JavaScript find json value

JavaScript find json value

本文关键字：value json find JavaScript      更新时间：2023-09-26

我需要在 json 国家/地区列表中搜索。json 就像：

[ 
{"name": "Afghanistan", "code": "AF"}, 
{"name": "Åland Islands", "code": "AX"}, 
{"name": "Albania", "code": "AL"}, 
{"name": "Algeria", "code": "DZ"}
]

我只从数据库中获取代码，并输出整个名称。因此，如果我得到"AL"，我想从json"Albania"

以下函数过滤数据，返回回调返回的数据 true ，即 data.code 等于请求的国家/地区代码。

function getCountryByCode(code) {
  return data.filter(
      function(data){ return data.code == code }
  );
}
var found = getCountryByCode('DZ');

请参阅下面的演示：

var data = [{
  "name": "Afghanistan",
  "code": "AF"
}, {
  "name": "Åland Islands",
  "code": "AX"
}, {
  "name": "Albania",
  "code": "AL"
}, {
  "name": "Algeria",
  "code": "DZ"
}];
function getCountryByCode(code) {
  return data.filter(
    function(data) {
      return data.code == code
    }
  );
}
var found = getCountryByCode('DZ');
document.getElementById('output').innerHTML = found[0].name;
<div id="output"></div>

这是一个JSFiddle。

var obj = [
  {"name": "Afghanistan", "code": "AF"}, 
  {"name": "Åland Islands", "code": "AX"}, 
  {"name": "Albania", "code": "AL"}, 
  {"name": "Algeria", "code": "DZ"}
];
// the code you're looking for
var needle = 'AL';
// iterate over each element in the array
for (var i = 0; i < obj.length; i++){
  // look for the entry with a matching `code` value
  if (obj[i].code == needle){
     // we found it
    // obj[i].name is the matched result
  }
}

只需以功能性方式使用 ES6 find() 函数：

var data=[{name:"Afghanistan",code:"AF"},{name:"Åland Islands",code:"AX"},{name:"Albania",code:"AL"},{name:"Algeria",code:"DZ"}];
let country = data.find(el => el.code === "AL");
// => {name: "Albania", code: "AL"}
console.log(country["name"]);

或 Lodash _.find：

var data=[{name:"Afghanistan",code:"AF"},{name:"Åland Islands",code:"AX"},{name:"Albania",code:"AL"},{name:"Algeria",code:"DZ"}];
let country = _.find(data, ["code", "AL"]);
// => {name: "Albania", code: "AL"}
console.log(country["name"]);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

首先将此结构转换为"字典"对象：

dict = {}
json.forEach(function(x) {
    dict[x.code] = x.name
})

然后简单地

countryName = dict[countryCode]
对于

国家/地区列表，这并不重要，但对于较大的列表，此方法可确保即时查找，而天真的搜索将取决于列表大小。

使@showdev答案更笼统。

var getObjectByValue = function (array, key, value) {
    return array.filter(function (object) {
        return object[key] === value;
    });
};

例：

getObjectByValue(data, "code", "DZ" );
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