Extracting values from a table row based on row data - JSoup

Question

I'm attempting to parse a HTML document using JSoup. What I am trying to do is extract the table data of a specific row. I want to be able to select said row using the value of the href attribute or the value of the <a></a> tags.

<tbody>
   <tr class="even">
      <td><a href="link-1">Link_1</a></td>
      <td align="center">9</td>
      <td align="center">9</td>
      <td align="center">2</td>
   </tr>
   <tr class="odd">
      <td><a href="link-2">Link_2</a></td>
      <td align="center">22</td>
      <td align="center">4</td>
      <td align="center">1</td>
   </tr>
   <tr class="even">
      <td><a href="link-3">Link_3</a></td>
      <td align="center">22</td>
      <td align="center">7</td>
      <td align="center">1</td>
   </tr>
</tbody>

Selecting the whole table is easy, I can just use the following:

Document htmlRawData = Jsoup.parse(deviceMetricData.toString());
Elements htmlMetrics = htmlRawData.select("tbody > tr > td[align]");

htmlMetrics.stream().forEach((ele) -> {
   System.out.println(ele.toString());
}); 

This is only ever ideal when the table has a single row. If it has many then selecting a specific row based on the value of the first cell becomes more tricky.

Can anyone help get me started or point me in the right direction?

Answer 1

Remember that can traverse through DOM tree.

If you only know that there will be always the same structure ( a inside td which is inside tr ) then you can make it as follows:

Element link = document.select("tbody > tr > td > a[href=\"link-1\"]").first();
link.parent().parent().children().forEach(System.out::println);

You can also filter all rows by occurence of this very href value:

final Elements rows = document.select("tbody > tr");
rows
    .stream()
    .filter(tr -> !tr.getElementsByAttributeValueMatching("href", "link-1").isEmpty())
    .findFirst()
    .map(Element::children)
    .ifPresent(System.out::println);

Or by using select:

final Elements rows = document.select("tbody > tr");
rows
    .stream()
    .filter(tr -> !tr.select("a[href=\"link-1\"").isEmpty())
    .findFirst()
    .map(Element::children)
    .ifPresent(System.out::println);