How to use $.param method without URL encoding

When using jQuery's Ajax request, we often use the $.param method to serialize an object into a query string to facilitate data transmission. The $.param method automatically URL-encodes the data, for example, converting spaces to . However, sometimes we want to serialize the object without URL encoding and keep it as it is. This article will introduce how to use the $.param method without URL encoding.

First, let’s take a look at the basic usage of the $.param method. Suppose there is the following object:

var data = {
  name: 'John Doe',
  age: 30,
  company: 'ABC Inc.',
  address: {
    street: '123 Main St',
    city: 'Anytown',
    state: 'CA',
    zip: '12345'
  }
};

We can use the $.param method to serialize it into a query string, as shown below:

var queryString = $.param(data);

// queryString 的值为：
// "name=John%20Doe&age=30&company=ABC%20Inc.&address%5Bstreet%5D=123%20Main%20St&address%5Bcity%5D=Anytown&address%5Bstate%5D=CA&address%5Bzip%5D=12345"

As you can see, the $.param method serializes the object The URL is encoded, spaces are converted to , and some special characters are encoded. If we want to keep the original look, we need to use a little trick.

First, we need to define a function that does not perform URL encoding, as follows:

function serializeParam(obj) {
  var str = [];
  for (var p in obj) {
    if (obj.hasOwnProperty(p)) {
      str.push(encodeURIComponent(p) + '=' + obj[p]);
    }
  }
  return str.join('&');
}

The function of this function is to convert the object into a string, which does not perform URL encoding. Next, we can use this function to serialize the object into a query string, as shown below:

var queryString = Object.keys(data).map(function(key) {
  var value = data[key];
  if (typeof value === 'object') {
    value = serializeParam(value).replace(/%20/g, '+');
  }
  return encodeURIComponent(key) + '=' + value;
}).join('&');

// queryString 的值为：
// "name=John Doe&age=30&company=ABC Inc.&address[street]=123 Main St&address[city]=Anytown&address[state]=CA&address[zip]=12345"

As you can see, the query string generated by this method is not URL-encoded, but spaces are replaced. Became a plus. Therefore, if the server receiving the data can support this method of transmission, we can use this method.

In conclusion, by using a custom function, we can serialize objects in jQuery without URL encoding to meet our special needs.

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