根據另一個JSON對象的值訪問JSON對象

Question

請原諒我的主題。 不知道要放什么。

我有一些動態生成的數據。 數據與此類似。

var TypeA ={ "length" : "100" , "width" :"80" , "color" : "#ffffff" }    
var TypeB ={ "length" : "150" , "width" :"120" , "color" : "#4286f4" }
var TypeC ={ "length" : "150" , "width" :"120" , "color" : "#4202f4" }

上面的幾個JSON分別定義了類型A，B和C的屬性。 （實際上，有很多類型。）

現在我有如下實際數據：

 var data =[{id : "1" , label : "A1" , type : "TypeA" },
            {id : "2" , label : "A2" , type : "TypeA" },
            {id : "3" , label : "B1" , type : "TypeB" },
            {id : "4" , label : "A3" , type : "TypeA" },
            {id : "5" , label : "C1" , type : "TypeC" },
            {id : "6" , label : "B2" , type : "TypeB" }
            ]

現在，我通過循環運行data 。在這個循環中我需要根據訪問類型的屬性type數據JSON定義。

我正在做類似的事情，但是似乎沒有用。

$.each(JSON.parse(data), function(index,jsonObject){
      console.log("ColorCode : "+ jsonObject.type.color);
 });

任何人都可以幫助我如何在這里訪問類型屬性。 謝謝。

Answer 1

在您給出的示例中，您為每個類型定義定義了一個變量。 這使得它們更難訪問。 相反，您應該具有以下任一條件：

var types = {
  "TypeA": { "length" : "100" , "width" :"80" , "color" : "#ffffff" },
  "TypeB": { "length" : "150" , "width" :"120" , "color" : "#4286f4" },
  "TypeC": { "length" : "150" , "width" :"120" , "color" : "#4202f4" }
};

或這個：

var TypeA ={ "length" : "100" , "width" :"80" , "color" : "#ffffff" };  
var TypeB ={ "length" : "150" , "width" :"120" , "color" : "#4286f4" };
var TypeC ={ "length" : "150" , "width" :"120" , "color" : "#4202f4" };
var types = {
  "TypeA": TypeA,
  "TypeB": TypeB,
  "TypeC": TypeC
};

然后，很容易做到這一點：

JSON.parse(data).forEach(function(el) {
  console.log("ColorCode : " + types[el.type].color);
});

演示版

 var types = { "TypeA": { "length": "100", "width": "80", "color": "#ffffff" }, "TypeB": { "length": "150", "width": "120", "color": "#4286f4" }, "TypeC": { "length": "150", "width": "120", "color": "#4202f4" } }; var data =[ {id : "1" , label : "A1" , type : "TypeA" }, {id : "2" , label : "A2" , type : "TypeA" }, {id : "3" , label : "B1" , type : "TypeB" }, {id : "4" , label : "A3" , type : "TypeA" }, {id : "5" , label : "C1" , type : "TypeC" }, {id : "6" , label : "B2" , type : "TypeB" } ]; data.forEach(function (el) { console.log("ColorCode : " + types[el.type].color); }); 

Answer 2

我建議您在對象中定義Type

var obj = {
  "TypeA": {.... },
  "TypeB": {.... },,
  "TypeC": {.... },
};

那么您可以輕松地使用括號表示法來訪問基於屬性的字符串鍵。

 $.each(data, function(index,jsonObject){
      console.log("ColorCode : ", obj[jsonObject.type].color);
 });

 var obj = { "TypeA": { "length": "100", "width": "80", "color": "#ffffff" }, "TypeB": { "length": "150", "width": "120", "color": "#4286f4" }, "TypeC": { "length": "150", "width": "120", "color": "#4202f4" } }; var data = [{ id: "1", label: "A1", type: "TypeA" }, { id: "2", label: "A2", type: "TypeA" }, { id: "3", label: "B1", type: "TypeB" }, { id: "4", label: "A3", type: "TypeA" }, { id: "5", label: "C1", type: "TypeC" }, { id: "6", label: "B2", type: "TypeB" } ] $.each(data, function(index,jsonObject){ console.log("ColorCode : ", obj[jsonObject.type].color); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 

Answer 3

用window調用變量。

 var TypeA ={ "length" : "100" , "width" :"80" , "color" : "#ffffff" } var TypeB ={ "length" : "150" , "width" :"120" , "color" : "#4286f4" } var TypeC ={ "length" : "150" , "width" :"120" , "color" : "#4202f4" } var dataO = [{id : "1" , label : "A1" , type : "TypeA" }, {id : "2" , label : "A2" , type : "TypeA" }, {id : "3" , label : "B1" , type : "TypeB" }, {id : "4" , label : "A3" , type : "TypeA" }, {id : "5" , label : "C1" , type : "TypeC" }, {id : "6" , label : "B2" , type : "TypeB" }]; /*The data is already parsed.*/ dataO.forEach(function(key, index){ console.log(window[key.type].color); }); /*dataO.forEach(key => console.log(window[key.type].color));*/