How to convert XML data into objects in javascript

In front-end development, data interaction with the server is often involved. The data returned by the server is often transmitted in XML format. Therefore, it is very important for front-end developers to master the skills of converting XML data into objects.

This article will introduce how to use JavaScript to convert XML data into objects, hoping to provide some help to front-end developers when processing XML data.

1. Data in XML format

XML (Extensible Markup Language) is a commonly used data exchange format. It has good readability and scalability, so it is widely used on the Web. It has been widely used in applications. The following is an example of a simple XML file:

<?xml version="1.0" encoding="UTF-8"?>
<books>
  <book>
    <name>JavaScript高级程序设计</name>
    <author>Nicholas C. Zakas</author>
    <price>¥89.90</price>
  </book>
  <book>
    <name>JavaScript权威指南</name>
    <author>David Flanagan</author>
    <price>¥99.00</price>
  </book>
</books>

The above XML file contains information about two books, each book includes the title, author and price.

2. Basic steps for converting XML into objects

The basic steps for converting XML into objects are as follows:

1. Get XML data
2. Analysis XML data
3. Save the parsed object into a JavaScript object

Below we will introduce how to implement these steps step by step.

3. Obtain XML data

In this example, we use jQuery's ajax method to obtain XML data. The code is as follows:

$.ajax({
    type: "GET",
    url: "books.xml",
    dataType: "xml",
    success: function(xml) {
        console.log(xml);
    }
});

In the above code, we use the $.ajax method to obtain XML data. This method requires passing a JavaScript object containing some options. Among them, the type attribute specifies the type of request (here, GET), the url attribute specifies the URL address of the request, and the dataType attribute specifies the data type of the request.

When the request is successful, the success function will be called and passed a JavaScript object containing XML data. In this function, we use the console.log method to output XML data to the console.

4. Parse XML data

After obtaining the XML data, we need to parse it. In jQuery, you can use the $.parseXML method to parse XML data. This method accepts a string as parameter and returns a new XML document object. The code is as follows:

$.ajax({
    type: "GET",
    url: "books.xml",
    dataType: "xml",
    success: function(xml) {
        var xmlDoc = $.parseXML(xml),
            $xml = $(xmlDoc);
    }
});

In the above code, we first pass the obtained XML data as a parameter into the $.parseXML method to get a new XML document object. Then, we convert the document object into a jQuery object. This operation is mainly to facilitate us to use jQuery methods to manipulate XML data.

5. Save the parsed object into the JavaScript object

Finally, we save the parsed object into the JavaScript object. Here we define a books array to store information about each book. The code is as follows:

$.ajax({
    type: "GET",
    url: "books.xml",
    dataType: "xml",
    success: function(xml) {
        var xmlDoc = $.parseXML(xml),
            $xml = $(xmlDoc),
            books = [];

        $xml.find("book").each(function() {
            var book = {
                name: $(this).find("name").text(),
                author: $(this).find("author").text(),
                price: $(this).find("price").text()
            };
            books.push(book);
        });
        console.log(books);
    }
});

In the above code, we use the $xml.find method to find each book in the XML and use the .each method to iterate through each book. Within each book's loop, we use jQuery's .find method to get the title, author, and price and save them into a book object. Finally, we add this book object to the books array.

After getting the books array, we can use it to display data, perform subsequent operations, etc.

Summary

This article introduces how to use JavaScript to convert XML data into objects. This skill is very important for front-end developers, because front-end pages often need to obtain XML data from the server for display and operation.

In actual development, we may encounter some complex XML data structures, or need to convert XML data into more complex JavaScript objects. At this time, we need to analyze the structure of XML data in more detail and use more advanced techniques to complete these operations.

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