jQuery Json 对象数组长度
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Json Object Array Length
提问by Patrick
I'm working with some Json that is similar to:
我正在使用一些类似于以下内容的 Json：
{
"Apps" : [
{
"Name" : "app1",
"id" : "1",
"groups" : [
{ "id" : "1", "name" : "test group 1", "desc" : "this is a test group" },
{ "id" : "2", "name" : "test group 2", "desc" : "this is another test group" }
]
}
]
}
If I parse it in jquery to return an object and I'm iterating through the apps like so:
如果我在 jquery 中解析它以返回一个对象并且我正在遍历应用程序，如下所示：
$.each(myJsonObject.Apps, function() { ... };
How can I get the length of this.groups?
我怎样才能得到 的长度this.groups？
I've tried
我试过了
- this.groups.length
- this.groups.length()
- $(this).groups.length()
- this.groups.length
- this.groups.length()
- $(this).groups.length()
and I cannot find any decent documentation on multiple tier json objects that have good information.
而且我找不到关于具有良好信息的多层 json 对象的任何体面的文档。
Any links or examples or suggestions would be appreciated.
任何链接或示例或建议将不胜感激。
回答by mattsven
Try:
尝试：
$.each(myJsonObject.Apps, function(i, obj) { ... });
obj.Groups.length;
回答by Peter Olson
Javascript is case sensitive. Change this.Groups.lengthto this.groups.length.
Javascript 区分大小写。更改this.Groups.length为this.groups.length。
This code should work:
此代码应该工作：
$.each(myJsonObject.Apps, function() {
alert(this.groups.length);
});
I have a working example on JSFiddle
我有一个关于JSFiddle的工作示例
To avoid this sort of problem, you should use a consistent capitalization. In Javascript, it is conventional to use camelCase.
为避免此类问题，您应该使用一致的大小写。在 Javascript 中，习惯上使用驼峰命名法。
回答by andres descalzo
this works well:
这很好用：
HTML:
HTML：
<span id="result"></span>
JS:
JS：
var myJsonObject =
{
"Apps" : [
{
"Name" : "app1",
"id" : "1",
"groups" : [
{ "id" : "1", "name" : "test group 1", "desc" : "this is a test group" },
{ "id" : "2", "name" : "test group 2", "desc" : "this is another test group" }
]
}
]
};
$.each(myJsonObject.Apps, function(i, el) {
$("#result").html(el.groups.length);
});
回答by Karthick Kumar
Try this: function objectCount(obj) {
试试这个： function objectCount(obj) {
objectcount = 0;
$.each(obj, function(index, item) {
objectcount = objectcount + item.length;
});
return objectcount;
}
objectCount(obj);
where obj is a json object with json array as sub objects
其中 obj 是一个 json 对象，以 json 数组作为子对象
回答by Murshida Mushfique
Try this
尝试这个
import org.json.JSONObject;
JSONObject myJsonObject = new JSONObject(yourJson);
int length = myJsonObject.getJSONArray("groups").length();
回答by Dominic Barnes
Looks like you just have a simple typo in your code. JavaScript is case-sensitive, so groupsis notthe same as Groups.
看起来您的代码中只有一个简单的错字。JavaScript是大小写敏感的，所以groups是不一样的Groups。
If your JSON object has groupsin all lowercase, like your example, then you only need to use this.groups.lengthinside the iteration function.
如果您的 JSON 对象groups全部为小写，就像您的示例一样，那么您只需要this.groups.length在迭代函数内部使用。
