Let’s talk about how jQuery handles unencoded form data

jQuery's serialize() method is to serialize the data in the form into a URL-encoded string. But in some cases, we need to use raw, unencoded strings. In this case, we can use the serializeArray() method to convert the form data into a JSON array, and then write our own code to process it into the required format.

In this article, we will introduce how to use jQuery to handle unencoded form data.

1. Restrictions on the serialize() method

When using jQuery's serialize() method, the data will be URL encoded, which ensures data security and can be used in different transferred within the application. But sometimes, we need to send the raw form data directly to the backend server instead of encoding it first and then sending it.

For example, some backend frameworks (such as Spring MVC) automatically decode URL-encoded form data when they receive it. This means that when using the serialize() method, we need to pay attention to whether the data needs to be encoded.

2. Use the serializeArray() method

If we want to use the original, unencoded form data to send a request, we can use the serializeArray() method to Convert to JSON array. This method converts each element in the form into an object that contains the element's name, value, and type attributes.

For example, the following form:

It can be converted into a JSON array by the following code:

var formData = $("form").serializeArray();

The data structure of the array is as follows:

[
{ name: "user", value: "Alice", type : "text" },
{ name: "password", value: "123456", type: "text" }
]

2.1 Write your own data processing logic

Next, we can write our own data processing logic according to our own needs. For example, the following code converts a JSON array to raw, unencoded form data:

var formData = $("form").serializeArray();

var rawData = {};

formData.forEach(function(item) {
rawData[item.name] = item.value;
});

console.log($.param(rawData) ); // user=Alice&password=123456

2.2 Use the $.param() method to serialize the data into an unencoded string

If we want to use the serialize() method like With unencoded form data, you can use jQuery's $.param() method to serialize the data.

var formData = $("form").serializeArray();

var rawData = {};

formData.forEach(function(item) {
rawData[item.name] = item.value;
});

console.log($.param(rawData, true)); // user=Alice&password=123456

It should be noted that when using the $.param() method, the second parameter needs to be set to true to ensure that the output data is unencoded.

3. Summary

In this article, we introduced how to use jQuery to handle unencoded form data. By using the serializeArray() method, we can convert the form data into a JSON array and then write the code ourselves to process it into the required format. If you need to serialize the data to an unencoded string, you can use jQuery's $.param() method and set the second parameter to true.

Although in some cases it is necessary to use raw unencoded form data, in most cases we recommend using the serialize() method. This method can ensure data security and reduce background errors caused by non-standard data formats.

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