如何使用嵌套数组对象访问d3 json文件中的值

Question

以前，我使用以下格式的json文件：

[{"lat":43.788458853157117,"lng":-79.282781549043008,"category":"volunteer","name":"Rita","url":"", "description":"xxx is a member of 13"},{"lat":43.7,"lng":-79.4,"category":"organization","name":"TCAN","url":"http://tcan.ca","description":"Lorem ipsum"}]

现在，我试图从Drupal站点生成json文件，并得到以下结构。 如何引用最低级别的字段。 我看过使用d3.net的示例，但未找到任何适用的示例。

{
    "organizations": [
        {
            "member": {
                "field_category": "organization",
                "body": "A network of organizations in Toronto devoted to climate change mitigation and adaptation.",
                "URL": "xxx.ca",
                "title": "Toronto Climate Action Network",
                "field_lat": 43.7,
                "field_long": -79.4
            }
        },
        {
            "member": {
                "field_category": "abc",
                "body": "xxx.",
                "URL": "",
                "title": "yyy",
                "field_lat": 43.7,
                "field_long": -79.28
            }
        }
    ]
}

Answer 1

假设您的数据存储在变量data ：

var bottom = data.organizations.map(function(d) { return d.member; });