为什么jQuery ajax不能序列化我的对象? [英] Why jQuery ajax does not serialize my object?

问题描述

我正在使用jQuery 1.7.1.并且我有以下问题/问题:

I am using jQuery 1.7.1. and I have the following question/problem:

代码如下:

var accountObject = new Object();
accountObject.account = new Object();
accountObject.account.sas = [];

$.ajax({
    type: "PUT",
    url: "/a/2",
    data: accountObject,
    dataType: "html",
    success: function(msg) {
        alert_user("Successfully saved the selected session attributes as defaults");
    },
    error: function(msg) {
        alert_user(msg);            
    }
});

问题是，由于我将accountObject.account.sas设置为一个空数组，因此data在服务器上完全变为空，如下所示:

The problem is that, due to the fact that I set accountObject.account.sas to an empty array, the data arrives completely empty at the server, as:

{}

它应该在的位置:

{ "account": { "sas": [] } }

当我在account的sas属性中放置一些条目时，一切正常.例如，如果将字符串"1"，"2"和"3"作为数组["1", "2", "3"]放置，那么我将进入服务器:

When I put some entries in the sas property of account then everything is ok. For example, if I put the string "1", "2" and "3" as an array ["1", "2", "3"] then I get on the server:

{ "account": { "sas": [ "1", "2", "3" ] } }

有人知道为什么会这样吗?

Does anybody know why this is so?

先谢谢了 帕纳约提斯(Panayotis)

Thanks in advance Panayotis

推荐答案

问题是无法在查询字符串中正确表示空数组.当您将对象层次结构传递给data时，jQuery将尝试将其转换为查询字符串，但无法弄清楚如何使用空数组.

The problem is that an empty array cannot be properly represented in a query string. When you pass the object hierarchy to data, jQuery will attempt to convert it to a query string, but can't figure out what to do with an empty array.

1.4.4每当传递相同的层次结构时似乎都返回一个空字符串的原因是，它试图将键传递给不带值的查询字符串，其结果将类似于:...&property=&.在大多数服务器环境中，默认情况下将其解释为空字符串.

The reason why 1.4.4 seemed to return an empty string whenever it got passed the same hierarchy was that it attempted to pass the key to the query string without a value, the result of which would be like: ...&property=&. This is by default interpreted as an empty string in most server environments.

我个人认为1.7.1的行为是正确的，因为它迫使开发人员检查参数是否存在，而不是改变参数的类型.

I personally consider the behavior of 1.7.1 correct, because it forces the developer to check for parameter existence instead of mucking the type of the parameter.

一些有关此处提到的各种事情的注释

• traditional: true是完全错误的，因为它永远无法处理对象层次结构.相反，您得到的是:...&key=[object Object]，这是javascript的toString()所有对象的默认结果.

• traditional: true is completely wrong, since it can never handle object hierarchies. What you get instead is: ...&key=[object Object], which is javascript's toString() default result for all objects.

JSON.stringify将导致整个内容作为JSON传递到查询字符串，除非您将其与processData: false结合使用，在这种情况下，您需要手动"反序列化为有意义的对象在服务器端.通常，这是一个有用的选项，但是在这种情况下，如果简单地进行一次检查就可以使事情工作的麻烦降到最低，那就过分了.

JSON.stringify assigned to data will result in the entire thing passed as JSON to the query string, unless you combine it with processData: false, in which case you need to deserialize into meaningful objects "by hand" on the server side. It's generally a useful option, but overkill in this case where a simple check would presumably have things working with minimal hassle.

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