SyntaxError：无法在'Document'上执行'evaluate'：字符串'// div [contains（。，'Medium'）&

Posted 2021-04-29

我使用硒尝试获取html中的div类值，但是我遇到了如下问题

invalid selector: Unable to locate an element with the xpath expression //div[contains(., 'Medium') because of the following error:
SyntaxError: Failed to execute 'evaluate' on 'Document': The string '//div[contains(., 'Medium')' is not a valid XPath expression.

下面是我的html和读取html值的代码。

HTML：

<< img src =“ https://image.soinside.com/eyJ1cmwiOiAiaHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9BdXAydy5wbmcifQ==” alt =“在此处输入图像描述”>

代码试用：

IWebElement element = driver.FindElement(By.XPath("//div[contains(., 'Medium')"));
String text =   element.GetAttribute("text");
Console.WriteLine(text);

答案

此错误消息...

invalid selector: Unable to locate an element with the xpath expression //div[contains(., 'Medium') because of the following error:
SyntaxError: Failed to execute 'evaluate' on 'Document': The string '//div[contains(., 'Medium')' is not a valid XPath expression.

...表示您使用的XPath不是有效的XPath表达式。

---

你是如此亲密。您在构造]时错过了结束符xpath。

有效地，您的代码行将是：

IWebElement element = driver.FindElement(By.XPath("//div[contains(., 'Medium')]"));
参考

您可以在以下位置找到几个相关的相关讨论：

• selenium - Failed to execute 'evaluate' on 'Document': The string is not a valid XPath expression
• SyntaxError: Failed to execute 'evaluate' on 'Document': The string '//img[contains('1236548597')]' is not a valid XPath expression

另一答案

您的xpath表达式少了]：