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用ExtJS实现动态载入树

    博客分类:
  • Ext
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Oracle DDL脚本 :

create table  ORGANIZATION(

  ORGID       NUMBER(10) not null,

  PARENTID    NUMBER(10) not null,

  ORGNAME     VARCHAR2(32) not null,

  ISAVAILABLE NUMBER(1) default 1 not null

);

alter table  ORGANIZATION

       add constraint PK_ORGID primary key (ORGID);

alter table  ORGANIZATION

       add constraint FK_ORGID_PARENTID foreign key (PARENTID)

 references ORGANIZATION (ORGID);

初始化数据内容(注意第一行数据是必需的):

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (-100, -100, '组织机构图', 1);

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (1, -100, '公司总部1',  1);

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (2, -100, '公司总部2',  1);

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (3, -100, '公司总部3',  1);


insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (4, 1, '公司总部1-1',  1);

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (5, 1, '公司总部1-2',  1);

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (6, 2, '公司总部2-1',  1);

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (7, 2, '公司总部2-2',  1);

insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (8, 3, '公司总部3-1',  1);


insert into LOON_ORGANIZATION (ORGID, PARENTID, ORGNAME,  ISAVAILABLE) values (9, 3, '公司总部3-2',  1);

有了数据库支持就可以动态的从数据库中提取树数据。

第一步是建立JSP文件(org.jsp)和JavaScript(org.js)文件:

在org.jsp中导入ExtJS所必需的库文件,并在<body>中加入

<body>

<div id="tree-div" style="overflow:auto; height:300px;width:200px;border:2px solid #c3daf9;"></div>

</body>

Org.jsp文件完全可以是静态HTML文件,这里org.jsp中不包含任何动态内容,注意ExtJS所必需的库文件类库路径问题。

Org.js文件内容:

Ext.onReady(function() {

      var Tree = Ext.tree;

      var tree = new Tree.TreePanel( {

            el : 'tree-div',//目标div容器

            autoScroll : true,

            animate : true,


            enableDD : true,

            containerScroll : true,

            loader : new Tree.TreeLoader( {

                  dataUrl : ' OrgTreeJsonData.action '// OrgTreeJsonData.action就是要动态载入数据的请求地址,这里请求时会提交一个参数为node的值,值为root即new Tree.AsyncTreeNode()对象的id值

            })

      });

      var root = new Tree.AsyncTreeNode( {

            text : '组织机构树',

            draggable : false,

            id : '-100'//默认的node值:?node=-100

      });

      tree.setRootNode(root);

      tree.render();

      root.expand();

});

 

OrgTreeJsonData.action所请求的JSON数据例子:

 

[ {

      "text" : "公司总部1",

      "id" : "1",

      "cls" : "folder"


}, {

      "text" : "公司总部2",

      "id" : "2",

      "cls" : "folder"

}, {

      "text" : "公司总部3",

      "id" : "3",

      "cls" : "folder"

}]

 

服务器端可以使用这样的SQL语句来查询:

select t.orgid,t.orgname,t.parentid from organization t

where t.parentid='-100' and t.orgid!='-100'

下面的代码片断用于struts2 action类中:

 

public String treeNode() {

              try {

                     List<Object[]> list = this.organizationService.findByParentId(this.node);

                     if (list != null && !list.isEmpty()) {

                           boolean isFirst = true;


                           int i = 0;

                           int last = list.size();

                           for (Object[] o : list) {

                                  if (i == 0) {

                                         this.setJsonString("[{\"text\" :\"" + o[1].toString() + "\" ,\"id\" :\"" + o[0].toString()

                                                       + "\" ,\"cls\" :\"folder\"} ");

                                  } else if (i == (last - 1)) {

                                         this.setJsonString(this.getJsonString() + ",{\"text\" :\"" + o[1].toString() + "\" ,\"id\" :\""

                                                       + o[0].toString() + "\" ,\"cls\" :\"folder\"}]");

                                  } else {

                                         this.setJsonString(this.getJsonString() + ",{\"text\" :\"" + o[1].toString() + "\" ,\"id\" :\""

                                                       + o[0].toString() + "\" ,\"cls\" :\"folder\"}");

                                  }

                                  i++;

                           }

                     } else {

                           this.setJsonString("");

                     }

                     System.out.println(this.getJsonString());

              } catch (Exception e) {

                     // TODO Auto-generated catch block

                     e.printStackTrace();

                     return this.INPUT;

              }

              return this.SUCCESS;

       }

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