我如何有效地点击一个HtmlCell使用Java/HtmlUnit?

Question

如果你去https://taxtest.navajocountyaz.gov/Pages/WebForm1.aspx?p=1&apn=205-27-014查看页面源并在页面源中搜索grdCPhist，您将找不到它。

但是，如果您单击Taxes，然后单击第5行第7列的CP，然后查看页面源代码，您将发现一个grdCPhist。有一个id=" grdphp "的表

我想从Java代码中使用HtmlUnit访问这个表。

为此，我开发了下面的程序:

import com.gargoylesoftware.htmlunit.*;
import com.gargoylesoftware.htmlunit.html.*;
import com.gargoylesoftware.htmlunit.javascript.*;
import java.io.*;
public class ClickOnCell {
public static void ClickOnCell () {
try (final WebClient webClient = new WebClient()) {
System.getProperties().put("org.apache.commons.logging.simplelog.defaultlog", "fatal");
webClient.getOptions().setThrowExceptionOnScriptError(false);
webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
webClient.getOptions().setCssEnabled(false);
webClient.setJavaScriptErrorListener(new SilentJavaScriptErrorListener());
webClient.setCssErrorHandler(new SilentCssErrorHandler());
HtmlPage page = webClient.getPage("http://taxtest.navajocountyaz.gov/Pages/WebForm1.aspx?p=1&apn=205-27-014");
webClient.waitForBackgroundJavaScriptStartingBefore(10000);
page = (HtmlPage) page.getEnclosingWindow().getEnclosedPage();
webClient.getOptions().setThrowExceptionOnScriptError(false);
webClient.setJavaScriptErrorListener(new SilentJavaScriptErrorListener());
HtmlTable grdTaxHistory = (HtmlTable) page.getElementById("grdTaxHistory");
HtmlTableDataCell cpCell = (HtmlTableDataCell) grdTaxHistory.getCellAt(4,6);
System.out.println("cpCell.getTextContent() = " + cpCell.getTextContent());
cpCell.click();
webClient.waitForBackgroundJavaScriptStartingBefore(1000000000);
page = (HtmlPage) page.getEnclosingWindow().getEnclosedPage();
HtmlTable grdCPHistory = (HtmlTable) page.getElementById("grdCPhist");
System.out.println("grdCPHistory = " + grdCPHistory);
}
catch (Exception e) {
System.out.println("Error: "+ e);
}
}
public static void main(String[] args) {
File file = new File("validParcelIDs.txt");
ClickOnCell();
}
}

我使用以下两个命令编译并运行程序:

javac -classpath ".:/opt/htmlunit_2.69.0/*" ClickOnCell.java
java -classpath ".:/opt/htmlunit_2.69.0/*" ClickOnCell

程序编译良好。没有错误或警告。然而，当我运行程序时，我在屏幕上得到了以下输出:

WARNING: Obsolete content type encountered: 'text/javascript'.
Jan 13, 2023 5:51:29 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Jan 13, 2023 5:51:29 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Jan 13, 2023 5:51:30 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Jan 13, 2023 5:51:30 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'application/x-javascript'.
Jan 13, 2023 5:51:30 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Obsolete content type encountered: 'text/javascript'.
cpCell.getTextContent() =                                                                     
CP

grdCPHistory = null

我在上面不高兴的是grdCPHistory表等于null。这告诉我，HtmlUnit是无法找到表与id=" grdcphp "，好像我没有把cpCell.click();在代码中

我如何改变上面的代码能够访问，从我的Java程序，与id=" grdphp "表?

由于StackOverflow不允许我在你建议我尝试什么之后感谢你，所以提前感谢。

Answer 1

单击单元格没有效果，因为操作是从包含锚点触发的。

<td align="right">                                                                    
<a onclick="$('#');" id="grdTaxHistory_lnkViewPayments_4" href="javascript:__doPostBack('grdTaxHistory$ctl06$lnkViewPayments','')">$2948.15</a>
</td>

你必须选择锚点并点击它。

String url = "http://taxtest.navajocountyaz.gov/Pages/WebForm1.aspx?p=1&apn=205-27-014";
try (final WebClient webClient = new WebClient(BrowserVersion.FIREFOX)) {
webClient.getOptions().setThrowExceptionOnScriptError(false);
webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
webClient.getOptions().setCssEnabled(false);
// don't disable logging if your are hunting for problems
webClient.setJavaScriptErrorListener(new SilentJavaScriptErrorListener());
HtmlPage page = webClient.getPage(url);
webClient.waitForBackgroundJavaScriptStartingBefore(1_000);
page = (HtmlPage) page.getEnclosingWindow().getEnclosedPage();
// System.out.println("-----------------------------------------------------");
// System.out.println(page.asNormalizedText());
// System.out.println("-----------------------------------------------------");

// no need to click - the table is already there, only not visible
// page.getAnchorByText("Taxes").click();
// webClient.waitForBackgroundJavaScriptStartingBefore(1_000);
// page = (HtmlPage) page.getEnclosingWindow().getEnclosedPage();
// System.out.println("-----------------------------------------------------");
// System.out.println(page.asNormalizedText());
// System.out.println("-----------------------------------------------------");

HtmlTable grdTaxHistory = (HtmlTable) page.getElementById("grdTaxHistory");
HtmlTableDataCell cpCell = (HtmlTableDataCell) grdTaxHistory.getCellAt(4,6);
// System.out.println("cpCell.getTextContent() = " + cpCell.getTextContent().trim());
// the action is triggered by the anchor inside the cell
// todo this is a hack - make finding the enclosing anchor more robust
((HtmlAnchor) cpCell.getFirstChild().getNextSibling()).click();
webClient.waitForBackgroundJavaScriptStartingBefore(1_000);
page = (HtmlPage) page.getEnclosingWindow().getEnclosedPage();
HtmlTable grdCPHistory = (HtmlTable) page.getElementById("grdCPhist");
System.out.println("-----------------------------------------------------");
System.out.println(grdCPHistory.asNormalizedText());
System.out.println("-----------------------------------------------------");
}