Alternating rows background depending a changing value in Laravel - php

Question

Here is a blade template of my table, where I have issues changing rows depending on a value. If the command number changes I want the row and all the following rows with that command number to change and then alternate between white/grey colors everytime it's a different one.
I know it looks pretty basic but I can't make the condition in my algorithm. My first if looks if the previous iteration has a different command number and change the class, but I'm missing the one checking if the previous iteration has the same command number so keep the same background. I don't know how to check something css class and alternate the 2 backgrounds white/grey. I tried with $attributes from Laravel but it is always undefined.
I hope I was clear with my issue, also the table is already sorted by increasing command_number.
If you need the controller I can provide it.
Thanks
tr.second th, tr.second td {
background-color: #D1D1D1;
}
//////
<tbody>
#foreach($data as $key => $line)
#if($key > 0)
<tr #if ($data[$key]['command_number'] != $data[$key-1]['command_number']) class="second"
#elseif()
#endif>
#foreach($line as $item)
#if(($item == $line['quantity']) || ($item == $line['delivery']))
<td>
<strong>{{$item}}</strong>
</td>
#elseif($item == $line['hours'])
<td>
<strong style="color: red;">{{$item}}</strong>
</td>
#else
<td>
{{$item}}
</td>
#endif
#endforeach
</tr>
#endif
#endforeach
</tbody>

Answer 1

If you want to change the class based on a previous result, why don't you track the css class to use with a toggle variable outside of the loop like so:
// in your blade file
#php
$toggle = false;
#endphp
#foreach(range(0, 10) as $number)
<div class="#if($toggle) someClass #else otherClass #endif unrelatedClasses">
</div>
#php
$toggle = !$toggle
#endphp
#endforeach
Alternatively, the toggle should function in your case:
// You could change the value of toggle based on your use case, like:
#php
$toggle = ($data[$key]['command_number'] != $data[$key-1]['command_number']);
#endphp
Instead of using $key, you can also use $loop->index to get the current iteration.
Loop variable for even/odd cases
For other use cases, the loop variable has several properties and methods you can use (like even, odd). Check out the Blade documentation.
CSS selector for even/odd cases
There are also CSS solutions using selectors like: nth-child(even) and nth-child(odd) for even and odd numbers respectively.

Answer 2

<tbody>
#php($currentKey = null)
#foreach($data as $key => $line)
#if($key > 0)
<tr #if ($data[$key]['command_number'] != $currentKey) class="second"
#elseif()
#endif>
#foreach($line as $item)
#if(($item == $line['quantity']) || ($item == $line['delivery']))
<td>
<strong>{{$item}}</strong>
</td>
#elseif($item == $line['hours'])
<td>
<strong style="color: red;">{{$item}}</strong>
</td>
#else
<td>
{{$item}}
</td>
#endif
#endforeach
</tr>
#endif
#php($currentKey = $data[$key]['command_number'])
#endforeach
</tbody>