树形下拉框ztree、获取ztree所有父节点，ztree的相关方法

需求

添加、修改的终端需要选择组织，组织是多级架构（树状图显示）。

思路

1、因为下拉框需要树状图显示，所以排除使用select做下拉框，改用input 模拟下拉框 
2、树状图采用zTree插件

开始

1、布局

<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/zTree.v3/3.5.33/js/jquery.ztree.core.min.js"></script>
<link href="https://cdn.bootcss.com/zTree.v3/3.5.33/css/zTreeStyle/zTreeStyle.min.css" rel="stylesheet">
<style>
    .trg{/*设置三角符号的样式*/
        width: 0;
        height: 0;
        border-left: 6px solid transparent;
        border-right: 6px solid transparent;
        border-top: 6px solid black;;
        position: absolute;
        left:380px;
        top:12px;
    }
    .org-select{/*设置input框的样式*/
        cursor: default;
        z-index: -1;
        width:400px;
    }
    #treeDemo{/*设置树结构的样式*/
        position:absolute;
        z-index:1;/*层级定位高一些，absolute或者relative时，显示层级的优先级*/
        overflow：hidden;/*去除浮动*/
        background-color: white;/*背景色*/
        width:100%;
        border:1px solid #4aa5ff;
    }      
</style>
<div style="position: relative;margin:90px;">
    <input id="orgName" class="org-select" onclick="showTree()"  readonly > 
    <!-- 模拟select点击框 以及option的text值显示-->
    <i class="trg"style="position: absolute;"></i>
    <!-- 模拟select右侧倒三角 -->
    <input id="orgCode" type="hidden" name="orgCode" />
    <!-- 存储 模拟select的value值 -->
    <div class="ztree"  style="display:none; position: absolute;border:1px solid #4aa5ff;width:200px;">
        <ul id="treeDemo"></ul>
        <!-- zTree树状图 相对定位在其下方 -->
    </div>  
</div>    

 2、js代码

//树状图展示
var orgList =[
      { id:1, pId:0, name:"父节点1 - 展开", open:true},
      { id:11, pId:1, name:"父节点11 - 折叠"},
      { id:111, pId:11, name:"叶子节点111"},
      { id:112, pId:11, name:"叶子节点112"},
      { id:113, pId:11, name:"叶子节点113"},
      { id:114, pId:11, name:"叶子节点114"},
      { id:12, pId:1, name:"父节点12 - 折叠"},
      { id:121, pId:12, name:"叶子节点121"},
      { id:122, pId:12, name:"叶子节点122"},
      { id:123, pId:12, name:"叶子节点123"},
      { id:124, pId:12, name:"叶子节点124"}    
  ];
/*两种格式都可以*/
var orgList =[
        { name:"***平台系统", open:true,
            children: [
                { name:"**核心系统", open:true,
                    children: [{ name:"数据维护系统" }
                        ,{ name:"新数据维护系统" }
                    ]}
                ,{ name:"北分车险****" }
                ,{ name:"北京上海易*****" }
                
            ]}
    ,{ name:"**增项目" }
    ,{ name:"客服体系" }
    ];
  var setting = {
      data: {
          simpleData: {
              enable: true
          }
      },
      //回调
      callback: {
          onClick: zTreeOnClick
      },
      view: {
          fontCss: { fontSize: "14px" }
      }
  };
//节点点击事件
function zTreeOnClick(event, treeId, treeNode) {
    name = getFilePath(treeNode);
    $('#orgName').val(name);
    hideTree();  
};
//获取子节点，所有父节点的name的拼接字符串
function getFilePath(treeObj){
    if(treeObj==null)return "";
    var filename = treeObj.name;
    var pNode = treeObj.getParentNode();
    if(pNode!=null){
        filename = getFilePath(pNode) +">"+ filename;
    }
    return filename;
}
  $(document).ready(function () {
      //初始组织树状图
      $.fn.zTree.init($("#treeDemo"), setting, orgList);
  });
//下拉框显示 隐藏
 function showTree(){
    if($('.ztree').css('display') == 'none'){
         $('.ztree').css('display','block'); 
     } else{
         $('.ztree').css('display','none'); 
     }
     $("body").bind("mousedown", onBodyDownByActionType); 
 }
 function hideTree() {  
    $('.ztree').css('display','none');
    $("body").unbind("mousedown", onBodyDownByActionType); 
    return false;
} 

//区域外点击事件
function onBodyDownByActionType(event) {  
    if (event.target.id.indexOf('treeDemo') == -1){  
        if(event.target.id != 'selectDevType'){
            hideTree(); 
        } 
    }  
}

 3、展示