如何使用Selenium Python单击元素

如何解决如何使用Selenium Python单击元素

所以我在HTML中有这个元素...

<a href="#" onclick="on_catolog(2);"><span style="font-size:11pt">Security</span></a>

...，我想在python中使用Selenium单击它。我该怎么做？ （也许我可以使用onclick来识别它，但是如何？）

此外，这是我尝试过的：

security = driver.find_element_by_xpath("//button[@onclick=\"on_catolog(2);\"]")
security.click()

解决方法

您在XPath org.renjin.eval.EvalException: java.lang.NullPointerException at org.renjin.eval.Context.evaluateCall(Context.java:416) at org.renjin.eval.Context.evaluate(Context.java:282) at org.renjin.eval.Context.evaluate(Context.java:264) at org.renjin.eval.Context.evaluateExpressionVector(Context.java:390) at org.renjin.eval.Context.evaluate(Context.java:280) at org.renjin.eval.Context.evaluate(Context.java:264) at org.renjin.script.RenjinScriptEngine.eval(RenjinScriptEngine.java:168) at org.renjin.script.RenjinScriptEngine.eval(RenjinScriptEngine.java:127) at de.bayern.statistik.zensus2021.hhgen.worker.modul5.common.renjin.example.RenjinQuickStartTest.renjinTestModellTest(RenjinQuickStartTest.java:332) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53) Caused by: java.lang.NullPointerException at org.renjin.primitives.Conditions.signalCondition(Conditions.java:210) at org.renjin.eval.EvalException.initContext(EvalException.java:66) at org.renjin.eval.ClosureDispatcher.apply(ClosureDispatcher.java:85) at org.renjin.eval.ClosureDispatcher.applyClosure(ClosureDispatcher.java:50) at org.renjin.sexp.Closure.apply(Closure.java:83) at org.renjin.eval.Context.evaluateCall(Context.java:407) ... 33 more 中使用了错误的标记名称。它不是按钮，而是锚标记。试试

"//button[@onclick=\"on_catolog(2);\"]"

或单击按链接文本：

"//a[@onclick='on_catolog(2);']"

,

要单击文本为安全性的元素，可以使用以下任一Locator Strategies：

• 使用css_selector：

  driver.find_element_by_css_selector("a[onclick^='on_catolog'] > span[style='font-size:11pt']").click()
  

• 使用xpath：

  driver.find_element_by_xpath("//a[starts-with(@onclick,'on_catolog')]/span[text()='Security']").click()
  

---

理想情况下，要单击element_to_be_clickable()的{​​{3}}元素，可以使用以下WebDriverWait之一：

• 使用CSS_SELECTOR：

  WebDriverWait(driver,20).until(EC.element_to_be_clickable((By.CSS_SELECTOR,"a[onclick^='on_catolog'] > span[style='font-size:11pt']"))).click()
  

• 使用XPATH：

  WebDriverWait(driver,20).until(EC.element_to_be_clickable((By.XPATH,"//a[starts-with(@onclick,'on_catolog')]/span[text()='Security']"))).click()
  

• 注意：您必须添加以下导入：

  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support import expected_conditions as EC