jQuery 从json数组中成对获取值
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get values in pairs from json array
提问by xprilion
Firstly, this is my json value i am getting from a php source:
首先，这是我从 php 源获取的 json 值：
[{"oid":"2","cid":"107"},{"oid":"4","cid":"98"},{"oid":"4","cid":"99"}]
After that, I want to get and oidvalue along with the corresponding cidvalue for example, oid=2and cid=107at one go, oid=4and cid=98at another and so on. I am trying to use jquery, ajax for this.
在那之后，我想和oid沿值与相应cid例如价值，oid=2并且cid=107一气呵成，oid=4并cid=98在另一等等。我正在尝试为此使用 jquery、ajax。
I have tried many answers for this, like: Javascript: Getting all existing keys in a JSON arrayand loop and get key/value pair for JSON array using jQuerybut they don't solve my problem.
我为此尝试了很多答案，例如：Javascript：使用 jQuery 获取JSON 数组中的所有现有键并循环并获取JSON 数组的键/值对，但它们并没有解决我的问题。
I tried this:
我试过这个：
for (var i = 0; i < L; i++) {
var obj = res[i];
for (var j in obj) {
alert(j);
}
for (var i = 0; i < L; i++) {
var obj = res[i];
for (var j in obj) {
alert(j);
}
but all this did was to return the key name, which again did not work on being used.
但这一切所做的只是返回键名，这在被使用时再次不起作用。
回答by tymeJV
So, you have an array of key/value pairs. Loop the array, at each index, log each pair:
所以，你有一个键/值对数组。循环数组，在每个索引处，记录每一对：
var obj = [{"oid":"2","cid":"107"},{"oid":"4","cid":"98"},{"oid":"4","cid":"99"}];
for (var i = 0; i < obj.length; i++) {
console.log("PAIR " + i + ": " + obj[i].oid);
console.log("PAIR " + i + ": " + obj[i].cid);
}
回答by woofmeow
This is an array that you have //lets call it a:
这是一个你拥有的数组 //让我们称之为：
[{"oid":"2","cid":"107"},{"oid":"4","cid":"98"},{"oid":"4","cid":"99"}]
[{"oid":"2","cid":"107"},{"oid":"4","cid":"98"},{"oid":"4","cid": “99”}]
To get first element :
获取第一个元素：
a[0]// this will give you first object i.e {"oid":"2","cid":"107"}
a[0]// 这会给你第一个对象，即 {"oid":"2","cid":"107"}
a[0]["oid"]// this will give you the value of the first object with the key "oid" i.e 2
a[0]["oid"]// 这会给你第一个键为“oid”的对象的值，即 2
and so on ...
等等 ...
Hope that helps. `
希望有帮助。`
回答by Diode
Basically what you need is grouping of objects in the array with a property. Here I am giving two functions using which you can do this
基本上，您需要的是使用属性对数组中的对象进行分组。在这里，我提供了两个函数，您可以使用它们来执行此操作
// To map a property with other property in each object.
function mapProperties(array, property1, property2) {
var mapping = {};
for (var i = 0; i < data.length; i++) {
var item = data[i];
mapping[item[property1]] = mapping[item[property1]] || [];
mapping[item[property1]].push(item[property2]);
}
return mapping;
}
// To index the items based on one property.
function indexWithProperty(array, property) {
var indexing = {};
for (var i = 0; i < data.length; i++) {
var item = data[i];
indexing[item[property]] = indexing[item[property]] || [];
indexing[item[property]].push(item);
}
return indexing;
}
var data = [{
"oid": "2",
"cid": "107"
}, {
"oid": "4",
"cid": "98"
}, {
"oid": "4",
"cid": "99"
}];
var oidCidMapping = mapProperties(data, "oid", "cid");
console.log(oidCidMapping["2"]); // array of cids with oid "2"
var indexedByProperty = indexWithProperty(data, "oid");
console.log(indexedByProperty["4"]); // array of objects with cid "4"
May not be the exact solution you need, but I hope I am giving you the direction in which you have to proceed.
可能不是您需要的确切解决方案，但我希望我为您提供了必须继续的方向。
If you are willing to use other library you can achieve the same with underscorejs
如果您愿意使用其他库，您可以使用underscorejs实现相同的目的
