如何使用Selenium提取xml：lang值

Question

I have the HTML tag like:

html xmlns = " http://www.w3.org/1999/xhtml "  xml:lang=' en-US '  lang='en-US '

By using selenium I am getting value of lang attribute, but while retrieving value of xml:lang getting null.

htmlTag.getAttribute("lang"); //en-US
htmlTag.getAttribute("xml:lang"); //null

Does anyone knows how to get value of xml:lang ?

Answer 1

It should work if this attribute presents and return null if it's not there. As the name indicates, this attribute gives directives for XML documents, you wouldn't find it in the majority of the websites (eg stackoverflow, google, facebook). Normally you should retrieve it the same way you do for the rest of attributes, eg:

String xmlLang = driver.findElement(By.tagName("html")).getAttribute("xml:lang");

You can check if an attribute exists with the following method:

private static boolean attributeExists(WebElement elem, String attr) {
    return elem.getAttribute(attr) != null;
}

Note that for HTML pages, Selenium does not return null for a missing lang attribute, but it returns an empty String . For instance, at the time I am writing this post, StackOverflow.com does not include the lang and xml:lang in its served html-source.

But, Selenium will return null for xml:lang and an empty String for lang ; thus, as a false-positive case, the aforementioned method attributeExists will return true for a non-existing lang attribute.