load a handlebars template via ajax then use it as a backbone view

ajaxBackboneHandlebars.js

$.ajax({
  url: 'ui/tpl/login.handlebars',
	context: this,
	cache: true,
	success: function(data) {
		var tpl = Handlebars.compile(data);
		this.$el.html(tpl(this.model.toJSON()));
	}
});