse" id="demo14">
            <a href="new-users-notification.html" class="list-group-item liens"><i class="fa fa-cog"></i><span class="lien">Email notification to new users</span></a>
            <a href="bad-w-list.html" class="list-group-item liens"><i class="fa fa-list-ol"></i><span class="lien">Badwords List</span></a>
            <a href="resource-limitation.html" class="list-group-item"><i class="fa fa-list-ol"></i> <span class="lien">Resource limitation</span></a>
        </div>
        <a href="#demo15" class="list-group-item list-group-item-success lienss" data-toggle="collapse" data-parent="#MainMenu">Statistics</a>
        <div class="collapse" id="demo15">
            <a href="statistic.html" class="list-group-item liens"><i class="fa fa-cog"></i><span class="lien">Users statistics</span></a>
        </div>
 
        <!--##########################################################################################################-->
    </div>
</div>
<script src="vendor/jquery/js/jquery.min.js"></script>
<script src="vendor/bootstrap/js/bootstrap.min.js"></script>