javascript - jquery each 使用 "where clause"迭代复杂的 JSON 结构

Question

我不是 100% 清楚如何制定一个 $.each() 函数。

以下 JSON 数据 block 包含数组 ItemValues 中的多个项目。我正在寻找的是一种方法(因为这个数据包可以任意大)在某种程度上获取每个 ItemValue 数组项 WHERE Fields.Id 相当于某个值“x”。

还有，是否有一些方法可以将 ItemValues[n].Fields.units 检索为数组？

JSON:

{
   "CacheName":"Default",
       "LastUpdateTime":"\/Date(1396994130568)\/",
       "Type":"Start",
       "TotalItemsCount":3,
       "PassingFilterCount":3,
       "ItemValues":[
      {
         "Fields":{
            "id":"13288263",
            "status":"8",
            "x_cord":"7250600",
            "y_cord":"566620200",
            "code":"1021",
            "sub_code":"1W",
            "priority":"1",
            "units":"1011, 1130, 1201, 1233, 1445, 1501, 1518, 1714, 1726, 1823, 1825, 1832, 3662",
            "ts":"20140402234025UT"
         },
         "Id":"13288263",
         "LastAction":"add"
      },
      {
         "Fields":{
            "id":"13288264",
            "status":"8",
            "x_cord":"",
            "y_cord":"",
            "code":"",
            "sub_code":"",
            "priority":"-1",
            "units":"",
            "ts":""
         },
         "Id":"13288264",
         "LastAction":"add"
      },
      {
         "Fields":{
            "id":"13288265",
            "status":"8",
            "x_cord":"",
            "y_cord":"",
            "code":"",
            "sub_code":"",
            "priority":"-1",
            "units":"",
            "ts":""
         },
         "Id":"13288265",
         "LastAction":"add"
      }
    ]
}

Answer 1

这是一个显示所有内容的代码(根据需要使用 $.each())，使用 JSON.parse()和 String.split()

var json_string = "Your JSON here";

//Use JSON.parse to make it an object
var json_object = JSON.parse(json_string.innerHTML);

//Will store the matched identifier
var matched_id;

//Will store the matched array
var matched_array;

//A valid test case, with units not null
var x = 13288263; 
$.each(json_object.ItemValues, function(key, item_value){
    if(item_value.Fields.id == x){
        matched_id = item_value.Fields.id;

        //Second part of the question
        var units = item_value.Fields.units;
        if(units != ""){
            //String.split() returns an array, by splitting the string with 
            //selected string
            matched_array = units.split(', ');
        }
    }
});

Here's a demo , 玩它。

注意:肯定有一些更好的解决方案。