Discover the XPath of a post on a Facebook page with the help of HtmlUnit

I am trying to fetch the xpath of a Facebook post using HtmlUnit. To better understand my goal, you can check out these two related questions:

  1. Supernatural behaviour with a Facebook page
  2. HtmlUnit commenting out lines of Facebook page

To replicate my process, follow q-1. You can find the HTML code (of the Facebook page) on this pastebin link: http://pastebin.com/MfXsYSJQ.

Alternatively, you can visit . My objective is to retrieve the xpath of the span that contains the post with the text: "Hi! this is the first post of this page."

    public class ForStackOverflow {
        public static void main(String[] args) throws IOException {
            WebClient client=new WebClient(BrowserVersion.FIREFOX_17);
            client.getOptions().setJavaScriptEnabled(true);
            client.getOptions().setRedirectEnabled(true);
            client.getOptions().setThrowExceptionOnScriptError(true);
            client.getOptions().setCssEnabled(true);
            client.getOptions().setUseInsecureSSL(true);
            client.getOptions().setThrowExceptionOnFailingStatusCode(false);
            client.setAjaxController(new NicelyResynchronizingAjaxController());

            HtmlPage page1=client.getPage("https://www.facebook.com/bhramakarserver");
            System.out.println(page1.asXml());
            //getting the xpath of span of class="userContent"
            HtmlInput input=(HtmlInput)page1.getByXPath("/html/body//input[@type='submit']").get(0);
            System.out.println(input.asXml());
//This line gives error as the xpath evaluates to null
            HtmlSpan span=(HtmlSpan)page1.getByXPath("/html/body//span[@class='userContent']").get(0);
        }
    }

The issue seems to be that page1 contains static html. The particular span element:

<span data-ft="&#123;&quot;tn&quot;:&quot;K&quot;&#125;" class="userContent">Hi! this is the  first post of this page.</span>

is generated dynamically, causing it to appear as commented in the html of page1. However, upon inspection via inspect element, it displays normally. Is there a way to obtain the correct xpath after all dynamic content has been loaded on page1? Can this be achieved using Selenium Webdriver?

Answer №1

It appears from the given information that there may be an issue with an AJAX call not being triggered or a failure to properly wait for the AJAX request to complete. Past experiences have shown that relying on the AJAX controller can lead to suboptimal results. In such cases, using a loop might prove to be the most effective solution.

Detailed instructions on implementing this approach can be found in response to a similar query here: Get the changed HTML content after it's updated by Javascript? (htmlunit)

If this workaround does not resolve the issue, it is possible that a JavaScript exception is at play. I have shared some potential solutions for handling such exceptions in another post here: How to overcome an HTMLUnit ScriptException?

If all else fails, consider exploring alternatives to HTMLUnit. Utilizing a real browser driver or experimenting with tools like PhantomJS or ZombieJS could potentially yield better results.

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