Javascript构建树层次结构

时间:2010-02-18 03:07:02

标签: javascript tree

var array = [{"grandpa","father"}, {"father"}, {"grandpa","father","me"}];

鉴于上面的数组,我想生成一个类似下面的java脚本对象(JSON),它具有类似父子结构。

{"id":"grandpa",
 "children":[
    {"id":"father",
     "children":[
        {"id":"me",
         "children":[]
        }]
    }]
}

3 个答案:

答案 0 :(得分:7)

如果您正在询问如何获取层次结构路径列表并创建树结构,那么您可以在JavaScript中执行以下操作:

function convertToHierarchy(arry /* array of array of strings */) 
{
    var item, path;

    // Discard duplicates and set up parent/child relationships
    var children = {};
    var hasParent = {};
    for (var i = 0; i < arry.length; i++) 
    {
        var path = arry[i];
        var parent = null;
        for (var j = 0; j < path.length; j++) 
        {
            var item = path[j];
            if (!children[item]) {
                children[item] = {};
            }
            if (parent) {
                children[parent][item] = true; /* dummy value */
                hasParent[item] = true;
            }
            parent = item;
        }
    }

    // Now build the hierarchy
    var result = [];
    for (item in children) {
        if (!hasParent[item]) {
            result.push(buildNodeRecursive(item, children));
        }
    }
    return result;
}

function buildNodeRecursive(item, children)
{
    var node = {id:item, children:[]};
    for (var child in children[item]) {
        node.children.push(buildNodeRecursive(child, children));
    }
    return node;
}

convertToHierarchy([["1","2"], ["1"], ["1","2","3"]]);

修改

你的问题仍然含糊不清。我之前的版本假设了这两件事:

  1. 每个节点ID唯一标识一个节点
  2. 指定的层次结构路径可以从根节点
  3. 以外的其他位置开始

    在此示例中,我将假设以下内容:

    1. 节点ID不是唯一的,但它们在特定节点的中是唯一的
    2. 所有层次结构路径都从树的根节点开始
    3. 以下是代码:

      function convertToHierarchy(arry /* array of array of strings */)
      {
          // Build the node structure
          var rootNode = {id:"root", children:{}}
          for (var i = 0; i < arry.length; i++)
          {
              var path = arry[i];
              buildNodeRecursive(rootNode, path, 0);
          }
          return rootNode;
      }
      
      function buildNodeRecursive(node, path, idx)
      {
          if (idx < path.length)
          {
              item = path[idx];
              if (!node.children[item])
              {
                  node.children[item] = {id:item, children:{}};
              }
              buildNodeRecursive(node.children[item], path, idx + 1);
          }
      }
      

      返回层次结构,但格式有点不同。但是,你应该了解情况。

答案 1 :(得分:0)

我认为这应该有效。我正在使用firebug来跟踪输出的结构。

    var el =  {"name": "Level 1", "paths" : ["fruits"]};
    var el2 = {"name": "Level 3", "paths" : ["fruits", "apples", "fuji"]};
    var el3 = {"name": "Level 4", "paths" : ["fruits", "apples", "fuji", "red"]};
    var el4 = {"name": "Level 2", "paths" : ["fruits", "apples"]};

    var allEl = [el, el2, el3, el4];


    /* Define recursive function for setting the child */
    function setChild(parent, pos, arr, name)
    {
        if(pos < arr.length)
        {
            if(pos == arr.length-1) //last element of the paths
                parent.name = name;

            if(!parent.children){
                parent.children = [];
                parent.children[0] = new Object();
            }
            setChild(parent.children[0], pos + 1, arr, name);
        }
    }

    /* Test starts here */
    var root = new Object();

    for(var i=0; i<allEl.length; i++)
    {
        var el = allEl[i];
        setChild(root, 0, el.paths, el.name);
    }

    //Firefox debugging ...getfirebug.com
    console.debug(root);

答案 2 :(得分:-3)

如果要编码JSON,只需使用JSON库。

不要尝试自己滚动。