js“樹”讀取xml資料

js|xml|資料

最近看到大家都練習寫樹，偶也學習學習寫了一個，大家多多批評，我好進步。

不過我看了一些樹的xml文檔都是在xml中就已經有了樹的結構，所以我寫了一個xml文檔不用分層，來產生樹的，不過要給每個節點定義編號和父編號。

寫得有點糙，大家不要笑話，以後逐漸學習在改進。

示範地址: www.lapuasi.com/javascript/xmltree

使用方法:
var tree = new xmlTree('tree'); //產生對象
tree.mode = 1; //設定初始模式，預設全部關閉。0全部關閉，1全部展開
tree.createTree(); //輸出樹

Javascript代碼:

/* JavaScript Document */

/*
xmlTree v1.2
=================================
Infomation
----------------------
Author   : Lapuasi
E-Mail   : lapuasi@gmail.com
WebSite  : http://www.lapuasi.com/javascript
DateTime : 2005-12-25
Example
----------------------
var tree = new xmlTree('tree'); //產生對象
tree.mode = 1; //設定初始模式，預設全部關閉。0全部關閉，1全部展開
tree.createTree(); //輸出樹
for Internet Explorer, Mozilla Firefox
*/
function xmlTree(name) {
 this.name         = name;                   //執行個體名稱
 this.xmlFile      = 'xmltree.xml';          //預設xml檔案
 this.iconPath     = 'images/'               //預設表徵圖路徑
 this.iconFolder   = 'tree_icon_folder.gif'; //預設資料夾表徵圖
 this.iconFile     = 'tree_icon_file.gif';   //預設檔案表徵圖
 this.iconOpen     = 'tree_arrow_open.gif';  //預設箭頭展開表徵圖
 this.iconOver     = 'tree_arrow_over.gif';  //預設箭頭活動圖表標
 this.iconClose    = 'tree_arrow_close.gif'; //預設箭頭關閉表徵圖
 this.mode         = 0;                      //初始模式，預設全部關閉。0全部關閉，1全部展開
 this.html         = '';                     //最終輸出html代碼
 this.prevTip      = null;                   //上一次被顯示的tip的時間編號 (內部使用)
 this.prevSelected = null;                   //上一次被選中的節點的自動編號 (內部使用)
}
xmlTree.prototype.createXMLDOM = function() { //產生XMLDOM對象
 var xmldom;
 if (window.ActiveXObject){
  var xmldom = new ActiveXObject("Microsoft.XMLDOM");
 } else {
  if (document.implementation && document.implementation.createDocument) {
   var xmldom = document.implementation.createDocument("","doc",null);
  }
 }
 xmldom.async = false;
 xmldom.resolveExternals = false;
 xmldom.validateOnParse = false;
 xmldom.preserveWhiteSpace = true;
 return xmldom;
}
xmlTree.prototype.createTree = function() { //產生並列印
 var xmldom = this.createXMLDOM();
 document.write('<div id="tree"><\/div>'); // 樹所用層
 document.write('<div id="treeTip"><\/div>'); //提示所用層
 document.getElementById('treeTip').style.visibility = 'visible';
 document.getElementById('treeTip').style.display = 'none';
 if (xmldom.load(this.xmlFile)) {
  this.createNodes(xmldom);
 } else {
  this.html = 'Load XML Error';
 }
 document.getElementById('tree').innerHTML = this.html;
 return;
}
xmlTree.prototype.getFirstChildData = function(obj, name) { //取得指定名稱節點的第一個子節點的資料
 var result = '';
 if (typeof(obj) == 'object' && name != null && name != '') {
  var node = obj.getElementsByTagName(name);
  if (node != null && node.length > 0) {
   result = node[0].firstChild.data;
  }
 }
 return result;
}
xmlTree.prototype.checkChildNodes = function(obj, id) { //檢測是否有分支
 var result = false;
 var nodes = obj.getElementsByTagName('node');
 if (nodes != null && nodes.length > 0) {
  //var pid;
  for (var i = 0; i < nodes.length; i++) {
   //pid = nodes[i].getAttribute('parentid');
   if (nodes[i].getAttribute('parentid') == id) {
    result = true;
    break;
   }
  }
 }
 return result;
}
xmlTree.prototype.createNodes = function(obj, id) { //產生指定編號節點的樹
 if (typeof(id) == 'undefined') id = null; //如果沒有id傳入則為根節點
 var nodes = obj.getElementsByTagName('node');
 if (nodes != null && nodes.length > 0) {
  var modeClass, modeSrc, iconClass, iconSrc;
  var nid, npid, nname, nicon, nlink, ntarget, nexplain, hasChildNodes;
  
  //判斷模式類型，並應用樣式
  modeClass = 'close';
  modeSrc = this.iconPath + this.iconClose;
  if (this.mode == 1) {
   modeSrc = this.iconPath + this.iconOpen;
   modeClass = 'open';
  }
  if (id == null) modeClass = 'open'; //若為根節點則顯示
  this.html += '<ul id="tree_' + id + '_c" class="' + modeClass + '">';

  for (var i = 0; i < nodes.length; i++) {
   npid = nodes[i].getAttribute('parentid');
   if (npid == id) {
    //初始化
    modeClass = 'close'; iconClass = 'icon-file'; iconSrc = this.iconPath + this.iconFile;

    //取得節點編號並檢測
    nid = nodes[i].getAttribute('id');
    this.html += '<li id="tree_' + nid + '"><span >';
    
    //取得節點自訂表徵圖
    //判斷是否含有子節點，並確定箭頭和表徵圖的圖片及樣式
    nicon = this.getFirstChildData(nodes[i], 'icon');
    hasChildNodes = this.checkChildNodes(obj, nid);
    if (hasChildNodes) {
     iconClass = '';
     iconSrc = this.iconPath + this.iconFolder;
     this.html += '<img id="tree_' + nid + '_a" src="' + modeSrc + '" class="arrow" \/>'; //箭頭
    }
    if (nicon != '') iconSrc = nicon;
    this.html += '<img id="tree_' + nid + '_i" src="' + iconSrc + '" class="' + iconClass + '" \/>'; //表徵圖

    //取得節點串連
    nlink = this.getFirstChildData(nodes[i], 'link');
    if (nlink != '') {
     nlink = ' href="' + nlink + '"';
    } else {
     nlink = ' href="javascript:;"';
    }

    //取得節點目標
    ntarget = this.getFirstChildData(nodes[i], 'target');
    if (ntarget != '') {
     ntarget = ' target="' + ntarget + '"';
    }

    //取得節點說明
    nexplain = this.getFirstChildData(nodes[i], 'explain');
    if (nexplain != '') {
     nexplain = ' '
    }

    //取得節點名稱
    nname = this.getFirstChildData(nodes[i], 'name');
    this.html += '<a id="tree_' + nid + '_l" ' + nlink + ntarget + nexplain + '>' + nname + '<\/a><\/span>';

    //obj.documentElement.removeChild(nodes[i]);
    if (hasChildNodes) this.createNodes(obj, nid); //迭代子節點

    this.html += '<\/li>';
   }
  }
  this.html += '<\/ul>';
 }
 return;
}
xmlTree.prototype.action = function(obj, e) { //節點操作
 e = e ? e : (window.event ? window.event : null); //擷取操作類型
 e = e.type;
 if (obj.tagName == 'A') {
  try { this.prevSelected.className = '';}
  catch(e) {}
  this.prevSelected = obj;
  obj.className = 'selected';
 }
 if (obj.tagName == 'SPAN') {
  var arrow = obj.firstChild; //取得箭頭對象
  var borther = obj;
  while (borther.tagName != 'UL') { //取得分支對象
   borther = borther.nextSibling;
   if (borther == null) break;
  }
  if (borther != null) {
   switch (e) { //檢測操作類型並執行相應代碼
    case 'click':
     if (borther.className == 'open') {
      borther.className = 'close';
      arrow.src = this.iconPath + this.iconClose;
     } else {
      borther.className = 'open';
      arrow.src = this.iconPath + this.iconOpen;
     }
     break;
    case 'mouseover':
     if (arrow.tagName == 'IMG' && borther.className == 'close') {
      arrow.src = this.iconPath + this.iconOver;
     }
     break;
    case 'mouseout':
     if (arrow.tagName == 'IMG' && borther.className == 'close') {
      arrow.src = this.iconPath + this.iconClose;
     }
     break;
   }
  }
 }
 return;
}
xmlTree.prototype.treeTips = function(msg) { //提示欄
 if (this.prevTip != null) clearTimeout(this.prevTip);
 var obj = document.getElementById('treeTip');
 if (obj != null) {
  if (this.treeTips.arguments.length < 1) { // hide
   obj.style.display = 'none';
  } else { // show
   obj.innerHTML = msg;
   this.prevTip = setTimeout('document.getElementById("treeTip").style.display = "block"',300);
   document.onmousemove = this.moveToMouseLoc;
  }
 }
 return;
}
xmlTree.prototype.moveToMouseLoc = function(e) { //移動到滑鼠所在位置
 var obj = document.getElementById('treeTip');
 if (obj != null) {
  var offsetX = -10, offsetY = 20;
  var x = 0, y = 0;
  if (window.event) {
   x = event.x + document.body.scrollLeft;
   y = event.y + document.body.scrollTop;
  } else {
   x = e.pageX;
   y = e.pageY;
  }
  obj.style.left = x + offsetX + 'px';
  obj.style.top = y + offsetY + 'px';
 }
 return;
}

xml 資料:

<?xml version="1.0" encoding="utf-8"?>

<!--
CODE BY Lapuasi.com [2005-12-14]

Explain:
===================================================
node 為樹的一個節點，具有以下屬性和內容
 屬性
  id: 編號，如果不唯一，只取第一個，其餘被忽略 (必須, 可以是任一字元組合)
  parentid: 父編號，沒有則為父節點 (可選, 可以是任一字元組合)
 內容
  name: 名稱 (必須)
  link: 串連 (可選)
  target: 目標 (可選)
  icon: 表徵圖 (可選)
  explain: 說明 (可選)
-->

<root>
 <node id="n1">
  <name>我的電腦</name>
  <icon>images/tree_icon_computer.gif</icon>
  <explain>顯示串連到此電腦的磁碟機和硬體</explain>
 </node>
 <node id="2" parentid="n1">
  <name>硬碟 (C:)</name>
  <icon>images/tree_icon_driver.gif</icon>
 </node>
 <node id="3">
  <name>網路位置</name>
  <icon>images/tree_icon_net.gif</icon>
  <explain>顯示到網站，網路電腦和FTP網站的捷徑</explain>
 </node>
 <node id="4" parentid="n1">
  <name>硬碟 (D:)</name>
  <icon>images/tree_icon_driver.gif</icon>
 </node>
 <node id="5" parentid="2">
  <name>Windows</name>
 </node>
 <node id="6" parentid="3">
  <name>menu6</name>
 </node>
 <node id="7" parentid="3">
  <name>menu7</name>
 </node>
 <node id="8" parentid="3">
  <name>menu8</name>
 </node>
 <node id="9" parentid="7">
  <name>menu9</name>
 </node>
 <node id="10">
  <name>資源回收筒</name>
  <icon>images/tree_icon_recycler.gif</icon>
  <explain>包含您已經刪除的檔案和檔案夾</explain>
 </node>
 <node id="11" parentid="5">
  <name>system32</name>
 </node>
 <node id="12" parentid="11">
  <name>system.dll</name>
  <link>http://www.lapuasi.com</link>
  <target>_blank</target>
 </node>
 <node id="13" parentid="7">
  <name>menu13</name>
 </node>
 <node id="14" parentid="n1">
  <name>DVD 磁碟機</name>
  <icon>images/tree_icon_cdrom.gif</icon>
 </node>
</root>