需求

新增、修改終端需要選擇組織，組織是多級架構（樹狀圖顯示）。

思路

1、因為下拉框需要樹狀圖顯示，所以排除使用select做下拉框，改用input 模擬下拉框
2、樹狀圖採用zTree外掛

開工

1、佈局

<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{
    width: 0;
    height: 0;
    border-left: 3px solid transparent;
    border-right: 3px solid transparent;
    border-top: 6px solid black;;
    position: absolute;
    left:181px;
    top
 
:8px;

}
.org-select{
    cursor: default;
    z-index: -1;
    width:200px;
}
</style>
<div style="position: relative;margin:90px;">
    <input id="orgName" class="org-select" onclick="showTree()"  readonly > 
    <!-- 模擬select點選框 以及option的text值顯示-->
    <i class="trg"style="position:
 
 absolute;"></i>
    <!-- 模擬select右側倒三角 -->
    <input id="orgCode" type="hidden" name="orgCode" />
    <!-- 儲存 模擬select的value值 -->

    <!-- zTree樹狀圖 相對定位在其下方 -->
    <div class="ztree"  style="display:none; position: absolute;border:1px solid #4aa5ff;width:200px;">
        <ul id="treeDemo"></ul>
    </div>  
</div>

2、js方法部分

//樹狀圖展示
var orgList =[
      { id:1, pId:0, name:"父節點1 - 展開", open:true},
      { id:11, pId:1, name:"父節點11 - 摺疊"},
      { id:111, pId:11, name:"葉子節點111"},
      { id:112, pId:11, name:"葉子節點112"},
      { id:113, pId:11, name:"葉子節點113"},
      { id:114, pId:11, name:"葉子節點114"},
      { id:12, pId:1, name:"父節點12 - 摺疊"},
      { id:121, pId:12, name:"葉子節點121"},
      { id:122, pId:12, name:"葉子節點122"},
      { id:123, pId:12, name:"葉子節點123"},
      { id:124, pId:12, name:"葉子節點124"},     
  ];
  var setting = {
      data: {
          simpleData: {
              enable: true
          }
      },
      //回撥
      callback: {
          onClick: zTreeOnClick
      },
      view: {
          fontCss: { fontSize: "14px" }
      }
  };
  //節點點選事件
  function zTreeOnClick(event, treeId, treeNode) {
      $('#orgName').val(treeNode.name);
      $('#orgCode').val(treeNode.Id)
      hideTree();  
  };
  $(document).ready(function () {
      //初始組織樹狀圖
      $.fn.zTree.init($("#treeDemo"), setting, orgList);
  });
//下拉框顯示 隱藏
 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;
} 

//區域外點選事件
function onBodyDownByActionType(event) {  
    if (event.target.id.indexOf('treeDemo') == -1){  
        if(event.target.id != 'selectDevType'){
            hideTree(); 
        } 
    }  
}

效果圖