如何使用 dojo 对 Json 中的不同值进行计数或求和

发布于 2024-08-21 15:46:50 字数 725 浏览 12 评论 0原文

我从 ArcGIS 服务器收到了一个 Json 响应，如下所示：

{  "displayFieldName" : "ELTTYPE", 
"features" : [
{
  "attributes" : {
    "ELTTYPE" : "Faldunderlag", 
    "DATANR" : 721301, 
    "ELEMENTNR" : 40, 
    "AREALTYPE" : "BELÆGNING", 
    "SHAPE.area" : 26.4595572
  }
}, 
{
  "attributes" : {
    "ELTTYPE" : "Prydplæne", 
    "DATANR" : 721301, 
    "ELEMENTNR" : 2, 
    "AREALTYPE" : "GRÆS", 
    "SHAPE.area" : 1993.23450096
  }
}, 
{
  "attributes" : {
    "ELTTYPE" : "Busket", 
    "DATANR" : 721301, 
    "ELEMENTNR" : 18, 
    "AREALTYPE" : "BUSKE", 
    "SHAPE.area" : 2105.69020834
  }
}...... and so on ]
}

我喜欢使用 ELEMENTNR 的不同值和 SHAPE.area 的求和值创建一个数据网格。

有人知道如何做到这一点吗？

塞巴斯蒂安

原文

I'we got a Json response from a ArcGIS server that look like this:

{  "displayFieldName" : "ELTTYPE", 
"features" : [
{
  "attributes" : {
    "ELTTYPE" : "Faldunderlag", 
    "DATANR" : 721301, 
    "ELEMENTNR" : 40, 
    "AREALTYPE" : "BELÆGNING", 
    "SHAPE.area" : 26.4595572
  }
}, 
{
  "attributes" : {
    "ELTTYPE" : "Prydplæne", 
    "DATANR" : 721301, 
    "ELEMENTNR" : 2, 
    "AREALTYPE" : "GRÆS", 
    "SHAPE.area" : 1993.23450096
  }
}, 
{
  "attributes" : {
    "ELTTYPE" : "Busket", 
    "DATANR" : 721301, 
    "ELEMENTNR" : 18, 
    "AREALTYPE" : "BUSKE", 
    "SHAPE.area" : 2105.69020834
  }
}...... and so on ]
}

I like to make a datagrid with the distinct values of ELEMENTNR and the summurized values of SHAPE.area.

Does any have an idea how to do this?

Sebastian

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一江春梦 2024-08-28 15:46:50

请参阅 Array.prototype.filter

您需要包含过滤器脚本片段，以便将其用于不支持的浏览器。

function reduceMyData(input) {
  var check = {};
  return input.filter(function(item, index, ary){
    var id = item.attributes["ELEMENTNR"];
    if (check[id]) return false;
    return check[id] = true;
  });
}

var myFeatures = reduceMyData(data.features);

see Array.prototype.filter

You'll need to include the filter script snippet in order to utilize it for unsupported browsers..

function reduceMyData(input) {
  var check = {};
  return input.filter(function(item, index, ary){
    var id = item.attributes["ELEMENTNR"];
    if (check[id]) return false;
    return check[id] = true;
  });
}

var myFeatures = reduceMyData(data.features);

回复收藏 0 原文

初相遇 2024-08-28 15:46:50

据我了解，您不仅需要获取具有不同 ELENTNR 的元素，还需要为具有相同 ELENTNR 的元素积累 SHAPE.area 。如果是这样：

var codes = {};
// features - is an array of features from your json
var distinctFeatures = dojo.filter(features, function(m){
    if(typeof(codes[m.attributes.ELEMENTNR]) == "undefined"){
        codes[m.attributes.ELEMENTNR] = m.attributes["SHAPE.area"];
        return true;
    }
    else{ // if duplicate
        codes[m.attributes.ELEMENTNR] += m.attributes["SHAPE.area"];
        return false;
    }
});
for(var index in distinctFeatures){
    var elementNr = distinctFeatures[index].attributes.ELEMENTNR;
    distinctFeatures[index].attributes["SHAPE.area"] = codes[elementNr];
}

As I understand you need not only to get elements with distinct ELENTNR, but also to accumulate SHAPE.area for the elements with the same ELENTNR. If so:

var codes = {};
// features - is an array of features from your json
var distinctFeatures = dojo.filter(features, function(m){
    if(typeof(codes[m.attributes.ELEMENTNR]) == "undefined"){
        codes[m.attributes.ELEMENTNR] = m.attributes["SHAPE.area"];
        return true;
    }
    else{ // if duplicate
        codes[m.attributes.ELEMENTNR] += m.attributes["SHAPE.area"];
        return false;
    }
});
for(var index in distinctFeatures){
    var elementNr = distinctFeatures[index].attributes.ELEMENTNR;
    distinctFeatures[index].attributes["SHAPE.area"] = codes[elementNr];
}

回复收藏 0 原文

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