根据 JavaScript 中的属性值从对象数组中选择
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Select from array of objects based on property value in JavaScript
提问by sergioadh
I have JSON objects that have several properties such as an id and name. I store them in a JavaScript array and then based on a dropdownlist I want to retrieve the object from the JavaScript array based on its id.
我有 JSON 对象，这些对象具有多个属性，例如 id 和名称。我将它们存储在一个 JavaScript 数组中，然后基于下拉列表，我想根据其 id 从 JavaScript 数组中检索对象。
Suppose an object has id and name, how do I select them from my array variable?
假设一个对象有 id 和 name，我如何从我的数组变量中选择它们？
var ObjectsList = data;
var id = $("#DropDownList > option:selected").attr("value");
ObjectsList["id=" + id];
回答by mu is too short
Since you already have jQuery, you could use $.grep:
由于您已经拥有 jQuery，您可以使用$.grep：
Finds the elements of an array which satisfy a filter function. The original array is not affected.
查找满足过滤器函数的数组元素。原数组不受影响。
So something like this:
所以像这样：
var matches = $.grep(ObjectsList, function(e) { return e.id == id });
that will leave you with an array of matching entries from ObjectsListin the array matches. The above assumes that ObjectsListhas a structure like this:
这将为您留下数组中匹配条目ObjectsList的数组matches。以上假设ObjectsList具有如下结构：
[
{ id: ... },
{ id: ... },
...
]
If you know that there is only one match or if you only want the first then you could do it this way:
如果您知道只有一场比赛，或者您只想要第一场比赛，那么您可以这样做：
for(var i = 0, m = null; i < ObjectsList.length; ++i) {
if(ObjectsList[i].id != wanted_id)
continue;
m = a[i];
break;
}
// m is now either null or the one you want
There are a lot of variations on the forloop approach and a lot of people will wag a finger at me because they think continueis a bad word; if you don't like continuethen you could do it this way:
for循环方法有很多变体，很多人会对我摇摆不定，因为他们认为这continue是一个坏词；如果你不喜欢continue那么你可以这样做：
for(var i = 0, m = null; i < ObjectsList.length; ++i) {
if(ObjectsList[i].id == wanted_id) {
m = ObjectsList[i];
break;
}
}
