如何在xpath中选择具有空文本后代的元素？

Question

PAGE - facebook

I want print all friends online on the facebook (name, link to messenger), but I have a problem. I don't any idea. How can I get elements which contains two attributes:

1. "//li[@class='_42fz']/a"
2. "class='_568-'" without text (if div of the class="_568-"/ is without text it means that friend is online).

My code is:

List<WebElement> friendElements = driver.findElements(By.xpath("//li[@class='_42fz']/a"));

But I want elements with only friends online.

Example of code:

<li id="js_pq" class="_42fz" data-id="101022398278367" aria-controls="js_po" aria-haspopup="true" aria-describedby="js_pp">
<a class="_55ln _qhr" href="https://web.facebook.com/messages/t/107022338465367" rel="ignore">
<div class="_55lp">
<div class="_55lq" aria-hidden="true">
<div class="_5bon">
<div class="_568z">
<div class="_568-">1d</div>
</div>
</div>
<div class="_55lr">Jan Kowalski</div>
<div class="_55ls"/>
</div>
</a>
</li>
<li id="js_pq" class="_42fz" data-id="101012398278367" aria-controls="js_po" aria-haspopup="true" aria-describedby="js_pp">
<a class="_55ln _qhr" href="https://web.facebook.com/messages/t/290222338565367" rel="ignore">
<div class="_55lp">
<div class="_55lq" aria-hidden="true">
<div class="_5bon">
<div class="_568z">
<div class="_568-"></div>
</div>
</div>
<div class="_55lr">Kowalski Jan</div>
<div class="_55ls"/>
</div>
</a>
</li>

And in this case my program must get friend name and href to messenger from the second li, because div of class _568- is without text, it means that this friend is online. If this div has text for example <div class="_568-">1d</div> it means that friend isn't online.

Answer 1

The html snippet that you pasted is invalid XML, so YMMV , but this should select what you are looking for:

//li[@class='_42fz']//div[@class='_568-'][not(text())]/../../../../../a/@href

or more elegant:

//li[@class='_42fz'][descendant::div[@class='_568-'][not(text())]]/a/@href

DEMO