jquery string conversion url encoding format

In front-end development, we often need to convert certain strings into URL encoding format. URL encoding is to convert some special characters into their corresponding ASCII codes so that they can be passed in the URL. Although JavaScript provides the encodeURI and encodeURIComponent methods that can be used to encode URLs, in some cases, we also need to use jQuery to implement this process. This article explains how to use jQuery to convert a string into URL-encoded format.

What is URL encoding?

URL encoding is a method of converting a string into a URL-safe format for passing in a URL. URL encoding converts some letters, numbers, and symbols into their ASCII equivalents, preceded by a percent sign. For example, the ASCII code for a space is 32, so in URL encoding the space will be converted to .

Common usage scenarios for URL encoding include:

• Passing special characters in URL parameters, such as &, =, etc.
• When sending data in an AJAX request, URL-encode the data for easier delivery.

Use jQuery to implement URL encoding

In jQuery, we can use the $.param() method to serialize an object into a URL encoding sequence ( This is also the default serialization method used by jQuery in AJAX requests). But what if we need to URL-encode a string? At this time we can use the encodeURIComponent() method to achieve it, which is the same as in JavaScript. For example, the following code can convert the string Hello, world! into URL encoding format:

var encoded = encodeURIComponent('Hello, world!');
console.log(encoded); // "Hello%2C%20world%21"

In the above code, the encodeURIComponent() method converts the comma and spaces are converted to , and .

Encapsulating URL encoding method

Now that we know how to use the encodeURIComponent() method in jQuery to perform URL encoding, we can encapsulate it into a function for convenience Reuse in code. For example, the following code:

function urlEncode(str) {
  return encodeURIComponent(str)
    .replace(/[!'()*]/g, function(c) {
      return '%' + c.charCodeAt(0).toString(16);
    });
}

In the above code, we first use the encodeURIComponent() method to URL encode the string, and then use regular expressions to encode some strings that are not in the URL encoding specification. Characters are converted to their ASCII codes. For example, !'()* characters are converted to !'()*.

Summary

In this article, we introduced the concept and usage scenarios of URL encoding, and showed how to use jQuery's $.param() method and encodeURIComponent() method to implement URL encoding. We also encapsulate the encodeURIComponent() method into a function to facilitate use in actual development. I hope this article will help everyone understand and use URL encoding.

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