How to solve the garbled value passed by jquery url

With the development of Web technology, front-end frameworks have become an indispensable part of developing Web applications, among which jQuery is also one of the most popular front-end frameworks currently. In development, it is often necessary to pass parameters to the backend through the URL. However, when using jQuery, sometimes the URL value transmission is garbled. So, how did this problem arise and how to solve it?

1. URL pass-by-value

First, let’s understand what URL pass-by-value is. URL (Uniform Resource Locator, Uniform Resource Locator) is a standard resource address on the Internet, usually in the form:

protocol://hostname[:port]/path/?query

where , query is the value-passed part of the URL. It will be automatically brought when the browser sends a request so that the back-end program can obtain the data requested by the user.

In actual development, we can use jQuery's AJAX method to pass the URL value, as shown below:

$.ajax({
    type: "GET",
    url: "test.php",
    data: { name: "John", age: 25 }
});

In this code, we send the value to test.php through the GET method A request is made, and two parameters name and age are passed in the URL, which are John and 25 respectively.

2. The problem of garbled URL value transmission

If our parameter value itself contains Chinese or other special characters, then there may be a problem of garbled URL value transmission. For example, if we set the value of name to Zhang San, then the request URL sent will become:

test.php?name=Zhang San&age=25

This Zhang San is Zhang San encoded using UTF-8. However, sometimes we will find that the parameter values ​​passed in the URL are garbled, for example:

test.php?name=���&age=25

In this case, The background is likely to be unable to parse the parameters correctly, resulting in an exception in the program. So, how did this problem arise and how to solve it?

In fact, the reason for this problem is very simple. It is because jQuery uses UTF-8 encoding by default when transferring URL values, and the background program may not be able to correctly parse the encoding. Therefore, when other encoding methods are used in the background, the parameter values ​​will be garbled.

3. Solution to garbled URL value transmission

So, how to solve the problem of garbled URL value transmission? Two solutions are introduced below.

1. Manual encoding

First of all, we can use JavaScript's encodeURIComponent() method to manually encode, as shown below:

var name = "张三";
var age = 25;
var url = "test.php?name=" + encodeURIComponent(name) + "&age=" + age;
$.ajax({
    type: "GET",
    url: url
});

In this way, we can encode special characters such as Chinese Characters are encoded correctly to avoid the problem of garbled URL values.

2. Set the default encoding

Secondly, we can also solve this problem by setting the default encoding of jQuery. Specifically, set the contentType attribute to application/x-www-form-urlencoded, as shown below:

$.ajaxSetup({
    contentType: "application/x-www-form-urlencoded; charset=UTF-8"
});

In this way, jQuery will use UTF-8 encoding by default and encode the parameters. The value is passed to the background through the URL to ensure that the background program can correctly parse the parameters and avoid the problem of garbled URL value transmission.

Generally speaking, garbled URL values ​​are a common problem in jQuery development, but in fact, you can easily solve this problem by spending a little time understanding the encoding rules. I hope this article can be helpful to everyone.

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