Question

jquery 根据id去找 json中list的数据

Answer 1

查找对象所有的属性，如果找到对象，递归；如果找到数组，检查每个元素，看id是不是所找的id。

假设数组里不会再嵌套数组了，如果有这种情况还要递归，原理一样的。

var json = '{"attrA":1,"listA":[{"id":1,"a":1,"b":1},{"id":2,"a":2,"b":3},{"id":3,"a":3,"b":3}],"listB":{"c":4,"d":[{"id":4,"a":4,"b":4},{"id":5,"a":5,"b":5}]}}';

var obj = JSON.parse(json);

function findDataById(obj, id){
	var res = null;
	for(var i in obj){
		if(Array.isArray(obj[i])){
			res = findDataInArr(obj[i], id);
		}else if(obj[i] && typeof obj[i] === "object"){
			res = findDataById(obj[i], id);
		}else{
			//is attribute
		}

		if(res){
	    	return res;
	    }
	}
	return null;
}

function findDataInArr(arr, id){
	for(var i = 0; i < arr.length; i++){
		if(arr[i].id === id){
			return arr[i];
		}
	}
	return null;
}

console.log(findDataById(obj, 2));
console.log(findDataById(obj, 3));
console.log(findDataById(obj, 4));
console.log(findDataById(obj,  8));

造了一个稍微复杂一点的对象用来测试:

追问

我的还是没有取到

追答

能不能发一下你的json

追问

{"code":200,"desc":"","List":[{"hotel_name":null, "roomList":[{"room_id":"132357002","dateList":[{"a":3,"price":"1380.0"}]},{"room_id":"132357004","dateList":[{"a":2,"price":"780.0"}]}]}]}

{"code":200,"desc":"","List":[{"hotel_name":null, "roomList":[{"room_id":"132357002","dateList":[{"a":3,"price":"1380.0"}]},{"room_id":"132357004","dateList":[{"a":2,"price":"780.0"}]}]}]}

追答

var obj = {"code":200,"desc":"","List":[{"hotel_name":null, "roomList":[{"room_id":"132357002","dateList":[{"a":3,"price":"1380.0"}]},{"room_id":"132357004","dateList":[{"a":2,"price":"780.0"}]}]}]};
 
function findDataById(obj, id){
    var res = null;
    for(var i in obj){
        if(Array.isArray(obj[i])){
            res = findDataInArr(obj[i], id);
        }else if(obj[i] && typeof obj[i] === "object"){
            res = findDataById(obj[i], id);
        }else{
            //is attribute
        }
 
        if(res){
            return res;
        }
    }
    return null;
}
 
function findDataInArr(arr, id){
    for(var i = 0; i < arr.length; i++){
        if(arr[i].room_id === id){
            return arr[i];
        }else if(arr[i] && typeof arr[i] === "object"){
            res = findDataById(arr[i], id);
        }

if(res){
            return res;
        }
    }
    return null;
}
 
console.log(findDataById(obj, "132357002"));
console.log(findDataById(obj, "132357004"));
console.log(findDataById(obj, "123"));

追问

能再问一下吗，我要取dateList里面的price