java - 如果使用 selenium 未找到则跳过表

Question

我有与此非常相似的 html 代码:

<TH CLASS="ddtitle">MovieOne</TH>
        <TABLE  CLASS="datadisplaytable" ><CAPTION class="captiontext">Movies</CAPTION>
    <TR>
    <TH CLASS="ddheader" scope="col" >Genre</TH>
    <TH CLASS="ddheader" scope="col" >Time</TH>
    <TH CLASS="ddheader" scope="col" >Days</TH>
    <TH CLASS="ddheader" scope="col" >Where</TH>
    <TH CLASS="ddheader" scope="col" >Date Range</TH>
    <TH CLASS="ddheader" scope="col" >Seating</TH>
    <TH CLASS="ddheader" scope="col" >Actors</TH>
    </TR>
    <TR>
    <TD CLASS="dddefault">Action</TD>
    <TD CLASS="dddefault">10:00 am - 12:00 pm</TD>
    <TD CLASS="dddefault">SMTWTHFSA</TD>
    <TD CLASS="dddefault">AMC Showplace</TD>
    <TD CLASS="dddefault">Aug 20, 2014 - Sept 12, 2014</TD>
    <TD CLASS="dddefault">Reservations</TD>
    <TD CLASS="dddefault">Will Ferrel (<ABBR title= "Primary">P</ABBR>)  target="Will Ferrel" ></TD>
    </TR>
    </TABLE>
<TH CLASS="ddtitle">MovieTwo</TH>
        <TABLE  CLASS="datadisplaytable" ><CAPTION class="captiontext">Movies</CAPTION>
    <TR>
    <TH CLASS="ddheader" scope="col" >Genre</TH>
    <TH CLASS="ddheader" scope="col" >Time</TH>
    <TH CLASS="ddheader" scope="col" >Days</TH>
    <TH CLASS="ddheader" scope="col" >Where</TH>
    <TH CLASS="ddheader" scope="col" >Date Range</TH>
    <TH CLASS="ddheader" scope="col" >Seating</TH>
    <TH CLASS="ddheader" scope="col" >Actors</TH>
    </TR>
    <TR>
    <TD CLASS="dddefault">Action</TD>
    <TD CLASS="dddefault">11:00 am - 12:30 pm</TD>
    <TD CLASS="dddefault">SMTWTHFSA</TD>
    <TD CLASS="dddefault">Showplace Cinemas</TD>
    <TD CLASS="dddefault">Aug 20, 2014 - Sept 12, 2014</TD>
    <TD CLASS="dddefault">TBA</TD>
    <TD CLASS="dddefault">Zach Galifinakis (<ABBR title= "Primary">P</ABBR>)  target="Zach Galifinakis" ></TD>
    </TR>
    </TABLE>
<TH CLASS="ddtitle">MovieThree</TH>
<BR>
<BR>
Coming Soon
<BR>

我想要做的是获取与电影标题相关的单个表数据，如果电影没有表，我想说这些值是 TBA。到目前为止，我能够获取相关的表格信息，但无法跳过表格。例如，我使用此代码来获取电影的类型:

int tcounter = 1;

for (Element elements : li) {
WebElement genre = driver.findElement(By.xpath("//table[@class='datadisplaytable']/descendant::table["+tcounter+"]//td[1]"));
WebElement time = driver.findElement(By.xpath("//table[@class='datadisplaytable']/descendant::table["+tcounter+"]//td[2]"));
WebElement days = driver.findElement(By.xpath("//table[@class='datadisplaytable']/descendant::table["+tcounter+"]//td[3]"));
WebElement where = driver.findElement(By.xpath("//table[@class='datadisplaytable']/descendant::table["+tcounter+"]//td[4]"));
WebElement date_range = driver.findElement(By.xpath("//table[@class='datadisplaytable']/descendant::table["+tcounter+"]//td[5]"));
WebElement seating = driver.findElement(By.xpath("//table[@class='datadisplaytable']/descendant::table["+tcounter+"]//td[6]"));
WebElement actors = driver.findElement(By.xpath("//table[@class='datadisplaytable']/descendant::table["+tcounter+"]//td[7]"));
tcounter++;
}

元素是指存储网页上所有链接的列表([1] 的结果将是操作，[2] 的结果将是上午 10:00 - 中午 12:00 ...)。这是在 for 循环中，将 tcounter 的值增加 1，以便接收不同表的数据。有没有办法告诉程序查看 TH 类下是否存在表，如果不存在则给出值 TBA 并跳过它？

这是我根据 siking 的回答进行的第二次尝试:

List<WebElement> linstings = driver.findElements(By.className("ddtitle"));
    String genre = "";
    String time = "";
    String days = "";
    String where = "";
    String dateRange = "";
    String seating = "";
    String actors = "";
    for(WebElement potentialMovie : linstings) {
        try {
            WebElement actualMovie = potentialMovie.findElement(By.xpath("//table[@class='datadisplaytable']"));
            // System.out.println("Actual: " + actualMovie.getText());
            // make all your assignments, for example:
            type = actualMovie.findElement(By.xpath("/descendant::table//td")).getText();
            time = actualMovie.findElement(By.xpath("/descendant::table//td[2]")).getText();
            days = actualMovie.findElement(By.xpath("/descendant::table//td[3]")).getText();
            location = actualMovie.findElement(By.xpath("/descendant::table//td[4]")).getText();
            dates = actualMovie.findElement(By.xpath("/descendant::table//td[5]")).getText();
            schedType = actualMovie.findElement(By.xpath("/descendant::table//td[6]")).getText();
            instructor = actualMovie.findElement(By.xpath("/descendant::table//td[7]")).getText();
            System.out.println(genre+" "+time+" "+days+" "+where+" "+dateRange+" "+actors);

        } catch(Exception ex) {
            // there is no table, so:
            genre = "TBA";
        }
    }

此代码的问题是它只返回第一个表的值。

Answer 1

我将您的 HTML 示例缩减为以下内容:

<TH CLASS="ddtitle">MovieOne</TH>
<TABLE CLASS="datadisplaytable">
    <CAPTION class="captiontext">Movies</CAPTION>
    <TR>
        <TH CLASS="ddheader" scope="col">Genre</TH>
    </TR>
    <TR>
        <TD CLASS="dddefault">Action</TD>
    </TR>
</TABLE>
<TH CLASS="ddtitle">MovieTwo</TH>
<BR/>
<BR/>
Coming Soon
<BR/>
<TH CLASS="ddtitle">MovieThree</TH>
<TABLE CLASS="datadisplaytable">
    <CAPTION class="captiontext">Movies</CAPTION>
    <TR>
        <TH CLASS="ddheader" scope="col">Genre</TH>
    </TR>
    <TR>
        <TD CLASS="dddefault">Action</TD>
    </TR>
</TABLE>

希望它能够代表您的所有案例!

不要使用计数器，而是使用实际的 WebElement 进行迭代:

// default all your variables to TBA, like:
String genre = "TBA";

// find all the listings on the page...
List<WebElement> linstings = driver.findElements(By.className("ddtitle"));
// ... and iterate over them
for (WebElement listing : linstings) {

    // grab whatever is the _first_ element under the TH ...
    WebElement potentialMovie = listing.findElement(By.xpath("following-sibling::*[1]"));
    // ... check if it has a child element CAPTION
    if (potentialMovie.findElement(By.xpath("caption")) != null) {
        // make all your assignments, for example:
        genre = potentialMovie.findElement(By.xpath("tr[2]/td[1]")).getText();
    }
}

请注意，此代码未经测试，您的里程可能会有所不同!