display data for every n-th data using clistview - php

Question

how can i display data for every let's say odd entry?
So first record Z, second record do Y, third record do Z, fourth do Y.
or lets say i get from model every nth record, and another that does n-1?
public function getNewItem()//for main page grids
{
$criteria = new CDbCriteria;
$criteria->order = 'posted_date DESC';
$criteria->compare('product_status',"Y");
$criteria->compare('product_approval_status',"Y");
//????
return new CActiveDataProvider( $this, array(
'criteria'=>$criteria,
'pagination'=>false,
));
}

Answer 1

There are two ways to do this; depending on how complex your filtering needs to be;
First method you can modify your criteria compare to filter by only odd or even records like this
$criteria = new CDbCriteria;
$criteria->order = 'posted_date DESC';
$criteria->compare('product_status',"Y");
$criteria->compare('product_approval_status',"Y");
$criteria->addCondition('MOD(id,2)=1','AND');
or any such condition to get the corresponding subset of records
Second method is to filter it in the partial file you use in the CListView, I use this method to usually add additional code not for filtering, for example you want to add a new row every forth element, For this use the $indexand $widget variable made available in the itemView attribute in the CListView call with something like this.
<?php if(($index)%6 == 0 || $index == 0 ){ ?>
<div class="row">
<?php } ?>
// Regular view rendering code
// ...
<?php if(($index+1)%6 == 0 || ($index+1) == $widget->dataProvider->itemCount){ ?>
</div>
<?php }
Here I have used this to insert a new div for every 6 items in the list or if its the first/last item
This is useful for conditional rendering of items/ adding classes etc.