java - 稳定元素引用异常 : Element not found in the cache - perhaps the page has changed since it was looked up

Question

我的代码如下，代码是通过xpath获取设置的元素，生成一个list<String>与元素集中每个元素的文本。但是在将每个元素的文本添加到新的 List<String> 的过程中总是抛出异常.

protected List<String> getHeaders(String path){
    List<String> headers = new ArrayList<String>();
    int count = 0;
    List<WebElement> elements = findAllByXpath(path);
    LOG.info("The length is : " + String.valueOf(elements.size()));

    for (WebElement c: elements) {
        LOG.info("->> " + String.valueOf(count));
        count++;
        headers.add(c.getText());
    }
    return headers;
}

结果是:

INFO com.xxx.test - The length is: 13
INFO com.xxx.test ->> 0
INFO com.xxx.test ->> 1
INFO com.xxx.test ->> 2
INFO com.xxx.test ->> 3
INFO com.xxx.test ->> 4
INFO com.xxx.test ->> 5

com.xxx.test -> getHeaders FAILED org.openqa.selenium.StableElementReferenceException:Element not found in the cache - perhaps the page has changed since it was looked up

在这种情况下有人可以提供帮助吗？谢谢!

Answer 1

我看到了 3 种方法来处理您的问题。

第一个也是最可靠的解决方案是在页面达到稳定状态后查找元素。这可以通过等待元素的存在或等待元素的计数来完成。

第二种解决方案是在引发 StableElementReferenceException 时再次列出元素:

List<String> headers = new ArrayList<String>();
List<WebElement> elements = findAllByXpath(path);
for(int i = 0; i < elements.size(); ) {
  try {
    headers.add(elements.get(i).getText());
    i++;
  } catch (StableElementReferenceException ex) {
    elements = findAllByXpath(path);
  }
}
return headers;

第三种解决方案是使用一段 Javascript 获取所有元素的文本:

List<WebElement> elements = findAllByXpath(path);

ArrayList headers = (ArrayList)((JavascriptExecutor)driver).executeScript(
    "var arr = [], elements = arguments[0];" +
    "for(var i=0; i<elements.length; i++)" +
    "  arr.push(elements[i].textContent);" +
    "return arr;", elements);

return headers;