基于Javascript中的列表从Json中提取字段
基于Javascript中的列表从Json中提取字段
提问于 2019-07-10 02:58:33
我正在尝试从Json响应中提取一些字段，并将它们推入Javascript数组。我希望字段的选择是可配置的。下面是我正在做的事情：
将其视为我的JSON字符串：
{
"id" : "1234",
"orderNumber" : "1196",
"createdOn" : "2019-07-02T12:03:39.697Z",
"modifiedOn" : "2019-07-02T12:25:52.126Z",
"testmode" : false,
"customerEmail" : "a@b.com",
"billingAddress" : {
"firstName" : "John",
"lastName" : "Doe",
"address1" : "Wall Street",
"address2" : null,
"city" : "NYC",
"state" : "NY",
"countryCode" : "US",
"postalCode" : "12345",
"phone" : "1122334455"
}
}假设我想提取一些字段(在fields变量中定义)并将它们放入一个数组中。
# NOTE: the variable `data` here is my json object
var FIELDS = ['id', 'orderNumber', 'customerEmail', 'billingAddress.firstName', 'billingAddress.lastName']
var lineItem = []
# parse the data (my Json object)
for (var i = 0; i < FIELDS.length; i++){
lineItem.push(data[FIELDS[i]])
}因此，这对于第一层( id，orderNumber和customerEmail)似乎工作正常，但对于billingAddress.firstname等不是这样。这就是我想知道的。
我的目的是能够修改字段变量中的定义，而不需要对代码中的逻辑进行任何更改。
希望这是有意义的。谢谢!
回答 2
Stack Overflow用户
发布于 2019-07-10 03:05:54
只要键名中没有句点，它就可以工作。
var data = {
"id" : "1234",
"orderNumber" : "1196",
"createdOn" : "2019-07-02T12:03:39.697Z",
"modifiedOn" : "2019-07-02T12:25:52.126Z",
"testmode" : false,
"customerEmail" : "a@b.com",
"billingAddress" : {
"firstName" : "John",
"lastName" : "Doe",
"address1" : "Wall Street",
"address2" : null,
"city" : "NYC",
"state" : "NY",
"countryCode" : "US",
"postalCode" : "12345",
"phone" : "1122334455"
}
};
var FIELDS = ['id', 'orderNumber', 'customerEmail', 'billingAddress.firstName', 'billingAddress.lastName'];
var lineItem = [];
for (var i = 0; i < FIELDS.length; i++){
let obj = data;
let parts = FIELDS[i].split(".");
while(parts.length) obj = obj[parts.shift()];
lineItem.push(obj)
}
console.log(lineItem);
Stack Overflow用户
发布于 2019-07-10 03:06:21
您只需要一个函数，它将在.上拆分该路径并遍历JSON数据。这样你就可以在你的字段上使用map()了。
let data = {"id" : "1234","orderNumber" : "1196","createdOn" : "2019-07-02T12:03:39.697Z","modifiedOn" : "2019-07-02T12:25:52.126Z","testmode" : false,"customerEmail" : "a@b.com","billingAddress" : {"firstName" : "John","lastName" : "Doe","address1" : "Wall Street","address2" : null,"city" : "NYC","state" : "NY","countryCode" : "US","postalCode" : "12345","phone" : "1122334455"}}
var FIELDS = ['id', 'orderNumber', 'customerEmail', 'billingAddress.firstName', 'billingAddress.lastName']
// split an traverse
const getFromPath = (path, data) => path.split('.')
.reduce((curr, p) => curr && curr[p], data) // check for curr incase path is undefined
console.log(FIELDS.map(p => getFromPath(p, data)))
如果在对象中找不到遍历的任何部分，则函数getFromPath将返回undefined。
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原文链接：
https://stackoverflow.com/questions/56959076
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