我正在努力使用 Selenium 下载 CSV 文件几天。请指教,不胜感激!!
我使用 Selenium Webdriver Language Bindings (Python) 2.4 + HTMLUnit 浏览器。
代码:
browser.find_element_by_id("generate_csv").click()
csv_file = browser.page_source
在那个网页中,如果我使用 Firefox,点击“generate_csv”按钮后,它会生成一个 CSV 文件,通常会下载它。由于我使用的是 HTMLUnit,所以很难实现下载文件,所以我使用page_source
属性来获取 CSV 内容。
有时,它是成功的!但有时它会抛出错误:
org.openqa.selenium.NoSuchElementException: Returned node was not an HTML element
有人可以帮我分析为什么会这样吗?我很困惑,运行脚本就像掷骰子。
谢谢你。
更新:(回溯的一部分)
14:29:15.913 INFO - Executing: [find element: By.selector: .controlbuttons > a > img[alt='CSV']])
14:29:16.404 WARN - Exception thrown
org.openqa.selenium.NoSuchElementException: Returned node was not an HTML element
For documentation on this error, please visit: ...
Driver info: driver.version: EventFiringWebDriver
at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElementByCssSelector(HtmlUnitDriver.java:952)
at org.openqa.selenium.By$ByCssSelector.findElement(By.java:426)
at org.openqa.selenium.htmlunit.HtmlUnitDriver$5.call(HtmlUnitDriver.java:1565)
at org.openqa.selenium.htmlunit.HtmlUnitDriver$5.call(HtmlUnitDriver.java:1)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.implicitlyWaitFor(HtmlUnitDriver.java:1241)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElement(HtmlUnitDriver.java:1562)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElement(HtmlUnitDriver.java:530)
at sun.reflect.GeneratedMethodAccessor129.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.openqa.selenium.support.events.EventFiringWebDriver$2.invoke(EventFiringWebDriver.java:101)
at com.sun.proxy.$Proxy14.findElement(Unknown Source)
at org.openqa.selenium.support.events.EventFiringWebDriver.findElement(EventFiringWebDriver.java:184)
at org.openqa.selenium.remote.server.handler.FindElement.call(FindElement.java:47)
at org.openqa.selenium.remote.server.handler.FindElement.call(FindElement.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession.java:169)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)
14:29:16.405 WARN - Exception: Returned node was not an HTML element