dsi*_*ler 6 java selenium selenium-chromedriver selenium-webdriver
我测试的页面上的元素如是否//img或//i有alt属性。
我找不到一种方法来检测该属性何时根本不存在。
这是 WebElement。只是一个没有 alt 属性的 img。
<img class="gsc-branding-img" src="https://www.google.com/cse/static/images/1x/googlelogo_grey_46x15dp.png" srcset="https://www.google.com/cse/static/images/2x/googlelogo_grey_46x15dp.png 2x"/>
这是我试图确定 alt 是否存在的代码。我知道这不是全部必要的，我只是在尝试一切。
WebElement we == driver.findElement(By.xpath("(//img)[1]"));
String altAttribute = we.getAttribute("alt");
if(altAttribute == null || altAttribute =="" || altAttribute == " ")
{
//attribute not found
}
好像是返回一个空字符串...例如下面的代码返回“beforeAfter”
System.out.println("before"+altAttribute+"After");
但是，我的if语句没有赶上返回，所以我不知道该怎么办。
if the attribute is not present, it should return null, if it's present and not set then it will return empty string. I think that's the case in your example, if so. Then you should use equal method to compare string rather than == operator.
Below example is about google search box, xxx attribute is not present for search box and so it will return null
driver = new ChromeDriver();
driver.get("http://google.com");
WebElement ele = driver.findElement(By.name("q"));
String attr = ele.getAttribute("xxx");
if (attr == null){
System.out.print("Attribute does not exist");
}
else if (attr.equals("")){
System.out.print("Attribute is empty string");
}
You can try it out yourself by writing the following html and saving it as test. html:
<html>
<head>
</head>
<body>
<p id="one">one</p>
<p id="two" data-se="">two</p>
<p id="three" data-se="something">three</p>
</body>
</html>
Then write a web driver script that looks like this:
driver.get("file:///<PATH_TO_HTML_ABOVE>/test.html");
WebElement one = driver.findElement(By.id("one"));
WebElement two = driver.findElement(By.id("two"));
WebElement three = driver.findElement(By.id("three"));
System.out.println("Does one have the data-se attribute?: '" + one.getAttribute("data-se") + "'");
System.out.println("Does two have the data-se attribute?: '" + two.getAttribute("data-se") + "'");
System.out.println("Does three have the data-se attribute?: '" + three.getAttribute("data-se") + "'");
Which will give you the following output:
Does one have the data-se attribute?: 'null'
Does two have the data-se attribute?: ''
Does three have the data-se attribute?: 'something'
您应该使用选择器列出缺少属性的元素，而不是检查属性：
List<WebElement> elems = driver.findElements(By.cssSelector("img:not([alt])"));
if (elems.size() > 0) {
// found images with alt attribute missing
}
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