我试图弄清楚如何在 Seleniumn::Remote::Driver 的 Perl 模块中正确使用 XPATH。具体来说，我有一个 HTML 表单，其中包含各种输入字段，其中 2 个输入字段具有相同的值。我想根据它的“值”选择第二个输入字段（这个值在两个输入字段中是相同的）。我已经在 Selenium IDE(1.10.0) 中尝试过这个，它将目标显示为：
xpath=(//input[@value='clickhere'])[2]
我试图在使用 Selenium::Remote::Driver 模块的 Perl 脚本中模拟这种行为。
$elem = $driver->find_element("xpath=(//input[\@value='clickhere'][2])");
$driver->mouse_move_to_location(element => $elem, xoffset => 0, yoffset => 0);
$driver->click;
这不起作用并引发错误（见下文）。我认为错误与“[2]”部分有关，因为我通常能够在 HTML 表单中选择具有唯一“值”的元素。将 xpath 编码到 find_element 函数中的正确方法是什么，以便它选择并单击 HTML 表单中的第二个元素，其中第一个和第二个元素的值都为“cickhere”？
Error while executing command: Argument was an invalid selector (e.g. XPath/CSS).: The given selector xpath=(//input[@value='click'][2]) is either invalid or does not result in a WebElement. The following error occurred:
InvalidSelectorError: Unable to locate an element with the xpath expression xpath=(//input[@value='clickhere'][2]) because of the following error:
[Exception... "The expression cannot be converted to return the specified type." code: "0" nsresult: "0x805b0034 (TypeError)" location: "file:///C:/Temp/anonymous6984397347674679222webdriver-profile/extensions/fxdriver@googlecode.com/components/driver_component.js Line: 5696"]
Command duration or timeout: 16 milliseconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/invalid_selector_exception.html
Build info: version: '2.30.0', revision: 'dc1ef9c', time: '2013-02-19 00:15:27'
System info: os.name: 'Windows XP', os.arch: 'x86', os.version: '5.1', java.version: '1.7.0_11'
Session ID: ce542470-8a3a-41da-a73a-2a55275290d3
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{platform=XP, databaseEnabled=true, cssSelectorsEnabled=true, javascriptEnabled=true, acceptSslCerts=true, handlesAlerts=true, browserName=firefox, browserConnectionEnabled=true, nativeEvents=true, webStorageEnabled=true, rotatable=false, locationContextEnabled=true, applicationCacheEnabled=true, takesScreenshot=true, version=19.0}] at C:\Perl\scripts\frontend\createAccount.pl line 144.