复制 Mike Bostock 的可折叠树

Question

我想复制 Mike Bostock 的可折叠树图形 (http://bl.ocks.org/mbostock/4339083)。

我使用d3.js 中的nest 函数加载了一个CSV。现在，数据看起来像这样：

 [
  {
    "key": "Bayer HealthCare",
    "values": [
      {
        "key": "Animal Health",
        "values": [
          {
            "key": "Companion Animal",
            "values": [
              {
                "brand": "Drontal",
                "product": "Companion Animal",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              },
              {
                "brand": "Profender",
                "product": "Companion Animal",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              },
              {
                "brand": "Rompun",
                "product": "Companion Animal",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              }
            ]
          },
          {
            "key": "Companion Animal - Food Animal Product",
            "values": [
              {
                "brand": "Baytril",
                "product": "Companion Animal - Food Animal Product",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              }
            ]
          },
          {
            "key": "Companion animals",
            "values": [
              {
                "brand": "Advantage",
                "product": "Companion animals",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              },
              {
                "brand": "Advantix",
                "product": "Companion animals",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              },
              {
                "brand": "Advocate",
                "product": "Companion animals",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              }
            ]
          },
          {
            "key": "Food Animal Product",
            "values": [
              {
                "brand": "Baycox",
                "product": "Food Animal Product",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              },
              {
                "brand": "Catosal",
                "product": "Food Animal Product",
                "subgroup": "Bayer HealthCare",
                "division": "Animal Health"
              }
            ]
          }
        ]
      }
.....

（完整的数据和我目前所做的可以在这里找到：http://jsfiddle.net/L3phF/9/）

不幸的是，我不知道如何将数据转换为像 https://gist.github.com/mbostock/1093025 这样的“FLARE JSON”格式。如果是正确的，我必须将“key”重命名为“name”，将“values”重命名为“children”，并且我必须在最低级别的每个对象前面插入“”name：“”。

感谢您的帮助！

Answer 1

这会将“key”重命名为“name”，将“values”重命名为“children”：

var renameKeys=function(obj){
    /*Recursively renames "key" keys to "name" and
    renames "values" keys to "children" */
    obj.name=obj.key;
    delete obj['key'];
    if(obj.values){
        obj.children=obj.values;
        delete obj.values;
        obj.children.forEach(renameKeys);
    }
    return obj;
};

您还需要为 JSON 提供一个“根”节点，以便使用您链接到的可折叠树可视化。应该这样做：

var nest = d3.nest()
    .key(function(d) { return d.subgroup; })
    .key(function(d) { return d.division; })
    .key(function(d) { return d.product; })
    .entries(parsed);

/*The visualization requires there to be a root node*/
var flareData={key:'root',values:[]};
flareData.values=nest;
renameKeys(flareData);

这里有一个 JSFiddle 来获取你想要的 JSON：http://jsfiddle.net/X2fxC/3/

这是一个带有可视化结果的 JSFiddle：http://jsfiddle.net/X2fxC/5/

使用扩展树可视化绘制时，您的数据如下所示：