Backbone.js wrapper div and how to render partial html in a View

I want to render partial bootstrap dropdown menu in backbone. The menu looks like:

<ul class="dropdown-menu" role="menu" arial-labelledby="dLabel">
    <li id="loading" role="presentation"><a role="menuitem" tabindex="-1" href="#">Loading...</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#logout">Logout</a></li>

Loading tag will be replaced with UserMenuView, which render method is:

render: function() {
    var html = this.tpl(this.model.toJSON());
    return this;

And the underscore template:

<% for (var i=0;i<menu.length;i++) { %>
  <li role="presentation"><a role="menuitem" tabindex="-1" href="<%= menu[i].href %>"><%= menu[i].text %></a></li>
<% } %>
<% if (menu.length>0) { %>
  <li role="presentation" class="divider"></li>
<% } %>

Also the model data:

var data = {menu:[
    {href:'#', text:'Action 1'}
    , {href:'#', text:'Action 2'}

The problem is after rendered, there will has a div wrapper for li, which breaks bootstrap styles.

On stackoverflow there is a simlar question: Backbone.js turning off wrap by div in render.

So I use setElement.

But that didn't work for me.

So I had to read the Backbone.js source code and debug for the reason.

Let's see the source code of setElement:

setElement: function(element, delegate) {
    if (this.$el) this.undelegateEvents();
    this.$el = element instanceof Backbone.$ ? element : Backbone.$(element);
    this.el = this.$el[0];
    if (delegate !== false) this.delegateEvents();
    return this;

The problem is here: this.$el[0], when you have more than one html tag element in your template, only first one will be rendered.

So I hacked it with one dirty line, finally my worked code:

render: function() {
    var html = this.tpl(this.model.toJSON());
    this.el = html; // I don't care binding events.
    return this;