AngularJs 的ng-switch-when怎么拿到同一頁面js的值

 <script>
    var url = location.search;
    var dagl=url.substring(1,2);//這里的dagl是2
</script>

<div id="nav-wrapper" >

    <ul id="nav"  ng-controller="NavCtrl" collapse-nav highlight-active>
        <li ng-switch-when="dagl">//這里怎么能取到上面的2
            <a>
                <div style="background-image: url(../style/img/home/icon_menu.png);width: 25px;height: 25px;margin-right: 20px;float: left" width="23px" height="23px"></div><span>檔案管理</span>
            </a>
            <ul >
                <li><a ui-sref="ybpay/zfToYbSettle"><span>測試1</span><i class="fa fa-angle-right"></i></a>
                </li>
                <li><a ui-sref="ybpay/zfToYbSettleList"><span>測試1</span><i class="fa fa-angle-right"></i></a>
                </li>
            </ul>
        </li>
        \
        
        
        
        ## 如上圖描述，請大神解答 ##