我正在尝试单击此站点中的搜索按钮：http ://www.amadeusepower.com/trek/portals/trek/default.aspx?Culture=en-US
但它显然无法点击它，因为返回的页面与旧页面相同。它需要返回一个显示此搜索结果的页面。
我尝试了 htmlunitscripter，但它似乎不知道我点击了该按钮并且它没有为其生成代码。我试过了 ：
HtmlElement theElement5 = (HtmlElement) page.getElementById("ctl00_ctl00_ctl00_cph1_cph1_QuickSearchAll1_QuickFlightSearchControl1_btnSearch");
page = (HtmlPage) theElement5.click();
但它不起作用（返回旧页面）。我在 selenium 中尝试了下一个代码并且它工作但我不能使用 selenium，因为当我尝试在 Web 服务中使用它时它引起的问题。
WebElement searchbutton = driver.findElement(By.id("ctl00_ctl00_ctl00_cph1_cph1_QuickSearchAll1_QuickFlightSearchControl1_btnSearch"));
searchbutton.click();
如何在 htmlunit 中访问此按钮？我没有尝试 xpath，因为我不知道如何使用它获取元素。有人可以看看该网站并提出解决方案以达到并单击此按钮吗？
编辑：
当我尝试这个时
page.executeJavaScript("var elem = document.getElementById('ctl00_ctl00_ctl00_cph1_cph1_QuickSearchAll1_QuickFlightSearchControl1_btnSearch'); elem.click();");
它抛出这个异常。
May 29, 2013 8:23:41 PM com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine handleJavaScriptException
INFO: Caught script exception
======= EXCEPTION START ========
EcmaError: lineNumber=[1] column=[0] lineSource=[<no source>] name=[TypeError] sourceName=[injected script] message=[TypeError: Cannot find function click in object [object HTMLSpanElement]. (injected script#1)]
com.gargoylesoftware.htmlunit.ScriptException: TypeError: Cannot find function click in object [object HTMLSpanElement]. (injected script#1)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:669)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:601)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:555)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:530)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:979)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScript(HtmlPage.java:947)
at eko.htmlunit.ekoht.main(ekoht.java:63)
Caused by: net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot find function click in object [object HTMLSpanElement]. (injected script#1)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3603)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3587)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3608)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3624)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.notFunctionError(ScriptRuntime.java:3688)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThisHelper(ScriptRuntime.java:2207)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2189)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1333)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:405)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:275)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3031)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:546)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:654)
... 7 more
Enclosed exception:
net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot find function click in object [object HTMLSpanElement]. (injected script#1)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3603)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3587)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3608)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3624)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.notFunctionError(ScriptRuntime.java:3688)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThisHelper(ScriptRuntime.java:2207)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2189)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1333)
at script(injected script:1)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:405)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:275)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3031)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:546)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:654)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:601)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:555)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:530)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:979)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScript(HtmlPage.java:947)
at eko.htmlunit.ekoht.main(ekoht.java:63)
======= EXCEPTION END ========
显然它找不到元素的点击功能。还能做什么？