jQuery 按数组列表中的名称访问对象
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Access object by name in array list
提问by Code Junkie
I have an object that contains an array list of objects. I'd like to get the value of an object within the array list.
我有一个包含对象数组列表的对象。我想获取数组列表中对象的值。
example
例子
var data = {
items1: [{ id: 1, name: 'foo' }, { id: 2, name: 'bar' }],
items2: [{ id: 3, name: 'foo' }, { id: 4, name: 'bar' }]
};
I'm trying to access the name of id:1 in array list items1.
我正在尝试访问数组列表 items1 中 id:1 的名称。
I thought it would be something like
我以为它会是这样的
data['items1']['id'].name
but I think I'm missing something. Anybody know what I might be doing wrong
但我想我错过了一些东西。任何人都知道我可能做错了什么
回答by Chad
This is an object with 2 keys (items1and items2), both of which are arrays. Within each array are elements which are objects, each containing 2 keys (idand name).
这是一个具有 2 个键 (items1和items2)的对象，它们都是数组。每个数组中都有作为对象的元素，每个元素包含 2 个键（id和name）。
To get the idof the first element of the items1array you would do:
要获取数组id的第一个元素的 ，items1您将执行以下操作：
data.items1[0].id
which would return 1.
这将返回1。
If you wanted to search for the object with a name of 'bar' in items2you could do something like:
如果您想搜索名称为“bar”的对象，items2您可以执行以下操作：
function find(item, name) {
//no such array
if(!data[item])
return;
//search array for key
var items = data[item];
for(var i = 0; i < items.length; ++i) {
//if the name is what we are looking for return it
if(items[i].name === name)
return items[i];
}
}
var obj = find('items2', 'bar');
obj.id; //4
obj.name; //'bar'
I highly suggest reading about JavaScript Objectsand Arrays.
我强烈建议阅读JavaScript Objectsand Arrays。
回答by Hymanson
You can only access array items by their numeric index. For example:
您只能通过数字索引访问数组项。例如：
// The first item in the array
data['items1'][0].name
// The second
data['items1'][1].name
If you want to lookup by id, you can make a little function to do that for you:
如果您想通过 id 查找，您可以创建一个小函数来为您执行此操作：
function getItemById(anArray, id) {
for (var i = 0; i < anArray.length; i += 1) {
if (anArray[i].id === id) {
return anArray[i];
}
}
}
var theName = getItemById(data['items1'], 1).name;
回答by jancha
As items1 is array, you should write:
由于 items1 是数组，你应该写：
data.items1[0].name
回答by Kelsadita
Try this data['items1'][0].name
尝试这个 data['items1'][0].name
