@using LeafWeb.WebCms.Controllers
@model int
@{
    var url = UmbracoContext.Current.UrlProvider.GetUrl(LeafWebPageIds.Chart);
    var disabled = ViewData.ContainsKey("Disabled") && (bool) ViewData["Disabled"];
    var xs = ViewData.ContainsKey("xs") && (bool) ViewData["xs"];
}
<a href="@url?leafInputId=@Model"
   class="btn btn-default @{if (xs) {<text>btn-xs</text>}} @{if (disabled) {<text>disabled</text>}}"
   role="button"
   @{if (disabled) {<text>title="No chart has been generated"</text>}} /> 
    <span class="glyphicon glyphicon-stats"></span>
    Chart
</a>