树形菜单怎么初始化加载的时候全部展开

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树形菜单怎么初始化加载的时候全部展开10

下面的这个方法是页面刚刚加载的时候,调用的函数
function resetTree(grade, subject, parId) {
$("#pointTree")
.tree(
{
width : 500,
url : "/action/exampoint/tree/initPoint?grade=" + grade
+ "&subject=" + subject + "&parId=" + parId,
onBeforeExpand : function(node) {
$("#pointTree").tree("options").url = "/action/exampoint/tree/initPoint?grade="
+ grade
+ "&subject="
+ subject
+ "&parId="
+ node.id;
},

onLoadSuccess : function(node, data) {
if(grade==-1&&subject==-1&&parId==-1)
return;
if (data == null || data == "")
$.messager
.alert("系统提示", "暂无匹配考点训练!", "warning");
}
});
}

后台action对应的方法:
public String initPoint() {
List<Map<String, Object>> root = new ArrayList<Map<String, Object>>();

List<EduExampoint> points = knowledgeManage
.findBySubjectAndGradeAndParId(subject, grade, parId);

for (int i = 0; i < points.size(); i++) {
System.out.println("point==========="+points.get(i));
System.out.println(points.size());
}
for (EduExampoint point : points) {
Map<String, Object> item = new HashMap<String, Object>();
item.put("id", point.getId());
// root
if (point.getParId() == 0)
item.put("text", point.getEduGrade() + " "
+ point.getEduSubject().getName());
else
item.put("text", point.getName());

/* int childCount=knowledgeManage.getExamPointChildCount(point.getId());
if (childCount > 0)
item.put("state", "closed");
root.add(item);*/
String countHql = "select count(p.id) from EduExampoint p where p.deleteFlag='true'";
countHql += " and p.parId=" + point.getId();
countHql += grade != null && grade != -1 ? " and p.eduGrade.id="
+ grade
: "";
countHql += subject != null && subject != -1 ? " and p.eduSubject.id="
+ subject
: "";
System.out.println("countHql====="+countHql);
List<Object> rs = knowledgeManage.findByHql(countHql);
int c = 0;
if (!rs.isEmpty()) {
c = Integer.parseInt(rs.get(0).toString());
}
item.put("state", c < 1 ? "open" : "closed");
root.add(item);

}
for (int i = 0; i < root.size(); i++) {
System.out.println("root.get(i)====="+root.get(i));
}
try {
response.getWriter().print(JSONArray.fromObject(root));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

目前就是初始化加载的时候显示的是图片1的效果,但是现在用户要实现的是页面加载的时候,全部显示树形菜单的所有的结构.就是页面加载的时候要显示的是图片2的效果,有什么好的办法啊,求大神们解决!

树形菜单