selenium webdriver 页面元素无法定位

zq584208781

上图中的写信控件如何定位，为什么我用xpath无法定位到呢，求大神指点。
WebElement sendmailEdit =  driver.findElement(By.xpath(".//*[@id='nav_send']"));
运行的时候报错:
org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"link text","selector":"写信"}
Command duration or timeout: 30.07 seconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.40.0', revision: 'fbe29a9', time: '2014-02-19 20:55:11'
System info: host: 'zhengq-PC', ip: '192.168.1.106', os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.8.0_11'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=20.0, platform=XP, browserConnectionEnabled=true, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
Session ID: 4da4d2f4-f288-4562-8abb-c26a1601712e
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:193)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:573)
at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:326)
at org.openqa.selenium.remote.RemoteWebDriver.findElementByLinkText(RemoteWebDriver.java:375)
at org.openqa.selenium.By$ByLinkText.findElement(By.java:242)
at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:318)
at mail21cn.SendMail.test_SendMail(SendMail.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.openqa.selenium.remote.ErrorHandler$UnknownServerException: Unable to locate element: {"method":"link text","selector":"写信"}
Build info: version: '2.40.0', revision: 'fbe29a9', time: '2014-02-19 20:55:11'
System info: host: 'zhengq-PC', ip: '192.168.1.106', os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.8.0_11'
Driver info: driver.version: unknown
at <anonymous class>.FirefoxDriver.prototype.findElementInternal_(file:///C:/Users/zhengq/AppData/Local/Temp/anonymous2451810447253103684webdriver-profile/extensions/fxdriver@googlecode.com/components/driver_component.js:8904)
at <anonymous class>.fxdriver.Timer.prototype.setTimeout/<.notify(file:///C:/Users/zhengq/AppData/Local/Temp/anonymous2451810447253103684webdriver-profile/extensions/fxdriver@googlecode.com/components/driver_component.js:396)

michaelbjw

顶楼上

joykao

首先你这个报错应该是由没找到写信这个链接引起的，至于你的xpath写的对不对这个就不知道了，推荐个chrome下的一个检查XPath的插件PsychoXPath,可以帮你确认xpath的值能否识别元素
org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"link text","selector":"写信"}