 <% if @project%>
$('#principals_for_new_member').html('<%= escape_javascript(render_principals_for_new_members(@project)) %>');
 <% elsif @course%>
 $('#principals_for_new_member').html('<%= escape_javascript(render_principals_for_new_course_members(@course)) %>');
 <%end%>
 var collection=$("#principals_for_new_member").children("#principals").children("label");
 collection.css("text-overflow","ellipsis");
 collection.css("white-space","nowrap");
 collection.css("width","200px");
 collection.css("overflow","hidden");
 for(i=0;i<collection.length;i++){    //增加悬浮显示
     var label=collection[i];
     var text=$(label).text();
     $(label).attr("title",text);
 }