Guys finally i found Solution as Follows and working Great!!
Controller
def stagemilestone
@milestones=Milestone.find(:all, :conditions => ["status_id=? and project_id=?",params[:stageid], params[:id]])
respond_to do |format|
format.html # index.html.erb
format.json { render :json => @milestones}
end
end
and My char.js looks like this
$.ajax({
type : 'get',
url : "/projects/stagemilestone",
data : "stageid=" + $(this).attr('name') + "&id=" + $.cookie('projectid'),
dataType : 'json',
async : false,
context : document.body,
success : function(response) {
}
});
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