What is correct method to do multi level queries

[kinekt4]

I want to do multi level iterations.

ie. I want to select all the rows (tr). Iterate over each row. Then select the columns (td).

I can't see an easy way to do it with the methods available.

eg. Given the following html doc:

<table id="data-table">
  <tbody>
    <tr>
      <td>Row 1</td>
      <td>Col 1</td>
      <td>Col 2</td>
    </tr>
    <tr>
      <td>Row 2</td>
      <td>Col 1</td>
      <td>Col 2</td>
    </tr>
  </tbody>
</table>

To select the rows I would:

$rows = $fXml->query('table#data-table tr');

Now I want to select the columns based on the $rows result

Ideally, I was thinking along the lines of:

$rows->each(function($i, $domNode) {
    $cols = $this->query('td');
});

But I know that $this in the closure is a FluidContext object and doesn't have the query method.

Is there any other way to do it that I'm not aware of?

[daniele-orlando]

You have different options depending on the exact task you have to accomplish.

To iterate all rows and all columns, in batch, you can:

$rows = $fxml->query('//tr');
$cols = $fxml->query('//td');

$rows->each(function ($idx) {
});
$cols->each(function ($idx) {
});

To do a depth traversal (a row first, then its columns), you can:

$fxml->query('//tr')->each(function ($rowIdx) {
        $this->query('./td')->each(function ($colIdx) {
        });
});

But I know that $this in the closure is a FluidContext object and doesn't have the query method.

Exactly because it is a FluidContext, you have the ->query() method.

[kinekt4]

I didn't know you could do this:

$fxml->query('//tr')->each(function ($rowIdx) {
    $this->query('./td')->each(function ($colIdx) {
    });
});

For some reason I didn't think FluidContext had the query() method. I can now see it's implementing the FluidInterface which does indeed have the query() method.

I was doing this instead, which is not as efficient:

$fxml->query('//tr')->each(function ($rowIdx, $rDomNode) {

    $fxml = new FluidXml($rDomNode);
    $fxml ->query('./td')->each(function ($colIdx) {
        ...
    });
});