【发布时间】：2015-04-28 13:40:25
【问题描述】：
我想从我的 sql 查询中构建分层数据结构。 在遵循this post 从平面对象构建分层 JSON 对象之后，我尝试在对象级别创建具有更多属性的 4 级层次结构，但不需要 children 属性。
我该怎么做？
这是我的 JavaScript (NodeJS) 代码：
var levels = ["counties_id","district_id", "municipalities_id", "institutes_id"];
data.forEach(function(d){
var depthCursor = newData.counties;
levels.forEach(function( property, depth ){
var index;
depthCursor.forEach(function(child,i){
if ( d[property] == child.counties_id ) index = i;
});
if ( isNaN(index) ) {
var propname = levels[depth];
var obj = {};
obj[propname] = d[property];
obj["children"] = [];
depthCursor.push(obj);
index = depthCursor.length - 1;
}
depthCursor = depthCursor[index].children;
if ( depth === levels.length - 1 ) {
depthCursor.push({ id : d.id, name : d.name, name_H : d.name_h });
}
});
});
一级没问题，因为这个等式检查相同的一级属性：
if ( d[property] == child.counties_id ) index = i;
我如何检查第 2、第 3 和第 4 级相同的情况？
这是不断尝试的扁平物体：
[
{
"counties_h":"Megye 1",
"counties_en":"Coun 1",
"counties_id":"1",
"district_h":"Korz 1",
"district_en":"Dist 1",
"district_id":"101",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"municipalities_id":"asdf",
"institutes_h":"Int 1",
"institites_en":"Inst 1",
"institutes_id":"1"
},
{
"counties_h":"Megye 1",
"counties_en":"Coun 1",
"counties_id":"1",
"district_h":"Korz 1",
"district_en":"Dist 1",
"district_id":"101",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"municipalities_id":"asdf",
"institutes_h":"Int 2",
"institites_en":"Inst 2",
"institutes_id":"2"
},
{
"counties_h":"Megye 1",
"counties_en":"Coun 1",
"counties_id":"1",
"district_h":"Korz 1",
"district_en":"Dist 1",
"district_id":"101",
"municipalities_h":"Onk 2",
"municipalities_en":"Mun 2",
"municipalities_id":"sdfg",
"institutes_h":"Int 1",
"institites_en":"Inst 1",
"institutes_id":"1"
},
{
"counties_h":"Megye 1",
"counties_en":"Coun 1",
"counties_id":"1",
"district_h":"Korz 1",
"district_en":"Dist 1",
"district_id":"101",
"municipalities_h":"Onk 2",
"municipalities_en":"Mun 2",
"municipalities_id":"sdfg",
"institutes_h":"Int 2",
"institites_en":"Inst 2",
"institutes_id":"2"
},
{
"counties_h":"Megye 1",
"counties_en":"Coun 1",
"counties_id":"1",
"district_h":"Korz 2",
"district_en":"Dist 2",
"district_id":"102",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"municipalities_id":"dfgh",
"institutes_h":"Int 1",
"institites_en":"Inst 1",
"institutes_id":"1"
},
{
"counties_h":"Megye 1",
"counties_en":"Coun 1",
"counties_id":"1",
"district_h":"Korz 2",
"district_en":"Dist 2",
"district_id":"102",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"municipalities_id":"dfgh",
"institutes_h":"Int 2",
"institites_en":"Inst 2",
"institutes_id":"2"
},
{
"counties_h":"Megye 2",
"counties_en":"Coun 2",
"counties_id":"2",
"district_h":"Korz 2",
"district_en":"Dist 2",
"district_id":"202",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"municipalities_id":"fghj",
"institutes_h":"Int 1",
"institites_en":"Inst 1",
"institutes_id":"1"
},
{
"counties_h":"Megye 2",
"counties_en":"Coun 2",
"counties_id":"2",
"district_h":"Korz 2",
"district_en":"Dist 2",
"district_id":"202",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"municipalities_id":"fghj",
"institutes_h":"Int 2",
"institites_en":"Inst 2",
"institutes_id":"2"
}
]
我当前代码的输出：
{
"counties":[
{
"counties_id":"1",
"children":[
{
"district_id":"101",
"children":[
{
"municipalities_id":"asdf",
"children":[
{
"institutes_id":"1",
"children":[
{
}
]
}
]
}
]
},
{
"district_id":"101",
"children":[
{
"municipalities_id":"asdf",
"children":[
{
"institutes_id":"2",
"children":[
{
}
]
}
]
}
]
},
{
"district_id":"101",
"children":[
{
"municipalities_id":"sdfg",
"children":[
{
"institutes_id":"1",
"children":[
{
}
]
}
]
}
]
},
{
"district_id":"101",
"children":[
{
"municipalities_id":"sdfg",
"children":[
{
"institutes_id":"2",
"children":[
{
}
]
}
]
}
]
},
{
"district_id":"102",
"children":[
{
"municipalities_id":"dfgh",
"children":[
{
"institutes_id":"1",
"children":[
{
}
]
}
]
}
]
},
{
"district_id":"102",
"children":[
{
"municipalities_id":"dfgh",
"children":[
{
"institutes_id":"2",
"children":[
{
}
]
}
]
}
]
}
]
},
{
"counties_id":"2",
"children":[
{
"district_id":"202",
"children":[
{
"municipalities_id":"fghj",
"children":[
{
"institutes_id":"1",
"children":[
{
}
]
}
]
}
]
},
{
"district_id":"202",
"children":[
{
"municipalities_id":"fghj",
"children":[
{
"institutes_id":"2",
"children":[
{
}
]
}
]
}
]
}
]
}
]
}
这就是我想要的：
{
"counties":[
{
"counties_id":"1",
"counties_h":"Megye 1",
"counties_en":"Coun 1",
"districts":[
{
"district_id":"101",
"district_h":"Korz 1",
"district_en":"Dist 1",
"municipalities":[
{
"municipalities_id":"asdf",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"institutes":[
{
"institutes_id":"1",
"institutes_h":"Int 1",
"institutes_en":"Inst 1"
},
{
"institutes_id":"2",
"institutes_h":"Int 2",
"institutes_en":"Inst 2"
}
]
},
{
"municipalities_id":"sdfg",
"municipalities_h":"Onk 2",
"municipalities_en":"Mun 2",
"institutes":[
{
"institutes_id":"3",
"institutes_h":"Int 1",
"institutes_en":"Inst 1"
},
{
"institutes_id":"4",
"institutes_h":"Int 2",
"institutes_en":"Inst 2"
}
]
}
]
},
{
"district_id":"102",
"district_h":"Korz 2",
"district_en":"Dist 2",
"municipalities":[
{
"municipalities_id":"dfgh",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"institutes":[
{
"institutes_id":"5",
"institutes_h":"Int 1",
"institutes_en":"Inst 1"
},
{
"institutes_id":"6",
"institutes_h":"Int 2",
"institutes_en":"Inst 2"
}
]
}
]
}
]
},
{
"counties_id":"2",
"counties_h":"Megye 2",
"counties_en":"Coun 2",
"districts":[
{
"district_id":"202",
"district_h":"Korz 2",
"district_en":"Dist 2",
"municipalities":[
{
"municipalities_id":"fghj",
"municipalities_h":"Onk 1",
"municipalities_en":"Mun 1",
"institutes":[
{
"institutes_id":"7",
"institutes_h":"Int 1",
"institutes_en":"Inst 1"
},
{
"institutes_id":"8",
"institutes_h":"Int 2",
"institutes_en":"Inst 2"
}
]
}
]
}
]
}
]
}
【问题讨论】：
-
JSON 应该在服务器中格式化并发送到客户端。您正在尝试的方法是一种不好的做法。
-
这个 JSON 格式在服务器端（使用 NodeJS）和我将发送给客户端的输出。
标签： javascript json node.js templates hierarchical-data