Introductory tutorial on using the zTree plug-in drop-down tree_javascript skills

var zNodes =[

      {id:1, pId:0, name:"北京"},

      {id:2, pId:0, name:"天津"},

      {id:3, pId:0, name:"上海"},

      {id:6, pId:0, name:"重庆"},

      {id:4, pId:0, name:"河北省", open:true, nocheck:true},

      {id:41, pId:4, name:"石家庄"},

      {id:42, pId:4, name:"保定"},

      {id:43, pId:4, name:"邯郸"},

      {id:44, pId:4, name:"承德"},

      {id:5, pId:0, name:"广东省", open:true, nocheck:true},

      {id:51, pId:5, name:"广州"},

      {id:52, pId:5, name:"深圳"},

      {id:53, pId:5, name:"东莞"},

      {id:54, pId:5, name:"佛山"},

      {id:6, pId:0, name:"福建省", open:true, nocheck:true},

      {id:61, pId:6, name:"福州"},

      {id:62, pId:6, name:"厦门"},

      {id:63, pId:6, name:"泉州"},

      {id:64, pId:6, name:"三明"}

     ];

public class ZtreeNode {

  // id

  private String id;

  // 父id

  private String pId;

  // 显示名称

  private String name;

  // 是否打开 (这里默认是不打开的，如果需要打开，设为true)

  // private boolean open ;

  // 能否选择 （设置节点是否能够选择，默认都能选择，设为true对应的节点不能选择）

  // private boolean nocheck ;

  /**getter and setter*/

}

// 获取商品分类树 返回json

  public String getGoodsCategoryTreeJson() {

    List<GoodsCategory> allGoodsCategoryList = goodsCategoryService.getGoodsCategoryTreeJson() ;

    List<ZtreeNode> ztreelist = new ArrayList<ZtreeNode>();

    for(GoodsCategory gcty : allGoodsCategoryList){

      ZtreeNode treenade = new ZtreeNode();

      treenade.setId(gcty.getId());

      treenade.setpId(gcty.getParent()==null?"":gcty.getParent().getId());

      treenade.setName(gcty.getName());

      ztreelist.add(treenade);

    }

    return ajax(ztreelist);

  }

import org.springframework.base.util.JsonUtil;

private static final String HEADER_ENCODING = "UTF-8";

private static final boolean HEADER_NO_CACHE = true;

private static final String HEADER_TEXT_CONTENT_TYPE = "text/plain";

private static final String HEADER_JSON_CONTENT_TYPE = "text/plain";

// AJAX输出

  protected String ajax(String content, String contentType) {

    try {

      HttpServletResponse response = initResponse(contentType);

      response.getWriter().write(content);

      response.getWriter().flush();

    } catch (IOException e) {

      e.printStackTrace();

    }

    return NONE;

  }

  // 根据文本内容输出AJAX

  protected String ajax(String text) {

    return ajax(text, HEADER_TEXT_CONTENT_TYPE);

  }

  // 根据操作状态输出AJAX

  protected String ajax(Status status) {

    HttpServletResponse response = initResponse(HEADER_JSON_CONTENT_TYPE);

    Map<String, String> jsonMap = new HashMap<String, String>();

    jsonMap.put(STATUS_PARAMETER_NAME, status.toString());

    JsonUtil.toJson(response, jsonMap);

    return NONE;

  }

  // 根据操作状态、消息内容输出AJAX

  protected String ajax(Status status, String message) {

    HttpServletResponse response = initResponse(HEADER_JSON_CONTENT_TYPE);

    Map<String, String> jsonMap = new HashMap<String, String>();

    jsonMap.put(STATUS_PARAMETER_NAME, status.toString());

    jsonMap.put(MESSAGE_PARAMETER_NAME, message);

    JsonUtil.toJson(response, jsonMap);

    return NONE;

  }

  // 根据Object输出AJAX

  protected String ajax(Object object) {

    HttpServletResponse response = initResponse(HEADER_JSON_CONTENT_TYPE);

    JsonUtil.toJson(response, object);

    return NONE;

  }

  // 根据boolean状态输出AJAX

  protected String ajax(boolean booleanStatus) {

    HttpServletResponse response = initResponse(HEADER_JSON_CONTENT_TYPE);

    Map<String, Object> jsonMap = new HashMap<String, Object>();

    jsonMap.put(STATUS_PARAMETER_NAME, booleanStatus);

    JsonUtil.toJson(response, jsonMap);

    return NONE;

  }

　　private HttpServletResponse initResponse(String contentType) {

    HttpServletResponse response = ServletActionContext.getResponse();

    response.setContentType(contentType + ";charset=" + HEADER_ENCODING);

    if (HEADER_NO_CACHE) {

      response.setDateHeader("Expires", 1L);

      response.addHeader("Pragma", "no-cache");

      response.setHeader("Cache-Control", "no-cache, no-store, max-age=0");

    }

    return response;

  }

<link rel="stylesheet" href="${base}/template/ztree/css/demo.css" type="text/css">

<link rel="stylesheet" href="${base}/template/ztree/css/zTreeStyle/zTreeStyle.css" type="text/css">

<script type="text/javascript" src="${base}/template/ztree/js/jquery.ztree.core.js"></script>

div.content_wrap {width: 400px;}

div.content_wrap div.left{float: left;}

div.content_wrap div.right{float: right;width: 340px;}

div.zTreeDemoBackground {text-align:left;}

ul.ztree {margin-top: 10px;border: 1px solid #617775;background: #fefefe;width:220px;height:360px;overflow-y:scroll;overflow-x:auto;}

ul.log {border: 1px solid #617775;background: #f0f6e4;width:300px;height:170px;overflow: hidden;}

ul.log.small {height:45px;}

ul.log li {color: #666666;list-style: none;padding-left: 10px;}

ul.log li.dark {background-color: #E3E3E3;}

/* ruler */

div.ruler {height:20px; width:220px; background-color:#f0f6e4;border: 1px solid #333; margin-bottom: 5px; cursor: pointer}

div.ruler div.cursor {height:20px; width:30px; background-color:#3C6E31; color:white; text-align: right; padding-right: 5px; cursor: pointer}

<div class="content_wrap">

  <div class="zTreeDemoBackground left">

     <input id="citySel" class="formText" type="text" onclick="showMenu(); return false;" readonly value="" style="width:150px;"/>

     <input id="treeids" type="hidden" name="goods.goodsCategory.id" >

     <input type="button" onclick="showMenu();" value="∨">

  </div>

</div>

 8<div id="menuContent" class="menuContent" style="display:none; position: absolute;">

  <ul id="treeDemo" class="ztree" style="margin-top:0;"></ul>

</div>

<SCRIPT type="text/javascript">

    var setting = {

      view: {

        dblClickExpand: false

      },

      data: {

        simpleData: {

          enable: true

        }

      },

      callback: {

        onClick: onClick

      },

      view: {

　　　　　　　　　 // 不显示对应的图标

        showIcon: false

      }

    };

    function onClick(e, treeId, treeNode) {

      var zTree = $.fn.zTree.getZTreeObj("treeDemo"),

      nodes = zTree.getSelectedNodes(),

      v = "";

      ids = "";

      nodes.sort(function compare(a,b){return a.id-b.id;});

      for (var i=0, l=nodes.length; i<l; i++) {

        v += nodes[i].name + ",";

        ids += nodes[i].id + ",";

      }

      if (v.length > 0 ) v = v.substring(0, v.length-1);

      var cityObj = $("#citySel");

      cityObj.attr("value", v);

      // 将选中的id放到隐藏的文本域中

      if (ids.length > 0 ) ids = ids.substring(0, ids.length-1);

      var treeids = $("#treeids");

      treeids.attr("value", ids);

    }

    function showMenu() {

      var cityObj = $("#citySel");

      var cityOffset = $("#citySel").offset();

      $("#menuContent").css({left:cityOffset.left + "px", top:cityOffset.top + cityObj.outerHeight() + "px"}).slideDown("fast");

      $("body").bind("mousedown", onBodyDown);

    }

    function hideMenu() {

      $("#menuContent").fadeOut("fast");

      $("body").unbind("mousedown", onBodyDown);

    }

    function onBodyDown(event) {

      if (!(event.target.id == "menuBtn" || event.target.id == "menuContent" || $(event.target).parents("#menuContent").length>0)) {

        hideMenu();

      }

    }

    var zNodes ;

    $(document).ready(function(){

 　　　　　　// 加载数据

      $.ajax({ 

        async : false, 

        cache:false, 

        type: 'POST', 

        dataType : 'json', 

        url: '${base}/admin/goods!getGoodsCategoryTreeJson.action',

        error: function () {

          alert('请求失败'); 

        }, 

        success:function(data){

          zNodes = data;

        } 

      });

      $.fn.zTree.init($("#treeDemo"), setting, zNodes);

    });

</SCRIPT>

<script type="text/javascript">

$(document).ready(function(){

  if ("${goods.goodsCategory.id}"!="") {

    var treeObj = $.fn.zTree.getZTreeObj("treeDemo");

    var node = treeObj.getNodeByParam("id", "${goods.goodsCategory.id}" , null);

    treeObj.selectNode(node,false , false);

    onClick(event,"${goods.goodsCategory.id}",node,true);

  }

});

</script>