How Can I Access JavaScript-Generated Content with JSoup?

JSoup and JavaScript-Generated Content

When parsing web pages with JSoup, it's important to remember that JSoup is an HTML parser, not a browser engine. This means it doesn't execute JavaScript and any content that is dynamically added to the page after the initial page load is invisible to JSoup.

For example, if you need to parse a page that dynamically adds tags to a div element using JavaScript, JSoup won't be able to capture that content. The element itself may be present in the HTML source code, but the tags added by JavaScript will not be available to JSoup.

Accessing JavaScript-Generated Content

To access content that is added to the page by JavaScript, you need to use a tool that can emulate a browser environment. There are several Java libraries that can do this, such as:

• [Selenium](https://www.selenium.dev/)
• [HtmlUnit](https://htmlunit.sourceforge.io/)
• [JBrowserDriver](https://github.com/JBrowserDriver/JBrowserDriver)

These libraries allow you to create a virtual browser instance and interact with the web page as if it were being rendered in a real browser. This enables you to execute JavaScript, trigger events, and access the dynamically added content.

Example Using Selenium

Here's an example using Selenium to get the JavaScript-generated content from the page you referenced:

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;

public class SeleniumExample {
    public static void main(String[] args) {
        // Set up the WebDriver
        System.setProperty("webdriver.chrome.driver", "/path/to/chromedriver");
        WebDriver driver = new ChromeDriver();

        // Load the web page
        driver.get("http://www.bestreferat.ru/referat-32558.html");

        // Wait for the div element to be filled with JavaScript
        WebElement tagsList = driver.findElement(By.id("tags_list"));
        WebDriverWait wait = new WebDriverWait(driver, 10);
        wait.until(ExpectedConditions.visibilityOf(tagsList));

        // Get the tags from the div element
        List<WebElement> tags = tagsList.findElements(By.tagName("a"));

        // Print the tags
        for (WebElement tag : tags) {
            System.out.println(tag.getText());
        }

        // Close the WebDriver
        driver.close();
    }
}

This example uses Selenium to load the web page, wait for the JavaScript-generated content to be added, and then retrieve the tags from the div element.

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